SY20109BDFC - 400nA ultra low IQ, 1.0MHz, 1.0A continuous Synchronous Step Down Regulator


  • 2.4~6.0V Input Voltage Range
  • Ultra Low Quiescent Current Down to 400nA
  • Low RDS(ON) for the Internal Switches (Top/Bottom) 300mΩ /130mΩ
  • Instant PWM Control to Achieve the 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 SY20109B is a 400nA ultra low quiescent current, 1.0MHz synchronous step down DC/DC regulator, which is capable of delivering up to 1.0A output current. It can operate over a wide input voltage range from 2.4V to 6.0V 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 at 1.0MHz switching frequency.


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