DatasheetsPDF.com

LTC7138 Dataheets PDF



Part Number LTC7138
Manufacturers Linear Technology
Logo Linear Technology
Description 140V 400mA Step-Down Regulator
Datasheet LTC7138 DatasheetLTC7138 Datasheet (PDF)

Features n Wide Operating Input Voltage Range: 4V to 140V n Internal Low Resistance Power MOSFET n No Compensation Required n Adjustable 100mA to 400mA Maximum Output Current n Low Dropout Operation: 100% Duty Cycle n Low Quiescent Current: 12µA n Wide Output Range: 0.8V to VIN n 0.8V ±1% Feedback Voltage Reference n Precise RUN Pin Threshold n Internal or External Soft-Start n Programmable 1.8V, 3.3V, 5V or Adjustable Output n Few External Components Required n Programmable Input O.

  LTC7138   LTC7138



Document
Features n Wide Operating Input Voltage Range: 4V to 140V n Internal Low Resistance Power MOSFET n No Compensation Required n Adjustable 100mA to 400mA Maximum Output Current n Low Dropout Operation: 100% Duty Cycle n Low Quiescent Current: 12µA n Wide Output Range: 0.8V to VIN n 0.8V ±1% Feedback Voltage Reference n Precise RUN Pin Threshold n Internal or External Soft-Start n Programmable 1.8V, 3.3V, 5V or Adjustable Output n Few External Components Required n Programmable Input Overvoltage Lockout n Thermally Enhanced High Voltage MSOP Package Applications n Industrial Control Supplies n Medical Devices n Distributed Power Systems n Portable Instruments n Battery-Operated Devices n Avionics n Automotive LTC7138 High Efficiency, 140V 400mA Step-Down Regulator Description The LTC®7138 is a high efficiency step-down DC/DC regulator with internal power switch that draws only 12μA typical DC supply current while maintaining a regulated output voltage at no load. The LTC7138 can supply up to 400mA load current and features a programmable peak current limit that provides a simple method for optimizing efficiency and for reducing output ripple and component size. The LTC7138’s combination of Burst Mode® operation, integrated power switch, low quiescent current, and programmable peak current limit provides high efficiency over a broad range of load currents. With its wide input range of 4V to 140V and programmable overvoltage lockout, the LTC7138 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC7138 includes a precise run threshold and soft-start feature to guarantee that the power system start-up is well-controlled in any environment. A feedback comparator output enables multiple LTC7138s to be connected in parallel for higher current applications. The LTC7138 is available in a thermally enhanced high voltage-capable 16-lead MSE package with four missing pins. L, LT, LTC, LTM, Burst Mode, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Typical Application 5V to 140V Input to 5V Output, 400mA Step-Down Regulator VIN 5V TO 140V CIN 1µF 250V VIN SW LTC7138 RUN ANODE SS VPRG1 VFB VPRG2 OVLO GND L1 220µH VOUT 5V COUT 400mA 22µF 7138 TA01a EFFICIENCY (%) Efficiency and Power Loss vs Load Current 100 90 EFFICIENCY 80 70 60 1000 50 40 POWER LOSS 100 30 20 10 0 0.1 VIN = 12V 10 VIN = 48V VIN = 140V 1 1 10 100 1000 LOAD CURRENT (mA) 7138 TA01b For more information www.linear.com/LTC7138 POWER LOSS (mW) 7138f 1 LTC7138 Absolute Maximum Ratings (Note 1) VIN Supply Voltage.................................... –0.3V to 140V RUN Voltage............................................. –0.3V to 140V SS, FBO, OVLO, ISET Voltages....................... –0.3V to 6V VFB, VPRG1, VPRG2 Voltages.......................... –0.3V to 6V Operating Junction Temperature.


FP5502 LTC7138 HZC336M025C12T-F


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)