SC4524ESETRT Semtech

SC4524E 28V 2A Step-Down Switching Regulator POWER MANAGEMENT Features Description Wide Input Voltage Range: 3V to 28V The SC4524E 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 SC4524E 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 SC4524E 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 SC4524E 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 SC4524E 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 D 1 90 10V 28V V IN 85 1N 4148 C 4 C 1 2.2 mF 0.33mF 80 IN B S T L1 O U T 75 V = 12V V = 24V S W IN IN 8.2 mH 5V /2A R 4 70 S C 4524E S S /E N 42.2k 65 F B 60 C O M P R O S C G N D 55 D 2 R 6 C 2 C 7 R 7 R 5 20B Q 030 10.5k 22 mF 50 10nF C 8 28.0k 15.8k 22pF C 5 45 2.2nF 40 0 0.5 1 1.5 2 L1: C oiltronics D R 73 - 8R 2 C 2: M urata G R M 31C R 60J226K Load Current (A) C 4: M urata G R M 31C R 71H 225K Figure 1. 1MHz 10V-28V to 5V/2A Step-down Converter Rev. 2.0 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 (%)SC4524E Pin Configuration Ordering Information Device Package ( )(2) SC4524ESETRT SOIC-8 EDP SW 1 8 B S T SC4524EEVB 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