LT3757/LT3757A Boost, Flyback, SEPIC and Inverting Controller FEATURES DESCRIPTION n Wide Input Voltage Range: 2.9V to 40V The LT 3757/LT3757A are wide input range, current n Positive or Negative Output Voltage Programming mode, DC/DC controllers which are capable of generating with a Single Feedback Pin either positive or negative output voltages. They can be n Current Mode Control Provides Excellent Transient configured as either a boost, flyback, SEPIC or inverting Response converter. The LT3757/LT3757A drive a low side external n Programmable Operating Frequency (100kHz to N-channel power MOSFET from an internal regulated 7.2V 1MHz) with One External Resistor supply. The fixed frequency, current-mode architecture n Synchronizable to an External Clock results in stable operation over a wide range of supply n Low Shutdown Current < 1A and output voltages. n Internal 7.2V Low Dropout Voltage Regulator The operating frequency of LT3757/LT3757A can be set n Programmable Input Undervoltage Lockout with with an external resistor over a 100kHz to 1MHz range, Hysteresis and can be synchronized to an external clock using the n Programmable Soft-Start SYNC pin. A low minimum operating supply voltage of n Small 10-Lead DFN (3mm 3mm) and Thermally 2.9V, and a low shutdown quiescent current of less than Enhanced 10-Pin MSOP Packages 1A, make the LT3757/LT3757A ideally suited for battery- n AEC-Q100 Qualified for Automotive Applications operated systems. The LT3757/LT3757A feature soft-start and frequency APPLICATIONS foldback functions to limit inductor current during start- n Automotive and Industrial Boost, Flyback, SEPIC and up and output short-circuit. The LT3757A has improved Inverting Converters load transient performance compared to the LT3757. n Telecom Power Supplies All registered trademarks and trademarks are the property of their respective owners. n Portable Electronic Equipment TYPICAL APPLICATION High Efficiency Boost Converter Efficiency V IN 100 8V TO 16V 10F 200k V 25V IN 90 10H X5R SHDN/UVLO V = 8V V IN OUT 80 24V 43.2k V = 16V 2A LT3757 IN SYNC GATE 70 226k SENSE 60 RT + 47F SS FBX 35V 50 GND V INTV CC C 2 41.2k 16.2k 300kHz 40 22k 4.7F 10F 0.1F 10V 0.01 25V 30 X5R X5R 6.8nF 0.001 0.01 0.1 1 10 OUTPUT CURRENT (A) 3757 TA01b 3757 TA01a Rev. G 1 Document Feedback For more information www.analog.com EFFICIENCY (%)LT3757/LT3757A ABSOLUTE MAXIMUM RATINGS (Note 1) Operating Temperature Range (Notes 2, 8) V , SHDN/UVLO (Note 6) .........................................40V IN LT3757E/LT3757AE............................ 40C to 125C INTV ....................................................V + 0.3V, 20V CC IN LT3757I/LT3757AI ............................. 40C to 125C GATE ........................................................ INTV + 0.3V CC LT3757H/LT3757AH ........................... 40C to 150C SYNC ..........................................................................8V LT3757MP/LT3757AMP ..................... 55C to 150C V , SS .........................................................................3V C Storage Temperature Range RT ............................................................................1.5V DFN .................................................... 65C to 125C SENSE ....................................................................0.3V MSOP ................................................ 65C to 150C FBX ................................................................. 6V to 6V Lead Temperature (Soldering, 10 sec) MSOP ...............................................................300C PIN CONFIGURATION TOP VIEW TOP VIEW V 1 10 V C IN V 1 10 V IN C FBX 2 9 SHDN/UVLO FBX 2 9 SHDN/UVLO 11 SS 3 11 8 INTV SS 3 8 INTV CC CC RT 4 7 GATE RT 4 7 GATE SYNC 5 6 SENSE SYNC 5 6 SENSE MSE PACKAGE 10-LEAD PLASTIC MSOP DD PACKAGE T = 150C, = 40C/W JMAX JA 10-LEAD (3mm 3mm) PLASTIC DFN EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB T = 125C, = 43C/W JMAX JA EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3757EDD PBF LT3757EDD TRPBF LDYW 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LT3757IDD PBF LT3757IDD TRPBF LDYW 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LT3757EMSE PBF LT3757EMSE TRPBF LTDYX 10-Lead (3mm 3mm) Plastic MSOP 40C to 125C LT3757IMSE PBF LT3757IMSE TRPBF LTDYX 10-Lead (3mm 3mm) Plastic MSOP 40C to 125C LT3757HMSE PBF LT3757HMSE TRPBF LTDYX 10-Lead (3mm 3mm) Plastic MSOP 40C to 150C LT3757MPMSE PBF LT3757MPMSE TRPBF LTDYX 10-Lead (3mm 3mm) Plastic MSOP 55C to 150C LT3757AEDD PBF LT3757AEDD TRPBF LGGR 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LT3757AIDD PBF LT3757AIDD TRPBF LGGR 10-Lead (3mm 3mm) Plastic DFN 40C to 125C LT3757AEMSE PBF LT3757AEMSE TRPBF LTGGM 10-Lead (3mm 3mm) Plastic MSOP 40C to 125C LT3757AIMSE PBF LT3757AIMSE TRPBF LTGGM 10-Lead (3mm 3mm) Plastic MSOP 40C to 125C LT3757AHMSE PBF LT3757AHMSE TRPBF LTGGM 10-Lead (3mm 3mm) Plastic MSOP 40C to 150C LT3757AMPMSE PBF LT3757AMPMSE TRPBF LTGGM 10-Lead (3mm 3mm) Plastic MSOP 55C to 150C Rev. G 2 For more information www.analog.com