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LTC3638 - High Efficiency, 140V 250mA Step-Down Regulator

The LTC®3638 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 LTC3638 can supply up to 250mA 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 LTC3638’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 LTC3638 is a robust regulator suited for regulating from a wide variety of power sources. Additionally, the LTC3638 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 LTC3638s to be connected in parallel for higher current applications.

The LTC3638 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 20mA to 250mA 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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