SY21036ABC - High Efficiency, 1A 40V Input Buck


  • Low RDS(ON) for Internal Switches (Top/Bottom):380mΩ/180mΩ
  • 4.5-40V Input Voltage Range
  • 1A Output Current Capability
  • 2MHz Fixed Switching Frequency
  • 0.8V±1.0% Reference Voltage
  • Low Quiescent Current
  • Internal Soft-start Limits the Inrush Current
  • Hic-cup Mode Output Short Circuit Protection
  • Thermal Shutdown and Auto Recovery
  • Compact Package: SOT23-6

Typical Application


The SY21036 develops a high efficiency synchronous step-down DC/DC converter capable of delivering 1A load current. The SY21036 operates over a wide input voltage range from 4.5V to 40V and integrates main switch and synchronous switch with low RDS(ON) to minimize the conduction loss.
The SY21036 adopts peak current control scheme. The switching frequency is 2MHz. Low output voltage ripple and small external inductor and capacitor sizes are achieved with 2MHz switching frequency.
The device also features ultra low quiescent operating to achieve high efficiency under light load. And the internal soft-start limits inrush current during power on.


  • LCD-TV
  • SetTop Box
  • Notebook
  • Storage
  • High Power AP Router
  • Networking