SY21035FCC - High Efficiency, 0.6A, 100V Input Synchronous Step Down Regulator


  • Low RDS(ON) for Internal Switches (Top/Bottom): 500mΩ/285mΩ
  • 7~100V Input Voltage Range
  • 0.6A Output Current Capability
  • Constant On-time Control
  • Instant PWM Architecture to Achieve Fast Transient Responses
  • Programmable Switching Frequency Range: 200kHz~600kHz.
  • 2ms Internal Soft-start Limits the Inrush Current
  • Precise ±2% 1.225V Reference over
  • -40°C to +125°C Temperature Range
  • Cycle-by-cycle Peak Current Limit
  • Over Temperature Protection with Auto Recovery
  • RoHS Compliant and Halogen Free
  • Compact Package SO8E

Typical Application


The SY21035 develops a high efficiency synchronous step-down DC/DC converter capable of delivering 0.6A current. The SY21035 operates over a wide input voltage range from 7V to 100V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. The SY21035 always operates under continuous condition mode. The device adopts the instant PWM architecture to achieve fast transient responses for high step down applications.


  • Isolated Telecom Bias Supply
  • Secondary High Voltage Post Regulator
  • Automotive Systems