The LT1956/LT1956-5 are 500kHz monolithic buck switching regulators with an input voltage capability up to 60V. A high efficiency 1.5A, 0.2Ω 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 25µA and the device can be externally synchronized from 580kHz to 700kHz with a logic level input.
The LT1956/LT1956-5 are available in fused-lead 16-pin SSOP and thermally enhanced TSSOP packages.
Feature
- Wide Input Range: 5.5V to 60V
- 1.5A Peak Switch Current
- Small 16-Pin SSOP Package or Thermally Enhanced TSSOP Package
- Saturating Switch Design: 0.2Ω
- Peak Switch Current Maintained Over Full Duty Cycle Range
- Constant 500kHz Switching Frequency
- Effective Supply Current: 2.5mA
- Shutdown Current: 25µA
- 1.2V Feedback Reference (LT1956)
- 5V Fixed Output (LT1956-5)
- Easily Synchronizable
- Cycle-by-Cycle Current Limiting
Applications
- High Voltage, Industrial and Automotive
- Portable Computers
- Battery-Powered Systems
- Battery Chargers
- Distributed Power Systems
(Picture: Pinout)
