SY21061FABC - High Efficiency, 300kHz, 36V Input, 1.2A Asynchronous Step Down Regulator


  • 9-36V Input Voltage Range
  • Low RDS(ON) for Internal N-channel Power FET: 180 mΩ
  • 300kHz Switching Frequency
  • Adaptive Constant OFF Time Control
  • Internal Soft-start Limits the Inrush Current
  • 2% 0.81V Reference
  • RoHS Compliant and Halogen Free
  • Compact Package: SOT23-6

Typical Application


The SY21061F is a high efficiency 300kHz, adaptive constant OFF time controlled asynchronous step-down DC/DC regulator capable of delivering 1.2Aoutput current respectively. The SY21061F can operate over a wide input voltage range from 9V to 36V and integrates the main switch with very low RDS(ON) to minimize the conduction loss.

Low output voltage ripple and small external inductor and capacitor sizes are achieved with 300kHz switching frequency.


  • Set Top Box
  • Portable TV
  • Access Point Router
  • DSL Modem
  • LCD TV