POWER LOSS (mW) LTC3637 76V, 1A Step-Down Regulator FEATURES DESCRIPTION n Wide Operating Input Voltage Range: 4V to 76V The LTC 3637 is a high efficiency step-down DC/DC n Internal 350m Power MOSFET regulator with an internal high side power switch that n No Compensation Required draws only 12A DC supply current while maintaining a n Adjustable 100mA to 1A Maximum Output Current regulated output voltage at no load. n Low Dropout Operation: 100% Duty Cycle The LTC3637 can supply up to 1A load current and features n Low Quiescent Current: 12A a programmable peak current limit that provides a simple n Wide Output Range: 0.8V to V IN method for optimizing efficiency and for reducing output n 0.8V 1% Feedback Voltage Reference ripple and component size. The LTC3637s combination n Precise RUN Pin Threshold of Burst Mode operation, integrated power switch, low n Internal and External Soft-Start quiescent current, and programmable peak current limit n Programmable 1.8V, 3.3V, 5V or Adjustable Output provides high efficiency over a broad range of load currents. n Few External Components Required n With its wide input range of 4V to 76V, and programmable Programmable Input Overvoltage Lockout n overvoltage lockout, the LTC3637 is a robust regulator Low Profile (0.75mm) 3mm 5mm DFN and suited for regulating from a wide variety of power sources. Thermally-Enhanced MSE16 Packages Additionally, the LTC3637 includes a precise run threshold and soft-start feature to guarantee that the power system APPLICATIONS start-up is well-controlled in any environment. n Industrial Control Supplies The LTC3637 is available in the thermally-enhanced n Medical Devices 3mm 5mm DFN and the MSE16 packages. n Distributed Power Systems n L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks Portable Instruments of Linear Technology Corporation. All other trademarks are the property of their respective n Battery-Operated Devices owners. n Automotive n Avionics TYPICAL APPLICATION Efficiency and Power Loss vs Load Current 100 12.5V to 76V Input to 12V Output, 1A Regulator V = 12V OUT EFFICIENCY 90 10H V 80 OUT V IN 12V V SW IN 12.5V TO 76V 70 1A 47F 2.2F 200k LTC3637 60 1000 RUN V FB 50 SS 35.7k 40 POWER LOSS 100 FBO V PRG1 30 V PRG2 OVLO I SET 20 10 V = 24V IN GND V = 48V 10 IN V = 76V 3637 TA01a IN 0 0 0.1 1.0 10 100 1000 LOAD CURRENT (mA) 3637 TA01b 3637fa 1 For more information www.linear.com/LTC3637 EFFICIENCY (%)LTC3637 ABSOLUTE MAXIMUM RATINGS (Note 1) V Supply Voltage ..................................... 0.3V to 80V Storage Temperature Range .................. 65C to 150C IN RUN Voltage............................................... 0.3V to 80V Lead Temperature (Soldering, 10 sec) SS, FBO, I Voltages ................................. 0.3V to 6V MSOP ...............................................................300C SET V , V , V , OVLO Voltages .............. 0.3V to 6V FB PRG1 PRG2 Operating Junction Temperature Range (Notes 2, 3, 4) LTC3637E, LTC3637I ......................... 40C to 125C LTC3637H .......................................... 40C to 150C LTC3637MP ....................................... 55C to 150C PIN CONFIGURATION TOP VIEW SW 1 16 GND TOP VIEW NC 2 15 NC SW 1 16 GND V 3 14 RUN IN V 3 14 RUN IN NC 4 13 NC 17 17 FBO 5 GND 12 OVLO GND FBO 5 12 OVLO 6 V 11 I PRG2 SET V 7 10 SS V 6 11 I PRG1 PRG2 SET 8 GND 9 V FB V 7 10 SS PRG1 MSE PACKAGE GND 8 9 V VARIATION: MSE16 (12) FB 16-LEAD PLASTIC MSOP T = 150C, = 45C/W, = 10C/W DHC PACKAGE JMAX JA JC EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB 16-LEAD (5mm 3mm) PLASTIC DFN (NOTE 6) T = 150C, = 43C/W, = 5C/W JMAX JA JC EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3637EMSE PBF LTC3637EMSE TRPBF 3637 16-Lead Plastic MSOP 40C to 125C LTC3637IMSE PBF LTC3637IMSE TRPBF 3637 16-Lead Plastic MSOP 40C to 125C LTC3637HMSE PBF LTC3637HMSE TRPBF 3637 16-Lead Plastic MSOP 40C to 150C LTC3637MPMSE PBF LTC3637MPMSE TRPBF 3637 16-Lead Plastic MSOP 55C to 150C LTC3637EDHC PBF LTC3637EDHC TRPBF 3637 16-Lead (5mm 3mm) Plastic DFN 40C to 125C LTC3637IDHC PBF LTC3637IDHC TRPBF 3637 16-Lead (5mm 3mm) Plastic DFN 40C to 125C LTC3637HDHC PBF LTC3637HDHC TRPBF 3637 16-Lead (5mm 3mm) Plastic DFN 40C to 150C LTC3637MPDHC PBF LTC3637MPDHC TRPBF 3637 55C to 150C 16-Lead (5mm 3mm) Plastic DFN 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: