NB669
24V, High Current
Synchronous Buck Converter With LDO
The Future of Analog IC Technology
DESCRIPTION
The NB669 is a fully integrated high frequency
synchronous rectified step-down switch mode
converter with 5V fixed output voltage. It offers
very compact solution to achieve 6A continuous
output current and 9A peak output current over
a wide input supply range with excellent load
and line regulation. The NB669 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.
Under voltage lockout is internally set as 4.15 V.
An open drain power good signal indicates the
output is within its nominal voltage range.
NB669 also provides a 5V LDO, which can be
used to power the external peripheries, such as
the keyboard controller in the laptop computer.
A 300kHz CLK is also available; its output can
be used to drive an external charge pump,
generating gate drive voltage for the load
switches without reducing the main converter’s
efficiency.
Full protection features include OCP, OVP,
UVP and thermal shut down.
The converter requires minimum number of
external components and is available in QFN16
(3mmx3mm) package.
FEATURES
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Wide 6.5V to 24V Operating Input Range
5V Fixed Output Voltage
Built-in 5V, 100mA LDO with Switches
6A Continuous Output Current
9A Peak Output Current
300kHZ CLK for External Charge Pump
Low R
DS
(ON) Internal Power MOSFETs
Proprietary Switching Loss Reduction
Technique
Internal Soft Start
Output Discharge
500kHZ Switching Frequency
OCP, OVP, UVP Protection and Thermal
Shutdown
Laptop Computer
Tablet PC
Networking Systems
Personal Video Recorders
Flat Panel Television and Monitors
Distributed Power Systems
APPLICATIONS
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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.
“MPS” and “The Future of Analog IC Technology” are registered trademarks of
Monolithic Power Systems, Inc.
TYPICAL APPLICATION
NB669 Rev. 1.01
7/23/2013
www.MonolithicPower.com
MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
© 2013 MPS. All Rights Reserved.
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