Monolithic Power Systems EVNB679

Description

The NB679 is a fully integrated high frequency synchronous rectified step-down switch mode converter with fixed 5V Vout. It offers verycompact solution to achieve 8A continuous output current and 10A peak output current over a wide input supply range with excellent loadand line regulation. The NB679 operates at high efficiency over awide 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) Protectionand Thermal Shutdown.
• Latch off reset via EN or Power cycle.

Typical applications

• Distributed Power Systems
• Notebook Systems and Tablet PC
• Personal Video Recorders
• Networking Systems and Server