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LT3430 - High Voltage, 3A, 200kHz Step-Down Switching Regulator

The LT3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 3A, 0.1Ω 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 excellent 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 a SYNC pin can be externally synchronized with a logic level input from 228kHz to 700kHz for the LT3430 or from 125kHz to 250kHz for the LT3430-1.

The LT3430/LT3430-1 are available in a thermally enhanced 16-pin TSSOP package.

Features Wide Input Range: 5.5V to 60V 3A Peak Switch Current over All Duty Cycles Constant Switching Frequency: 200kHz (LT3430) 100kHz (LT3430-1) 0.1Ω Switch Resistance Current Mode Effective Supply Current: 2.5mA Shutdown Current: 30µA 1.2V Feedback Reference Voltage Easily Synchronizable Cycle-by-Cycle Current Limiting Small, 16-Pin Thermally Enhanced TSSOP Package Typical Application

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

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