DC/DC step-down switching regulator, 5.5 ... 60 Vin, 3 A, 200 KH

High Voltage, 3A, 200kHz Step-Down Switching Regulators

Description:
The LT®3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V. A high efficiency 3A, 0.1O 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 effi ciency 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)
- 0.1O 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

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