SY20018A1AAC - High Efficiency, 1.5MHz, 1A Buck


  • 2.5V to 5.5V Input Voltage Range
  • 50μA Low Quiescent Current
  • Low RDS(ON) for Internal Switches (Top/Bottom): 260mΩ /160mΩ
  • High Switching Frequency 1.5MHz Minimizes the External Components
  • Internal Soft-start Limits the Inrush Current
  • 100% Dropout Operation
  • Reliable Short Circuit Protection
  • Without Output Auto Discharge Function
  • RoHS Compliant and Halogen Free
  • Compact Package: SOT23-5

Typical Application


The SY20018A1 is a high efficiency 1.5MHz synchronous step down DC/DC regulator, which is capable of delivering up to 1A output current. It can operate over a wide input voltage range from 2.5V to 5.5V and integrate a main switch and a synchronous switch with very low RDS(ON) to minimize the conduction loss.
The low output voltage ripple, the small external inductor and the capacitor sizes are achieved with 1.5MHz switching frequency.


  • Set Top Box
  • USB Dongle
  • Media Player
  • Smart Phone