Wide Vin 5-24V, 10A, COT Synchronous Step-down Converter with +/-1.5A LDO and Buffered Reference



The NB675 provides a complete power supply for DDR3, DDR3L and LPDDR2 memory with the highest power density. It integrates a high frequency synchronous rectified step-down switch mode converter (VDDQ) with an 1.5A sink/source LDO (VTT) and buffered low noise reference (VTTREF). The fully integrated Buck converter is able to deliver 10A continuous output current and 12A peak output current over a wide input supply range with excellent load and line regulation. The Buck converter employs the Constant-On-Time (COT) control scheme, which provides fast transient response and eases loop stabilization. The VTT LDO provides 1.5A sink/source current capability and requires only 10uF ceramic capacitance. The VTTREF tracks VDDQ/2 with an excellent 1% accuracy. Under voltage lockout is internally set as 4.5V. An open drain power good signal indicates VDDQ is within its nominal voltage range. Full protection features include OCP, OVP, and thermal shut down. This part requires minimum number of external components and is available in QFN21 (3mmx4mm) package.



  • Wide 5V to 24V Operating Input Range
  • 10A Continuous Output Current
  • 12A Peak Output Current
  • Built-in +/- 1.5A VTTLDO
  • Low RDS(ON) Internal Power MOSFETs
  • Proprietary Switching Loss Reduction Technique
  • Internal Soft Start
  • Output Discharge
  • 500kHZ Switching Frequency
  • OCP, OVP, UVP Protection and Thermal Shutdown
  • VDDQ Adjustable from 0.604V to 5.5V


  • fsw (max) (kHz)500
  • 最小输入电压5
  • Vin (max) (V)24
  • Iout (max) (A)10
  • Isw Limit (typ) (A)11
  • Vfb (typ) (V)0.604
  • Iq (typ) (mA)0.4
  • 额定输出1
  • Vout (max) (V)5.5
  • Vout (min) (V)0.604
  • GradeCatalog
  • PackageQFN-21 (3x4)
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special FeaturesOutput Discharge