The LT3431IFE is a 500kHz monolithic buck switching regulator that accepts 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 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 LT3431IFE is available in a thermally enhanced 16-pin TSSOP package.
Feature
- 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: 0.1Ω
- 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
(Picture: Pinout)
