SC4525EMSETRT Semtech

SC4525EM 28V 3A Step-Down Switching Regulator HIGH-RELIABILITY PRODUCTS Features Description Wide Input Voltage Range: 3V to 28V The SC4525EM is a constant frequency peak current-mode 3A Output Current step-down switching regulator capable of producing 3A 200kHz to 2MHz Programmable Frequency output current from an input ranging from 3V to 28V. The Precision V F eedback Voltage switching frequency of the SC4525EM 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 SC4525EM is suitable for various point of load Soft-Start and Enable applications. Thermal Shutdown Thermally Enhanced 8-pin SOIC Package Peak current-mode PWM control employed in the Fully RoHS and WEEE Compliant SC4525EM achieves fast transient response with simple Military Temperature Range: -55C to + 25C loop compensation. Cycle-by-cycle current limiting and hiccup overload protection reduces power dissipation during output overload. Soft-start function reduces Applications input start-up current and prevents the output from overshooting during power-up. Point of Load Applications The SC4525EM is available in SOIC-8 EDP package. S C 4525A Typical Application Circuit E fficie ncy 90 D 1 10V 28V V IN 1N 4148 C 4 C 1 80 4.7 mF 0.33 mF B S T V IN = 24V IN L1 O U T V IN = 12V S W 5.2 mH 5V /3A 70 R 4 R 8 S C 4525E M S S /E N 33.2k 10 F B 60 C O M P R O S C G N D C 9 C 7 D 2 R 6 C 2 470pF R 5 R 7 C 8 10 mF X 3 50 20B Q 030 8.25k 15.8k 12.7k 22nF 22pF C 5 2.2nF 40 0.0 0.5 1.0 1.5 2.0 2.5 3.0 L1: C oiltronics C D 1- 5R 2 C 2: M urata G R M 31C R 60J106K C 4: M urata G R M 32E R 71H 475 K Load C urrent (A) Figure 1. 1MHz 10V - 28V to 5V/3A Step-down Converter Rev. 2.0 20 7 Se mtech Corporation E fficiency of the 1M H z 10V -28V to 5V /3A S tep-D ow n C onverter (Front P age) Efficiency (%)SC4525EM Pin Configuration Ordering Information Device Package ()(2 ) SC4525EMSETRT SOIC-8 EDP SW 1 8 B S T (3) SC4525EEVB Evaluation Board IN 2 7 FB Notes: 9 R O S C 3 6 C O M P () A vailable 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. (3) This EVB comes populated with the industrial temperature grade device. (8 - Pin SOIC - EDP) Marking Information yyww=Date code (Example: 0752) xxxxx=Semtech Lot No. (Example: E900) 2