3A, 5.5V, 1.2MHz, 40µA Iq, COT Synchronous Step-Down Switcher

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Product Description

The MP2143 is a monolithic, step-down, switch-mode converter with internal power MOSFETs. It can achieve up to 3A continuous output current from a 2.5V–to-5.5V input voltage with excellent load and line regulation. The output voltage can be regulated as low as 0.6V.  Constant-on-time control provides fast transient response and eases loop stabilization. Fault-condition protections include cycle-by-cycle current limiting and thermal shutdown.  The MP2143 is available in small TSOT23-8 package and requires only a minimal number of readily-available standard external components.  The MP2143 is ideal for a wide range of applications including high-performance DSPs, FPGAs, smartphones, portable instruments, and DVD drivers.


Product Features

  • Wide 2.5V-to-5.5V Operating Input Range
  • Output Voltage as Low as 0.6V
  • 100% Duty Cycle in Dropout
  • Up to 3A Output Current
  • Low IQ: 40µA
  • 80mΩ and 40mΩ Internal Power MOSFET Switches
  • Default 1.2MHz Switching Frequency
  • EN and Power-Good for Power Sequencing
  • Cycle-by-Cycle Over-Current Protection
  • Auto Discharge at Power Off
  • Short-Circuit Protect with Hiccup Mode
  • Stable with Low-ESR Output Ceramic Capacitors
  • Available in a TSOT23-8 Package


  • fsw (max) (kHz)1200
  • Vin (min) (V)2.5
  • Vin (max) (V)5.5
  • Iout (max) (A)3
  • Isw Limit (typ) (A)4.8
  • Max Duty Cycle (%)1
  • Vfb (typ) (V)0.6
  • Iq (typ) (mA)0.04
  • Regulated Outputs1
  • Vout (max) (V)5
  • Vout (min) (V)0.6
  • GradeCatalog
  • PackageTSOT23-8
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special Features100% Duty Cycle, Soft Stop