POWER LOSS (mW) LTC3639 High Efficiency, 150V 100mA Synchronous Step-Down Regulator FEATURES DESCRIPTION n Wide Operating Input Voltage Range: 4V to 150V The LTC 3639 is a high efficiency step-down DC/DC n Synchronous Operation for Highest Efficiency regulator with internal high side and synchronous power n Internal High Side and Low Side Power MOSFETs switches that draws only 12A typical DC supply current n No Compensation Required while maintaining a regulated output voltage at no load. n Adjustable 10mA to 100mA Maximum Output The LTC3639 can supply up to 100mA load current and Current features a programmable peak current limit that provides n Low Dropout Operation: 100% Duty Cycle a simple method for optimizing efficiency and for reduc- n Low Quiescent Current: 12A ing output ripple and component size. The LTC3639s n Wide Output Range: 0.8V to V IN combination of Burst Mode operation, integrated power n 0.8V 1% Feedback Voltage Reference switches, low quiescent current, and programmable peak n Precise RUN Pin Threshold current limit provides high efficiency over a broad range n Internal or External Soft-Start of load currents. n Programmable 1.8V, 3.3V, 5V or Adjustable Output n With its wide input range of 4V to 150V and programmable Few External Components Required n overvoltage lockout, the LTC3639 is a robust regulator Programmable Input Overvoltage Lockout n suited for regulating from a wide variety of power sources. Thermally Enhanced High Voltage MSOP Package Additionally, the LTC3639 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 LTC3639 is available in a thermally enhanced high n Medical Devices voltage-capable 16-lead MSE package with four missing pins. n Distributed Power Systems L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks n Portable Instruments of Linear Technology Corporation. All other trademarks are the property of their respective n owners. Battery-Operated Devices n Automotive n Avionics TYPICAL APPLICATION Efficiency and Power Loss vs Load Current 100 V = 5V OUT EFFICIENCY 90 5V to 150V Input to 5V Output, 100mA Step-Down Regulator 80 70 1000 470H V OUT V IN V = 12V V SW 5V IN IN 60 5V TO 150V 1F V = 36V 100mA IN 10F LTC3639 200V V = 72V IN 50 100 RUN V FB V = 150V IN 40 OVLO SS POWER LOSS V V 30 10 PRG2 PRG1 GND 20 3639 TA01a 10 1 0 0.1 1 10 100 LOAD CURRENT (mA) 3639 TA01b 3639fc 1 For more information www.linear.com/LTC3639 EFFICIENCY (%)LTC3639 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW V Supply Voltage ................................... 0.3V to 150V IN SW 1 16 GND RUN Voltage............................................. 0.3V to 150V V 3 14 RUN IN 17 SS, FBO, OVLO, I Voltages ...................... 0.3V to 6V SET FBO 5 GND 12 OVLO 6 V 11 I V , V , V Voltages ......................... 0.3V to 6V PRG2 SET FB PRG1 PRG2 V 7 10 SS PRG1 8 Operating Junction Temperature Range (Notes 2, 3) GND 9 V FB MSE PACKAGE LTC3639E, LTC3639I ......................... 40C to 125C VARIATION: MSE16 (12) LTC3639H .......................................... 40C to 150C 16-LEAD PLASTIC MSOP T = 150C, = 40C/W, = 10C/W JMAX JA JC LTC3639MP ....................................... 55C to 150C EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB Storage Temperature Range .................. 65C to 150C Lead Temperature (Soldering, 10 sec) ...................300C ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC3639EMSE PBF LTC3639EMSE TRPBF 3639 16-Lead Plastic MSOP 40C to 125C LTC3639IMSE PBF LTC3639IMSE TRPBF 3639 16-Lead Plastic MSOP 40C to 125C LTC3639HMSE PBF LTC3639HMSE TRPBF 3639 16-Lead Plastic MSOP 40C to 150C LTC3639MPMSE PBF LTC3639MPMSE TRPBF 3639 16-Lead Plastic MSOP 55C 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: