SY21081BABC - High Efficiency Fast Response, 2A, 18V Input 1.2MHz Synchronous Step Down Regulator


  • Low RDS(ON) for Internal Switches (top/bottom):170/160 mΩ
  • 4.35-18V Input Voltage Range
  • 2A Load Current Capability
  • Instant PWM Architecture to Achieve Fast Transient Responses
  • Internal Softstart Limits the Inrush Current
  • 2% 0.6V Reference
  • RoHS Compliant and Halogen Free
  • Compact Package: SOT23-6

Typical Application


SY21081B develops high efficiency synchronous step-down DC-DC converter capable of delivering2Aload current. SY21081B operates over a wide input voltage range from 4.35V to 18V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.

SY21081B always operates under continuous condition mode, low output ripple and small inductor and capacitor size are achieved with 1.2MHz switching frequency.


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