SY21114EADC - High Efficiency, 3.0A, 18V Input Synchronous Step Down Regulator


  • Low RDS(ON) for Internal Switches (Top/Bottom): 80mΩ/40mΩ
  • 4.2-18V Input Voltage Range
  • 3A Output Current Capability
  • PWM Operation Only
  • 600kHz Switching Frequency Minimize the External Components
  • Stable with 10μF COUT and 2.2μH Inductor
  • Instant PWM Architecture to Achieve Fast Transient Responses
  • Internal Soft-start Limits the Inrush Current
  • Startup from Pre-biased Output
  • Cycle-by-cycle Peak/Valley Current Limitation
  • Hic-cup Mode Output Short Circuit Protection
  • Over Temperature Protection with Auto Recovery
  • Output Auto Discharge Function
  • ±1.0% Internal Reference Voltage
  • RoHS Compliant and Halogen Free
  • Compact Package: TSOT23-6

Typical Application


The SY21114E develops high efficiency 600kHz synchronous step-down DC/DC converter capable of delivering 3A current. The device operates over a wide input voltage range from 4.2V to 18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.

The SY21114E adopts the instant PWM architecture to achieve fast transient responses for high step down applications. In addition, it operates at pseudo-constant frequency of 600kHz to minimize the size of the inductor and the capacitor.


  • Set Top Box
  • Portable TV
  • DSL Modem
  • LCD TV
  • IP CAM
  • Networking