SY21072E1ABC - High Efficiency, Fast Response, 2.0A, 18V Input Synchronous Step Down Regulator


  • Low RDS(ON) for Internal Switches (Top/Bottom): 130mΩ/105mΩ
  • 4.5-18V Input Voltage Range
  • 2A Output Current Capability
  • 500kHz Switching Frequency Minimize the External Components
  • Stable with 10µF COUT and 1.5µH Inductor
  • Instant PWM Architecture to Achieve Fast Transient Responses
  • Internal Soft-start Limits the Inrush Current
  • Forced PWM Operation
  • Cycle-by-cycle Peak/Valley Current Limitation
  • Hic-cup Mode Output Short Circuit Protection
  • Thermal Shutdown with Auto Recovery
  • Compact Package SOT23-6

Typical Application


The SY21072E1 is a high efficiency, synchronous step-down DC/DC converter capable of delivering 2A load current. The SY21072E1 operates over a wide input voltage range from 4.5V to 18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.

The SY21072E1 adopts the instant PWM architecture to achieve fast transient responses for high step down applications. In addition, it operates at pseudo-constant frequency of 500kHz to minimize the size of inductor and capacitor.


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