DESCRIPTION

The UTC UD18307 is an easy-to-use, 1.1MHz, synchronous

step- down Buck converter, which integrated low on-resistance high

side and low-side power MOSFETs. The UTC UD18307 can deliver

3A continues output current efficiently with excellent load and line

regulation. The UTC UD18307 adopts constant-on-time (COT)

control operation, which provides very fast transient response, easy

loop design, and very tight output regulation. The UTC UD18307 has

built-in protection features, such as cycle-by-cycle current limit,

hiccup mode short-circuit protection, FB open/short protection and

thermal shutdown in case of excessive power dissipation. The UTC

UD18307 is available in an ultra- small SOT563 package and

requires a minimal number of readily available, standard, external

components.

FEATURES

* 4.3V to 18V Input Voltage Range Supporting

* 20V Absolute Maximum Rating

* 3A Continuous Output Current

* Output Adjustable from 0.8V

*105mΩ and 60mΩ Internal Power MOSFETs

* 110μA Low Quiescent Current

* 1.1MHz Switching Frequency

* High-Efficiency Synchronous Mode Operation

* Internal Soft Start (SS)

* Over-Current Protection (OCP) and Hiccup

* Power-Save Mode (PSM) at Light Load

* Thermal Shutdown Protection