SY20112ARC - High Efficiency, 1.2MHz, 3A Buck


  • 2.5V to 5.5V Input Voltage Range
  • 50μA Low Quiescent Current
  • Low RDS(ON) for Internal Switches (Top/Bottom) 100mΩ /60mΩ
  • High Switching Frequency 1.2MHz Minimizes the External Components
  • Internal Soft-start Limits the Inrush Current
  • 100% Dropout Operation
  • Hic-cup for Short Circuit Protection
  • Output Auto Discharge Function
  • RoHS Compliant and Halogen Free
  • Compact Package: SOT563

Typical Application


The SY20112 is a high efficiency 1.2MHz synchronous step down DC/DC regulator IC, which is capable of delivering up to 3A output currents. It can operate over a wide input voltage range from 2.5V to 5.5V and integrate main switch and synchronous switch with very low RDS (ON) to minimize the conduction loss.
The SY20112 is in a space saving, low profile SOT563 package.


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