NB670
24V, High Current
Synchronous Buck Converter With LDO
The Future of Analog IC Technology
DESCRIPTION
FEATURES
The NB670 is a fully integrated high frequency
synchronous rectified step-down switch mode
converter with 3.3V 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 NB670
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.
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Wide 5V to 24V Operating Input Range
3.3V Fixed Output Voltage
Built-in 3.3V, 100mA LDO with Switches
6A Continuous Output Current
9A Peak Output Current
300kHZ CLK for External Charge Pump
Low RDS(ON) Internal Power MOSFETs
Proprietary Switching Loss Reduction
Technique
Internal Soft Start
Output Discharge
500kHZ Switching Frequency
OCP, OVP, UVP Protection and Thermal
Shutdown
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Under voltage lockout is internally set as 4.65 V.
An open drain power good signal indicates the
output is within its nominal voltage range.
NB670 also provides a 3.3V 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.
APPLICATIONS
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Laptop Computer
Tablet PC
Networking Systems
Personal Video Recorders
Flat Panel Television and Monitors
Distributed Power Systems
Full protection features include OCP, OVP,
UVP and thermal shut down.
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.
The converter requires minimum number of
external components and is available in QFN16
(3mmx3mm) package.
TYPICAL APPLICATION
100
95
90
V
=6V
IN
85
80
75
70
65
60
55
50
V
=8.4V
IN
V
=12.6V
IN
V
=19V
IN
1
10
100
1000 10000
OUTPUT CURRENT (A)
NB670 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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