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SC4524B Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4524B Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 18 page  POWER MANAGEMENT June 2, 2008 18V 2A Step-Down Switching Regulator SC4524B Typical Application Circuit Features Wide input range: 3V to 8V 2A Output Current 200kHz to 2MHz Programmable Frequency Precision V Feedback Voltage Peak Current-Mode Control Cycle-by-Cycle Current Limiting Hiccup Overload Protection with Frequency Foldback Soft-Start and Enable Thermal Shutdown Thermally Enhanced 8-pin SOIC Package Fully RoHS and WEEE compliant Applications XDSL and Cable Modems Set Top Boxes Point of Load Applications CPE Equipment DSP Power Supplies LCD and Plasma TVs Description The SC4524B is a constant frequency peak current-mode step-down switching regulator capable of producing 2A output current from an input ranging from 3V to 8V. The switching frequency of the SC4524B is programmable up to 2MHz, allowing the use of small inductors and ceramic capacitors for miniaturization, and high input/ output conversion ratio. The SC4524B is suitable for next generation XDSL modems, high-definition TVs and various point of load applications. Peak current-mode PWM control employed in the SC4524B achieves fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduces power dissipation during output overload. Soft-start function reduces input start- up current and prevents the output from overshooting during power-up. The SC4524B is available in SOIC-8 EDP package. Figure 1. 1MHz 10V-16V to 5V/2A Step-down Converter Efficiency 40 45 50 55 60 65 70 75 80 85 90 0 0.5 1 1.5 2 Load Current (A) SS270 REV 4 VIN = 12V SC4524B GND IN SW BST L1 6.8mH C1 0.1mF SS/EN COMP FB D2 20BQ030 25.5k R6 102k 10nF C8 10pF C5 1nF L1: Wurth 744 778 9006 OUT 5V/2A D1 1N4148 10V – 16V ROSC C2: Murata GRM31CR60J226K C4 2.2mF C4: Murata GRM31CR61E225K VIN C2 22mF C7 R4 18.2k R5 30.1k R7 |
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