High Efficiency, Fast Transient, 3A, 20V Synchronous Step-Down Converter with 4.1V UVLO

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Product Description

The MP9181 is a fully-integrated, high-efficiency, synchronous, step-down, switch mode converter. It offers a very compact solution that can achieve 3A continuous output current over a wide input supply range with excellent load and line regulation. This device operates with high efficiency over a wide output-current load range. Constant-On-Time (COT) control mode provides fast transient response and eases loop stabilization. Full protection features include SCP, OCP, OVP, UVP, and thermal shut down. The MP9181 requires a minimal number of readily-available standard external components. This device is available in a space-saving 2mmx3mm 12-pin QFN package.


Product Features

  • Compatible with Intel Thunderbolt Specs
  • Wide 4.5V to 20V Operating Input Range
  • 3A Output Current
  • +/-1% VFB Voltage Tolerance
  • Low RDS(ON) Internal Power MOSFETs
  • Proprietary Switching Loss Reduction Technique
  • Up to 95% Peak Efficiency
  • High Light Load Efficiency
  • Soft Start-up/Shutdown
  • Programmable Switching Frequency
  • SCP, OCP, OVP,UVP Protection and Thermal Shutdown
  • Hiccup Mode during OCP
  • Power Good Indicator
  • Ultra-small (2mmx3mm)  QFN Package


  • fsw (max) (kHz)0
  • Vin (min) (V)4.5
  • Vin (max) (V)20
  • Iout (max) (A)3
  • Isw Limit (typ) (A)5
  • Max Duty Cycle (%)0.8
  • Vfb (V)0.815
  • Iq (typ) (mA)0.36
  • Regulated Outputs1
  • Vout (max) (V)13
  • Vout (min) (V)0.815
  • GradeCatalog
  • PackageQFN-12 (2x3)
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special FeaturesProgrammable Frequency, Soft Stop
Quality Policy, Certificates & Reliability Reports
All MPS parts are lead-free, halogen-free and adhere to the RoHS directive. See Environmental section for details.