3A, 16V, 500kHz, Step-Down Converter with external SS



The MP1497S is a high-frequency, synchronous, rectified, step-down switch mode converter with built in internal power MOSFETs. It offers a very compact solution to achieve 3A continuous output current with excellent load and line regulation over a wide input supply range. The MP1497S has synchronous mode operation for higher efficiency over the output current load range. 
Current-mode operation provides a fast transient response and eases loop stabilization.
Protective features include over-current protection, thermal shutdown, and external SS control. 
The MP1497S requires a minimal number of readily-available external components and is available in a space-saving 8-pin TSOT23 package.



  • Wide 4.5V-to-16V Operating Input Range
  • 120mΩ/50mΩ Low RDS(ON) Internal Power MOSFETs
  • Proprietary Switching-Loss–Reduction Technique
  • High-Efficiency Synchronous Mode Operation
  • Fixed 500kHz Switching Frequency
  • Can Synchronize to a 300kHz-to-2MHz External Clock
  • Externally-Programmable Soft-Start
  • OCP and Hiccup
  • Thermal Shutdown
  • Output Adjustable from 0.8V
  • Available in an 8-pin TSOT23 Package


  • fsw (max) (kHz)500
  • Vin (min) (V)4.5
  • Vin (max) (V)16
  • Iout (max) (A)3
  • Isw Limit (typ) (A)5
  • Max Duty Cycle (%)0.95
  • Vfb (V)0.807
  • Iq (typ) (mA)0.7
  • Regulated Outputs1
  • Vout (max) (V)15.2
  • Vout (min) (V)0.8
  • GradeCatalog
  • PackageTSOT23-8
  • Control ModeCurrent Mode
  • Common FeaturesExternal Soft Start, Synchronous Rectification
  • Special FeaturesExternal Frequency Sync