SY21019ABC -


·       5-40V Input Voltage Range

·       2MHz Switching Frequency

·       Adaptive Constant OFF Time Control

·       Internal Soft-start Limits the Inrush Current

·       2% 0.6V Reference

·       RoHS Compliant and Halogen Free

·       Compact Package: SOT23-6

Typical Application


The SY21019 is a high efficiency 2MHz, adaptive constant OFF time controlled asynchronous step-down DC/DC regulator capable of delivering 300mA output current. The SY21019 operates over a wide input voltage range from 5V to 40V.

Low output voltage ripple and small external inductor and capacitor sizes are achieved with 2MHz switching frequency. 


·       Smart meter

·       Set Top Box

·       Portable TV

·       Access Point Router

·       DSL Modem

·       LCD TV