7A, 25V, 580KHz Step-Down Converter with Synchronizable Gate Driver



The NB619 is a high frequency synchronous rectified step-down switch mode converter with a built in internal high side power MOSFET. It offers a very compact solution to achieve 7A continuous output current over a wide input, load and line range. Current mode operation provides fast transient response and eases loop stabilization. Full protection features include OCP and thermal shut down. The NB619 requires a minimum number of readily available standard external components and is available in a space saving 3mm x 4mm 14-pin QFN package.



  • Only 9 External Components
  • Wide 4.5V to 25V Operating Input Range
  • 7A Output Current
  • Internal High Side Power MOSFET
  • Fixed 580kHz Switching Frequency
  • Sync from 300kHz to 2MHz External Clock
  • Internal Compensation
  • Power Good Output
  • Integrated Bootstrap Diode
  • OCP Protection and Thermal Shutdown
  • Output Adjustable from 0.8V to 15V
  • Available in 3mm x 4mm 14-pin QFN package


  • fsw (max) (kHz)580
  • 最小输入电压4.5
  • Vin (max) (V)25
  • Iout (max) (A)7
  • Isw Limit (typ) (A)9.5
  • Max Duty Cycle (%)0.9
  • Vfb (typ) (V)0.808
  • Iq (typ) (mA)0.7
  • 额定输出1
  • Vout (max) (V)15
  • Vout (min) (V)0.808
  • GradeCatalog
  • PackageQFN-14 (3x4)
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special Features外部频率同步