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Home > Step Down Switching Regulators
UD05251 Datasheet


The UTC UD05251 is a 1.2MHz constant frequency current
mode PWM step-down converter. It is ideal for portable
equipment requiring very high current up to 2.5A from single-cell
Lithium-ion batteries while still achieving over 90% efficiency
during peak load conditions. The UTC UD05251 also can run at
100% duty cycle for low dropout operation, extending battery life
in portable systems while light load operation provides very low
output ripple for noise sensitive applications. The UTC UD05251
can supply up to 2.5A output current from a 2.6V to 4V input
voltage and up to 3A output current from a 4V to 5.5V input
voltage. The output voltage can be regulated as low as 0.8V. The
high switching frequency minimizes the size of external
components while keeping switching losses low. The internal
slope compensation setting allows the device to operate with
smaller inductor values to optimize size and provide efficient
operation. The UTC UD05251 is available in adjustable (0.8V to VIN) output voltage.

* 2.6V to 5.5V Input Voltage Range
* Output Voltages from 0.6V to VIN
* High Efficiency: Up to 94%
* 1.2MHz Constant Frequency Operation
* Output Current: 
 Up to 2.5A Output Current for VIN =2.6V~4V 
 Up to 3A Output Current for V IN=4V~5.5V
* No Schottky Diode Required
* Current Mode Operation for Excellent Line and Load Transient Response
* Current limit, Enable function
* Short Circuit Protect (SCP)
* Build-in Soft Start function
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