POWER LOSS (mW) LTC7138 High Efficiency, 140V 400mA Step-Down Regulator Fea T Descrip T n Wide Operating Input Voltage Range: 4V to 140V The LTC 7138 is a high efficiency step-down DC/DC n Internal Low Resistance Power MOSFET regulator with internal power switch that draws only 12A n No Compensation Required typical DC supply current while maintaining a regulated n Adjustable 100mA to 400mA Maximum Output output voltage at no load. Current The LTC7138 can supply up to 400mA load current and n Low Dropout Operation: 100% Duty Cycle features a programmable peak current limit that provides n Low Quiescent Current: 12A a simple method for optimizing efficiency and for reduc- n Wide Output Range: 0.8V to V IN ing output ripple and component size. The LTC7138s n 0.8V 1% Feedback Voltage Reference combination of Burst Mode operation, integrated power n Precise RUN Pin Threshold switch, low quiescent current, and programmable peak n Internal or External Soft-Start current limit provides high efficiency over a broad range n Programmable 1.8V, 3.3V, 5V or Adjustable Output of load currents. n Few External Components Required n With its wide input range of 4V to 140V and programmable Programmable Input Overvoltage Lockout n overvoltage lockout, the LTC7138 is a robust regulator Thermally Enhanced High Voltage MSOP Package suited for regulating from a wide variety of power sources. Additionally, the LTC7138 includes a precise run threshold a T and soft-start feature to guarantee that the power system n Industrial Control Supplies start-up is well-controlled in any environment. A feedback n Medical Devices comparator output enables multiple LTC7138s to be con- n Distributed Power Systems nected in parallel for higher current applications. n Portable Instruments The LTC7138 is available in a thermally enhanced high n Battery-Operated Devices voltage-capable 16-lead MSE package with four missing pins. n Avionics L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks n Automotive of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical a T Efficiency and Power Loss vs Load Current 100 EFFICIENCY 5V to 140V Input to 5V Output, 400mA Step-Down Regulator 90 80 L1 220H 70 V V IN OUT V SW IN 5V TO 140V 5V 60 1000 C IN LTC7138 400mA C OUT 1F 50 ANODE 22F RUN 250V 40 POWER LOSS 100 SS V V PRG1 FB 30 V OVLO PRG2 20 10 GND V = 12V IN V = 48V 10 7138 TA01a IN V = 140V IN 0 1 0.1 1 10 100 1000 LOAD CURRENT (mA) 7138 TA01b 7138f 1 For more information www.linear.com/LTC7138 EFFICIENCY (%) ion pplica ions pplica ion uresLTC7138 a Te Maxi Mu M r a T p in c F T (Note 1) TOP VIEW V Supply Voltage ................................... 0.3V to 140V IN SW 1 16 ANODE RUN Voltage............................................. 0.3V to 140V 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, 4) GND 9 V FB MSE PACKAGE LTC7138E, LTC7138I .......................... 40C to 125C VARIATION: MSE16 (12) LTC7138H .......................................... 40C to 150C 16-LEAD PLASTIC MSOP T = 150C, = 40C/W, = 10C/W JMAX JA JC LTC7138MP ....................................... 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 o r Der i n F Ma T LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC7138EMSE PBF LTC7138EMSE TRPBF 7138 16-Lead Plastic MSOP 40C to 125C LTC7138IMSE PBF LTC7138IMSE TRPBF 7138 16-Lead Plastic MSOP 40C to 125C LTC7138HMSE PBF LTC7138HMSE TRPBF 7138 16-Lead Plastic MSOP 40C to 150C LTC7138MPMSE PBF LTC7138MPMSE TRPBF 7138 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: