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SC4525DSETRT Datasheet(PDF) 1 Page - Semtech Corporation |
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SC4525DSETRT Datasheet(HTML) 1 Page - Semtech Corporation |
1 / 21 page www.semtech.com POWER MANAGEMENT Jan. 13, 2011 1 18V, 3A, 350kHz Step-Down Switching Regulator SC4525D Typical Application Circuit Features Input range: 3V to 18V 3A Output Current 350kHz Fixed Switching Frequency Precision 1V 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 SC4525D is a 350kHz constant frequency peak current-mode step-down switching regulator capable of producing 3A output current from an input ranging from 3V to 18V. The SC4525D is suitable for next generation XDSL modems, high-definition TVs and various point of load applications. Peak current-mode PWM control employed in the SC4525Dachievesfasttransientresponsewithsimpleloop 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 SC4525D is available in SOIC-8 EDP package. Figure 1. 350kHz 10V -16V to 5V/3A Step-down Converter Efficiency of the 1MHz 10V-28V to 5V/3A Step-Down Converter (Front Page) Fig.1b: 350kHz 10-16V to 5V/3A Step-Down Converter (Front Page Efficiency w/12Vin) Efficiency 40 45 50 55 60 65 70 75 80 85 90 0 0.5 1 1.5 2 2.5 3 Load Current (A) SC4525A VIN =12V 12 12 SC4525D GND IN SW BST L1 10mH C1 0.33 mF SS/EN COMP FB D2 20BQ030 8.25k R6 33.2k 22 nF C8 47pF C5 2.2nF L1 : Coiltronics CD1-100 OUT 5V/3A D1 1N 4148 10 V–16V RSET C2 : Murata GRM31CR60J 476M C4 10mF C4 : Murata GRM31CR61E 106K VIN C2 47mF C7 R4 60.4k R5 11.5k R7 Fig.1a : 350 kHz10V - 16 V to5V/3 A Step - Down Converter ( Front Page Schematic ) |
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