DESCRIPTION

The UTC UD05104A 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
UD05104A draws only 30μA quiescent current to improve light
load efficiency. In shutdown, The UTC UD05104A reduces supply
current less than 1μA. The UTC UD05104A 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 1MHz, as for operation mode: UTC UD05104A is automatic
PSM/PWM mode.
The UTC UD05104A 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
* 1MHz 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