LTM4657 20V , 8A Step-Down DC/DC IN Module Regulator FEATURES DESCRIPTION 2 n Complete Solution in <1cm (Single-Sided PCB) or The LTM 4657 is a complete 8A step-down switching 2 0.5cm (Dual-Sided PCB) mode Module (micromodule) regulator in a tiny 6.25mm n 6.25mm 6.25mm 3.87mm BGA Package 6.25mm 3.87mm BGA package. Included in the pack- n Wide Input Voltage Range: 3.1V to 20V age are the switching controller, power FETs, inductor and n 0.5V to 5.5V Output Voltage support components. Operating over an input voltage n 8A DC Output Current range of 3.1V to 20V, the LTM4657 supports an output n 1.5% Maximum Total DC Output Voltage Error voltage range of 0.5V to 5.5V, set by a single external Over Line, Load and Temperature resistor. Its high efficiency design delivers up to 8A con- n Differential Remote Sensing Amp tinuous output current. Only bulk input and output capac- n Current Mode Control, Fast Transient Response itors are needed. n External Frequency Synchronization The LTM4657 supports selectable discontinuous mode n Multiphase Parallel Current Sharing with operation and output voltage tracking for supply rail MultipleLTM4657s sequencing. Its high switching frequency and current n Output Voltage Tracking mode control enable a very fast transient response to n Selectable Discontinuous Mode line and load changes without sacrificing stability. n Power Good Indicator n Overvoltage, Overcurrent and Overtemperature Fault protection features incl0ude overvoltage, overcur- Protection rent and overtemperature protection. n Pin Compatible with LTM4626(12A) and LTM4638(15A) The LTM4657 is available with SnPb or RoHS compliant terminal finish. APPLICATIONS All registered trademarks and trademarks are the property of their respective owners. n Telecom, Datacom, Networking and Industrial Equipment n Medical Diagnostic Equipment n Data Storage Rack Units and Cards n Test and Debug Systems TYPICAL APPLICATION Efficiency vs Load Current for V = 1V OUT 8A, 1.0V Output DC/DC Module Step-Down Regulator 95 500kHz 90 FREQ CLKOUT V OUT V IN V V 1.0V OUT IN 3.1V TO 20V 85 + 100F 8A 10F V RUN OSNS x2 LTM4657 INTV CC PGOOD 80 MODE/CLKIN COMPa COMPb TRACK/SS 75 0.1F PHMODE FB 70 60.4k 12V IN GND V OSNS 5V IN 65 0 1 2 3 4 5 6 7 8 4657 TA01a OUTPUT LOAD CURRENT (A) 4657 TA01b Rev. A 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LTM4657 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) (See Pin Functions, Pin Configuration Table) V ............................................................. 0.3V to 22V IN TOP VIEW SW V ............................................................. 0.3V to 6V OUT T SENSE INTV ...................................................... 0.3V to 3.6V CC 7 GND T + RUN ........................................................... 0.3V to 22V SENSE 6 PGOOD, FREQ, COMPa, COMPb, PGOOD V OUT 5 PHMODE PHMODE, CLKOUT, FB .............................. 0.3V to 3.6V RUN MODE/CLKIN, TRACK/SS .....................0.3V to INTV CC 4 V IN + V ......................................................... 0.3V to 6V INTV OSNS CC V 3 OUT V ...................................................... 0.3V to 0.3V OSNS MODE/CLKIN V OSNS TRACK/SS Internal Operating Temperature Range 2 V + CLKOUT OSNS (Notes 2, 3) ............................................ 40C to 125C 1 Storage Temperature Range .................. 55C to 125C FB COMPb COMPa FREQ Peak Solder Reflow Body Temperature ................. 250C A B C D E F G BGA PACKAGE 49-LEAD (6.25mm 6.25mm 3.87mm) T = 125C, = 17C/W, JMAX JA = 9.4C/W, = 4.0C/W JCTOP JCBOTTOM NOTE: 1) VALUES ARE DETERMINED BY SIMULATION PER JESD51 CONDITIONS. 2) VALUE IS OBTAINED WITH DEMO BOARD. JA 3) REFER TO PAGE 19 FOR LAB MEASUREMENT AND DE-RATING INFORMATION. 4) WEIGHT = 497mg ORDER INFORMATION PART MARKING* PACKAGE MSL TEMPERATURE RANGE PART NUMBER PAD OR BALL FINISH DEVICE FINISH CODE TYPE RATING (Note 2) LTM4657EY PBF SAC305 (RoHS) 4657 e1 BGA 3 40C to 125C LTM4657IY PBF SAC305 (RoHS) 4657 e1 BGA 3 40C to 125C LTM4657IY SnPb 4657 e0 BGA 3 40C to 125C Contact the factory for parts specified with wider operating temperature Recommended LGA and BGA PCB Assembly and Manufacturing ranges. *Pad or ball finish code is per IPC/JEDEC J-STD-609. Procedures LGA and BGA Package and Tray Drawings ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified internal operating temperature range (Note 2), otherwise specifications are at T = 25C. V = 12V per the typical application shown on the A IN front page. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Switching Regulator Section: per Channel V Input DC Voltage V l 3.1 20 V IN IN l V Output Voltage Range 0.5 5.5 V OUT V Output Voltage, Total C = 22F, C = 100F Ceramic, R = 30.2k, OUT(DC) IN OUT FB Variation with Line and Load MODE = INTV , I = 0A to 8A (Note 3) CC OUT 40C to 125C l 1.477 1.50 1.523 V V RUN Pin On Threshold V Rising 1.05 1.20 1.35 V RUN RUN Rev. A 2 For more information www.analog.com