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LTC7138 - High Efficiency, 140V 400mA Step-Down Regulator

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.

Features 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 Typical Application

Applications Industrial Control Supplies Medical Devices Distributed Power Systems Portable Instruments Battery-Operated Devices Avionics Automotive Packaging

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