NB650/NB650H
High-Effeciency, Fast-Transient, 6A, 28V
Synchronous Step-Down Converters with 2-Bit VID
The Future of Analog IC Technology
DESCRIPTION
The NB650/NB650H is fully-integrated, high-
frequency, 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 output-
current–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
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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
Notebook Systems and I/O Power
Networking Systems
Digital Set Top Boxes
Flat-Panel Televisions and Monitors
Distributed Power Systems
APPLICATIONS
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance. “MPS” and “The
Future of Analog IC Technology” are Registered Trademarks of Monolithic
Power Systems, Inc.
TYPICAL APPLICATION
（FOR
NOTEBOOK）
V
IN
11
C1
ON/OFF
R6
R7
IN
BST
3
C3
R4
L1
C4
R1
C2
V
OUT
17
5
8
C5
ON/OFF
ON/OFF
R5
4
6
7
PG
VID1
VID2
PGND
9,10
GND
12
RFB2
14
FREQ
EN
VCC
SW
1,2
NB650
NB650H
FB
13
R2C
R2B
R2A
RFB1 15
SS
16
C6
NB650/NB650H Rev. 1.12
www.MonolithicPower.com
10/11/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
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