特点
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
典型应用
典型应用
描述
The LT?3431 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.