SY21211DNC - High Efficiency Fast Response,5A, 30V Input Synchronous Step Down Regulator


·       Low RDS(ON) for Internal Switches (Top/Bottom): 70/40mΩ

·       4.5-30V Input Voltage Range

·       Instant PWM Architecture to Achieve Fast Transient Responses

·       External Softstart Limits the Inrush Current

·       Pseudo-Constant Frequency: 500kHz at Heavy Loads

·       5A Continuous, 6A Peak Load Current Capability

·       1.5% 0.6V Reference

·       Output Over Current Limit

·       Output Short Circuit Protection with Current Fold Back

·       Thermal Shutdown and Auto Recovery

·       Rohs Compliant and Halogen Free

·       Compact Package: DFN3x4-12/SO8E

Typical Application


SY21211 develops a high efficiency synchronous step down DC/DC converter capable of delivering 5A output current. SY21211 operates over a wide input voltage range from 4.5V to 30V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.

SY21211 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 continuous conduction mode to minimize the size of inductor and capacitor.


·       LCD-TV

·       SetTop Box

·       Notebook

·       Storage

·       High power AP router

·       Networking