SY20651THC - High Efficiency, Built-in Inductor, 2MHz, 1A, 18V Input Synchronous Step Down Regulator


  • Low RDS(ON) for Internal Switches (Top/Bottom): 130mΩ/120mΩ
  • 4.5-18V Input Voltage Range
  • 1A load Current Capability
  • 2% 0.6V Reference
  • Pseudo-constant Frequency:2MHz
  • Instant PWM Architecture to Achieve Fast Transient Responses.
  • Internal Soft-start Limits the Inrush Current
  • Current Limit Fold-back Mode Output Short Circuit Protection
  • Over Temperature Protection with Auto Recovery
  • Cycle-by-cycle Peak Current Limitation
  • Built-in 2.2µH Inductor
  • Power Good Indicator
  • Input UVLO
  • RoHS Compliant and Halogen Free
  • Compact Package: QFN2.5x2.5-8

Typical Application


The SY20651 is a high efficiency 2MHz synchronous step-down DC/DC converter capable of delivering 1A current, which integrates an inductor into a compact 2.5×2.5×2mm QFN package. The SY20651 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 SY20651 features enable control and power good indicator for system sequence control. The device also provides cycle-by-cycle current limit, short circuit protection and thermal shutdown protection for reliable operation.


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