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LT1506IR-3.3 Datasheet(PDF) 1 Page - Linear Technology |
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LT1506IR-3.3 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 24 page  1 LT1506 4.5A, 500kHz Step-Down Switching Regulator s Constant 500kHz Switching Frequency s Easily Synchronizable s Operates with Input as Low as 4V s Uses All Surface Mount Components s Inductor Size Reduced to 1.8 µH s Saturating Switch Design: 0.07 Ω s Shutdown Current: 20 µA s Cycle-by-Cycle Current Limiting FEATURES The LT ®1506 is a 500kHz monolithic buck mode switching regulator functionally identical to the LT1374 but optimized for lower input voltage applications. It will operate over a 4V to 15V input range compared with 5.5V to 25V for the LT1374. 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 keeping quiescent supply current to 4mA and by utiliz- ing a supply boost capacitor to saturate the power switch. The LT1506 fits into standard 7-pin DD and fused lead SO-8 packages. Full cycle-by-cycle short-circuit protection and thermal shutdown are provided. Standard surface mount external parts are used, including the inductor and capacitors. There is the optional function of shutdown or synchronization. A shutdown signal reduces supply current to 20 µA.Synchronizationallowsanexternallogiclevelsig- nal to increase the internal oscillator from 580kHz to 1MHz. DESCRIPTION s Portable Computers s Battery-Powered Systems s Battery Charger s Distributed Power APPLICATIONS , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATION LOAD CURRENT (A) 0 90 85 80 75 70 2.0 2.5 3.0 3.5 1506 TA02 0.5 1.0 1.5 4.0 VOUT = 3.3V VIN = 5V L = 10 µH Efficiency vs Load Current 5V to 3.3V Down Converter BOOST LT1506-3.3 VIN OUTPUT 3.3V 4A INPUT 5V 1506 TA01 C2 0.68 µF CC 1.5nF D1 MBRS330T3 C1 100 µF, 10V SOLID TANTALUM C3 10 µF TO 50 µF CERAMIC D2 1N914 L1 5 µH VSW SENSE SHDN OPEN OR HIGH = ON GND VC + + |
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