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| NB639 Datasheet, PDF (1/19 Pages) Monolithic Power Systems – High Efficiency, Fast Transient, 8A, 28V Synchronous Step-down Converter In a Tiny QFN20 (3x4mm) Package | |||
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The Future of Analog IC Technology
NB639
High Efficiency, Fast Transient, 8A, 28V
Synchronous Step-down Converter
In a Tiny QFN20 (3x4mm) Package
DESCRIPTION
The NB639 is a fully integrated, high frequency
synchronous rectified step-down switch mode
converter. It offers a very compact solution to
achieve 8A continuous output current over a wide
input supply range with excellent load and line
regulation. The NB639 operates at high efficiency
over a wide output current load range.
To further optimize efficiency at light load, this
deviceâs VCC supply is designed to be biased
externally.
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 NB639 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
⢠8A 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
⢠Programmable 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 POL Systems
All MPS parts are lead-free and adhere to the RoHS directive. For MPS green
status, please visit MPS website under Quality Assurance.
âMPSâ and âThe Future of Analog IC Technologyâ are Registered Trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
NB639 Rev.1.13
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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