SY21034ADC - High Efficiency, 200kHz, 100V Input, 0.6A Asynchronous Step Down Regulator


  • Low RDS(ON) for Internal N-channel Power FET:1Ω
  • 4.5-100V Input Voltage Range
  • 0.6A Output Current Capability
  • 200kHz Pseudo Constant Switching Frequency
  • Internal Soft-start Limits the Inrush Current
  • Hic-cup Mode Output Short Circuit Protection
  • EN ON/OFF Control with Accurate Threshold
  • Cycle by Cycle Peak Current Limit
  • 0.6V±1 % Reference Voltage
  • TSOT23-6  Package      

Typical Application


SY21034 is a high efficiency, current mode adaptive constant off time controlled asynchronous step-down DC/DC converter capable of delivering 0.6A output current. The SY21034 operates over a wide input voltage range from 4.5V to 100V and integrates main switch with very low RDS(ON) to minimize the conduction loss.


  • Non-isolated Telecommunication Buck Regulator
  • Secondary High Voltage Post Regulator
  • Automotive Systems
  • Electric Bicycle