POWER LOSS (W) POWER LOSS (W) LT8602 42V Quad Monolithic Synchronous Step-Down Regulator FEATURES DESCRIPTION n Flexible Power Supply System Providing Four The LT 8602 is a quad channel, current mode, monolithic Outputs with a Wide Input Range buck switching regulator with a programmable power-on n Two High Voltage Synchronous Buck Regulators: reset. All regulators are synchronized to a single oscillator 3V to 42V Input Voltage Range with an adjustable frequency from 250kHz to 2.2MHz. The Output Currents Up to 2.5A and 1.5A LT8602 can be configured for micropower Burst Mode High Efficiency Up to 93% operation or pulse-skipping operation at light load. Mi- n Two Low Voltage Synchronous Buck Regulators: cropower operation results in quiescent current of 30A 2.6V to 5.5V Input Voltage Range with all four regulators operating in the application below. Output Currents Up to 1.8A and 94% Efficiency The high voltage channels are synchronous buck regula- n Resistor Programmable and Synchronizable tors that operate from an input of 3V to 42V. The output 250kHz to 2.2MHz Switching Frequency currents are up to 1.5A (OUT1) and 2.5A (OUT2). The n Low Ripple Burst Mode Operation: low voltage channels operate from an input of 2.6V to 30A I at 12V Q IN 5.5V. Internal synchronous power switches provide high Output Ripple < 15mV efficiency with output currents up to 1.8A. The LT8602 n Programmable Power-On Reset uses a 2-phase clock with channels 1 and 3 operating 180 n Power Good Indicators from channels 2 and 4 to reduce input ripple current on n 2-Phase Clock Reduces Input Current Ripple both HV and LV inputs. All channels have cycle-by-cycle n Available in Thermally Enhanced 40-Lead QFN current limit, providing protection against shorted outputs. (6mm6mm) or 48-Lead (7mm7mm) LQFP Packages Thermal shutdown provides additional protection. n AEC-Q100 Qualified for Automotive Applications The LT8602 is available in either a 40-lead 6mm 6mm APPLICATIONS QFN or a 48-Lead 7mm7mm LQFP package. n All registered trademarks and trademarks are the property of their respective owners. Automotive Systems n Distributed Supply Regulation n Industrial Controls and Power Supplies TYPICAL APPLICATION 5V, 3.3V, 1.8V and 1.2V Step-Down Regulators IN V BST1 IN 6V TO 42V LT8602 PV IN1 OUT1 SW1 PV 5V, 1.5A IN2 HV Channel Efficiency, LV Channel Efficiency, FB1 EN/UVLO V = 12V, V = 5V V = 1.8V IN OUT1 OUT3 POREN BST2 100 2.0 100 1.0 RST OUT2 90 1.8 90 0.9 4 SW2 3.3V* EFFICIENCY PG1-4 EFFICIENCY FB2 80 1.6 80 0.8 2 RUN3-4 70 1.4 70 0.7 BIAS 60 1.2 60 0.6 PV F = 1MHz F = 1MHz IN3 SW SW OUT3 50 1.0 50 0.5 SW3 F = 2MHz F = 2MHz SW SW 1.8V, 1.7A PV OUT2 IN4 40 0.8 40 0.4 FB3 INTV CC 30 0.6 30 0.3 0.4 0.2 CPOR 20 20 POWER POWER LOSS 2 OUT4 10 0.2 10 0.1 LOSS TRKSS1, 2 SW4 1.2V, 1.8A FB4 0 0 0 0 RT 0 0.3 0.6 0.9 1.2 1.5 0 0.3 0.6 0.9 1.2 1.5 1.8 SYNC LOAD CURRENT (A) LOAD CURRENT (A) GND 8602 TA01b 8602 TA01c *I = 2.5A I I 8602 TA01a OUT2 PVIN3 PVIN4 Rev. C 1 Document Feedback For more information www.analog.com EFFICIENCY (%) EFFICIENCY (%)LT8602 ABSOLUTE MAXIMUM RATINGS (Note 1) Supply Voltages BIAS Voltage .............................................. 0.3V to 15V V , PV ............................................ 0.3V to 42V Operating Junction Temperature (Notes 2, 3) IN IN1,2 PV ..................................................... 0.3V to 6V LT8602E ............................................ 40C to 125C IN3,4 PG1-4, SYNC, TRKSS1-2, RUN3-4, RST Voltages ........6V LT8602I ............................................. 40C to 125C RT, FB1-4, CPOR, POREN Voltages ..........................3.6V LT8602J ............................................. 40C to 150C EN/UVLO Voltage ......................................................42V Storage Temperature Range .................. 65C to 150C PIN CONFIGURATION TOP VIEW TOP VIEW 40 39 38 37 36 35 34 33 32 31 PG1 1 30 RUN3 PG1 1 36 CPOR GND 2 29 RT GND 2 35 RUN3 SW1 3 28 INTV CC GND 3 34 RT SW1 4 33 INTVCC BST1 4 27 FB3 SW1 5 32 FB3 BST2 5 26 FB1 49 41 BST1 6 31 FB1 GND GND BST2 7 30 GND SW2 6 25 FB2 SW2 8 29 FB2 SW2 7 24 FB4 SW2 9 28 FB4 GND 10 27 VIN GND 8 23 V IN GND 11 26 EN/UVLO GND 9 22 EN/UVLO BIAS 12 25 TRKSS1 BIAS 10 21 TRKSS1 11 12 13 14 15 16 17 18 19 20 UJ PACKAGE LXE PACKAGE 40-LEAD (6mm 6mm) PLASTIC QFN 48-LEAD (7mm 7mm) PLASTIC LQFP = 2C/W, = 33C/W JC JA = 20C/W JA EXPOSED PAD (PIN 41) IS GND, MUST BE SOLDERED TO PCB EXPOSED PAD (PIN 49) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION TAPE AND REEL (QFN)/ MSL LEAD FREE FINISH TRAY (LXE) PART MARKING* PACKAGE DESCRIPTION RATING TEMPERATURE RANGE LT8602EUJ PBF LT8602EUJ TRPBF LT8602UJ 40-Lead (6mm 6mm) Plastic QFN 1 40C to 125C LT8602IUJ PBF LT8602IUJ TRPBF LT8602UJ 40-Lead (6mm 6mm) Plastic QFN 1 40C to 125C LT8602JUJ PBF LT8602JUJ TRPBF LT8602UJ 40-Lead (6mm 6mm) Plastic QFN 1 40C to 150C LT8602ELXE PBF LT8602ELXE TRPBF LT8602LXE 48-Lead (7mm 7mm) Plastic eLQFP 3 40C to 125C LT8602ILXE PBF LT8602ILXE TRPBF LT8602LXE 48-Lead (7mm 7mm) Plastic eLQFP 3 40C to 125C Rev. C 2 For more information www.analog.com PG2 PG3 PG4 POREN GND GND PV PV IN2 IN1 SW4 SW3 GND GND PV PV IN4 IN3 RUN4 SYNC NC RST TRKSS2 CPOR 48 PG3 PG2 13 47 POREN PG4 14 46 GND GND 15 45 PVIN1 PVIN2 16 44 PVIN1 PVIN2 17 43 GND GND 18 42 SW3 SW4 19 41 GND GND 20 40 PVIN3 PVIN4 21 39 GND GND 22 38 SYNC RUN4 23 37 RSTB TRKSS2 24