DESCRIPTION
The NB679A is a fully integrated, highfrequency, synchronous, rectified, step-down,
switch-mode converter with a fixed 5.1V output
and low-power mode voltage scaling. It offers a
very compact solution to achieve an 8A
continuous output current and a 10A peak
output current over a wide input supply range
with excellent load and line regulation.
The NB679A operates at high efficiency over a
wide output current load range based on MPS
proprietary switching loss reduction technology
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.
The NB679A provides a fixed 5V LDO, which
can be used to power the external peripheries.
Full protection features include OC limit, OVP,
UVP, and thermal shutdown.
The converter requires a minimum number of
external components and is available in a
QFN-12 2mm x 3mm package.

FEATURES
 Wide 5.5V to 28V Operating Input Range
 Fixed 5.1V Vout (+2% of 5V Vout)
 LP# Output Voltage Scaling (-3% of 5V Vout)
 Supports Large Duty Operation
 Ultrasonic Mode
 100μA Low Quiescent Current
 8A Continuous Output Current and 10A
Peak Output Current
 Adaptive COT for Fast Transient
 DC Auto-Tune Loop
 Stable with POSCAP and Ceramic Output
Capacitors
 Built-In 5V, 100mA LDO with Switch Over
 1% Reference Voltage
 Internal Soft Start
 Output Discharge
 700kHZ Switching Frequency
 OCP, OVP, UVP, and Thermal Shutdown
 Latch-Off Reset via EN or Power Cycle
 QFN-12 2mm x 3mm Package

APPLICATIONS
 Laptop Computers
 Tablet PCs
 Networking Systems
 Flat Panel Televisions and Monitors
 Distributed Power Systems