G5654 Global Mixed-mode Technology Inc. 2A Step-down DC/DC Features General Description The G5654 is a monolithic step-down switch mode regulator with a built in internal power MOSFET. It achieves 2A continuous output current over a wide input supply range with excellent load and line regulation. 2A Output Current 0.18Ω Internal Power MOSFET Switch Stable with Low ESR Output Ceramic Capacitors Up to 95% Efficiency 25µA Shutdown Mode Fixed 380kHz Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Wide 4.75V to 20V Operating Input Range Output Adjustable from 1.22V to 12V Available in SOP-8 Package Current mode operation provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limiting, output short circuit protection and thermal shutdown. In shutdown mode the regulator draws 25µA of supply current. Programmable soft-start overwrites the internal soft-start for various requirement of output power up ramp and minimizes the inrush supply current at initial startup. Applications PC Monitors DSL Modems Distributed Power Systems Pre-Regulator for Linear Regulators The G5654 requires a minimum number of readily available standard external components. It is available in a SOP-8 package. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5654P11U G5654P12U G5654 G5654A -40°C to +85°C -40°C to +85°C SOP-8 SOP-8 Note: P1: SOP-8 1: Bonding Code U : Tape & Reel Pin Configuration Typical Application Circuit G5654P11U G5654 NC 1 8 SS IN 2 7 EN LX 3 6 COMP GND 4 5 VIN 4.75V~20V CC2 optional 10µH LX IN 10µF OFF ON EN COMP CC GND D1 SS34 R1/28kΩ FB SS 0.1µF RC VOUT 3.3V/2A 22µF MLCC R2/16kΩ FB SOP-8 G5654 VIN 4.75V~20V G5654P12U SS 1 8 EN NC 2 7 COMP IN 3 6 FB LX 4 5 GND CC2 IN 10µF OFF ON EN COMP CC GND VOUT = 1.22V x ( 1 + D1 SS34 R1/28kΩ FB SS R2/16kΩ VOUT 3.3V/2A 0.1µF 100µF/220µF Electrolytic 0.1µF RC SOP-8 10µH LX R1 R2 ) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.5 Aug 03, 2009 1