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