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