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LT1956IFE-5 Datasheet(PDF) 1 Page - Linear Technology |
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LT1956IFE-5 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 28 page  1 LT1956/LT1956-5 1956f High Voltage, 1.5A, 500kHz Step-Down Switching Regulators s Wide Input Range: 5.5V to 60V s 1.5A Peak Switch Current s Small 16-Pin SSOP or Thermally Enhanced TSSOP Package s Saturating Switch Design: 0.2 Ω s Peak Switch Current Maintained Over Full Duty Cycle Range s Constant 500kHz Switching Frequency s Effective Supply Current: 2.5mA s Shutdown Current: 25 µA s 1.2V Feedback Reference (LT1956) s 5V Fixed Output (LT1956-5) s Easily Synchronizable s Cycle-by-Cycle Current Limiting The LT ®1956/LT1956-5 are 500kHz monolithic buck switching regulators with an input voltage capability up to 60V. A high efficiency 1.5A, 0.2 Ω switch is included on the die along with all the necessary oscillator, control and logic circuitry. A current mode architecture provides fast tran- sient 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 25 µAand the device can be externally synchronized from 580kHz to 700kHz with a logic level input. The LT1956/LT1956-5 are available in fused-lead 16-pin SSOP and thermally enhanced TSSOP packages. s High Voltage, Industrial and Automotive s Portable Computers s Battery-Powered Systems s Battery Chargers s Distributed Power Systems , LTC and LT are registered trademarks of Linear Technology Corporation. 5V Buck Converter Efficiency vs Load Current BOOST VIN 6 2 10 12 10MQ060N VOUT 5V 1A 4 15 14 11 220pF 4700pF †UNITED CHEMI-CON THCS50EZA225ZT 1, 8, 9, 16 LT1956-5 SHDN SYNC SW BIAS FB VC GND 0.1 µF 22 µF 6.3V CERAMIC 10 µH MMSD914TI 1956 TA01 2.2 µF† 100V CERAMIC VIN 12V (TRANSIENTS TO 60V) 4.7k LOAD CURRENT (A) 0 80 90 100 1.00 1956 TA02 70 60 50 0.25 0.50 0.75 1.25 VOUT = 5V VOUT = 3.3V VIN = 12V L = 18 µH DESCRIPTIO FEATURES APPLICATIO S TYPICAL APPLICATIO *U.S. PATENT NO. 6,498,466 |
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