DESCRIPTION

The UTC UD18306 is an 3A synchronous step-down DC-DC

converter with an input voltage range of 4.5V to 18V. The UD18306

adopts the COT architecture to achieve fast transient responses for

high voltage step down applications. The UD18306 operates in pulse

skip mode that maintains high efficiency during light load operation.

The UD18306 features cycle-by-cycle current limit protection and

prevent the UD18306 from the catastrophic damage in output short

circuit, over current or inductor saturation. A build-in soft-start block

prevents inrush current during start up. The UD18306 also includes

input under-voltage lockout, input over-voltage protection, output

under-voltage protection, and over-temperature protection to provide

safe and smooth operation in all working conditions.

 FEATURES

* 4.5V to 18V Input Voltage Range

* 3A Available Load Current

* 580kHz Constant Switching Frequency

* Low RDS(ON) for Internal Switches:

High-side: 80mΩ

Low-side: 60mΩ

* Soft Start time: 1.2ms

* Advanced Constant On-Time Control

* Fast Transient Responses

* Input Under-Voltage Lockout

* Input Over-Voltage Protection

* Output Under-Voltage Protection

* Cycle-by-cycle Over Current Limit

* Short Circuit with Hiccup Mode

* Over-Temperature Protection

* Optimized for Low-ESR Ceramic Output Capacitors