APU3137

Technology Licensed from International Rectifier APU3137 8-PIN SYNCHRONOUS PWM CONTROLLER FEATURES 1A Peak Output Drive Capability 0.8V Reference Voltage Shuts off both drivers at shorted output and shutdown Operating with single 5V or 12V supply voltage Stable with ceramic capacitors Internal 200KHz Oscillator Soft-Start Function Protects the output when control FET is shorted Synchronous Controller in 8-Pin Package RoHS Complaint DESCRIPTION The APU3137 controller IC is designed to provide a low cost and high performance synchronous Buck regulator for on-board DC to DC converter applications. The output voltage can be set as low as 0.8V and higher voltage can be obtained with an external voltage divider. High peak current gate drivers provide fast switching transition for applications requiring high output current in the range of 15A to 20A. This device features an internal 200KHz oscillator, under-voltage lockout for both Vcc and Vc supplies, an external programmable soft-start function as well as output under-voltage detection that latches off the device when an output short is detected. APPLICATIONS DDR Memory Application Low voltage distributed DC-DC Graphic Cards Low cost on-board DC to DC such as 5V to 2.5V, 1.8V or 0.8V TYPICAL APPLICATION 12V C3 1uF C4 1uF C2 4x 150uF Optional L1 1uH 5V C1 47uF Vcc Vc HDrv D1 Q1 IRF7832 L2 2.2uH Q2 IRF7832 C8 0.1uF SS/SD U1 APU3137 LDrv 2.5V @ 15A C7 3x 330uF 40mΩ , Poscap Comp C9 3300pF Optional R4 30K R3 Fb Gnd R5 1...