SC4525CSETRT Semtech

SC4525C 28V 3A Step-Down Switching Regulator POWER MANAGEMENT Features Description Wide input range: 3V to 28V The SC4525C is a constant frequency peak current-mode 3A Output Current step-down switching regulator capable of producing 3A 200kHz to 2MHz Programmable Frequency output current from an input ranging from 3V to 28V. The Precision V Feedback Voltage switching frequency of the SC4525C can be programmed Peak Current-Mode Control up to 2MHz for component miniaturization or it can be Cycle-by-Cycle Current Limiting set at lower frequencies to accommodate high step-down Hiccup Overload Protection with Frequency Foldback ratios. The SC4525C is suitable for next generation XDSL Soft-Start and Enable modems, high-definition TVs and various point of load Thermal Shutdown applications. Thermally Enhanced 8-pin SOIC Package Fully RoHS and WEEE compliant Peak current-mode PWM control employed in the SC4525C achieves fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup Applications overload protection reduces power dissipation during output overload. Soft-start function reduces input start- XDSL and Cable Modems up current and prevents the output from overshooting Set Top Boxes during power-up. Point of Load Applications CPE Equipment The SC4525C is available in SOIC-8 EDP package. DSP Power Supplies LCD and Plasma TVs Automotive Car Audio SC4525A Typical Application Circuit Efficiency 90 D1 10V 28V V IN 1N4148 C4 80 C1 V = 24V 4.7mF IN 0.33 mF IN BST VIN = 12V L1 OUT SW 5.2mH 70 5V/3A R4 SC4525C SS/EN 33.2k FB 60 COMP ROSC GND C7 D2 R6 C2 50 R5 R7 C8 20BQ030 8.25k 10 mFX3 15.8k 22nF 12.7k 22pF C5 2.2nF 40 0.0 0.5 1.0 1.5 2.0 2.5 3.0 L1: CoiltronicsCD1-5R2 C2: Murata GRM31CR60J106K Load Current (A) C4: Murata GRM32ER71H475K Figure 1. 1MHz 10V -28V to 5V/3A Step-down Converter Revision 5. 20 S emtech Corporation Efficiency of the 1MHz 10V-28V to 5V/3A Step-Down Converter (Front Page) Efficiency (%)SC4525C Pin Configuration Ordering Information Device Package ( )(2) SC4525CSETRT SOIC-8 EDP SW 1 8 BST SC4525CEVB Evaluation Board IN 2 7 FB Notes: 9 ROSC 3 6 COMP ( ) Available in tape and reel only. A reel contains 2,500 devices. (2) Available in lead-free package only. Device is fully WEEE and RoHS GND 4 5 SS/EN compliant and halogen-free. (8 - Pin SOIC - EDP) Marking Information yyww=Date code (Example: 0752) xxxxx=Semtech Lot No. (Example: E900) 2