Datasheet

Connections
The step-up/step-down regulator has four connections: shutdown (SHDN), input voltage (VIN), ground
(GND), and output voltage (VOUT).
The SHDN pin can be driven low (under 0.4 V) to power down the regulator and put it in a low-power
state. The quiescent current in this sleep mode is dominated by the current in the 100k pull-up resistor
from SHDN to VIN. With SHDN held low, this resistor will draw 10 µA per volt on VIN (for example,
the sleep current with a 5 V input will be 50 µA). The SHDN pin can be driven high (above 1.2 V) to
enable the board, or it can be connected to VIN or left disconnected if you want to leave the board
permanently enabled.
The input voltage, VIN, should be between 2.7 V and 11.8 V. Lower inputs can shut down the voltage
regulator; higher inputs can destroy the regulator, so you should ensure that noise on your input is not
excessive, and you should be wary of destructive LC spikes (see below for more information).
The output voltage, VOUT, is determined by the trimmer potentiometer position. See the Setting the
Output Voltage section below for details.
The four 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 standard solderless breadboards and
perfboards and connectors that use a 0.1″ grid. You can solder wires directly to the board or solder in
either the 4×1 straight male header strip or the 4×1 right-angle male header strip that is included.