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SC4524 Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4524 Datasheet(HTML) 1 Page - Semtech Corporation |
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1 / 21 page  1 www.semtech.com SC4524 Programmable Frequency, 2A Output 30V Step-Down Switching Regulator POWER MANAGEMENT Revision: December 30th, 2006 Description Features Applications Typical Application Circuit u Up to 1.5 MHz Programmable Switching Frequency u 2.3A Integrated Switch u Wide Input Voltage Range 2.8V to 30V u Peak Current-Mode Control with Cycle-by-Cycle Current Limiting u Hiccup Overload Protection u Soft-Start and Enable u Thermal Shutdown u Thermally Enhanced 8-Pin SOIC Package u Fully WEEE and RoHS Compliant The SC4524 is an adjustable frequency peak current- mode step-down switching regulator with an integrated 2.3A, 30V switch. The SC4524 can be programmed up to 1.5MHz. This allows the use of small inductor and ceramic capacitors, resulting in very compact power supplies. The SC4524 is suitable for next generation XDSL modems, set-top boxes and point of load applications. The SC4524 uses peak current-mode PWM control for ease of compensation. Cycle-by-cycle current limit and hiccup overload protection reduce power dissipation during overload. Combined soft start and enable pin not only eliminates output start up overshoot but also allows power sequencing. The SC4524 is available in SOIC-8 EDP package. u XDSL and Cable Modems u Set-top Boxes u Point of Load Applications u CPE Equipment u DSP Power Supplies u Disk Drives SC4524 GND IN SW BST L1 4.7 mH C2 0.1 mF SS COMP FB D2 20BQ030 5.49k R2 R1 22.1k 22nF C6 22pF R5 15.4k C5 470pF L1: Coiltronics FP3-4R7 OUT 5V/2A D1 1N4148 24V ROSC C1: Murata GRM21BR60J226M C3 10 mF 17.4k R3 C7 C3: Murata GRM32ER71H106K V IN C1 22 mF Efficiency 50 55 60 65 70 75 80 85 90 0.0 0.5 1.0 1.5 2.0 Load Current (A) Figure 1. 1MHz 24V to 5V/2A Step-down Converter. |
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