DESCRIPTION

The UTC UD05104 is a 1A high frequency synchronous Step

Down DC/DC converter using constant frequency, current mode

architecture. The device integrates main switch and synchronous

rectifier switch for high efficiency without an external schottky

diode. To maximize light load efficiency, The UTC  UD05104

draws only 30μA quiescent current to improve light load

efficiency. In shutdown, The UTC  UD05104 reduces supply

current less than 1μA. The UTC UD05104 can supply 1A of load

current from 2.5V to 6.0V input voltage. The output voltage can

be regulated as low as 0.6V. The switching frequency is internally

set at 2.25MHz, as for operation mode: UTC  UD05104 is

automatic PSM/PWM mode.  

The UTC  UD05104  has built-in internal Soft Start, Short

Circuit Protection and OTP functions, allowing the use of small

surface mount inductors and capacitor.

FEATURES

* Input Voltage Range from 2.5V to 6.0V

* +/-2% 0.6V Feedback Voltage Accuracy

* 2.25MHz Switching Frequency      

* Continuous Output Current up to 1A

* Low Quiescent Current of 30µA

* 0.1μA Shutdown Current

* 100% Duty Cycle Operation

* Built-in 170mΩ/150mΩ Power Switch

* Internal Soft-Start

* Cycle-by-Cycle Current Limit Protection

* Over-Load and Hiccup Mode Short Circuit

* Thermal Shutdown Protection