LT3759 Wide Input Voltage Range Boost/SEPIC/Inverting Controller FEATURES DESCRIPTION n Wide V Range: 1.6V to 42V The LT 3759 is a wide input range, current mode, DC/DC IN n Positive or Negative Output Voltage Programming controller which is capable of regulating either positive or with a Single Feedback Pin negative output voltages from a single feedback pin. It can n PGOOD Output Voltage Status Report be configured as a boost, SEPIC or inverting converter. n Accurate 50mV SENSE Threshold Voltage The LT3759 drives a low side external N-channel power n Programmable Soft-Start MOSFET. An internal LDO regulator draws power from n Programmable Operating Frequency (100kHz to 1MHz) V or DRIVE to provide up to a 4.75V supply for the gate IN with One External Resistor driver. 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. The operating frequency of LT3759 n INTV Regulator Supplied from V or DRIVE CC IN can be set over a 100kHz to 1MHz range with an external n Programmable Input Undervoltage Lockout with resistor, or can be synchronized to an external clock using Hysteresis the SYNC pin. APPLICATIONS The LT3759 features soft-start and frequency foldback functions to limit inductor current during start-up and n Datacom and Industrial Boost, SEPIC and Inverting output short-circuit. A window comparator on the FBX pin Converters reports via the PGOOD pin, providing output voltage status n Distributed Power Supplies indication. The device is available in a 12-Lead exposed n Portable Electronic Equipment pad MSOP package. n Automotive L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and ThinSOT and No R are trademarks of Linear Technology Corporation. All other trademarks SENSE are the property of their respective owners. Protected by U.S. Patents including 7825665. TYPICAL APPLICATION 2.5V to 36V Input, 12V Output SEPIC Converter Excellent for Automotive 12V Post Regulator Efficiency vs Output Current 4.7F 2 V L1A OUT 100 V 12V V = 12V IN IN 2.5V TO 0.5A, 2.5V V 8V IN 36V C IN 2A, 8V < V 36V IN 95 V 105k IN 4.7F C OUT1 4 L1B EN/UVLO GATE M1 10F 90 100k 118k SENSE LT3759 5m 85 PGOOD DRIVE TIE TO GND SYNC 80 IF NOT USED 105K RT C + OUT2 SS FBX 75 47F 41.2k 0 0.5 1 1.5 2 2.5 VC GND INTV CC 4 200kHz OUTPUT CURRENT (A) 3759 TA01b 0.1F 7.5k 15.8K 22nF 4.7F 3759 TA01a 3759fc 1 For more information www.linear.com/3759 EFFICIENCY (%)LT3759 ABSOLUTE MAXIMUM RATINGS (Note 1) V ............................................................................42V RT ............................................................................1.5V IN EN/UVLO (Note 2) .....................................................42V SENSE ....................................................................0.3V DRIVE .......................................................................42V FBX ................................................................. 3V to 3V PGOOD ......................................................................42V Operating Junction Temperature Range (Note 4) INTV ........................................................................8V LT3759E/LT3759I .............................. 40C to 125C CC GATE .................................................................. (Note 3) LT3759H ............................................ 40C to 150C SYNC ..........................................................................8V Storage Temperature Range .................. 65C to 150C VC, SS .........................................................................3V PIN CONFIGURATION TOP VIEW VC 1 12 EN/UVLO FBX 2 11 V IN 13 SS 3 10 DRIVE GND RT 4 9 INTV CC 5 SYNC 8 GATE 6 PGOOD 7 SENSE MSE PACKAGE 12-LEAD PLASTIC MSOP = 35C/W TO 40C/W JA EXPOSED PAD (PIN 13) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LT3759EMSE PBF LT3759EMSE TRPBF 3759 12-Lead Plastic MSOP 40C to 125C LT3759IMSE PBF LT3759IMSE TRPBF 3759 12-Lead Plastic MSOP 40C to 125C LT3759HMSE PBF LT3759HMSE TRPBF 3759 12-Lead Plastic MSOP 40C to 150C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based finish parts. For more information on lead free part marking, go to: