LTM4601HVIV#PBF资料

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FEATURES ■ ■ ■ ■ ■ ■ ■LTM4601HV12A 28VIN DC/DC µModule with PLL, Output Tracking and MarginingDESCRIPTIOThe LTM®4601HV is a complete 12A step-down switch mode DC/DC power supply with onboard switching con-troller, MOSFETs, inductor and all support components. The µModule is housed in a small surface mount 15mm ×15mm × 2.8mm LGA package. Operating over an input voltage range of 4.5 to 28V, the LTM4601HV supports an output voltage range of 0.6V to 5V as well as output voltage tracking and margining. The high efﬁ ciency design delivers 12A continuous current (14A peak). Only bulk input and output capacitors are needed to complete the design. The low proﬁ le (2.8mm) and light weight (1.7g) package easily mounts in unused space on the back side of PC boards for high density point of load regulation. The µModule can be synchronized with an external clock for reducing undesirable frequency harmonics and allows PolyPhase® operation for high load currents. A high switching frequency and adaptive on-time current mode architecture deliver a very fast transient response to line and load changes without sacriﬁ cing stability. An onboard differential remote sense ampliﬁ er can be used to accurately regulate an output voltage independent of load current. , LT, LTC, LTM and PolyPhase are registered trademarks of Linear Technology Corporation. µModule is a trademark of Linear Technology Corporation.All other trademarks are the property of their respective owners.Protected by U.S. Patents, including 5481178, 5847554, 6580258, 6304066, 765, 6774611, 6677210UAPPLICATIOS■Complete Switch Mode Power SupplyWide Input Voltage Range: 4.5V to 28V12A DC Typical, 14A Peak Output Current0.6V to 5V Output VoltageOutput Voltage Tracking and MarginingParallel Multiple µModulesTM for Current SharingDifferential Remote Sensing for Precision Regulation■ PLL Frequency Synchronization■ ±1.5% Regulation■ Current Foldback Protection (Disabled at Start-Up)■ Pb-Free (e4) RoHS Compliant Package with Gold Finish Pads■ Ultrafast Transient Response■ Current Mode Control■ Up to 95% Efﬁ ciency at 5VIN, 3.3VOUT■ Programmable Soft-Start■ Output Overvoltage Protection■ Small Footprint, Low Proﬁ le (15mm × 15mm × 2.8mm) Surface Mount LGA Package Telecom and Networking Equipment■ Servers■ Industrial Equipment■ Point of Load RegulationTYPICAL APPLICATIOVIN4.5V TO 28VVINPGOODON/OFFCINRUNCOMPINTVCCDRVCCMPGMSGND2.5V/12A Power Supply with 4.5V to 28V InputCLOCK SYNCTRACK/SS CONTROLPLLINTRACK/SSVOUTVFBMARG0MARG1VOUT_LCLDIFFVOUTVOSNS+VOSNS–fSETRSET19.1k4601HV TA01aEfﬁ ciency and Power Loss vs Load Current959085EFFICIENCY (%)12VIN524VINPOWER LOSS (W)EFFICIENCY4312VINPOWER LOSS1026100pFMARGINCONTROLVOUT2.5V12A807570656055504502LTM4601HVCOUTR1392k5% MARGINPGNDUU24VIN810LOAD CURRENT (A)12144601HV TA01b4601hvf1元器件交易网www.cecb2b.com

LTM4601HVABSOLUTE AXIU RATIGS(Note 1)WUPACKAGE/ORDER IFORATIOINTVCCPLLINTRACK/SSRUNCOMPMPGMfSETMARG0MARG1DRVCCVFBPGOODSGNDVOSNS+DIFFVOUTVOUT_LCLVOSNS–TOP VIEWUINTVCC, DRVCC, VOUT_LCL, VOUT (VOUT ≤ 3.3V with Remote Sense Amp) ....................................–0.3V to 6VPLLIN, TRACK/SS, MPGM, MARG0, MARG1, PGOOD, fSET ..............................–0.3V to INTVCC + 0.3VRUN .............................................................–0.3V to 5VVFB, COMP ................................................–0.3V to 2.7V VIN .............................................................–0.3V to 28VVOSNS+, VOSNS– .............................–0.3V to INTVCC – 1VOperating Temperature Range (Note 2) ...–40°C to 85°CJunction Temperature ...........................................125°CStorage Temperature Range ...................–55°C to 125°C● denotes the speciﬁ cations which apply over the –40°C to 85°C The ELECTRICAL CHARACTERISTICStemperature range, otherwise speciﬁ cations are at TA = 25°C, VIN = 12V. Per typical application (front page) conﬁ guration.SYMBOLVIN(DC)VOUT(DC)Input Speciﬁ cationsVIN(UVLO)IINRUSH(VIN)Undervoltage Lockout ThresholdInput Inrush Current at StartupIOUT = 0AIOUT = 0A. VOUT = 1.5V VIN = 5V VIN = 12VVIN = 12V, VOUT = 1.5V, No SwitchingVIN = 12V, VOUT = 1.5V, Switching ContinuousVIN = 5V, VOUT = 1.5V, No SwitchingVIN = 5V, VOUT = 1.5V, Switching ContinuousShutdown, RUN = 0, VIN = 12VVIN = 12V, VOUT = 1.5V, IOUT = 12AVIN = 12V, VOUT = 3.3V, IOUT = 12AVIN = 5V, VOUT = 1.5V, IOUT = 12ANo Load4.73.20.60.73.8382.542221.813.634.295PARAMETERInput DC VoltageOutput Voltage (With Remote Sense Amp)CIN = 10µF ×3, COUT = 200µF VIN = 12V, VOUT = 1.5V, IOUT = 0CONDITIONS●●IQ(VIN,NO LOAD)Input Supply Bias CurrentIS(VIN)Input Supply CurrentINTVCCVIN = 12V, RUN > 2V2UWWWVINPGNDVOUTLGA PACKAGE118-LEAD (15mm ´ 15mm ´ 2.8mm)TJMAX = 125°C, θJA = 15°C/W, θJC = 6°C/W,θJA DERIVED FROM 95mm × 76mm PCB WITH 4 LAYERSWEIGHT = 1.7gORDER PART NUMBERLTM4601HVEV#PBFLTM4601HVIV#PBFLGA PART MARKING*LTM4601HVVLTM4601HVVConsult LTC Marketing for parts speciﬁ ed with wider operating temperature ranges. *The temperature grade is identiﬁ ed by a label on the shipping container.MIN4.51.478TYPMAX28UNITSVVVAAmAmAmAmAµAAAA1.51.52245.3V4601hvf元器件交易网www.cecb2b.com

LTM4601HV The ● denotes the speciﬁ cations which apply over the –40°C to 85°C ELECTRICAL CHARACTERISTICS

guration.temperature range, otherwise speciﬁ cations are at TA = 25°C, VIN = 12V. Per typical application (front page) conﬁSYMBOLIOUTDCΔVOUT(LINE) VOUT ΔVOUT(0-12A) VOUTVOUT(AC)PARAMETERCONDITIONSMIN0TYPOutput Speciﬁ cationsOutput Continuous Current RangeVIN = 12V, VOUT = 1.5V(See Output Current Derating Curves for Different VIN, VOUT and TA)Line Regulation AccuracyLoad Regulation AccuracyVOUT = 1.5V, IOUT = 0A, VIN = 4.5V – 28VVOUT = 1.5V, IOUT = 0A to 12A, with RSA VIN = 5V VIN = 12VIOUT = 0A, COUT = 2×, 100µF/X5R/Ceramic VIN = 12V, VOUT = 1.5V VIN = 5V, VOUT = 1.5VIOUT = 5A, VIN = 12V, VOUT = 1.5VCOUT = 200µF, VOUT = 1.5V, IOUT = 0A VIN = 12V VIN = 5VCOUT = 200µF, VOUT = 1.5V, IOUT = 1A Resisitive Load VIN = 12V VIN = 5VLoad: 0% to 50% to 0% of Full Load, COUT = 2 × 22µF/Ceramic, 470µF, 4V Sanyo POSCAP VIN = 12V VIN = 5V●MAX12UNITSA0.3%●●0.250.2520188502020%%mVP-PmVP-PkHzmVmVOutput Ripple VoltagefSΔVOUT(START)Output Ripple Voltage FrequencyTurn-On Overshoot, TRACK/SS = 10nFTurn-On Time, TRACK/SS = OpentSTART0.50.7msmsΔVOUTLSPeak Deviation for Dynamic Load353525171700132INTVCC – 1INTVCC1.25mVmVµsAAVVmVV/VMHzV/µskΩdB0.6061.9–2.0100VVµAnstSETTLEIOUTPKSettling Time for Dynamic Load StepLoad: 0% to 50%, or 50% to 0% of Full Load VIN = 12VOutput Current LimitCOUT = 200µF, Table 2 VIN = 12V, VOUT = 1.5V VIN = 5V, VOUT = 1.5VRemote Sense Amp (Note 3) VOSNS+, VOSNS– CM RangeDIFFVOUT RangeVOSAVGBPSRRINCMRRControl StageVFBVRUNISS/TRACKtON(MIN)Error Ampliﬁ er Input Voltage AccuracyRUN Pin On/Off ThresholdSoft-Start Charging CurrentMinimum On TimeVSS/TRACK = 0V(Note 4)IOUT = 0A, VOUT = 1.5V●Common Mode Input Voltage RangeVIN = 12V, RUN > 2VOutput Voltage RangeInput Offset Voltage MagnitudeDifferential GainGain Bandwidth ProductSlew RateInput ResistanceCommon Mode Rejection ModeVOSNS+ to GNDVIN = 12V, DIFF OUT Load = 100k201000.5941–1.00.61.5–1.5504601hvf

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LTM4601HVtemperature range, otherwise speciﬁ cations are at TA = 25°C, VIN = 12V. Per typical application (front page) conﬁ guration.SYMBOLtOFF(MIN)RPLLINIDRVCCRFBHIVMPGMVMARG0, VMARG1PGOOD OutputΔVFBHΔVFBLΔVFB(HYS)PGOOD Upper ThresholdPGOOD Lower ThresholdPGOOD HysteresisVFB RisingVFB FallingVFB Returning7–710–101.5Note 2: The LTM4601HVE is guaranteed to meet performance speciﬁ cations from 0°C to 85°C. Speciﬁ cations over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. The LTM4601HVI is guaranteed and tested over the –40°C to 85°C temperature range.Note 3: Remote sense ampliﬁ er recommended for ≤3.3V output.Note 4: 100% tested at wafer level only.13–13%%%PARAMETERMinimum Off TimePLLIN Input ResistanceCurrent into DRVCC PinResistor Between VOUT and VFBMargin Reference Voltage MARG0, MARG1 Voltage ThresholdsVOUT = 1.5V, IOUT = 1A, Frequency = 850kHz, DRVCC = 5V60.098CONDITIONS(Note 4)MINTYP250501860.41.181.42560.702 The ● denotes the speciﬁ cations which apply over the –40°C to 85°C ELECTRICAL CHARACTERISTICS

MAX400UNITSnskΩmAkΩVVNote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime.4601hvf

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LTM4601HVTYPICAL PERFOR A CE CHARACTERISTICS(See Figures 19 and 20 for all curves)Efﬁ ciency vs Load Current with 5VIN1009590EFFICIENCY (%)EFFICIENCY (%)85807570656000.6VOUT1.2VOUT1.5VOUT2.5VOUT3.3VOUT510154601HV G018075706560555000.6VOUT1.2VOUT1.5VOUT2.5VOUT3.3VOUT5VOUT105LOAD CURRENT (A)154601HV G02EFFICIENCY (%)LOAD CURRENT (A)1.2V Transient Response VOUT50mV/DIVIOUT5A/DIVVOUT50mV/DIV20µs/DIV1.2V AT 6A/µs LOAD STEPCOUT = 3 • 22µF 6.3V CERAMICS470µF 4V SANYO POSCAPC3 = 100pF2.5V Transient ResponseVOUT50mV/DIVVOUT50mV/DIVIOUT5A/DIV20µs/DIV2.5V AT 6A/µs LOAD STEPCOUT = 3 • 22µF 6.3V CERAMICS470µF 4V SANYO POSCAPC3 = 100pFUWEfﬁ ciency vs Load Current with 12VIN1009590859590858075706560555045Efﬁ ciency vs Load Current with 24VIN 1.5VOUT2.5VOUT3.3VOUT5.0VOUT0105LOAD CURRENT (A)154601HV G031.5V Transient ResponseVOUT50mV/DIV1.8V Transient ResponseIOUT5A/DIVIOUT5A/DIV4601HV G0420µs/DIV1.5V AT 6A/µs LOAD STEPCOUT = 3 • 22µF 6.3V CERAMICS470µF 4V SANYO POSCAPC3 = 100pF4601HV G0520µs/DIV1.8V AT 6A/µs LOAD STEPCOUT = 3 • 22µF 6.3V CERAMICS470µF 4V SANYO POSCAPC3 = 100pF4601HV G063.3V Transient ResponseIOUT5A/DIV4601HV G0720µs/DIV3.3V AT 6A/µs LOAD STEPCOUT = 3 • 22µF 6.3V CERAMICS470µF 4V SANYO POSCAPC3 = 100pF4601 G084601hvf5元器件交易网www.cecb2b.com

LTM4601HVTYPICAL PERFOR A CE CHARACTERISTICS(See Figures 19 and 20 for all curves)Start-Up, IOUT = 0AVOUT0.5V/DIV

VOUT0.5V/DIVIIN1A/DIV

IIN0.5A/DIV

VIN = 12VVOUT = 1.5VCOUT = 470µF3 × 22µF

SOFT-START = 10nF

VIN to VOUT Step-Down Ratio5.55.04.5OUTPUT VOLTAGE (V)4.03.53.02.52.01.51.00.500

81012141618202224INPUT VOLTAGE (V)

4601HV G11

Short-Circuit Protection, IOUT = 0AVOUT0.5V/DIVIIN1A/DIV

VOUT0.5V/DIVIIN1A/DIV

50µs/DIVVIN = 12V

VOUT = 1.5VCOUT = 470µF3 × 22µF

SOFT-START = 10nF

UWStart-Up, IOUT = 12A (Resistive Load)5ms/DIV

4601HV G09

2ms/DIV

VIN = 12VVOUT = 1.5VCOUT = 470µF3 × 22µF

SOFT-START = 10nF

4601HV G10

Track, IOUT = 12A3.3V OUTPUT WITH 130k FROM VOUT TO ION

5V OUTPUT WITH 100k RESISTOR ADDED FROM fSET TO GND

5V OUTPUT WITH NO RESISTOR ADDED FROM fSET TO GND2.5V OUTPUT1.8V OUTPUT1.5V OUTPUT1.2V OUTPUT

TRACK/SS0.5V/DIV

VFB0.5V/DIVVOUT1V/DIV

2ms/DIV

VIN = 12VVOUT = 1.5VCOUT = 470µF3 × 22µF

SOFT-START = 10nF

4601HV G12

Short-Circuit Protection, IOUT = 12A4601HV G13

50µs/DIVVIN = 12V

VOUT = 1.5VCOUT = 470µF3 × 22µF

SOFT-START = 10nF

4601HV G14

4601hvf

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LTM4601HVPI FUCTIOSVIN (Bank 1): Power Input Pins. Apply input voltage be-tween these pins and PGND pins. Recommend placing input decoupling capacitance directly between VIN pins and PGND pins.VOUT (Bank 3): Power Output Pins. Apply output load between these pins and PGND pins. Recommend placing output decoupling capacitance directly between these pins and PGND pins. Review the ﬁ gure below.PGND (Bank 2): Power ground pins for both input and output returns. er. VOSNS– (Pin M12): (–) Input to the Remote Sense AmpliﬁThis pin connects to the ground remote sense point. The remote sense ampliﬁ er is used for VOUT ≤3.3V. This pin connects to the output remote sense point. The remote sense ampliﬁ er is used for VOUT ≤3.3V.DIFFVOUT (Pin K12): Output of the Remote Sense Ampli-ﬁ er. This pin connects to the VOUT_LCL pin.DRVCC (Pin E12): This pin normally connects to INTVCC for powering the internal MOSFET drivers. This pin can be biased up to 6V from an external supply with about 50mA capability, or an external circuit shown in Figure 18. This improves efﬁ ciency at the higher input voltages by reducing power dissipation in the module.INTVCC (Pin A7): This pin is for additional decoupling of the 5V internal regulator. VOSNS+ (Pin J12): (+) Input to the Remote Sense Ampliﬁ er. AVINBBANK 1CDEPGNDFBANK 2GHJVOUTKBANK 3LM1234567101112INTVCCPLLINTRACK/SSRUNCOMPMPGMfSETMARG0MARG1DRVCCVFBPGOODSGNDVOSNS+DIFFVOUTVOUT_LCLVOSNS–4601hvfUUU(See Package Description for Pin Assignment)PLLIN (Pin A8): External Clock Synchronization Input to the Phase Detector. This pin is internally terminated to SGND with a 50k resistor. Apply a clock above 2V and below INTVCC. See Applications Information.TRACK/SS (Pin A9): Output Voltage Tracking and Soft- Start Pin. When the module is conﬁ gured as a master output, then a soft-start capacitor is placed on this pin to ground to control the master ramp rate. A soft-start capacitor can be used for soft-start turn on as a stand alone regulator. Slave operation is performed by putting a resistor divider from the master output to the ground, and connecting the center point of the divider to this pin. See Applications Information.MPGM (Pin A12): Programmable Margining Input. A re-sistor from this pin to ground sets a current that is equal to 1.18V/R. This current multiplied by 10kΩ will equal a value in millivolts that is a percentage of the 0.6V refer-ence voltage. See Applications Information. To parallel LTM4601HVs, each requires an individual MPGM resistor. Do not tie MPGM pins together.fSET (Pin B12): Frequency Set Internally to 850kHz. An external resistor can be placed from this pin to ground to increase frequency. This pin can be decoupled with a 1000pF capacitor. See Applications Information for fre-quency adjustment. er. VFB (Pin F12): The Negative Input of the Error AmpliﬁInternally, this pin is connected to VOUT_LCL pin with a 60.4k precision resistor. Different output voltages can be programmed with an additional resistor between VFB and SGND pins. See Applications Information.TOP VIEW7元器件交易网www.cecb2b.com

LTM4601HVPI FUCTIOSMARG0 (Pin C12): This pin is the LSB logic input for the margining function. Together with the MARG1 pin will determine if margin high, margin low or no margin state is applied. The pin has an internal pull-down resistor of 50k. See Applications Information.MARG1 (Pin D12): This pin is the MSB logic input for the margining function. Together with the MARG0 pin will determine if margin high, margin low or no margin state is applied. The pin has an internal pull-down resistor of 50k. See Applications Information.SGND (Pin H12): Signal Ground. This pin connects to PGND at output capacitor point. COMP (Pin A11): Current Control Threshold and Error Ampliﬁ er Compensation Point. The current comparator threshold increases with this control voltage. The voltage SI PLIFIEDBLOCK DIAGRA VOUT_LCL>2V = ON<0.9V = OFFMAX = 5V1MRUN5.1VZENER60.4kINTERNALCOMPSGNDMARG1MARG0VFBRSET19.1kfSET39.2kINTVCC10k10k10kDIFFVOUTVOSNS–VOSNS+50k50kQ2COUTPGND22µFPOWER CONTROLQ1VOUT2.5V12A1.5µFVIN4.5V TO 28VCINVOUTPGOODCOMPMPGMTRACK/SSCSS4.7µFINTVCCDRVCC50kFigure 1. Simpliﬁ ed LTM4601HV Block Diagram4601hvf8+–PLLINWUUWU(See Package Description for Pin Assignment)ranges from 0V to 2.4V with 0.7V corresponding to zero sense voltage (zero current). PGOOD (Pin G12): Output Voltage Power Good Indicator. Open-drain logic output that is pulled to ground when the output voltage is not within ±10% of the regulation point, after a 25µs power bad mask timer expires.RUN (Pin A10): Run Control Pin. A voltage above 1.9V will turn on the module, and when below 1.9V, will turn off the module. A programmable UVLO function can be accomplished with a resistor from VIN to this pin that is has a 5.1V zener to ground. Maximum pin voltage is 5V. Limit current into the RUN pin to less than 1mA.VOUT_LCL (Pin L12): VOUT connects directly to this pin to bypass the remote sense ampliﬁ er, or DIFFVOUT connects to this pin when remote sense ampliﬁ er is used. ++10k4601HV F01元器件交易网www.cecb2b.com

LTM4601HVDECOUPLI G REQUIRE E TS SYMBOLCINCOUTPARAMETERExternal Input Capacitor Requirement (VIN = 4.5V to 28V, VOUT = 2.5V)External Output Capacitor Requirement (VIN = 4.5V to 28V, VOUT = 2.5V)U

OPERATIO

Power Module DescriptionThe LTM4601HV is a standalone nonisolated switching mode DC/DC power supply. It can deliver up to 12A of DC output current with some external input and output capacitors. This module provides precisely regulated output voltage programmable via one external resistor from 0.6VDC to 5.0VDC over a 4.5V to 28V wide input voltage. The typical application schematics are shown in Figures 19 and 20. The LTM4601HV has an integrated constant on-time current mode regulator, ultralow RDS(ON) FETs with fast switching speed and integrated Schottky diodes. The typical switching frequency is 850kHz at full load. With current mode control and internal feedback loop compensation, the LTM4601HV module has sufﬁ cient stability margins and good transient performance under a wide range of operating conditions and with a wide range of output capacitors, even all ceramic output capacitors. Current mode control provides cycle-by-cycle fast current limit. Besides, foldback current limiting is provided in an overcurrent condition while VFB drops. Internal overvoltage and undervoltage comparators pull the open-drain PGOOD output low if the output feedback voltage exits a ±10% window around the regulation point. Furthermore, in an overvoltage condition, internal top FET Q1 is turned off and bottom FET Q2 is turned on and held on until the overvoltage condition clears. Pulling the RUN pin below 1V forces the controller into its shutdown state, turning off both Q1 and Q2. At low load current, the module works in continuous current mode by default to achieve minimum output voltage ripple. When DRVCC pin is connected to INTVCC an integrated 5V linear regulator powers the internal gate drivers. If a 5V external bias supply is applied on the DRVCC pin, then an efﬁ ciency improvement will occur due to the reduced power loss in the internal linear regulator. This is especially true at the higher input voltage range.The LTM4601HV has a very accurate differential remote sense ampliﬁ er with very low offset. This provides for very accurate remote sense voltage measurement. The MPGM pin, MARG0 pin and MARG1 pin are used to sup-port voltage margining, where the percentage of margin is programmed by the MPGM pin, and the MARG0 and MARG1 select margining.The PLLIN pin provides frequency synchronization of the device to an external clock. The TRACK/SS pin is used for power supply tracking and soft-start programming.UWUTA = 25°C, VIN = 12V. Use Figure 1 conﬁ guration.MIN20100TYP30200MAXUNITSµFµFCONDITIONSIOUT = 12A, 3× 10µF CeramicsIOUT = 12A4601hvf

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LTM4601HVAPPLICATIOS IFORATIO

The typical LTM4601HV application circuits are shown in Figures 19 and 20. External component selection is primar-ily determined by the maximum load current and output voltage. Refer to Table 2 for speciﬁ c external capacitor requirements for a particular application.VIN to VOUT Step-Down RatiosThere are restrictions in the maximum VIN and VOUT step down ratio that can be achieved for a given input voltage. These constraints are shown in the Typical Performance Characteristics curves labeled VIN to VOUT Step-Down Ratio. Note that additional thermal derating may apply. See the Thermal Considerations and Output Current Derating section of this data sheet.Output Voltage Programming and MarginingThe PWM controller has an internal 0.6V reference voltage. As shown in the Block Diagram, a 1M and a 60.4k 0.5% internal feedback resistor connects VOUT and VFB pins together. The VOUT_LCL pin is connected between the 1M and the 60.4k resistor. The 1M resistor is used to protect against an output overvoltage condition if the VOUT_LCL pin is not connected to the output, or if the remote sense ampliﬁ er output is not connected to VOUT_LCL. The output voltage will default to 0.6V. Adding a resistor RSET from the VFB pin to SGND pin programs the output voltage:VOUT=0.6V

60.4k+RSETRSET

Table 1. Standard 1% Resistor ValuesRSET(kΩ)VOUT (V)Open0.660.41.240.21.530.11.825.5219.12.513.33.38.25510

UThe MPGM pin programs a current that when multiplied by an internal 10k resistor sets up the 0.6V reference ± offset for margining. A 1.18V reference divided by the RPGM resistor on the MPGM pin programs the current. Calculate VOUT(MARGIN):VOUT(MARGIN)=

%VOUT

•VOUT100 where %VOUT is the percentage of VOUT you want to margin, and VOUT(MARGIN) is the margin quantity in volts: RPGM=

VOUT1.18V

••10k0.6VVOUT(MARGIN)

where RPGM is the resistor value to place on the MPGM pin to ground.The output margining will be ± margining of the value. This is controlled by the MARG0 and MARG1 pins. See the truth table below:MARG0LOWLOWHIGHHIGHMARG1 LOWLOWHIGHMODENO MARGINMARGIN DOWNNO MARGINHIGH MARGIN UPWUUInput CapacitorsLTM4601HV module should be connected to a low AC impedance DC source. Input capacitors are required to be placed adjacent to the module. In Figure 18, the 10µF ceramic input capacitors are selected for their ability to handle the large RMS current into the converter. An input bulk capacitor of 100µF is optional. This 100µF capacitor is only needed if the input source impedance is compromised by long inductive leads or traces. 4601hvf

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LTM4601HVAPPLICATIOS IFORATIOVOUTVINFor a buck converter, the switching duty-cycle can be estimated as: D=Without considering the inductor current ripple, the RMS current of the input capacitor can be estimated as: ICIN(RMS)=IOUT(MAX)η%•D•(1–D)In the above equation, η% is the estimated efﬁ ciency of the power module. CIN can be a switcher-rated electrolytic aluminum capacitor, OS-CON capacitor or high volume ceramic capacitor. Note the capacitor ripple current rat-ings are often based on temperature and hours of life. This makes it advisable to properly derate the input capacitor, or choose a capacitor rated at a higher temperature than required. Always contact the capacitor manufacturer for derating requirements. In Figure 18, the 10µF ceramic capacitors are together used as a high frequency input decoupling capacitor. In a typical 12A output application, three very low ESR, X5R or X7R, 10µF ceramic capacitors are recommended. These decoupling capacitors should be placed directly adjacent to the module input pins in the PCB layout to minimize the trace inductance and high frequency AC noise. Each 10µF ceramic is typically good for 2A to 3A of RMS ripple current. Refer to your ceramics capacitor catalog for the RMS current ratings.Multiphase operation with multiple LTM4601HV devices in parallel will lower the effective input RMS ripple current due to the interleaving operation of the regulators. Application Note 77 provides a detailed explanation. Refer to Figure 2 for the input capacitor ripple current requirement as a function of the number of phases. The ﬁ gure provides a ratio of RMS ripple current to DC load current as function of duty cycle and the number of paralleled phases. Pick RMS INPUT RIPPLE CURRENTDC LOAD CURRENTUthe corresponding duty cycle and the number of phases to arrive at the correct ripple current value. For example, the 2-phase parallel LTM4601HV design provides 24A at 2.5V output from a 12V input. The duty cycle is DC = 2.5V/12V = 0.21. The 2-phase curve has a ratio of ~0.25 for a duty cycle of 0.21. This 0.25 ratio of RMS ripple current to a DC load current of 24A equals ~6A of input RMS ripple current for the external input capacitors. Output CapacitorsThe LTM4601HV is designed for low output voltage ripple. The bulk output capacitors deﬁ ned as COUT are chosen with low enough effective series resistance (ESR) to meet the output voltage ripple and transient requirements. COUT can be a low ESR tantalum capacitor, a low ESR polymer capacitor or a ceramic capacitor. The typical capacitance is 200µF if all ceramic output capacitors are used. Additional output ﬁ ltering may be required by the system designer, if further reduction of output ripple or dynamic transient spike is required. Table 2 shows a matrix of different output voltages and output capacitors to minimize the voltage droop and overshoot during a 5A/µs transient. The table optimizes total equivalent ESR and total bulk capacitance to maximize transient performance. 0.60.50.40.30.20.101-PHASE2-PHASE3-PHASE4-PHASE6-PHASE12-PHASE0.10.20.30.40.50.60.7DUTY FACTOR (VOUT/VIN)0.80.94601HV F02WUUFigure 2. Normalized Input RMS Ripple Current vs Duty Factor for One to Six Modules (Phases)4601hvf11元器件交易网www.cecb2b.com

LTM4601HVAPPLICATIOS IFORATIOMultiphase operation with multiple LTM4601HV devices in parallel will lower the effective output ripple current due to the interleaving operation of the regulators. For example, each LTM4601HV’s inductor current of a 12V to 2.5V multiphase design can be read from the Inductor Ripple Current versus Duty Cycle graph (Figure 3). The large ripple current at low duty cycle and high output voltage 122.5V OUTPUT108IL (A)205V OUTPUT1.8V OUTPUT1.5V OUTPUT1.2V OUTPUT3.3V OUTPUT WITH 130k ADDED FROM VOUT TO fSET5V OUTPUT WITH 100k ADDED FROM fSET TO GND0204060DUTY CYCLE (VOUT/VIN)804601HV F03Figure 3. Inductor Ripple Current vs Duty Cycle1.000.950.900.850.80PEAK-TO-PEAK OUTPUT RIPPLE CURRENTDIr0.750.700.650.600.550.500.450.400.350.300.250.200.150.100.050RATIO =0.10.150.20.250.30.350.40.450.50.550.60.650.70.750.80.850.9DUTY CYCLE (VO/VIN)4601HV F04Figure 4. Normalized Output Ripple Current vs Duty Cycle, Dlr = VOT/LI, Dlr = Each Phase’s Inductor Current 12Ucan be reduced by adding an external resistor from fSET to ground which increases the frequency. If the duty cycle is DC = 2.5V/12V = 0.21, the inductor ripple current for 2.5V output at 21% duty cycle is ~6A in Figure 3. Figure 4 provides a ratio of peak-to-peak output ripple cur-rent to the inductor current as a function of duty cycle and the number of paralleled phases. Pick the corresponding duty cycle and the number of phases to arrive at the correct output ripple current ratio value. If a 2-phase operation is chosen at a duty cycle of 21%, then 0.6 is the ratio. This 0.6 ratio of output ripple current to inductor ripple of 6A equals 3.6A of effective output ripple current. Refer to Ap-plication Note 77 for a detailed explanation of output ripple current reduction as a function of paralleled phases.The output voltage ripple has two components that are related to the amount of bulk capacitance and effective series resistance (ESR) of the output bulk capacitance. Therefore, the output voltage ripple can be calculated with the known effective output ripple current. The equation: ΔVOUT(P-P) ≈ (ΔIL/(8 • f • m • COUT) + ESR • ΔIL), where 1-PHASE2-PHASE3-PHASE4-PHASE6-PHASE4601hvfWUU元器件交易网www.cecb2b.com

LTM4601HVAPPLICATIOS IFORATIOf is frequency and m is the number of parallel phases. This calculation process can be easily fulﬁ lled using our Excel tool (Refer to the Linear Technology µModule Power Design Tool).Fault Conditions: Current Limit and Overcurrent FoldbackLTM4601HV has a current mode controller, which inher-ently limits the cycle-by-cycle inductor current not only in steady-state operation, but also in transient. To further limit current in the event of an overload condition, the LTM4601HV provides foldback current limiting. If the output voltage falls by more than 50%, then the maximum output current is progressively lowered to about one sixth of its full current limit value. Soft-Start and TrackingThe TRACK/SS pin provides a means to either soft-start the regulator or track it to a different power supply. A capacitor on this pin will program the ramp rate of the output voltage. A 1.5µA current source will charge up the external soft-start capacitor to 80% of the 0.6V internal voltage reference minus any margin delta. This will control the ramp of the internal reference and the output voltage. The total soft-start time can be calculated as: tSOFTSTART=0.8V•0.6V–VOUT(MARGIN)•CIN()When the RUN pin falls below 1.5V, then the SS pin is reset to allow for proper soft-start control when the regulator is enabled again. Current foldback and force continuous mode are disabled during the soft-start process. The soft-start function can also be used to control the output ramp up time, so that another regulator can be easily tracked to it.Output Voltage Tracking Output voltage tracking can be programmed externally using the TRACK/SS pin. The output can be tracked up and Udown with another regulator. The master regulator’s output is divided down with an external resistor divider that is the same as the slave regulator’s feedback divider. Figure 5 shows an example of coincident tracking. Ratiometric modes of tracking can be achieved by selecting different resistor values to change the output tracking ratio. The master output must be greater than the slave output for the tracking to work. Figure 6 shows the coincident output tracking characteristics.MASTEROUTPUTTRACK CONTROLR260.4kR140.2kSLAVE OUTPUTCOUTVIN100kVINPGOODMPGMRUNCOMPINTVCCDRVCCPLLINTRACK/SSVOUTVFBMARG0MARG1VOUT_LCLDIFFVOUTVOSNS+VOSNS–fSETRSET40.2k4601HV F05WUU60.4k FROM VOUT TO VFBLTM4601HVSGNDPGNDFigure 5CSS1.5µAMASTER OUTPUTSLAVE OUTPUTOUTPUTVOLTAGETIME4601HV F06Figure 601hvf13元器件交易网www.cecb2b.com

LTM4601HVAPPLICATIOS IFORATIO

Run EnableThe RUN pin is used to enable the power module. The pin has an internal 5.1V zener to ground. The pin can be driven with a logic input not to exceed 5V. The RUN pin can also be used as an undervoltage lock out (UVLO) function by connecting a resistor divider from the input supply to the RUN pin: VUVLO=

R1+R2

•1.5VR2 Power GoodThe PGOOD pin is an open-drain pin that can be used to monitor valid output voltage regulation. This pin monitors a ±10% window around the regulation point and tracks with margining.COMP PinThis pin is the external compensation pin. The module has already been internally compensated for most output voltages. Table 2 is provided for most application require-ments. A spice model will be provided for other control loop optimization.PLLINThe power module has a phase-locked loop comprised of an internal voltage controlled oscillator and a phase detector. This allows the internal top MOSFET turn-on to be locked to the rising edge of the external clock. The frequency range is ±30% around the operating frequency of 850kHz. A pulse detection circuit is used to detect a clock on the PLLIN pin to turn on the phase lock loop. The pulse width of the clock has to be at least 400ns and 2V in amplitude. During the start-up of the regulator, the phase-lock loop function is disabled.INTVCC and DRVCC ConnectionAn internal low dropout regulator produces an internal 5V supply that powers the control circuitry and DRVCC for driving the internal power MOSFETs. Therefore, if the system does not have a 5V power rail, the LTM4601HV can be directly powered by VIN. The gate driver current 14

Uthrough the LDO is about 20mA. The internal LDO power dissipation can be calculated as: PLDO_LOSS = 20mA • (VIN – 5V)The LTM4601HV also provides the external gate driver voltage pin DRVCC. If there is a 5V rail in the system, it is recommended to connect DRVCC pin to the external 5V rail. This is especially true for higher input voltages. Do not apply more than 6V to the DRVCC pin. A 5V output can be used to power the DRVCC pin with an external circuit as shown in Figure 18.Parallel Operation of the ModuleThe LTM4601HV device is an inherently current mode controlled device. Parallel modules will have very good current sharing. This will balance the thermals on the de-sign. Figure 21 shows a schematic of the parallel design. The voltage feedback equation changes with the variable n as modules are paralleled: 60.4k

+RFBnVOUT=0.6V

RFB n is the number of paralleled modules.Figure 21 shows two LTM4601HV modules used in a par-allel design. An LTM4601HV device can be used without the diff amp. Thermal Considerations and Output Current DeratingThe power loss curves in Figures 7 and 8 can be used in coordination with the load current derating curves in Figures 9 to 16 for calculating an approximate θJA for the module with various heat sinking methods. Thermal models are derived from several temperature measurements at the bench and thermal modeling analysis. Thermal Ap-plication Note 103 provides a detailed explanation of the analysis for the thermal models and the derating curves. Tables 3 and 4 provide a summary of the equivalent θJA for the noted conditions. These equivalent θJA parameters are correlated to the measured values, and are improved with air ﬂ ow. The case temperature is maintained at 100°C or below for the derating curves. The maximum case temperature of 100°C is to allow for a rise of about 13°C 4601hvf

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LTM4601HVAPPLICATIOS IFORATIO5.04.54.0POWER LOSS (W)POWER LOSS (W)3.53.02.52.01.51.00.5002684OUTPUT CURRENT (A)1012002468OUTPUT CURRENT (A)10125V LOSS124V LOSS12V LOSS5424V LOSS312V LOSS24601HV F07Figure 7. 24VIN and 1.5V Power Loss12MAXIMUM LOAD CURRENT (A)108205VIN, 1.5VOUT 0LFM5VIN, 1.5VOUT 200LFM5VIN, 1.5VOUT 400LFM5060708090AMBIENT TEMPERATURE (°C)1004601HV F09MAXIMUM LOAD CURRENT (A)Figure 9. No Heat Sink 5VIN12MAXIMUM LOAD CURRENT (A)1082012VIN, 1.5VOUT 0LFM12VIN, 1.5VOUT 200LFM12VIN, 1.5VOUT 400LFM5060708090AMBIENT TEMPERATURE (°C)1004601HV F11MAXIMUM LOAD CURRENT (A)Figure 11. No Heat Sink 12VINU601HV F08WUUFigure 8. 24VIN and 3.3V Power Loss12108205VIN, 1.5VOUT 0LFM5VIN, 1.5VOUT 200LFM5VIN, 1.5VOUT 400LFM5060708090AMBIENT TEMPERATURE (°C)1004601HV F10Figure 10. BGA Heat Sink 5VIN121082012VIN, 1.5VOUT 0LFM12VIN, 1.5VOUT 200LFM12VIN, 1.5VOUT 400LFM5060708090AMBIENT TEMPERATURE (°C)1004601HV F12Figure 12. BGA Heat Sink 12VIN4601hvf15元器件交易网www.cecb2b.com

LTM4601HVAPPLICATIOS IFORATIO12108200LFM200LFM400LFM406080AMBIENT TEMPERATURE (°C)1004601HV F13MAXIMUM LOAD CURRENT (A)MAXIMUM LOAD CURRENT (A)Figure 13. 12VIN, 3.3VOUT, No Heat Sink12MAXIMUM LOAD CURRENT (A)1082024VIN, 1.5VOUT 0LFM24VIN, 1.5VOUT 200LFM24VIN, 1.5VOUT 400LFM406080AMBIENT TEMPERATURE (°C)1004601HV F15MAXIMUM LOAD CURRENT (A)Figure 15. 24VIN, 1.5VOUT, No Heat Sink16U12108200LFM200LFM400LFM406080AMBIENT TEMPERATURE (°C)1004601HV F14WUUFigure 14. 12VIN, 3.3VOUT, BGA Heat Sink121082024VIN, 1.5VOUT 0LFM24VIN, 1.5VOUT 200LFM24VIN, 1.5VOUT 400LFM406080AMBIENT TEMPERATURE (°C)1004601HV F16Figure 16. 24VIN, 1.5VOUT, BGA Heat Sink4601hvf元器件交易网www.cecb2b.com

LTM4601HVAPPLICATIOS IFORATIO

TYPICAL MEASURED VALUESCOUT1 VENDORSTDKTAIYO YUDENTAIYO YUDENVOUT(V)1.21.21.21.21.21.21.21.21.51.51.51.51.51.51.51.51.81.81.81.81.81.81.81.82.52.52.52.52.52.52.52.53.33.33.33.33.33.33.33.355CIN(CERAMIC)2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35V2 × 10µF 35VTable 2. Output Voltage Response Versus Component Matrix (Refer to Figure 20), 0A to 6A Load StepPART NUMBERC4532X5R0J107MZ (100UF,6.3V)JMK432BJ107MU-T ( 100µF, 6.3V)JMK316BJ226ML-T501 ( 22µF, 6.3V)COUT1(CERAMIC)3 × 22µF 6.3V1 × 100µF 6.3V2 × 100µF 6.3V4 × 100µF 6.3V3 × 22µF 6.3V1 × 100µF 6.3V2 × 100µF 6.3V4 × 100µF 6.3V3 × 22µF 6.3V1 × 100µF 6.3V2 × 100µF 6.3V4 × 100µF 6.3V3 × 22µF 6.3V1 × 100µF 6.3V2 × 100µF 6.3V4 × 100µF 6.3V3 × 22µF 6.3V1 × 100µF 6.3V2 × 100µF 6.3V4 × 100µF 6.3V3 × 22µF 6.3V1 × 100µF 6.3V2 × 100µF 6.3V4 × 100µF 6.3V1 × 100µF 6.3V2 × 100µF 6.3V3 × 22µF 6.3V4 × 100µF 6.3V1 × 100µF 6.3V3 × 22µF 6.3V2 × 100µF 6.3V4 × 100µF 6.3V2 × 100µF 6.3V1 × 100µF 6.3V3 × 22µF 6.3V4 × 100µF 6.3V1 × 100µF 6.3V3 × 22µF 6.3V2 × 100µF 6.3V4 × 100µF 6.3V4 × 100µF 6.3V4 × 100µF 6.3VCOUT2(BULK)470µF 4V470µF 2.5V330µF 6.3VNONE470µF 4V470µF 2.5V330µF 6.3VNONE470µF 4V470µF 2.5V330µF 6.3VNONE470µF 4V470µF 2.5V330µF 6.3VNONE470µF 4V470µF 2.5V330µF 6.3VNONE470µF 4V470µF 2.5V330µF 6.3VNONE470µF 4V330µF 6.3V470µF 4VNONE470µF 4V470µF 4V330µF 6.3VNONE330µF 6.3V470µF 4V470µF 4VNONE470µF 4V470µF 4V330µF 6.3VNONENONENONECOUT2 VENDORSSANYO POSCAPSANYO POSCAPSANYO POSCAPVIN(V)5555121212125555121212125555121212125555121212127777121212121520DROOP(mV)7035704070357049485444614854445448446865606068654856576048515670120110110114110110110114188159PART NUMBER6TPE330MIL (330µF, 6.3V)2R5TPE470M9 (470µF, 2.5V)4TPE470MCL (470µF, 4V)PEAK TO PEAK (mV)140701409314070140981001098411810010910810090140130120120140130103113116115103102113140240214214230214214214230 375320RECOVERY TIME (µs)302020303020202035303030353025253020303030303020303030253030302530303030303535302525LOAD STEP(A/µs)666666666666666666666666666666666666666666RSET(kΩ)60.460.460.460.460.460.460.460.440.240.240.240.240.240.240.240.230.130.130.130.130.130.130.130.119.119.119.119.119.119.119.119.113.313.313.313.313.313.313.313.38.258.25CIN(BULK)150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35V150µF 35VUCCOMPNONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONENONEC347pF100pF22pF100pF100pF100pF22pF100pF100pF33pF100pF100pF100pF33pF100pF100pF47pF100pF100pF100pF100pF100pF100pF100pF100pF220pFNONE100pF100pFNONE220pF220pF100pF100pF100pF100pF100pF150pF100pF100pF22pF22pF4601hvf

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LTM4601HVAPPLICATIOS IFORATIO

Table 3. 1.5V Output at 12ADERATING CURVEFigures 9, 11, 15Figures 9, 11, 15Figures 9, 11, 15Figures 10, 12, 16Figures 10, 12, 16Figures 10, 12, 16VIN (V)5, 12, 245, 12, 245, 12, 245, 12, 245, 12, 245, 12, 24POWER LOSS CURVEFigure 7Figure 7Figure 7Figure 7Figure 7Figure 7AIR FLOW (LFM)02004000200400HEAT SINKNoneNoneNoneBGA Heat SinkBGA Heat SinkBGA Heat SinkθJA (°C/W)15.2141213.911.310.25Table 4. 3.3V Output at 12ADERATING CURVEFigure 13Figure 13Figure 13Figure 14Figure 14Figure 14VIN (V)121212121212POWER LOSS CURVEFigure 8Figure 8Figure 8Figure 8Figure 8Figure 8AIR FLOW (LFM)02004000200400HEAT SINKNoneNoneNoneBGA Heat SinkBGA Heat SinkBGA Heat SinkθJA (°C/W)15.214.613.413.911.110.5Heat Sink ManufacturerWakeﬁ eld Engineering Part No: 20069Phone: 603-635-280018

U4601hvf

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LTM4601HVAPPLICATIOS IFORATIOto 25°C inside the µModule with a thermal resistance θJC from junction to case between 6°C/W to 9°C/W. This will maintain the maximum junction temperature inside the µModule below 125°C.Safety ConsiderationsThe LTM4601HV modules do not provide isolation from VIN to VOUT. There is no internal fuse. If required, a slow blow fuse with a rating twice the maximum input current needs to be provided to protect each unit from catastrophic failure. Layout Checklist/ExampleThe high integration of LTM4601HV makes the PCB board layout very simple and easy. However, to optimize its electri-cal and thermal performance, some layout considerations are still necessary. • Use large PCB copper areas for high current path, in-cluding VIN, PGND and VOUT. It helps to minimize the PCB conduction loss and thermal stress. VINCINCINGNDCOUTVOUTCOUTFigure 17. Recommended LayoutU• Place high frequency ceramic input and output capaci-tors next to the VIN, PGND and VOUT pins to minimize high frequency noise. • Place a dedicated power ground layer underneath the unit. Refer frequency synchronization source to power ground.• To minimize the via conduction loss and reduce module thermal stress, use multiple vias for interconnection between top layer and other power layers. • Do not put vias directly on pads unless they are capped.• Use a separated SGND ground copper area for com-ponents connected to signal pins. Connect the SGND to PGND underneath the unit. Figure 17 gives a good example of the recommended layout. SIGNALGND4601HV F17WUU4601hvf19元器件交易网www.cecb2b.com

LTM4601HVAPPLICATIOS IFORATIO

Frequency AdjustmentThe LTM4601HV is designed to typically operate at 850kHz across most input conditions. The fSET pin is normally left open or decoupled with an optional 1000pF capacitor. The switching frequency has been optimized for maintaining constant output ripple noise over most operating ranges. The 850kHz switching frequency and the 400ns minimum off time can limit operation at higher duty cycles like 5V to 3.3V, and produce excessive inductor ripple currents for lower duty cycle applications like 28V to 5V. The 5V and 3.3V drop out curves are modiﬁ ed by adding an external resistor on the fSET pin to allow for lower input voltage operation, or higher input voltage operation.Example for 5V Output LTM4601HV minimum on-time = 100ns; tON = ((4.8 • 10pf)/IfSET) LTM4601HV minimum off-time = 400ns; tOFF = t – tON, where t = 1/Frequency Duty Cycle = tON/t or VOUT/VINEquations for setting frequency:IfSET = (VIN/(3 • RfSET)), for 28V operation, ISET = 238µA, tON = ((4.8 • 10pF)/IfSET), tON = 202ns, where the internal RfSET is 39.2k. Frequency = (VOUT/(VIN • tON)) = (5V/(28 • 202ns)) ~ 884kHz. The inductor ripple current begins to get high at the higher input voltages due to a larger voltage across the inductor. This is noted in the Typical Inductor Ripple Current verses Duty Cycle graph (Figure 3) where IL ≈ 10A at 20% duty cycle. The inductor ripple current can be lowered at the higher input voltages by adding an external resistor from fSET to ground to increase the switch-ing frequency. A 7A ripple current is chosen, and the total peak current is equal to 1/2 of the 7A ripple current plus the output current. The 5V output current is limited to 8A, so the total peak current is less than 11.5A. This is below 20

Uthe 14A peak speciﬁ ed value. A 100k resistor is placed from fSET to ground, and the parallel combination of 100k and 39.2k equates to 28k. The IfSET calculation with 28k and 28V input voltage equals 333µA. This equates to a tON of 144ns. This will increase the switching frequency from ~884kHz to ~1.24MHz for the 28V to 5V conversion. The minimum on time is above 100ns at 28V input. Since the switching frequency is approximately constant over input and output conditions, then the lower input voltage range is limited to 10V for the 1.24MHz operation due to the 400ns minimum off time. Equation: tON = (VOUT/VIN) • (1/Frequency) equates to a 400ns on time, and a 400ns ects an off time. The “VIN to VOUT Step Ratio Curve” reﬂoperating range of 10V to 28V for 1.24MHz operation with a 100k resistor to ground as shown in Figure 18, and an oating. These modiﬁ cations 8V to 16V operation for fSET ﬂare made to provide wider input voltage ranges for the 5V output designs while limiting the inductor ripple current, and maintaining the 400ns minimum off time.Example for 3.3V Output LTM4601HV minimum on-time = 100ns; tON = ((3.3 • 10pF)/IfSET) LTM4601HV minimum off-time = 400ns; tOFF = t – tON, where t = 1/Frequency Duty Cycle (DC) = tON/t or VOUT/VINEquations for setting frequency:IfSET = (VIN/(3 • RfSET)), for 28V operation, IfSET = 238µA, tON = ((3.3 • 10pf)/IfSET), tON = 138.7ns, where the internal RfSET is 39.2k. Frequency = (VOUT/(VIN • tON)) = (3.3V/(28 • 138.7ns)) ~ 850kHz. The minimum on-time and minimum-off time are within speciﬁ cation at 139ns and 1037ns. The 4.5V minimum input for converting 3.3V output will not meet the minimum off-time speciﬁ cation of 400ns. tON = 868ns, Frequency = 850kHz, tOFF = 315ns.4601hvf

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LTM4601HVAPPLICATIOS IFORATIOSolutionLower the switching frequency at lower input voltages to allow for higher duty cycles, and meet the 400ns mini-mum off-time at 4.5V input voltage. The off-time should be about 500ns with 100ns guard band. The duty cycle for (3.3V/4.5) = ~73%. Frequency = (1 – DC)/tOFF, or (1 – 0.73)/500ns = 540kHz. The switching frequency needs to be lowered to 540kHz at 4.5V input. tON = DC/frequency, or 1.35µs. The fSET pin voltage compliance is 1/3 of VIN, and the IfSET current equates to 38µA with the internal 39.2k. The IfSET current needs to be 24µA for VOUTVIN10V TO 28VR2100kR4100kVINPGOODMPGMRUNCOMPINTVCCDRVCCLTM4601HV5% MARGINC210µF25VR1392k1%C110µF25VSGNDIMPROVEEFFICIENCYFOR ≥12V INPUTDUALCMSSH-3C3SOT-323Figure 18. 5V at 8A Design Without Differential Ampliﬁ erU540kHz operation. As shown in Figure 19, a resistor can be placed from VOUT to fSET to lower the effective IfSET current out of the fSET pin to 24µA. The fSET pin is 4.5V/3 =1.5V and VOUT = 3.3V, therefore 130k will source 14µA into the fSET node and lower the IfSET current to 24µA. This enables the 540kHz operation and the 4.5V to 28V input operation for down converting to 3.3V output. The frequency will scale from 540kHz to 1.1 MHz over this input range. This provides for an effective output current of 8A over the input range.TRACK/SS CONTROLPLLINTRACK/SSVOUTVFBMARG0MARG1VOUT_LCLDIFFVOUTVOSNS+VOSNS–fSETRfSET100kMARGIN CONTROLRSET8.25kREVIEW TEMPERATUREDERATING CURVEVOUT5V8A22µF6.3VREFER TOTABLE 2WUU+C3100µF6.3VSANYOPOSCAPPGND4601HV F18 4601hvf21元器件交易网www.cecb2b.com

LTM4601HVAPPLICATIOS IFORATIOVIN4.5V TO 16VVOUTR2100kR4100kVINPGOODMPGMRUNCOMPINTVCCDRVCCPGOODC210µF25V×3R1392kSGNDPGND5% MARGINFigure 19. 3.3V at 10A DesignVOUTVIN22V TO 28VR2100kR4100kVINPGOODPGOODCINBULKOPT+CIN10µF25V×3 CERMPGMRUNON/OFFCOMPINTVCCDRVCCR1392kSGND5% MARGINFigure 20. Typical 22V to 28V, 1.5V at 10A Design, 500kHz22UTRACK/SS CONTROLPLLINTRACK/SSVOUTVFBMARG0MARG1VOUT_LCLDIFFVOUTVOSNS+VOSNS–fSETREVIEW TEMPERATUREDERATING CURVEVOUT3.3V10AC3100µF6.3VSANYOPOSCAP22µF6.3VLTM4601HVWUU+RfSET130kRSET13.3kMARGIN CONTROL4601HV F19CLOCK SYNCC50.01µFPLLINTRACK/SSVOUTVFBMARG0MARG1VOUT_LCLDIFFVOUTVOSNS+VOSNS–fSETRfSET175kVIN4601HV F20REVIEW TEMPERATUREDERATING CURVEC3 100pFMARGINCONTROLCOUT1100µF6.3V+COUT2470µF6.3VVOUT1.5V10ALTM4601HVPGNDREFER TOTABLE 2 FORRSETDIFFERENT40.2kOUTPUTVOLTAGE4601hvf元器件交易网www.cecb2b.com

LTM4601HVAPPLICATIOS IFORATIOVOUTVIN6V TO 28VCLOCK SYNC0° PHASER2100kR4100kVINPGOODMPGMRUNCOMPINTVCCDRVCCPLLINTRACK/SSVOUTVFBMARG0MARG1VOUT_LCLDIFFVOUTVOSNS+VOSNS–fSETRSET6.65kTRACK/SS CONTROLC10.1µF118k1%123+LTC6908-1V+GNDSETOUT1OUT2MOD654C5*100µF25VC210µF25V×22-PHASEOSCILLATORPGOODC810µF25V×2*C5 OPTIONAL TO REDUCE ANY LC RINGING. NOT NEEDED FOR LOW INDUCTANCE PLANE CONNECTIONFigure 21. 2-Phase Parallel, 3.3V at 20A DesignU60.4k+ RSETN VOUT = 0.6V RSETN = NUMBER OF PHASESVOUT3.3V20AC6 220pFLTM4601HVC322µF6.3VC4470µF6.3VWUU+R1392kSGNDPGNDREFER TOTABLE 2100pF5%MARGINMARGIN CONTROLCLOCK SYNC180° PHASETRACK/SS CONTROLC70.033µFVINPGOODMPGMRUNCOMPINTVCCDRVCC392kSGNDPGNDPLLINTRACK/SSVOUTVFBMARG0MARG1VOUT_LCLDIFFVOUTVOSNS+VOSNS–fSETC322µF6.3V+C4470µF6.3VLTM4601HVREFER TOTABLE 24601HV F214601hvf23元器件交易网www.cecb2b.com

LTM4601HVTYPICAL APPLICATIO SLTC6908-12-PHASEOSCILLATORV+R1118k3.3VVIN6V TO 28VR3100kR4100kC80.1µFGNDSETOUT1OUT2MOD180° PHASE3.3VR7100kR8100k0° PHASEVINPLLINC2100µF6.3VC110µF35VR2392kC30.15µFPGOODVOUTRUNFBCOMPVOUT_LCLDIFFVOUTINTVCCLTM4601HVDRVCCVOSNS+MPGMVOSNS–MARG0fSETTRACK/SSMARG1SGNDPGNDLTC6908-12-PHASEOSCILLATORV+R1182k3.3VVIN6V TO 28VR3100kR4100kC80.1µFGNDSETOUT1OUT2MOD180° PHASE3.3VVOUT11.8VC410A220µF6.3V3.3VTRACKR1660.4kR1540.2kR7100kR8100kVOUT21.5VC710A220µF6.3V0° PHASEVINPLLINC110µF35VR2392kC30.15µFPGOODVOUTRUNFBCOMPVOUT_LCLDIFFVOUTINTVCCLTM4601HVDRVCCVOSNS+MPGMVOSNS–MARG0fSETTRACK/SSMARG1SGNDPGND24UR113.3kVOUT13.3VC410A150µF6.3V3.3VTRACKR1660.4kR1519.1kVINPLLINC6100µF6.3VC510µF35VR6392kMARGIN CONTROLPGOODVOUTRUNFBCOMPVOUT_LCLDIFFVOUTINTVCCLTM4601HVDRVCCVOSNS+MPGMVOSNS–MARG0fSETTRACK/SSMARG1SGNDPGNDR519.1kVOUT22.5VC710A150µF6.3VMARGIN CONTROL4601HV F22Figure 22. Dual Outputs (3.3V and 2.5V) with TrackingC847pFR130.1kC2100µF6.3VVINPLLINC510µF35VR6392kMARGIN CONTROLPGOODVOUTRUNFBCOMPVOUT_LCLDIFFVOUTINTVCCLTM4601HVDRVCCVOSNS+MPGMVOSNS–MARG0fSETTRACK/SSMARG1SGNDPGNDC947pFR540.2kC6100µF6.3VMARGIN CONTROL4601HV F23Figure 23. Dual Outputs (1.8V and 1.5V) with Tracking4601hvfLGA Package118-Lead (15mm × 15mm)(Reference LTM DWG # 05-05-1801, Rev Ø)6.98505.71504.44503.17501.90500.63500.00000.63501.90503.17504.44505.71506.98502.72 – 2.92Yaaa Z15BSCX6.9850PAD 1CORNER45.71504.4450元器件交易网www.cecb2b.com

3.1750PACKAGE DESCRIPTIO1.905015BSC0.63500.00000.6350MOLDCAPSUBSTRATE1.90500.27 – 0.372.45 – 2.55DETAIL Bbbb ZZ3.17504.44505.7150aaa Z6.9850SUGGESTED SOLDER PAD LAYOUTTOP VIEWDETAIL ADETAIL B0.60 – 0.66MLKJHGFEDCBPADSSEE NOTES3A7101112DETAIL A0.60 – 0.66eeeMXYTOP VIEW0.12 – 0.2813.97BSCNOTES:1. DIMENSIONING AND TOLERANCING PER ASME Y14.5M-19942. ALL DIMENSIONS ARE IN MILLIMETERS3 LAND DESIGNATION PER JESD MO-222, SPP-0104DETAILS OF PAD #1 IDENTIFIER ARE OPTIONAL,BUT MUST BE LOCATED WITHIN THE ZONE INDICATED.THE PAD #1 IDENTIFIER MAY BE EITHER A MOLD OR MARKED FEATURE5. PRIMARY DATUM -Z- IS SEATING PLANE6. THE TOTAL NUMBER OF PADS: 118SYMBOLTOLERANCE0.10aaa0.10bbb0.03eee13.97BSC1.27BSCLGA 118 0306 REV ØC(0.30)PAD 1123456BOTTOM VIEWULTM4601HV254601hvf元器件交易网www.cecb2b.com

LTM4601HVPACKAGE DESCRIPTIO

PIN NAMEA1 VINA2 VINA3 VINA4 VINA5 VINA6 VINA7 INTVCCA8 PLLINA9 TRACK/SSA10 RUNA11 COMPA12 MPGMPIN NAMEG1 PGNDG2 PGNDG3 PGNDG4 PGNDG5 PGNDG6 PGNDG7 PGNDG8 PGNDG9 PGNDG10 -G11 -G12 PGOOD26

UPin Assignment Tables(Arranged by Pin Number)PIN NAMEB1 VINB2 VINB3 VINB4 VINB5 VINB6 VINB7 -B8 -B9 -B10 -B11 -B12 fSETPIN NAMEH1 PGNDH2 PGNDH3 PGNDH4 PGNDH5 PGNDH6 PGNDH7 PGNDH8 PGNDH9 PGNDH10 -H11 -H12 SGNDPIN NAMEC1 VINC2 VINC3 VINC4 VINC5 VINC6 VINC7 -C8 -C9 -C10 -C11 -C12 MARG0PIN NAMEJ1 VOUTJ2 VOUTJ3 VOUTJ4 VOUTJ5 VOUTJ6 VOUTJ7 VOUTJ8 VOUTJ9 VOUTJ10 VOUTJ11 -J12 VOSNS+PIN NAMED1 PGNDD2 PGNDD3 PGNDD4 PGNDD5 PGNDD6 PGNDD7 -D8 -D9 -D10 -D11 -D12 MARG1PIN NAMEK1 VOUTK2 VOUTK3 VOUTK4 VOUTK5 VOUTK6 VOUTK7 VOUTK8 VOUTK9 VOUTK10 VOUTK11 VOUTK12 DIFFVOUTPIN NAMEE1 PGNDE2 PGNDE3 PGNDE4 PGNDE5 PGNDE6 PGNDE7 PGNDE8 -E9 -E10 -E11 -E12 DRVCCPIN NAMEL1 VOUTL2 VOUTL3 VOUTL4 VOUTL5 VOUTL6 VOUTL7 VOUTL8 VOUTL9 VOUTL10 VOUTL11 VOUTL12 VOUT_LCLFFFFFFFFFFFFPIN NAME1 PGND2 PGND3 PGND4 PGND5 PGND6 PGND7 PGND8 PGND9 PGND10 -11 -12 VFBPIN NAMEM1 VOUTM2 VOUTM3 VOUTM4 VOUTM5 VOUTM6 VOUTM7 VOUTM8 VOUTM9 VOUTM10 VOUTM11 VOUTM12 VOSNS–4601hvf

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LTM4601HVPACKAGE DESCRIPTIO

PIN NAMEA1A2A3A4A5A6B1B2B3B4B5B6C1C2C3C4C5C6VINVINVINVINVINVINVINVINVINVINVINVINVINVINVINVINVINVIND1D2D3D4D5D6E1E2E3E4E5E6E7F1F2F3F4F5F6F7F8F9G1G2G3G4G5G6G7G8G9H1H2H3H4H5H6H7H8H9PIN NAMEPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDPGNDJ1J2J3J4J5J6J7J8J9J10K1K2K3K4K5K6K7K8K9K10K11L1L2L3L4L5L6L7L8L9L10L11M1M2M3M4M5M6M7M8M9M10M11Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.UPin Assignment Tables(Arranged by Pin Function)PIN NAMEVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTVOUTA7A8A9A10A11A12B12C12D12E12F12G12H12J12K12L12M12PIN NAMEINTVCCPLLINTRACK/SSRUNCOMPMPGMfSETMARG0MARG1DRVCCVFBPGOODSGNDVOSNS+DIFFVOUTVOUT_LCLVOSNS–B7B8B9B10B11C7C8C9C10C11D7D8D9D10D11E8E9E10E11F10F11G10G11H10H11J11PIN NAME--------------------------4601hvf

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LTM4601HVRELATED PARTS

PART NUMBERLTC2900LTC2923LT3825/LT3837LTM4600LTM46O2LTM4603DESCRIPTIONQuad Supply Monitor with Adjustable Reset TimerPower Supply Tracking ControllerSynchronous Isolated Flyback Controllers10A DC/DC µModule6A DC/DC µModule6A DC/DC µModule with Tracking PLL/MarginingCOMMENTSMonitors Four Supplies; Adjustable Reset TimerTracks Both Up and Down; Power Supply SequencingNo Optocoupler Required; 3.3V, 12A Output; Simple DesignFast Transient ResponsePin Compatible with the LTM4600Pin Compatible with the LTM4601This product contains technology licensed from Silicon Semiconductor Corporation.4601hvf

LT 0307 • PRINTED IN USA

®28

Linear Technology Corporation1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com© LINEAR TECHNOLOGY CORPORATION 2007

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