EVNB679
26V, Low Iq, High Current, Fixed 5.5V-8A
Synchronous Buck Converter
with 100mA LDO
PRELIMINARY SPECIFICATIONS SUBJECT TO CHANGE
EVNB679 Rev. 1.0 www.MonolithicPower.com 1
11/14/2014 MPS Proprietary Information. Patent Protected. Unauthorized Photocopy and Duplication Prohibited.
Preliminary Specifications Subject to Change © 2014 MPS. All Rights Reserved.
The Future of Analog IC Technology
DESCRIPTION
The NB679 is a fully integrated high frequency
synchronous rectified step-down switch mode
converter with fixed 5V Vout. It offers very
compact solution to achieve 8A continuous
output current and 10A peak output current over
a wide input supply range with excellent load
and line regulation.
The NB679 operates at high efficiency over a
wide output current load rang based on MPS
proprietary switching loss reduction tech and
internal Low Ron Power MOSFETs
Adaptive Constant-On-Time (COT) control
mode provides fast transient response and
eases loop stabilization. The DC auto tune loop
provides good load and line regulation.
NB679 also provide fixed 5V LDO which can be
used to power the external peripheries.
Full protection features include OC Limit, OVP,
UVP and thermal shut down. The converter
requires minimum number of external
components and is available in QFN 2x3
packages.
FEATURES
• Wide 5.5V to 26V Operating Input Range
• Fixed 5V Vout, Support 5.5V-5V
• Ultrasonic Mode
• 100μA low quiescent Current
• 8A Continous Output Current
• 10A Peak Output Current
• Adaptive COT for Fast transient
• DC Auto Tune Loop
• Stable with POSCAP and Ceramic Output
• Built-in 5V, 100mA LDO with Switch Over
• 1% Reference Voltage
• Internal Soft Start
• Output Discharge
• 700kHZ Switching Frequency
• OCP, OVP, UVP(metal Hiccup) Protection
and Thermal Shutdown.
• Latch off reset via EN or Power cycle.
APPLICATIONS
• Notebook Systems and Tablet PC
• Networking Systems and Server
• Personal Video Recorders
• Distributed Power Systems
EVNB679-D-00A EVALUATION BOARD
(L x W ) 635mm x 635mm
Board Number MPS IC Number
EVNB679-D-00A NB679
OUTPUT CURRENT(A)
60
70
80
90
100
0.001 0.01 0.1 1 10
V
IN
=19V
V
IN
=12V
V
IN
=8.4V
V
IN
=5.5V
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 o
Monolithic Power Systems, Inc.
