DESCRIPTION

The UTC UU28121 is a current mode step up converter

intended for small, low power applications. 

The converter input voltage ranging from 2.5V to 5.5V. The

Output voltage can be set up to 28V. The frequencyis 1.2MHz

allows the use of small external inductors and capacitors and

provides fast transient response. Internal soft start results in small

inrush current and extends battery life. Internalpower MOSFET

with very low RDS (ON) provides high efficiency. The UTC

UU28121 automatically transits from PWM to PFM during light load

condition further increasing efficiency. The converter also provides

protection functions such as under-voltage lockout, current limit

and thermal shutdown.

FEATURES

* 2.5V~5.5V operating input voltage range 

* 1.2MHz Fixed Switching Frequency 

* Adjustable output voltage range up to 28V 

* Internal 1.2A switching current limit 

* Internal Soft-start Function 

* Current limit and Thermal shutdown protection 

* Under voltage Lockout