SY21052AFCC - High Efficiency, 1.2A Continuous, 1.8A Peak, 85V Input Buck


  • Low RDS(ON) for Internal Switches (Top/Bottom): 500mΩ/240mΩ
  • 7-85V Input Voltage Range
  • 1.2A Continuous, 1.8A Peak Output Current Capability
  • Adjustable Switching Frequency
  • Instant PWM Architecture to Achieve Fast Transient Responses
  • Programmable Switching Frequency Range: 200~500 kHz
  • 2ms Internal Soft-start Limits the Inrush Current
  • Precious +/-2% 1.2V Reference
  • RoHS Compliant  and Halogen Free
  • Compact  Package: SO8E

Typical Application


SY21052 develops a high efficiency synchronous step down DC/DC regulator capable of delivering 1.2A continuous, 1.8A peak current. The SY21052 operates over a wide input voltage range from 7V to 85V and integrates a main switch and a synchronous switch with very low RDS(ON) to minimize the conduction loss.
The device adopts the instant PWM architecture to achieve fast transient responses for high step down applications.


  • Non-Isolated Telecommunication Buck Regulator
  • Secondary High Voltage Post Regulator
  • Automotive Systems