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LT1374IS8-5SYNC Datasheet(PDF) 1 Page - Linear Technology |
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LT1374IS8-5SYNC Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  1 LT1374 1374fb 4.5A, 500kHz Step-Down Switching Regulator s Constant 500kHz Switching Frequency s High Power 16-Pin TSSOP Package Available s Uses All Surface Mount Components s Inductor Size Reduced to 1.8 µH s Saturating Switch Design: 0.07 Ω s Effective Supply Current: 2.5mA s Shutdown Current: 20 µA s Cycle-by-Cycle Current Limiting s Easily Synchronizable The LT ®1374 is a 500kHz monolithic buck mode switching regulator. A 4.5A switch is included on the die along with all the necessary oscillator, control and logic circuitry. High switching frequency allows a considerable reduction in the size of external components. The topology is current mode for fast transient response and good loop stability. Both fixed output voltage and adjustable parts are available. A special high speed bipolar process and new design tech- niques achieve high efficiency at high switching frequency. 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. The LT1374 is available in standard 7-pin DD, TO-220, fused lead SO-8 and 16-pin exposed pad TSSOP packages. Full cycle-by-cycle short-circuit protection and thermal shut- down are provided. Standard surface mount external parts may be used, including the inductor and capacitors. There is the optional function of shutdown or synchronization. A shutdown signal reduces supply current to 20 µA.Synchro- nization allows an external logic level signal to increase the internal oscillator from 580kHz to 1MHz. , LTC and LT are registered trademarks of Linear Technology Corporation. 5V Buck Converter LOAD CURRENT (A) 0 100 95 90 85 80 75 70 2.0 2.5 3.0 3.5 1374 TA02 0.5 1.0 1.5 4.0 VOUT = 5V VIN = 10V L = 10 µH Efficiency vs Load Current BOOST LT1374-5 VIN SHDN OUTPUT** 5V, 4.25A * RIPPLE CURRENT RATING ≥ IOUT/2 ** INCREASE L1 TO 10 µH FOR LOAD CURRENTS ABOVE 3.5A AND TO 20µH ABOVE 4A SEE APPLICATIONS INFORMATION INPUT 6V TO 25V 1374 TA01 C2 0.27 µF CC 1.5nF D1 MBRS330T3 C1 100 µF, 10V SOLID TANTALUM C3* 10 µF TO 50 µF DEFAULT = ON D2 CMDSH3 OR FMMD914 L1** 5 µH VSW SENSE BIAS GND VC + + s Portable Computers s Battery-Powered Systems s Battery Chargers s Distributed Power FEATURES DESCRIPTIO APPLICATIO S TYPICAL APPLICATIO |
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