DESCRIPTION

The NB679 is a fully integrated, high-frequency, synchronous, rectified, step-down switch-mode converter with a fixed 5 V output. It offers a very compact solution to achieve 8 A continuous output current and 10 A 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 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.

NB679 provides a fixed 5 V 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 QFN 2mm x 3mm package.

FEATURES

 Wide 5.5 V to 28 V Operating Input Range

 Fixed 5 V Vout

 Supports 5.5 V-5 V

 Ultrasonic Mode with Fs over 25 kHz

 100 μA Low Quiescent Current

 8 A Continous Output Current

 10 A Peak Output Current

 Adaptive COT for Fast Transient

 DC Auto-Tune Loop for Load Regulation

 Stable with POSCAP and Ceramic Output Capacitors

 Built-In 5 V, 100 mA LDO with Switch Over

 1% Reference Voltage

 Internal Soft Start

 Output Discharge

 700 kHZ 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

 Personal Video Recorders

 Flat Panel Television and Monitors

 Distributed Power Systems