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| NB638 Datasheet, PDF (1/19 Pages) Monolithic Power Systems – High Efficiency, Fast Transient, 7A, 28V Synchronous Step-down Converter in a Tiny 3x4mm QFN Package | |||
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The Future of Analog IC Technology
NB638
High Efficiency, Fast Transient, 7A, 28V
Synchronous Step-down Converter
in a Tiny 3x4mm QFN Package
DESCRIPTION
The NB638 is a fully integrated, high frequency
synchronous rectified step-down switch mode
converter. It offers a very compact solution to
achieve 7A continuous output current over a
wide input supply range with excellent load and
line regulation. The NB638 operates at high
efficiency over a wide output current load range.
Constant-On-Time (COT) control mode
provides fast transient response and eases loop
stabilization.
Full protection features include SCP, OCP, OVP,
UVP and thermal shutdown.
The NB638 requires a minimum number of
readily available standard external components
and is available in a space-saving QFN20
(3x4mm) package.
FEATURES
⢠Wide 4.5V to 28V Operating Input Range
⢠7A Output Current
⢠Internal 30m⦠High-Side, 12m⦠Low-Side
Power MOSFETs
⢠Proprietary Switching Loss Reduction
Technique
⢠1% Reference Voltage
⢠Programmable Soft Start Time
⢠Soft Shutdown
⢠200kHz to 1MHz Switching Frequency
⢠SCP, OCP, OVP, UVP Protection and
Thermal Shutdown
⢠Output Adjustable from 0.8V to 13V
⢠Available in a QFN20 (3x4mm) Package
APPLICATIONS
⢠Notebook Systems and I/O Power
⢠Networking Systems
⢠Optical Communication Systems
⢠Distributed Power and POL Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Products, Quality Assurance page.
âMPSâ and âThe Future of Analog IC Technologyâ are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
VIN
R7
8,19 IN
CIN
BST 7
C3
NB638 SW
2 FREQ
9,10,17,18
20 VCC
R4
C4
6 PGOOD
EN
5 EN
FB 3
SS AGND PGND
4
1
CSS
33nF
11-16
VOUT 1.05V
R1
C2
R2
NB638 Rev.1.16
www.MonolithicPower.com
1
4/18/2012
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2012 MPS. All Rights Reserved.
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