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LT3431 - High Voltage, 3A, 500kHz Step-Down Switching Regulator

The LT3431 is a 500kHz monolithic buck switching regulator that accepts input voltages up to 60V. A high efficiency 3A, 0.1 Ohm switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast transient response and good loop stability.

Special design techniques and a new high voltage process achieve high efficiency over a wide input range. Efficiency is maintained over a wide output current range by using the output to bias the circuitry and by utilizing a supply boost capacitor to saturate the power switch. Patented circuitry maintains peak switch current over the full duty cycle range. A shutdown pin reduces supply current to 30µA and the device can be externally synchronized from 580kHz to 700kHz with logic level inputs.

The LT3431 is available in a thermally enhanced 16-pin TSSOP package.

Features Wide Input Range: 5.5V to 60V 3A Peak Switch Current Small Thermally Enhanced 16-Pin TSSOP Package Constant 500kHz Switching Frequency Saturating Switch Design: 0.1 Ohm Peak Switch Current Maintained Over Full Duty Cycle Range Effective Supply Current: 2.5mA Shutdown Current: 30µA 1.2V Feedback Reference Voltage Easily Synchronizable Cycle-by-Cycle Current Limiting Typical Application

Applications Industrial and Automotive Power Supplies Portable Computers Battery Chargers Distributed Power Systems Packaging

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