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
