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