LTM4645 25A DC/DC Step-Down Module Regulator Fea T Descrip T n 4.7V to 15V Input Voltage Range The LTM 4645 is a 25A output switching mode step-down n 0.6V to 1.8V Output Voltage Range DC/DC Module (power module) regulator. Included in n 25A DC Output Current the package are the switching controller, power FETs, in- n 1.2% Total DC Output Voltage Error (40C to 125C) ductor and all supporting components. Operating over an n High Reliability N + 1 Phase Redundancy Supported input voltage range of 4.7V to 15V, the LTM4645 supports n Internal or External Control Loop Compensation an output voltage range of 0.6V to 1.8V, set by a single n Differential Remote Sense Amplifier for Precision external resistor. Only a few input and output capacitors Regulation are needed. n Current Mode Control/Fast Transient Response Its high efficiency design delivers about 86% efficiency n Multiphase Current Sharing Up to 150A from 12V input to 1.0V output with 25A continuous load n Built-In Temperature Monitoring current. High switching frequency and a current-mode n Selectable Pulse-Skipping, Burst Mode Operation architecture enable a very fast transient response to line n Soft-Start/Voltage Tracking and load changes without sacrificing stability. The device n Frequency Synchronization supports frequency synchronization, programmable n Output Overvoltage Protection multiphase operation, N+1 phase redundancy, and output n Output Overcurrent Foldback Protection voltage tracking for supply rail sequencing. n 9mm 15mm 3.51mm BGA Package Fault protection features include overvoltage and overcur- rent protection. The power module is offered in a space a T saving 9mm 15mm 3.51mm BGA package. The n Telecom, Networking and Industrial Equipment LTM4645 is available with SnPb (BGA) or RoHS compli- n Point of Load Regulation ant terminal finish. L, LT, LTC, LTM, Linear Technology, the Linear logo, Burst Mode, Module, LTpowerCAD and PolyPhase are registered trademarks of Analog Devices, Inc. All other trademarks are the property of their respective owners. Typical a T Efficiency vs Output Current 12V , 1V , 25A DC/DC Module Regulator IN OUT at 1V Output 100 4.7F 1F 6.3V 95 2.2 SV DRV INTV 90 IN CC CC V IN V IN 6V TO 15V 22F 85 HIZB 25V 2 FREQ LTM4645 80 V OUT 1V V OUT 25A 75 43.2k + COMPa V 47pF OSNS COMPb V FB 70 100F TRACK/SS V OSNS 90.9k 6.3V 65 5V INPUT 0.1F 4 12V INPUT SGND GND 60 4645 TA01a 0 5 10 15 20 25 PINS NOT USED IN THIS CIRCUIT: LOAD CURRENT (A) CLKOUT, MODE/PLLIN, PGOOD, + 4645 TA01b PHASMD, PWM, RUN, SW, TEMP , TEMP 4645f 1 For more information www.linear.com/LTM4645 EFFICIENCY (%) ion pplica ions pplica ion uresLTM4645 a Te Maxi Mu M r a T p c F T (Note 1) TOP VIEW V , SV , HIZB .......................................... 0.3V to 16V IN IN 1 2 3 4 5 6 7 V , ......................................................... 0.3V to 3.5V GND GND RUN GND OUT A CLKOUT INTV , DRV , PGOOD, RUN ..................... 0.3V to 6V CC CC V PWM IN TEST1 + B MODE/PLLIN MODE/PLLIN, TRACK/SS, V , V , OSNS OSNS DRV INTV CC CC C PHASMD CLKOUT, COMPa, COMPb, V , PHASMD, FB TEST2 SV IN FREQ ....................................................0.3V to INTV D FREQ CC GND HIZB V TEMP FB Operating Junction Temperature (Note 2) .. 40 to 125C E SGND TRACK/SS SW GND + TEMP Storage Temperature Range ...................... 55 to 125C TEST3 F + V V OSNS OSNS Peak Solder Reflow Body Temperature ................. 250C G PGOOD + GND COMPa TEMP , TEMP .......................................... 0.3V to 0.8V COMPb H J V GND OUT K L BGA PACKAGE 77-LEAD (9mm 15mm 3.51mm) T = 125C, = 9.5C/W, = 4C/W, = 6.7C/W, = 4.5C/W J(MAX) JA JCbottom JCtop JB DERIVED FROM 95mm 76mm PCB WITH SIX LAYERS WEIGHT = 1.3g JA VALUES DETERMINED PER JESD51-12 o r D i n F Ma T