SY21041ABC -


·       Low RDS(ON) for Internal Switches (Top/Bottom): 350/150 mΩ

·       4.5-27V Input Voltage Range

·       Instant PWM Architecture to Achieve Fast Transient Responses

·        Internal Soft-start Limits the Inrush Current

·       2% 0.6V Reference

·       RoHS Compliant and Halogen Free

·       Compact Package: SOT23-6

Typical Application


SY21041 develops high efficiency synchronous step-down DC/DC converter capable of delivering 1A. SY21041 operates over a wide input voltage range from 4.5V to 27V and integrate main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.

SY21041 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 500 kHz under heavy load conditions to minimize the size of inductor and capacitor.


·       Set Top Box

·       Portable TV

·       Access Point Router

·       DSL Modem

·       LCD TV