LT3430 Datasheet | Linear Technology

Features - - - .. LT3430/LT3430-1 High Voltage, 3A, 200k Hz/100k Hz Step-Down Switching Regulators DESCRIPTION - - - - - - - - Wide Input Range: 5.5V to 60V 3A Peak Switch Current over All Duty Cycles Constant Switching Frequency: 200k Hz (LT3430) 100k Hz (LT3430-1) 0.1Ω Switch Resistance Current Mode Effective Supply Current: 2.5m A Shutdown Current: 30µA 1.2V Feedback Reference Voltage Easily Synchronizable Cycle-by-Cycle Current Limiting Small, 16-Pin Thermally Enhanced TSSOP Package The LT®3430/LT3430-1 are monolithic buck switching regulators that accept 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 excellent 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 a SYNC pin can be externally synchronized with a logic level input from 228k Hz to 700k Hz for the LT3430 or from 125k Hz to 250k Hz for the LT3430-1. The LT3430/LT3430-1 are available in a thermally enhanced 16-pin TSSOP package. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. - US Patent # 6498466 APPLICATIONS - - - - Industrial and Automotive Power Supplies Portable puters Battery Chargers Distributed Power Systems TYPICAL APPLICATION 5V, 2A Buck Converter MMSD914TI Efficiency vs Load Current 100 VOUT = 5V VIN = 12V VIN 4.7µF 100V OFF ON LT3430- - SHDN SYNC GND SW 30BQ060 EFFICIENCY (%) VIN 5.5V- TO 60V BOOST 0.68µF 22µH VOUT 5V 2A VIN =...