SC4525FSETRT Semtech

SC4525F 18V, 3A, 350kHz Step-Down Switching Regulator POWER MANAGEMENT Features Description Input Voltage Range: 3V to 8V The SC4525F is a 350kHz constant frequency peak 3A Output Current current-mode step-down switching regulator capable of 350kHz Fixed Switching Frequency producing 3A output current from an input ranging from Precision V F eedback Voltage 3V to 8V. The SC4525F is suitable for next generation Peak Current-Mode Control XDSL modems, high-definition TVs and various point of Cycle-by-Cycle Current Limiting load applications. Hiccup Overload Protection with Frequency Foldback Soft-Start and Enable Peak current-mode PWM control employed in the Thermal Shutdown SC4525F achieves fast transient response with simple loop Thermally Enhanced 8-pin SOIC Package compensation. Cycle-by-cycle current limiting and hiccup Fully RoHS and WEEE Compliant overload protection reduces power dissipation during output overload. Soft-start function reduces input start- up current and prevents the output from overshooting during power-up. Applications The SC4525F is available in SOIC-8 EDP package. XDSL and Cable Modems Set Top Boxes Point of Load Applications CPE Equipment DSP Power Supplies Fig.1b: 350kH z 10-16V to 5V /3A Step-D ow n C onverter (Front Page Efficiency w /12V in) LCD and Plasma TVs S C4525A Typical Application Circuit Efficiency D 1 90 10V 16V V IN 85 1N 4148 C 4 C 1 V =1 2 V 80 IN 10 mF 0.33mF B S T IN L1 O U T 75 S W 10 mH 5V /3A 70 R 4 S S /E N S C 4525F 33.2k 65 F B 60 C O M P R S E T G N D 55 D 2 R 6 C 2 C 7 R 7 R 5 50 47 mF 20B Q 030 8.25k 22nF C 8 11.5k 60.4k 47pF 45 C 5 2.2nF 40 0 0.5 1 1.5 2 2.5 3 L1: C oiltronics C D 1- 100 C 2: M urata G R M 31C R 60J476M Load Current (A) C 4: M urata G R M 31C R 61E 106K Figure 1 350kHz 10V - 16V to 5V/3A Step-down Converter E fficiency of the 1M H z 10V -28V to 5V /3A Step-D ow n C onverter (Front P age) Revision 2. 203 S emtech Corporation Efficiency (%)SC4525F Pin Configuration Ordering Information Device Package ( )(2) SC4525FSETRT SOIC-8 EDP SW 1 8 B S T SC4525FEVB Evaluation Board IN 2 7 FB Notes: 9 R S E T 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