Wide Vin 5-24V, 6A, COT Synchronous Step-down Converter

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The NB671 is a fully integrated high frequency synchronous rectified step-down switch mode converter. It offers very compact solutions to achieve 6A continuous output current and 9A peak current over a wide input supply range with excellent load and line regulation. The NB671 operates at high efficiency over a wide output current load range. Constant-On-Time (COT) control mode provides fast transient response and eases loop stabilization. Under voltage lockout is internally set as 4.6V, An open drain power good signal indicates the output is within its nominal voltage range. Full protection features include OCP, OVP, and thermal shut down. The converter requires minimum number of external components and is available in QFN16 (3mmx3mm) package.



  • Wide 5V to 24V Operating Input Range
  • 6A Continuous Output Current
  • 9A Peak Output Current
  • Low RDS(ON) Internal Power MOSFETs
  • Proprietary Switching Loss Reduction Technique
  • 1% Reference Voltage
  • 1.7ms Internal Soft Start
  • Output Discharge
  • 500kHZ Switching Frequency
  • OCP, OVP, UVP Protection and Thermal Shutdown
  • Output Adjustable from 0.604V to 5.5V


  • fsw (max) (kHz)500
  • Vin (min) (V)5
  • Vin (max) (V)24
  • Iout (max) (A)6
  • Isw Limit (typ) (A)9
  • Vfb (typ) (V)0.604
  • Iq (typ) (mA)0.16
  • Regulated Outputs1
  • Vout (max) (V)5.5
  • Vout (min) (V)0.604
  • GradeCatalog
  • PackageQFN-16 (3x3)
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special FeaturesOutput Discharge