High Efficiency, 1A, 6V, 1.5MHz, 17uA Iq, COT Synchronous Step Down Converter with better Vfb accuracy and better load regulation in TSOT23-8



The MP2159A is a monolithic step-down, switch-mode converter with built-in power MOSFETs. It achieves a 1 A continuous output current from a 2.5 V to 6 V input voltage range with excellent load and line regulation. The output voltage can be regulated as low as 0.6 V.
The constant-on-time (COT) control scheme provides fast transient response and eases loop stabilization. Fault condition protection includes cycle-by-cycle current limiting and thermal shutdown. 
The MP2159A is available in a small TSOT23-8 package and requires a minimum number of readily available, standard, external components.
The MP2159A is ideal for a wide range of applications including high-performance DSPs, FPGAs, PDAs, and portable instruments.



  • Very Low IQ: 17 μA
  • Default 1.5 MHz Switching Frequency
  • 1.5% VFB Accuracy
  • EN and Power Good for Power Sequencing
  • Wide 2.5 V to 6 V Operating Input Range
  • Output Adjustable from 0.6 V
  • Up to 1 A Output Current
  • 100% Duty Cycle in Dropout
  • 120 mΩ and 90 mΩ Internal Power MOSFET Switches
  • Cycle-by-Cycle Over-Current Protection
  • Short-Circuit Protection with Hiccup Mode
  • Stable with Low ESR Output Ceramic Capacitors
  • Available in a TSOT23-8 Package


  • fsw (max) (kHz)1500
  • Vin (min) (V)2.5
  • Vin (max) (V)6
  • Iout (max) (A)1
  • Max Duty Cycle (%)1
  • Vfb (V)0.6
  • Iq (typ) (mA)0.017
  • Regulated Outputs1
  • Vout (max) (V)6
  • Vout (min) (V)0.6
  • GradeCatalog
  • PackageTSOT23-8
  • Control ModeCOT
  • Common FeaturesLight-Load Efficiency, Power Good, Synchronous Rectification
  • Special Features100% Duty Cycle