Wide Vin 5.5-26V, Low Iq, High Current, Fixed 5.1V-8A Synchronous Buck Converter with 100mA LDO and LP# Vout Scaling



The NB679A is a fully integrated, high- frequency, synchronous, rectified, step-down, switch- mode converter with a fixed 5.1V output andwith 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 lLow Ron pPower MOSFETs. 
Adaptive cConstant-On-Time (COT) control mode provides fast transient response and eases loop stabilization. The DC auto- tune loop provides good load and line regulation.
NB679A also provides a fixed 5V LDO, which can be used to power the external peripheries. 
Full protection features include OC lLimit, OVP, UVP, and thermal shut down. 
The converter requires a minimum number of external components and is available in a QFN-12 2mm x 3mm packages.



  • Wide 5.5V to 26V 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


  • fsw (max) (kHz)700
  • 最小输入电压5.5
  • Vin (max) (V)26
  • Iout (max) (A)8
  • Isw Limit (typ) (A)11
  • Vfb (typ) (V)5.1
  • Iq (typ) (mA)0.11
  • 额定输出1
  • Vout (max) (V)5.1
  • Vout (min) (V)5.1
  • GradeCatalog
  • PackageQFN-12 (2x3)
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special FeaturesLP# Output Voltage Scaling, Output Discharge, Ultrasonic Mode