SC4524 Datasheet | SEMTECH

Description The SC4524 is an adjustable frequency peak currentmode step-down switching regulator with an integrated 2.3A, 30V switch. The SC4524 can be programmed up to 1.5MHz. This allows the use of small inductor and ceramic capacitors, resulting in very pact power supplies. The SC4524 is suitable for next generation XDSL modems, set-top boxes and point of load applications. Features u u u u Up to 1.5 MHz Programmable Switching Frequency 2.3A Integrated Switch Wide Input Voltage Range 2.8V to 30V Peak Current-Mode Control with Cycle-by-Cycle Current Limiting Hiccup Overload Protection Soft-Start and Enable Thermal Shutdown Thermally Enhanced 8-Pin SOIC Package Fully WEEE and Ro HS pliant u u u The SC4524 uses peak current-mode PWM control for .. ease of pensation. Cycle-by-cycle current limit and u hiccup overload protection reduce power dissipation u during overload. bined soft start and enable pin not only eliminates output start up overshoot but also allows power sequencing. The SC4524 is available in SOIC-8 EDP package. Applications u u u u u u XDSL and Cable Modems Set-top Boxes Point of Load Applications CPE Equipment DSP Power Supplies Disk Drives Typical Application Circuit Efficiency V IN 24V D1 C7 22n F Efficiency (%) C2 1N4148 0.1 m F L1 OUT 5V/2A R1 22.1k 75 70 65 60 55 4.7 m H C6 22p F R5 15.4k C5 470p F ROSC R3 17.4k C3 10 m F D2 20BQ030 C1 22 m F R2 5.49k L1: Coiltronics FP3-4R7 C1: Murata GRM21BR60J226M C3: Murata GRM32ER71H106K 50 0.0 0.5 1.0 1.5 2.0 Load Current...