DESCRIPTION

The APU3039 controller IC is designed to provide a synchronous Buck regulator and is targeted for applications where the cost and size is critical. The APU3039 operates with a single input supply up to 18V. The output voltage can be programmed as low as 0.8V for low voltage applications. Selectable current limit is provided to tailor to external MOSFET’s on-resistance for optimum cost and performance. The APU3039 features an uncommitted error amplifier for tracking output voltage and is capable of sourcing or sinking current for applications such as DDR bus termination.

FEATURES

■ Current Limit using Lower MOSFET Sensing

■ Using the 6V internal regulator for charge pump

circuit allows single supply operation up to 18V

■ Programmable Switching Frequency up to 400KHz

■ Soft-Start Function

■ 0.8V Precision Reference Voltage Available

■ Uncommitted Error Amplifier Available for DDR

Voltage Tracking Applications

■ Stable with Ceramic Capacitor

■ RoHS Compliant

APPLICATIONS

■ DDR Memory VDDQ/VTT Applications

■ Graphic Card

■ Hard Disk Drive

■ Netcom on-board DC to DC regulator application

■ Output voltage as low as 0.8V

■ Low Cost On-Board DC to DC