500MA HIGH EFFICIENCY BOOST REGULATOR WITH ADJUSTABLE OUTPUT, SHUTDOWN AND LOW BATTERY DETECT

DESCRIPTION

The UC3555 is a micropower step-up DC/DC in 8-lead TSSOP

package. It is designed for 2-cell battery powered systems such as

digital cameras, cell phones and PDAs. The regulator starts-up at

1.3V and operates after the start at an input voltage as low as 1V. A

Minimum off-time, variable on-time control scheme provides high

efficiency over a wide range of load conditions. The combination of

build-in power transistors, synchronous rectification, low battery

detection and low supply current, make the UC3555 ideal for

portable applications.

FEATURES

* Low power PFM step-up DC/DC

* Low input voltage range from 1.6V to 4.5V

* Adjustable output voltage from 3V to 5V

* 500mA output current

* 95% peak Efficiency

* internal synchronous rectifier

* Low battery detection

* Current limited protection

* Current Anti-Drawback protection