DESCRIPTION
The LTe3430/LT3430-1 are monolithic buck switching regulators that accept input voltages up to 60V.A high efficiency 3A,0.12 switch is included on the die along with all the necessary oscillator, control and logic circuitry.A currentmode architecture provides fastransient response and excellent loop stability.
Specialdesign 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 30uA 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 areavailableinathermally enhanced 16-pin TSSOP package.
FERTURES
■Wide Input Range:5.5V to 60V
■3A Peak Switch Current over All Duty Cycles
■Constant Switching Frequency:
200KHz(LT3430)
100kHz(LT3430-1)
■0.12 Switch Resistance
■Current Mode Effective Supply Current:2.5mA
■Shutdown Current:30uA
■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
Feature
- Wide Input Range: 5.5V to 60V
- 3A Peak Switch Current over All Duty Cycles
- Constant Switching Frequency:
- 200kHz (LT3430)
- 100kHz (LT3430-1)
- 0.1Ω 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
(Picture: Pinout)
