SY20111BDQC - High Efficiency 3MHz, 1A Buck


  • Low RDS(ON) for internal switches (top/bottom) 230mΩ/150mΩ
  • 2.5~5.5V input voltage range
  • Fixed output voltage:1.5VOUT
  • High switching frequency 3MHz minimizes the external components
  • Internal soft-start limits the inrush current
  • 100% dropout operation
  • RoHS Compliant and Halogen Free
  • Output auto discharge function
  • Compact package: DFN1.5x1.5-6

Typical Application


SY20111B is a high efficiency 3MHz synchronous step down DC/DC regulator IC 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 main switch and synchronous switch with very low RDS (ON) to minimize the conduction loss.


  • Portable Navigation Device
  • Set Top Box
  • USB Dongle
  • Media Player
  • Smart phone