Datasheet Summary
SY21109/SY21109E
High Efficiency, 4A, 18V Input Synchronous Buck Converter
General Description
Features
The SY21109x high efficiency synchronous buck converter operates over a wide input voltage range of 4.5V to 18V, and can deliver an output current up to 4A. It integrates a top MOSFET and a bottom MOSFET with very low RDS(ON) to minimize conduction loss. The 400kHz pseudo-constant switching frequency enables using small external inductor and capacitor values.
The SY21109x uses constant on-time and ripple-based control strategy to achieve fast transient response for applications with high step-down ratios, and high efficiency at light loads. It also provides cycle-by-cycle current...