High Efficiency, 1A, 6V, 1.5MHz, 17uA Iq, COT Synchronous Step Down Converter with PG in Ultra-small 2x1.5mm QFN



The MP2158 is a monolithic step-down switch mode converter with built-in internal power MOSFETs. It achieves 1A continuous output current from a 2.5V to 6V input voltage with excellent load and line regulation. The output voltage can be regulated as low as 0.6V. The Constant-On-Time control scheme provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. The MP2158 is available in the small QFN8 2.0x1.5mm package and requires a minimum number of readily available standard external components. The MP2158 is ideal for a wide range of applications including High Performance DSPs, FPGAs, PDAs, and portable instruments.



  • Very Low IQ: 17μA
  • Default 1.5MHz Switching Frequency
  • EN and Power Good for Power Sequencing
  • Ultra-small 2.0x1.5mm QFN8 Package
  • Wide 2.5V to 6V Operating Input Range Output Adjustable from 0.6V
  • Up to 1A Output Current
  • 118mΩ and 88mΩ Internal Power MOSFET Switches
  • Cycle-by-Cycle Over Current Protection
  • Short Circuit Protect with Hiccup Mode
  • Stable with Low ESR Output Ceramic Capacitors


  • fsw (max) (kHz)1500
  • Vin (min) (V)2.5
  • Vin (max) (V)6
  • Iout (max) (A)1
  • Isw Limit (typ) (A)2
  • Max Duty Cycle (%)1
  • Vfb (V)0.6
  • Iq (typ) (mA)0.017
  • Regulated Outputs1
  • Vout (min) (V)0.6
  • GradeCatalog
  • PackageQFN-8 (2.0x1.5)
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special Features100% Duty Cycle