SC4524CSETRT Semtech

SC4524C 28V 2A Step-Down Switching Regulator POWER MANAGEMENT Features Description Wide input range: 3V to 28V The SC4524C 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 28V. The Precision V Feedback Voltage switching frequency of the SC4524C 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 SC4524C 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 SC4524C 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 SC4524C is available in SOIC-8 EDP package. DSP Power Supplies LCD and Plasma TVs Automotive Car Audio S S 270 RE V 4 Typical Application Circuit Efficiency D1 90 10V 28V V IN 85 1N4148 C4 C1 2.2 P F 80 0.33 P F BST IN L1 OUT 75 V = 12V V = 24V SW IN IN 8.2 P H 5V/2A R4 70 SC4524C SS/EN 42.2k 65 FB 60 COMP ROSC GND 55 D2 R6 C2 C7 R7 R5 20BQ030 10.5k 22 P F 50 10nF C8 28.0k 15.8k 22pF C5 45 2.2nF 40 0 0.5 1 1.5 2 L1: Coiltronics DR73-8R2 C2: Murata GRM31CR60J226K C4: Murata GRM31CR71H225K Load Current (A) Figure 1. 1MHz 10V-28V to 5V/2A Step-down Converter Rev. 2. 20 3 Semtech Corporation Fig.1 Efficiency of the 1M H z 10V -28V to 5V /2A Step-D ow n C onverter (Front Page) Efficiency (%)SC4524C Pin Configuration Ordering Information Device Package ( )(2) SC4524CSETRT SOIC-8 EDP SW 1 8 B S T SC4524CEVB Evaluation Board IN 2 7 FB Notes: 9 R O S C 3 6 C O M P ( ) 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: E900) 2