Pololu 12V, 600mA Step-Down Voltage Regulator

This micro sized step-down voltage regulator is perfect for supplying 12V power (from a higher voltage source like 4S or 5S LiPo) to your FPV gear that needs specifically 12V range.  Power 12V flight cameras, LED lights or other gear that can only run on 12V.

The compact (13×10×3 mm) D24V6F12 synchronous buck voltage regulator takes an input voltage of up to 42 V and efficiently reduces it to 12 V while allowing for a maximum output current of 600 mA. This regulator offers typical efficiencies between 80% and 90% and has a very low dropout, so it can be used with input voltages as low as a few hundred millivolts above 12 V. The pins have a 2.5mm spacing, making this board compatible with standard solderless breadboards and perfboards.

Features

• Fixed 12 V output with 4% accuracy
• Typical efficiency of 80% to 90%
• 1.25 MHz switching frequency
• 2 ms soft-start reduces in-rush current on power-up
• 2 mA typical no-load quiescent current
• Integrated over-temperature and over-current shutoff
• Small size

Specifications

• Dimensions: 13 mm × 10 mm × 3 mm
• Weight: 0.5 g (Without included optional headers)
• Minimum operating voltage: 14 V (For small loads; input voltage must be at least 15 V to get the full 600 output)
• Maximum operating voltage: 42 V
• Maximum output current: 600 mA
• Output voltage: 12 V
• Maximum quiescent current: 2 mA (While enabled [SHDN = HIGH] with no load; Current draw is approximately 20 µA when SHDN = LOW)

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, and it can be driven high (above 2.3 V) to enable the board. If you do not need to use the shutdown feature, the SHDN pin can be directly connected to VIN to permanently enable the board. You should not leave this pin disconnected as this can result in unpredictable behavior. 

The input voltage, VIN, should exceed VOUT by at least the regulator’s dropout voltage (see 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 D24V6F12 version outputs 12 V.

The four connections are labeled on the back side of the PCB and are arranged with a 2.5 mm spacing along the edge of the board for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 2.5 mm grid. You can solder wires directly to the board or solder in either the 5×1 straight male header strip or the 5×1 right-angle male header strip that is included.

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. This family of switching regulators typically has an efficiency of 80% to 90%. (See graphs in pictures)

Typical dropout voltage

The dropout voltage of a step-down regulator is the minimum amount by which the input voltage must exceed the regulator’s target output voltage in order to ensure the target output can be achieved. For example, if a 5 V regulator has a 1 V dropout voltage, the input must be at least 6 V to ensure the output is the full 5 V. Generally speaking, the dropout voltage increases as the output current increases.

LC voltage spikes

When connecting voltage to electronic circuits, the initial rush of current can cause voltage spikes that are much higher than the input voltage. If these spikes exceed the regulator’s maximum voltage (42 V), the regulator can be destroyed. In our tests with typical power leads (~30″ test clips), input voltages above 20 V caused spikes over 42 V.

If you are connecting more than 20 V or your power leads or supply has high inductance, it's recommended to solder a 33 μF or larger electrolytic capacitor close to the regulator between VIN and GND. The capacitor should be rated for at least 50 V.

Shipping Contents

• 1 x Pololu 12V, 600mA Step-Down Voltage Regulator (D24V6F12)
• 1 x Straight male header strip (5x1)
• 1 x Right-angle male header strip (5x1)