G5656 Global Mixed-mode Technology Inc. 3A Step-down DC/DC Features General Description The G5656 is a monolithic step-down switch mode regulator with a built in internal power MOSFET. It achieves 3A continuous output current over a wide input supply range with excellent load and line regulation. 3A Output Current 0.15Ω 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 (FD) 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 G5656 requires a minimum number of readily available standard external components. It is available in a SOP-8 (FD) package. Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5656F11U G5656 -40°C to +85°C SOP-8 (FD) G5656F12U G5656A -40°C to +85°C SOP-8 (FD) Note: F1: SOP-8 (FD) 1 & 2: Bonding Code U : Tape & Reel Pin Configuration Typical Application Circuit G5656F11U NC 1 IN 2 LX 3 GND 4 G5656 8 Thermal Pad 7 SS VIN 4.75V~20V EN 6 COMP 5 FB 8 EN CC2 optional 10µH LX IN 10µF OFF ON EN COMP CC GND D1 SS34 R1/28kΩ FB SS 0.1µF RC VOUT 3.3V/3A 22µF MLCC R2/16kΩ SOP-8 (FD) G5656F12U SS 1 NC 2 IN 3 Thermal Pad 7 COMP 6 FB CC2 LX 4 5 G5656 VIN 4.75V~20V IN 10µF OFF ON EN COMP CC GND D1 SS34 R1/28kΩ FB SS R2/16kΩ VOUT 3.3V/3A 0.1µF 100µF/220µF Electrolytic 0.1µF RC GND 10µH LX SOP-8 (FD) VOUT = 1.22V x ( 1 + Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. R1 R2 ) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.5 Aug 03, 2009 1 G5657 Global Mixed-mode Technology Inc. 3A Step-down DC/DC Features General Description The G5657 is a monolithic step-down switch mode regulator with a built in internal power MOSFET. It achieves 3A continuous output current over a wide input supply range with excellent load and line regulation. 3A Output Current 0.15Ω 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 0.92V to 12V Available in SOP-8(FD) Package Current mode operation provides fast transient response ans 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 The G5657 requires a minimum number of readily available standard external components. It is available in a SOP-8 (FD) package. PC Monitors DSL Modems Distributed Power Systems Pre-Regulator for Linear Regulators Ordering Information ORDER NUMBER MARKING TEMP. RANGE PACKAGE (Green) G5657F11U G5657 -40°C to +85°C SOP-8 (FD) G5657F12U G5657A -40°C to +85°C SOP-8 (FD) Note: F1: SOP-8 (FD) 1 & 2: Bonding Code U : Tape & Reel Pin Configuration Typical Application Circuit G5657 VIN 4.75V~20V G5657F12U G5657F11U SS 1 NC 2 IN 3 LX 4 Thermal Pad SOP-8 (FD) CC2 optional 8 EN NC 1 7 COMP IN 2 6 FB LX 3 5 GND GND 4 8 Thermal Pad SS 7 EN 6 COMP 5 FB 10µF OFF ON EN COMP CC GND Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. CC2 D1 SS34 R1/62kΩ FB SS 0.1µF RC G5657 VIN 4.75V~20V SOP-8 (FD) 10µH LX IN IN 10µF OFF ON EN COMP CC GND D1 SS34 R1/62kΩ FB SS R2/24kΩ VOUT 3.3V/3A 0.1µF 100µF/220µF Electrolytic 0.1µF RC VOUT = 0.92V x (1+ R2/24kΩ 10µH LX VOUT 3.3V/3A 22µF MLCC R1 R2 ) TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.4 Aug 03, 2009 1