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Home > Step Down Switching Regulators
UD05121 Datasheet






The UTC UD05121 is a monolithic synchronous buck regulator

with a built in internal power MOSFET. It achieves 1.2A continuous

output current fix switching frequency with excellent load and line


Current mode operation provides fast transient response and

eases of loop stabilization.

Fault condition protection includes cycle-by-cycle current

limiting, output short circuit protection and thermal shutdown. In

shutdown mode the regulator draws less than 1μA of supply

current. Internal soft-start minimizes the inrush supply current at

initial startup.

The UTC UD05121 requires a minimum number of readily

available standard external components.




* 2.5V~5.5V input voltage range

* Up to 1.2A Output Current

* 300/200mΩ Internal Power MOSFET Switch

* Stable with Low ESR Output Ceramic Capacitors

* Up to 95% Efficiency

* Less than 1μA Shutdown Current

* 1.5Mhz Switching Frequency

* Thermal Shutdown Protection

* Current limit and short circuit protections.

* Output Adjustable from 0.6V to VIN

* Build-in soft start function

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