LTM4641 38V, 10A DC/DC Module Regulator with Advanced Input and Load Protection Fea T Descrip T n Wide Operating Input Voltage Range: 4.5V to 38V The LTM 4641 is a switch mode step-down DC/DC n 10A DC Typical, 12A Peak Output Current Module (micromodule) regulator with advanced input n Output Range: 0.6V to 6V and load protection features. Trip detection thresholds for n 1.5% Maximum Total Output DC Voltage Error the following faults are customizable: input undervoltage, n Differential Remote Sense Amplifier for POL Regulation overtemperature, input overvoltage and output overvolt- n Internal Temperature, Analog Indicator Output age. Select fault conditions can be set for latchoff or n Overcurrent Foldback and Overtemperature hysteretic restart responseor disabled. Included in the Protection package are the switching controller and housekeeping ICs, n Current Mode Control/Fast Transient Response power MOSFETs, inductor, overvoltage drivers, biasing n Parallelable for Higher Output Current circuitry and supporting components. Operating from input n Selectable Pulse-Skipping Operation voltages of 4V to 38V (4.5V start-up), the device supports n Soft-Start/Voltage Tracking/Pre-Bias Start-Up output voltages from 0.6V to 6V, set by an external resis- n 15mm 15mm 5.01mm BGA Package tor network remote sensing the point-of-loads voltage. n SnPb or RoHS Compliant Finish The LTM4641s high efficiency design can deliver up to Input Protection 10A continuous current with a few input and output ca- n UVLO, Overvoltage Shutdown and Latchoff Thresholds pacitors. The regulators constant on-time current mode n N-Channel Overvoltage Power-Interrupt MOSFET Driver control architecture enables high step-down ratios and n Surge Stopper Capable with Few External Components fast response to transient line and load changes. The Load Protection LTM4641 is offered in a 15mm 15mm 5.01mm with n Robust, Resettable Latchoff Overvoltage Protection SnPb or RoHS compliant terminal finish. n N-Channel Overvoltage Crowbar Power MOSFET Driver L, LT, LTC, LTM, Module, Burst Mode, Linear Technology and the Linear logo are registered trademarks and LTpowerCAD is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents including a T 5481178, 5847554, 6100678, 6304066, 6580258, 6677210, 8163643. n Ruggedized Electronics Click to view associated TechClip Videos. n Avionics and Industrial Equipment Typical a T Module Regulator with Input Disconnect and Fast Crowbar Output Overvoltage Protection 4 1V Load Protected from M TOP V MSP* IN Short-Circuit at 38V IN 4V TO 38V + 3 10F 4.5V START-UP 100F 50V 50V SHORT-CIRCUIT APPLIED 2 1 V V V SW V ING INGP INH M OUT TOP 4 1V V V 2 V , V (25V/DIV) INL OUT 10A INL INH 100F 3 750k 3 CROWBAR (5V/DIV) 2 MCB** CROWBAR f 1.1V PEAK OUT SET M BOT 5.49k + UVLO V OSNS INTV LTM4641 CC LOAD 5.49k V DRV OUT CC V OSNS (200mV/DIV) RUN GND 1 4641 TA01a TRACK/SS OV PGM 10nF IOVRETRY OVLO FCB LATCH SGND 5.6M 4641 TA01b 4s/DIV TESTED AT WORST-CASE CONDITION: NO LOAD SGND CONNECTS TO GND INTERNAL TO MODULE REGULATOR * MSP: (OPTIONAL) SERIES-PASS OVERVOLTAGE POWER INTERRUPT MOSFET, NXP PSMN014-60LS **MCB: (OPTIONAL) OUTPUT OVERVOLTAGE CROWBAR MOSFET, NXP PH2625L 4641fe 1 For more information www.linear.com/LTM4641 ion pplica ions pplica ion uresLTM4641 Table o F c T Ts Features ..................................................... 1 Applications InformationLoad Protection Applications ................................................ 1 Features .................................................... 32 Typical Application ........................................ 1 Overcurrent Foldback Protection ............................32 Description.................................................. 1 Power Good Indicator and Latching Output Absolute Maximum Ratings .............................. 3 Overvoltage Protection ...........................................32 Order Information .......................................... 3 Power-Interrupt MOSFET (MSP), CROWBAR Pin Pin Configuration .......................................... 3 and Output CROWBAR MOSFET (MCB) ..................33 Electrical Characteristics ................................. 4 Fast Output Overvoltage Comparator Threshold .....34 Typical Performance Characteristics ................... 8 The Switching Node: SW Pin ..................................35 Pin Functions .............................................. 10 Applications InformationEMI Performance ........ 35 Simplified Block Diagram ............................... 15 Applications InformationMultimodule Decoupling Requirements ............................... 15 Parallel Operation ........................................ 36 Operation................................................... 16 Applications InformationThermal Considerations Introduction ............................................................ 16 and Output Current Derating ............................ 38 Motivation ............................................................... 16 Thermal Considerations and Power Module Regulator Reliability ...................... 16 Output Current Derating .........................................38 Overview ................................................................. 16 Applications InformationOutput Capacitance Applications InformationPower Supply Features . 17 Table ........................................................ 45 Power (V ) and Bias (V ) Input Pins ................. 17 Applications InformationSafety and Layout INH INL Switching Frequency (On Time) Selection and Guidance ................................................... 46 Voltage Dropout Criteria (Achievable V -to-V Safety Considerations .............................................46 IN OUT Step-Down Ratios).................................................. 18 Layout Checklist/Example ......................................46 Setting the Output Voltage the Differential Typical Applications ...................................... 48 Remote Sense Amplifier .........................................21 Appendices ................................................ 56 Input Capacitors .....................................................23 Appendix A. Functional Block Diagram and Output Capacitors and Features Quick Reference Guide .............................56 Loop Stability/Loop Compensation .........................23 Appendix B. Start-Up/Shutdown State Diagram .....57 Pulse-Skipping Mode vs Appendix C. Switching Frequency Considerations Forced Continuous Mode ....................................... 24 and Usage of R .................................................58 fSET Soft-Start, Rail-Tracking and Start-Up Into Appendix D. Remote Sensing in Pre-Bias .................................................................. 24 Harsh Environments ...............................................59 INTV and DRV Appendix E. Inspiration For Pulse-Skipping CC CC ...............................................................27 1V Mode Operation ......................................................60 REF .........................................................................................28 TEMP, OTBH and Overtemperature Protection ........28 Appendix F. Adjusting the Fast Output Overvoltage Input Monitoring Pins: UVLO, IOVRETRY, OVLO ....29 Comparator Threshold ............................................60 Applications InformationInput Protection Package Description ..................................... 63 Features .................................................... 29 Package Photo ............................................ 63 Start-Up/Shutdown and Run Enable Package Description ..................................... 64 Power-On Reset and Timeout Delay Time ...............31 Revision History .......................................... 65 Typical Application ....................................... 66 Related Parts .............................................. 66 4641fe 2 For more information www.linear.com/LTM4641 en on