The output voltage can be set using the trimmer potentiometer in the upper-right corner of the board. The input voltage range is 1.5 V to 16 V (the input voltage should be kept below the output voltage). The integrated 2 A switch allows for output currents high enough to drive small motors, as in the 3pi robot, and allows large voltage gains, such as obtaining 24 V from two NiMH cells.
Some example applications include:
- Powering 5 V systems from lower-voltage batteries.
- Powering 5 V subsystems (e.g. sensors) in lower-voltage (e.g. 3.3 V) systems.
- Achieving consistent actuator operation when powered by fluctuating batteries
- Powering high-brightness LEDs or a large number of LEDs in series
Using the Boost Regulator
The boost regulator has just three connections: the input voltage, ground, and the output voltage. These three connections are labeled on the back side of the PCB, and they are arranged with a 0.1" spacing along the edge of the board for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1" grid. You can solder wires directly to the board or solder in either the 3×1 straight male header strip or the 3×1 right-angle male header strip that is included.
- Input voltage: 1.5 V to 16 V
- Output adjustable from 4V to 25V
- 750 kHz switching frequency
- 2 A switch (and input) limit
- integrated over-temperature and over-current shutoff
- typical efficiency of 80-90% when doubling voltage and with 100-500 mA output
- Small size: 10.7 x 22.4 x 5.8 mm (0.42″ x 0.88″ x 0.23″)
- Weight without header pins: 1.6 g (0.06 oz)
Warning: You should be careful not to use an input voltage that exceeds the output voltage setting,
so we recommend setting the output voltage with the input voltage around or below 2.5 V (e.g. using one or two alkaline batteries). Note that 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 2.5 V (for both the 2.5 V to 9.5 V
and 4 V to 25 V versions).
- Minimum operating voltage: 1.5V
- Maximum operating voltage: 16V (Absolute max. The operating voltage should not exceed the set output voltage, VOUT.)
- Minimum output voltage: 4V
- Maximum output voltage: 25V
- Reverse voltage protection: No
- Maximum quiescent current: 30mA (With no load. Actual quiescent current ranges from 2 to 30 mA depending on input voltage and output voltages.)