G5798/G5798A G5799/G5799A Global Mixed-mode Technology 500kHz 2A/3A Synchronous Step-down DC/DC Features General Description The G5798/G5799 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 Internal 100mΩ RDS-ON High-Side and 100mΩ RDS-ON Low-Side Power Switches Available two kinds of delay in PG PG pin is detect FB until threshold then immediately react in G579X PG pin is detect FB until threshold then delay 220mS react in G579XA Stable with Low ESR Output Ceramic Capacitors 32µA Shutdown Mode Fixed 500kHz Frequency Thermal Shutdown Cycle-by-Cycle Over Current Protection Wide 4.5V to 24V Operating Input Range Vref =0.8V +-2% Internal soft start Available in SOP-8/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 32µA of supply current. Internal soft-start for output power up ramp and minimizes the inrush supply current at initial startup. PG in G579X is open-drain pin detect from FB. When FB>0.92XVref, PG is high impedance and FB<0.85XVref, PG is low impedance. G579XA add typical 220mS deglitch timeout period when FB>0.92XVref to make sure PG signal. Applications The G5798/G5799 requires a minimum number of readily available standard external components. It is available in a SOP-8 (FD) package. DSL Modems Distributed Power Systems Pre-Regulator for Linear Regulators Ordering Information ORDER NUMBER MARKING G5798P11U G5798 G5798AP11U G5798A G5799F11U G5799 G5799AF11U G5799A Note: P1: SOP-8 F1: SOP-8 (FD) 1: Bonding Code U : Tape & Reel PG DELAY TIME TEMP. RANGE PACKAGE (Green) No delay delay 220mS No delay delay 220mS -40°C to +85°C -40°C to +85°C -40°C to +85°C -40°C to +85°C SOP-8 SOP-8 SOP-8 (FD) SOP-8 (FD) Pin Configuration G5799/G5799A G5798/G5798A BST 1 8 VCC IN 2 7 PG SW 3 6 EN GND 4 5 FB 8 VCC 7 PG 3 6 EN 4 5 FB BST 1 IN 2 SW GND Thermal Pad SOP-8 (FD) SOP-8 Note: Recommend connecting the Thermal Pad to the Ground for excellent power dissipation. TEL: 886-3-5788833 http://www.gmt.com.tw Ver:0.92 Aug 05, 2013 1