LT8357 60V 2MHz Low-I Boost, SEPIC Q and Flyback Controller FEATURES DESCRIPTION n Wide Input Voltage Range: 3V to 60V The LT 8357 is a wide input range, current mode, DC/DC n Low I Burst Mode Operation: 8A controller which can be configured as a boost, SEPIC or Q n Up to 95% Efficiency at 2MHz flyback converter. The LT8357 drives a low side N-channel n 1.5% Internal 1V Voltage Reference power MOSFET with 5V split gate drive. The current mode n 5V Split Gate Drive for Efficiency and EMI Optimization architecture allows adjustable and synchronizable 100kHz n 100kHz to 2MHz Fixed Switching Frequency with to 2MHz fixed frequency operation, or internal 19% trian- External Clock Synchronization gle spread spectrum operation for low EMI. At light load, n Spread Spectrum Frequency Modulation for Low EMI either pulse-skipping mode or low-ripple Burst Mode n Accurate Enable Threshold with Hysteresis operation can be selected. Additional features include n Programmable Output Soft-Start and Tracking output power good and output short circuit protection in n Thermally-Enhanced 12-Lead MSOP Package SEPIC and flyback configurations. With a wide 3V to 60V input voltage range and 8A low quiescent current, the LT8357 provides a simple, com- APPLICATIONS pact and efficient solution for automotive, industrial, and n Automotive and Industrial Systems battery-powered systems. n Battery-Powered Systems All registered trademarks and trademarks are the property of their respective owners. n Portable Electronic Equipment TYPICAL APPLICATION 2MHz, 8V to 16V Input, 24V/2A Output Boost Converter Efficiency vs Load Current 100 f = 2MHz SW D1 2.2H BURST V V IN OUT 90 8V TO 16V 24V 10F 22F 2A 25V 35V V IN 1M x2 80 EN/UVLO GATEP M1 GATEN 196k 70 SYNC/MODE SENSE 1MEG LT8357 60 V = 16V INTV PGOOD FB IN CC V = 12V 100k IN V = 8V IN 5m 43.2k 50 V GND 0.0001 0.001 0.01 0.1 1 10 C LOAD CURRENT (A) 8357 TA01b SS RT INTV 22k CC 8357 TA01a 15k 10nF 47nF 2.2F 2MHz Rev. 0 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT8357 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) V , EN/UVLO ............................................. 0.3V to 60V IN TOP VIEW SENSE ....................................................... 0.3V to 0.3V V 1 12 V C IN INTV ......................................................... 0.3V to 6V FB 2 11 EN/UVLO CC PGOOD 3 10 INTV CC 13 SYNC/MODE, RT, SS, PGOOD, FB, V .......... 0.3V to 6V C SS 4 9 GATEP RT 5 8 GATEN GATEP, GATEN ................................................... (Note 2) 6 SYNC/MODE 7 SENSE Operating Junction Temperature Range (Notes 3, 4) MSE PACKAGE LT8357E ............................................ 40C to 125C 12-LEAD PLASTIC MSOP LT8357J ............................................. 40C to 150C = 40C/W, = 10C/W JA JC EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB LT8357H ............................................ 40C to 150C Storage Temperature Range MSOP ................................................ 65C to 150C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT8357EMSE PBF LT8357EMSE TRPBF 8357 12-Lead Plastic MSOP 40C to 125C LT8357JMSE PBF LT8357JMSE TRPBF 8357 12-Lead Plastic MSOP 40C to 150C LT8357HMSE PBF LT8357HMSE TRPBF 8357 12-Lead Plastic MSOP 40C to 150C Contact the factory for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with TRMPBF suffix. ELECTRICAL CHARACTERISTICSThe l denotes specifications which apply over the full operating junction temperature range, otherwise specifications are at T = 25C (Note 3). V = 12V, EN/UVLO = 1.5V, C = 2.2F to GND, unless A IN INTVCC otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS Supply l V Operating Voltage Range 3 60 V IN V Quiescent Current IN In Shutdown V = 0.3V 1.7 3 A EN/UVLO In Sleep Mode (Not Switching) V = 1.05V, V = 0V 8 20 A FB SYNC/MODE In Active Mode (Not Switching) V = 1.05V, V = Float 830 1200 A FB SYNC/MODE Logic Input EN/UVLO Shutdown Threshold l 0.3 0.6 0.9 V l EN/UVLO Enable Threshold Rising 1.183 1.220 1.257 V EN/UVLO Enable Hysteresis 42 mV EN/UVLO Input Bias Current V = 60V -50 50 nA EN/UVLO Rev. 0 2 For more information www.analog.com