SY21147FCC -


·       Low RDS(ON) for Internal Switches (Top/Bottom): 130/90mΩ

·       4.5-23V Input Voltage Range

·       Instant PWM Architecture to Achieve Fast Transient Responses

·       Programmable Softstart Limits the Inrush Current

·       Pseudo-constant Frequency: 500khz

·      3AOutput Current Capability

·       1.5% 0.6V Reference

·       Rohs Compliant and Halogen Free

·       Compact Package: SO8E

Typical Application


SY21147 develops a high efficiency synchronous step-down DC/DC converter capable of delivering3Aoutput current. SY21147 operates over a wide input voltage range from 4.5V to 23V and integrates main switch and synchronous switch with very low RDS(ON) to minimize the conduction loss.

SY21147 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.


·       Set Top Box

·       Portable TV

·       Access Point Router

·       DSL Modem

·       LCD TV