DESCRIPTION

The NB650/NB650H is fully-integrated, highfrequency,

synchronous, rectified, step-down,

switch-mode converters with dynamic-output–

voltage control. It offers a very compact solution

to achieve 6A of continuous output current over

a wide input supply range, and has excellent

load and line regulation. The NB650/NB650H

operates at high efficiency over a wide outputcurrent–

load range.

Constant-On-Time control mode provides fast

transient response and eases loop stabilization.

2-bit VID inputs support changing the output

voltage on-the-fly.

Full protection features include short-circuit

protection, over-current protection, over-voltage

protection, under-voltage protection, and

thermal shut down.

The NB650/NB650H requires a minimal number

of readily-available standard external

components, and is available in a space-saving

3mm×4mm QFN17 package.

FEATURES

? Wide 4.5V-to-28V Operating Input Range

? 6A Output Current

? Internal 50mΩ High-Side, 18mΩ Low-Side

Power MOSFETs

? Proprietary Switching Loss Reduction

Technique

? 1 Reference Voltage

? Programmable Soft-Start Time

? 2-bit VID Input

? Soft Shutdown

? Frequency Programmable from 150kHz to

1MHz

? SCP, OCP, OVP, UVP, and Thermal

Shutdown

? Optional OCP Protection: Latch-Off Mode

(NB650) and Hiccup Mode (NB650H)

? Output Adjustable from 0.6V to 13V

? Available in QFN17 (3mm×4mm) Package

APPLICATIONS

? Notebook Systems and I/O Power

? Networking Systems

? Digital Set Top Boxes

? Flat-Panel Televisions and Monitors

? Distributed Power Systems