SC4524DSETRT Semtech

SC4524D 18V 2A Step-Down Switching Regulator POWER MANAGEMENT Features Description Wide input range: 3V to 18V The SC4524D is a constant frequency peak current-mode 2A Output Current step-down switching regulator capable of producing 2A 200kHz to 2MHz Programmable Frequency output current from an input ranging from 3V to 18V. The Precision 1V Feedback Voltage switching frequency of the SC4524D is programmable Peak Current-Mode Control up to 2MHz, allowing the use of small inductors and Cycle-by-Cycle Current Limiting ceramic capacitors for miniaturization, and high input/ Hiccup Overload Protection with Frequency Foldback output conversion ratio. The SC4524D is suitable for Soft-Start and Enable next generation XDSL modems, high-definition TVs and Thermal Shutdown various point of load applications. Thermally Enhanced 8-pin SOIC Package Fully RoHS and WEEE compliant Peak current-mode PWM control employed in the SC4524D achieves fast transient response with simple loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduces power dissipation during Applications output overload. Soft-start function reduces input start- up current and prevents the output from overshooting XDSL and Cable Modems during power-up. Set Top Boxes Point of Load Applications The SC4524D is available in SOIC-8 EDP package. CPE Equipment DSP Power Supplies LCD and Plasma TVs S S 270 RE V 4 Typical Application Circuit Efficiency D1 90 10V 16V V IN 1N4148 85 C4 C1 2.2 P F 0.33 P F BST 80 IN L1 OUT V IN = 12V SW 75 6.8 P H 5V/2A R4 SC4524D SS/EN 70 102k FB 65 COMP ROSC GND 60 D2 55 R6 C2 C7 R7 R5 20BQ030 25.5k 22 P F 10nF C8 30.1k 15.8k 50 10pF C5 1nF 45 40 L1: Wurth 744 778 9006 C2: Murata GRM31CR60J226K 0 0.5 1 1.5 2 C4: Murata GRM31CR61E225K Load Current (A) Figure 1 1MHz 10V-16V to 5V/2A Step-down Converter Rev. 2.1 2013 Semtech Corporation Efficiency (%)SC4524D Pin Configuration Ordering Information Device Package (1)(2) SC4524DSETRT SOIC-8 EDP SW 1 8 B S T SC4524DEVB Evaluation Board IN 2 7 FB Notes: 9 R O S C 3 6 C O M P (1) 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 G N D 4 5 S S /E N compliant and halogen-free. (8 - Pin SOIC - EDP) Marking Information yyww=Date code (Example: 0752) xxxxx=Semtech Lot No. (Example: E9010) 2