LT3431 Datasheet | Linear Technology

LT3431 High Voltage, 3A, 500k Hz Step-Down Switching Regulator .. Features s s s s s s DESCRIPTIO s s s s s Wide Input Range: 5.5V to 60V 3A Peak Switch Current Small Thermally Enhanced 16-Pin TSSOP Package Constant 500k Hz Switching Frequency Saturating Switch Design: 0.1Ω Peak Switch Current Maintained Over Full Duty Cycle Range Effective Supply Current: 2.5m A Shutdown Current: 30µA 1.2V Feedback Reference Voltage Easily Synchronizable Cycle-by-Cycle Current Limiting The LT ®3431 is a 500k Hz monolithic buck switching regulator that accepts 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 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 30µA and the device can be externally synchronized from 580k Hz to 700k Hz with logic level inputs. The LT3431 is available in a thermally enhanced 16-pin TSSOP package. , LTC and LT are registered trademarks of Linear Technology Corporation. U APPLICATIO S s s s s Industrial and Automotive Power Supplies Portable puters Battery Chargers Distributed Power Systems TYPICAL APPLICATIO 5V, 2A Buck Converter 6 VIN 12V (TRANSIENTS TO 60V) BOOST 3, 4 2.2µF† 100V CERAMIC 15 14 VIN LT3431 SHDN SYNC GND 1, 8, 9, 16 1.5k 15n F BIAS FB VC 11 220p F 10 12 SW 2, 5 30BQ060 0.22µF MMSD914TI 10µH- - VOUT 5V 2A 47µF CERAMIC 15.4k 4.99k EFFICIENCY (%) - - INCREASE INDUCTOR VALUE FOR LOAD CURRENTS ABOVE 2A (SEE APPLICATIONS INFORMATION- MAXIMUM OUTPUT LOAD CURRENT) † UNITED CHEMI-CON...