DESCRIPTION
The LT ®3430 is a 200kHz monolithic buck switching regulator that accepts input voltages up to 60V. A high efficiency 3A, 0.1Ωswitch 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 from 228kHz to 700kHz with a logic level input.
The LT3430 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 200kHz Switching Frequency
■ Saturating Switch Design: 0.1Ω
■ 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

APPLICATIONS
■ Industrial and Automotive Power Supplies
■ Portable Computers
■ Battery Chargers
■ Distributed Power Systems