DESCRIPTION

The UTC UD05103 is a high-frequency, synchronous, rectified,
step-down, switch-mode converter with internal power MOSFETs.
It offers a very compact solution to achieve a 1A continuous
output current over from 2.5V to 5.5V input supply range, with
excellent load and line regulation.
The UTC UD05103 is ideally suited for portable electronic
devices that are powered from 1-cell Li-ion battery or from other
power sources such as cellular phones, PDAs, handheld devices,
game console and related accessories.
The output voltage is adjustable from 0.6V to the input voltage.
During shutdown, the input is disconnected from the output and the
shutdown current is less than 1μA. Other key features include
over-temperature and short circuit protection, and under-voltage
lockout to prevent deep battery discharge.
The UTC UD05103 at 1A maximum output current while
consuming only 40μA of no-load quiescent current. Ultra-low
RDS(ON) integrated MOSFETs and 100% duty cycle operation make
the UTC UD05103 an ideal choice for high-output voltage,
high-current applications which require a low dropout threshold.

FEATURES

* Output Current : Up to 1 A
* Output Voltage : 0.6V to VIN
* Input Voltage : 2.5V to 5.5V
* Low-RDS(ON) Internal Power MOSFETs.
* High-Efficiency Synchronous-Mode Operation, up to 95%
* 40μA (typ.) No Load Quiescent Current
* Shutdown Current < 1μA
* 100% Duty Cycle Operation
* Fixed 1.0MHz Switching Frequency.
* Current Mode Operation
* Internal Soft-Start.
* Current Limit Protection
* Over-temperature Protection.
* Input Under Voltage Lockout (UVLO)