Datasheet

Setting the Output Voltage
The output voltage can be measured using a multimeter. Turning the potentiometer clockwise increases
the output voltage. The output voltage can be affected by a screwdriver touching the potentiometer, so
the output measurement should be done with nothing touching the potentiometer.
Please note that the output voltage can be set below 2.5 V at the low end of the potentiometer’s range
and above 8 V at the high end. While this is not likely to damage the regulator, it might not work
reliably or its output could become unstable when the output voltage is not within the recommended
2.5-8 V range. In addition, the potentiometer has no physical end stops, which means that the wiper can
be turned 360 degrees and into an invalid region in which the output voltage is set to approximately 0.5
V.
The output voltage can be up to 3% higher than normal when there is little or no load on the regulator.
The output voltage can also drop depending on the current draw, especially when the regulator is
boosting a lower voltage to a higher one (stepping up), although it should remain within 5% of the set
voltage.
Typical Efficiency and Output Current
The efficiency of a voltage regulator, defined as (Power out)/(Power in), is an important measure of its
performance, especially when battery life or heat are concerns. As shown in the graphs below, this
switching regulator has an efficiency between 80% to 95% for most applications. A power-saving
feature maintains these high efficiencies even when the regulator current is very low.