High Efficiency, 140V 400mA Step-Down Regulator with PassThru

The LTC7138 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.

Applications

* Industrial Control Supplies

* Medical Devices

* Distributed Power Systems

* Portable Instruments

* Battery-Operated Devices

* Avionics

* Automotive

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