SY20109DFC - 400nA ultra low IQ, 1.0MHz, 500mA Synchronous Step Down Regulator


  • 2.2~6.5V Input Voltage Range
  • Ultra Low Quiescent Current Down to 400nA
  • Low RDS(ON) for Internal Switches (Top/Bottom) 300mΩ /130mΩ
  • Instant PWM Control to Achieve Ultra Fast Load Transient Speed
  • High Switching Frequency 1.0MHz Minimizes the External Components
  • Internal Soft-start Limits the Inrush Current
  • Power Good Indicator
  • Hiccup Mode for Output Short Circuit Protection
  • 100% Drop Out Operation
  • Output Auto Discharge Function
  • RoHS Compliant and Halogen Free
  • Compact Package: DFN2×2-8

Typical Application


The SY20109 is a 400nA ultra low quiescent current, 1.0MHz synchronous step down DC/DC regulator capable of delivering up to 500mA output current. It can operate over a wide input voltage range from 2.2V to 6.5V and integrates main switch and 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 at 1.0MHz switching frequency.


  • Battery Powered Applications
  • Consumer and Portable Medical Products
  • Personal Ware Products