1.25A, 5.5V Synchronous Step-Down Switching Regulator

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Product Description

The MP28127 is an internally compensated 1.5MHz fixed frequency PWM synchronous step-down regulator. MP28127 operates from a 2.7V to 5.5V input and generates an output voltage as low as 0.8V. The MP28127 integrates a high side switch and a synchronous rectifier for high efficiency without an external Schottky diode. With peak current mode control and internal compensation, the MP28127 based solution delivers a very compact footprint with a minimum component count. The MP28127 is available in a small 3mm x 3mm 10-lead QFN package.


Product Features

  • 1.25A Output Current
  • Input Operation Range: 2.7V to 5.5V
  • All Ceramic Capacitor Design
  • 1.5MHz Fixed Switching Frequency
  • Adjustable Output from 0.8V to 0.9xVIN
  • Internal Soft-Start
  • Frequency Synchronization Input
  • Power Good Output
  • Thermal Shutdown
  • Cycle-by-Cycle Current Limiting
  • Hiccup Short Circuit Protection
  • 3x3mm 10-Lead QFN Package


  • fsw (max) (kHz)1500
  • Vin (min) (V)2.7
  • Vin (max) (V)5.5
  • Iout (max) (A)1.25
  • Isw Limit (typ) (A)2
  • Max Duty Cycle (%)0.9
  • Vfb (V)0.8
  • Iq (typ) (mA)0.75
  • Regulated Outputs1
  • Vout (max) (V)5
  • Vout (min) (V)0.8
  • GradeCatalog
  • PackageQFN-10 (3x3)
  • Control ModeCurrent Mode
  • Common FeaturesPower Good, Synchronous Rectification
  • Special FeaturesExternal Frequency Sync

Reference Materials