SY20122IABC - High Efficiency, 1.5MHz, 2A Buck


  • 2.5V to 5.5V Input Voltage Range
  • 50μA Low Quiescent Current
  • Low RDS(ON) for Internal Switches (Top/Bottom) 130mΩ /85mΩ
  • High Switching Frequency 1.5MHz Minimizes the External Components
  • Internal Soft-start Limits the Inrush Current
  • 100% Dropout Operation
  • Power Good Indicator
  • Reliable Latch off Function When:Output Short/Thermal Shutdown
  • Output Voltage>120% of Regulated Voltage
  • Output Auto Discharge Function
  • RoHS Compliant and Halogen Free
  • Compact Package: SOT23-6

Typical Application


The SY20122I is a high efficiency 1.5MHz synchronous step down DC/DC regulator, which is capable of delivering up to 2A output current. 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 SY20122I integrates reliable latch off function when output over voltage, output short or thermal shutdown happens.

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