17V, 3A, 800kHz, High-Efficiency, Synchronous, Step-Down Converter with COT Control in SOT563 Package

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Product Description

The MP1477 is a fully integrated, high-frequency, synchronous, rectified, step-down, switch-mode converter with internal power MOSFETs. The MP1477 offers a very compact solution that achieves 3A of continuous output current with excellent load and line regulation over a wide input range. The MP1477 uses synchronous mode operation for higher efficiency over the output current-load range.
Constant-on-time (COT) control operation provides very fast transient response, easy loop design, and very tight output regulation.
Full protection features include short-circuit protection (SCP), over-current protection (OCP), under-voltage protection (UVP), and thermal shutdown.
The MP1477 requires a minimal number of readily available, standard, external components and is available in a space-saving SOT563 (1.6mmх1.6mm) package.


Product Features

  • Wide 4.2V to 17V Operating Input Range
  • 58mΩ/27mΩ Low RDS(ON) Internal Power MOSFETs
  • 200µA Low IQ Current
  • High-Efficiency Synchronous Mode Operation
  • Power Save Mode (PSM) at Light Load
  • Fast Load Transient Response
  • 800kHz Switching Frequency
  • Internal Soft Start (SS)
  • Over-Current Protection (OCP) and Hiccup
  • Thermal Shutdown
  • Output Adjustable from 0.8V
  • Available in a SOT563 (1.6mmх1.6mm) Package


  • fsw (max) (kHz)800
  • Vin (min) (V)4.2
  • Vin (max) (V)17
  • Iout (max) (A)3
  • Isw Limit (typ) (A)4
  • Vfb (typ) (V)0.805
  • Iq (typ) (mA)0.2
  • Regulated Outputs1
  • Vout (max) (V)10
  • Vout (min) (V)0.8
  • GradeCatalog
  • PackageSOT563
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Synchronous Rectification

Reference Materials