SY21236RAC - High Efficiency Fast Response, 6A, 23V Input Synchronous Step Down Regulator


  • Low RDS(ON) for Internal Switches (Top/Bottom): 38/19 mΩ
  • Wide Input Voltage Range: 4-23V
  • Output Voltage Range: 0.6~2.5V
  • External  Bypass Input
  • Instant PWM Architecture to Achieve Fast Transient Responses
  • Internal 400μs Soft-start Limits the Inrush Current
  • Pseudo-constant Frequency: 500kHz
  • 6A Continuous/12A Peak Output Current Capability
  • ±1.0% 0.6V Reference
  • Programmable Valley Current Limit
  • Power Good Indicator
  • Output Discharge Function
  • Short Circuit Latch Off Protection
  • Over Voltage Latch Off  Protection
  • Thermal Shutdown
  • Input UVLO
  • RoHS Compliant and Halogen Free
  • Compact package: QFN3×3-20

Typical Application


The SY21236 develops a high efficiency synchronous step-down DC/DC regulator capable of delivering 6A continuous, 12A peak current. The device integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. The SY21236 also integrates a bypass switch which allows the IC to be powered by external DC source.

The SY21236 operates over a wide input voltage range from 4V to 23V. The DC-DC regulator adopts the instant PWM architecture to achieve fast transient responses for high step down applications and high efficiency at light loads. In addition, it operates at pseudo-constant frequency of 500kHz under heavy load conditions to minimize the size of inductor and capacitor. The SY21236 is optimized for lower than 2.5VOUT application.


  • LCD-TV/Net-TV/3DTV
  • Set Top Box
  • Notebook
  • High Power AP