1A, 5.5V, 2.2MHz, 11µA Iq, High Efficiency Synchronous Step-Down Converter with Output Discharge in SOT563

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Product Description

The MP1601 is a monolithic, step-down, switch-mode converter with built-in, internal power MOSFETs. It can achieve 1A of continuous output current from a 2.3V-to-5.5V input voltage range with excellent load and line regulation. The output voltage can be regulated as low as 0.6V.
The constant-on-time control scheme provides a fast transient response and eases loop stabilization. Fault protections include cycle-by-cycle current limiting and thermal shutdown. 
The MP1601 is available in an ultra-small SOT563 package and requires a minimal number of readily available, standard, external components.
The MP1601 is ideal for a wide range of applications including high-performance DSPs, wireless power, portable and mobile devices, and other low-power systems.


Product Features

  • Low Quiescent Current: 11μA
  • 2.2MHz Switching Frequency
  • EN for Power Sequencing
  • Power Good Only for Fixed Output Version
  • Wide 2.3V-to-5.5V Operating Input Range
  • Output Adjustable from 0.6V
  • Up to 1A of Output Current
  • 160mΩ and 120mΩ Internal Power MOSFET Switches
  • Output Discharging
  • Short-Circuit Protection (SCP) with Hiccup Mode
  • Stable with Low ESR Output Ceramic Capacitors
  • 100% Duty Cycle
  • Available in a SOT563 Package


  • fsw (max) (kHz)2200
  • Vin (min) (V)2.3
  • Vin (max) (V)5.5
  • Iout (max) (A)1
  • Isw Limit (typ) (A)2.4
  • Max Duty Cycle (%)1
  • Vfb (typ) (V)0.6
  • Iq (typ) (mA)0.011
  • Regulated Outputs1
  • Vout (max) (V)5.5
  • Vout (min) (V)0.6
  • GradeCatalog
  • PackageSOT563
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special Features100% Duty Cycle, Fixed Output, Output Discharge

Reference Materials