4A, 5.5V, 1.2MHz, High Efficiency, COT Synchronous Step-Down Converter with PG and Auto Discharge



The MP2131 is a monolithic step-down, switch- mode converter with built-in internal power MOSFETs. It achieves a 4 A continuous output current from a 2.7 V to 5.5 V input voltage with excellent load and line regulation. The MP2131 is ideal for powering portable equipment that run from a single cell lithium-ion (Li+) battery. The output voltage is regulated as low as 0.6 V.
The constant-on-time (COT) control scheme provides fast transient response, high light-load efficiency, and eases loop stabilization.
Fault condition protection includes cycle­by­cycle current limit and thermal shutdown. 
The MP2131 requires a minimum number of readily available, standard, external components and is available in an ultra-small QFN-12 (2mm x 2mm) package.
The MP2131 is ideal for a wide range of applications including portable instruments, small handheld and battery–powered devices, PDAs, and DVD drives.



  • Wide 2.7 V to 5.5 V Operating Input Range
  • Output Voltage as Low as 0.6 V
  • 4 A Output Current
  • 35 mΩ and 18 mΩ Internal Power MOSFET
  • Above 96% Peak Efficiency
  • Above 80% Light Load Efficiency
  • Low IQ: 19 μA
  • 1.2 MHz Frequency
  • 100% Duty Cycle in Dropout
  • 0.5 ms Internal Soft-Start Time
  • EN and Power Good for Power Sequencing
  • Auto Discharge at EN Off
  • Short-Circuit Protection with Hiccup Mode
  • Available in a QFN-12 (2mm x 2mm) Package


  • fsw (max) (kHz)1200
  • Vin (min) (V)2.7
  • Vin (max) (V)5.5
  • Iout (max) (A)4
  • Isw Limit (typ) (A)7.5
  • Max Duty Cycle (%)1
  • Vfb (V)0.6
  • Iq (typ) (mA)0.019
  • Regulated Outputs1
  • Vout (min) (V)0.6
  • GradeCatalog
  • PackageQFN-12 (2x2)
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special Features100% Duty Cycle, Soft Stop