Datasheet

• 550 kHz switching frequency
• 2 mA typical no-load quiescent current (20 μA typical quiescent current with SHDN = LOW)
• Integrated over-temperature and over-current shutoff
• Small size: 0.5″ × 0.4″ × 0.1″ (13 mm × 10 mm × 3 mm)
Using the Regulator
Connections
The buck regulator has four connections: shutdown (SHDN), input voltage (VIN), ground (GND), and
output voltage (VOUT).
The SHDN pin can be driven low (under 0.3 V) to turn off the output and put the board into a low-
power state that typically draws 20 μA. The SHDN pin can be driven high (above 2.3 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 exceed VOUT by at least the regulator’s dropout voltage (see below for
graphs of dropout voltages as a function of the load), and you must ensure that noise on your input does
not exceed the 42 V maximum. Additionally, please be wary of destructive LC spikes (see below for
more information).
The output voltage, VOUT, is fixed and depends on the regulator version: the D24VxF3 version
outputs 3.3 V, the D24VxF5 version outputs 5 V, the D24VxF9 version outputs 9 V, and the D24VxF12
version outputs 12 V.
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 solderless breadboards, connectors, and
other prototyping arrangements that use a 0.1″ grid. You can solder wires directly to the board or solder