LT1956 Datasheet | Linear Technology

LT1956/LT1956-5 High Voltage, 1.5A, 500k Hz Step-Down Switching Regulators Features s s s DESCRIPTIO s s s s s s s s s Wide Input Range: 5.5V to 60V 1.5A Peak Switch Current Small 16-Pin SSOP or Thermally Enhanced TSSOP Package Saturating Switch Design: 0.2Ω Peak Switch Current Maintained Over Full Duty Cycle Range Constant 500k Hz Switching Frequency Effective Supply Current: 2.5m A Shutdown Current: 25µA 1.2V Feedback Reference (LT1956) 5V Fixed Output (LT1956-5) Easily Synchronizable Cycle-by-Cycle Current Limiting The LT ®1956/LT1956-5 are 500k Hz monolithic buck switching regulators with an input voltage capability up to 60V. A high efficiency 1.5A, 0.2Ω 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 25µA and the device can be externally synchronized from 580k Hz to 700k Hz with a logic level input. The LT1956/LT1956-5 are available in fused-lead 16-pin SSOP and thermally enhanced TSSOP packages. , LTC and LT are registered trademarks of Linear Technology Corporation. - U.S. PATENT NO. 6,498,466 U APPLICATIO S s s s s s High Voltage, Industrial and Automotive Portable puters Battery-Powered Systems Battery Chargers Distributed Power Systems TYPICAL APPLICATIO 5V Buck Converter MMSD914TI 6 VIN 12V (TRANSIENTS TO 60V) BOOST 4 2.2µF† 100V CERAMIC 15 14 VIN LT1956-5 SHDN SYNC GND BIAS FB VC 10 12 SW 2 0.1µF 10µH VOUT 5V 1A 22µF 6.3V CERAMIC 10MQ060N EFFICIENCY (%) 1, 8, 9, 16 11 220p F 4.7k 4700p F † UNITED CHEMI-CON...