G5796/G5796A G5797/G5797A Global Mixed-mode Technology 500kHz 2A/3A Synchronous Step-down DC/DC Features General Description The G5796/G5797 is a monolithic step-down switch mode regulator with a built in internal power MOSFET. It achieves 2A/3A continuous output current over a wide input supply range with excellent load and line regulation. 2A/3A Output Current 0.1Ω Internal Power MOSFET Switch Stable with Low ESR Output Ceramic Capacitors Up to 95% Efficiency 32µA Shutdown Mode Fixed 500kHz Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Wide 4.5V to 24V Operating Input Range Output Adjustable from 0.92V to 21.6V Available in SOP-8/SOP-8 (FD) Package Build in skip mode at light loading in G5796A/G5797A Current mode operation provides fast transient response and eases loop stabilization. Provide skip mode in G5796A/G5797A. When loading too light clock skip several cycle proportional to load. Fault condition protection includes cycle-by-cycle current limiting, output short circuit protection and thermal shutdown. In shutdown mode the regulator draws 32µA 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 DSL Modems Distributed Power Systems Pre-Regulator for Linear Regulators The G5796/G5797 requires a minimum number of readily available standard external components. It is available in a SOP-8/SOP-8 (FD) package. Ordering Information ORDER NUMBER MARKING LIGHT LOAD TEMP. RANGE PACKAGE (Green) G5796P11U G5796 PWM MODE -40°C to +85°C SOP-8 G5796AP11U G5797F11U G5796A G5797 SKIP MODE PWM MODE -40°C to +85°C -40°C to +85°C SOP-8 SOP-8 (FD) G5797AF11U G5797A SKIP MODE -40°C to +85°C SOP-8 (FD) Note: P1: SOP-8 F1: SOP-8 (FD) 1: Bonding Code U : Tape & Reel Pin Configuration Typical Application Circuit G5796/G5796A BS IN LX GND C1 10µF/35V 8 1 7 2 3 6 4 C5 0.1µF INPUT 4.5V to 24V 5 SS CERAMIC x2 EN R4 100kΩ 2 7 8 BS EN LX 3 G5796/G5796A SS FB 4 L1 4.7µH OUTPUT 3.3V/2A R1 26.1kΩ 1% 6 R2 10kΩ 1% C3 3.9nF R3 C6 OPEN FB 5 COMP GND C4 0.1µF COMP 1 IN C2 22µF/35V CERAMIC 6.8kΩ SOP-8 G5797/G5797A BS 8 1 C5 0.1µF INPUT 4.5V to 24V SS C1 10µF/35V CERAMIC IN LX GND 2 Thermal Pad 3 7 EN 7 8 6 4 x2 R4 100kΩ 2 5 COMP C4 0.1µF 1 IN BS LX EN G5797/G5797A SS FB 5 COMP GND 4 6 FB C6 OPEN SOP-8 (FD) 3 C3 3.9nF R3 L1 4.7µH R1 26.1kΩ OUTPUT 3.3V/3A 1% R2 10kΩ 1% C2 22µF/35V CERAMIC 6.8kΩ Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver: 0.6 Aug 05, 2013 1