Datasheet

Output voltage settings for the adjustable boost regulators.
The absolute limit for the input voltage is double the output set voltage. For example, if
the output is set to 6 V, the input must not exceed 12 V. Once the input exceeds the
output set point, the output voltage will rise with the input voltage since the input is
connected to the output through an inductor and a diode.
Note: The trimmer potentiometer is not rated for continual adjustment back and forth; the
intended application is to set the output voltage a few times in its life.
Efficiency and available output current
The available output current depends on the input and output voltages. The input current
is limited to approximately 2 A, and, as shown in the graphs below, the efficiency is
typically 80% to 90%. Therefore, the maximum available current will be approximately
800 mA when doubling the input voltage and approximately 400 mA when quadrupling
the input voltage. At high output powers, the 20% lost in the regulator will cause
substantial heating, which can limit the available output power (the regulator will
automatically shut off if its internal temperature gets too high). At low output currents
and high input and output voltages, the efficiency drops closer to 50%, though the lower
power involved prevents heating from being an issue. Some output voltages shown in the
efficiency graphs below can only be achieved using the 4-25V adjustable boost regulator.