DESCRIPTION

The NB633 is a high frequency synchronous

rectified step-down switch mode converter with

built in internal power MOSFETs. It offers a

very compact solution to achieve 3A continuous

output current over a wide input supply range

with excellent load and line regulation. The

NB633 operates at high efficiency over a wide

output current load range.

Current mode operation provides fast transient

response and eases loop stabilization.

Full protection features include OCP and thermal

shut down.

The NB633 requires a minimum number of

readily available standard external components

and is available in a space saving 3mm x 4mm

14-pin QFN package.

FEATURES

• Wide 4.5V to 24V Operating Input Range

• 3A Output Current

• Low RDS(ON) Internal Power MOSFETs

• Proprietary Switching Loss Reduction

Technique

• Fixed 500kHz Switching Frequency

• Sync from 300kHz to 2MHz External Clock

• Internal Compensation

• OCP Protection and Thermal Shutdown

• Output Adjustable from 0.8V

• Available in 14-pin QFN3x4 Package

APPLICATIONS

• Notebook Systems and I/O Power

• Networking Systems

• Digital Set Top Boxes

• Personal Video Recorders

• Flat Panel Television and Monitors

• Distributed Power Systems