SY21266QXC -


·       Low RDS(ON) for Internal Switches (Top/Bottom): 7.5/2.5mΩ

·       Wide Input Voltage Range: 4-18V

·       External Bypass Input for Higher Light Load Efficiency

·       Instant PWM Architecture to Achieve Fast Transient Responses

·       Internal 1ms Soft-Start Limits the Inrush Current

·       Pseudo-Constant Frequency: 500khz

·       16A Output Current Capability

·       ±1.5% 0.6V Reference

·       Programmable Valley Current Limit

·       Power Good Indicator

·       Output Discharge Function

·       Hic-Cup Mode Output Short Circuit Protection

·       Input UVLO

·       Over Temperature Protection

·       Rohs Compliant and Halogen Free

·       Compact Package: QFN4x4-11

Typical Application


The SY21266 develops a high efficiency synchronous step-down DC/DC regulator capable of delivering 16A current. The device integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss. The SY21266 operate over a wide input voltage range from 4V to 18V.

The device 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/Net-TV/3DTV

·       Set Top Box

·       Notebook

·       High Power AP