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New D24V150Fx 15A step-down voltage regulator family — our highest-power regulators yet!

Posted by Claire on 1 November 2016
Tags: new products

I am excited to announce that we just released our highest power regulators ever. The new D24V150Fx family of step-down regulators includes units with 3.3 V, 5 V, 6 V, 7.5 V, 9 V, and 12 V outputs and can output currents of around 15 A! With all of the output voltages available, the D24V150Fx family of regulators is great for a variety power-hungry projects like running servos or our metal gearmotors and supplying large LED displays.

Pololu Step-Down Voltage Regulator D24V150Fx in a breadboard, assembled with terminal blocks and male headers.

Pololu Step-Down Voltage Regulator D24V150Fx, bottom view with dimensions.

The maximum continuous output currents for all the members of the D24V150Fx family are shown in the graph below. You can see that the available output current is generally a little higher for the lower-voltage versions than it is for the higher-voltage versions, and it decreases as the input voltage increases.

These regulators accept input voltages up to 40 V and have typical efficiencies between 80% and 95%. Integrated reverse-voltage protection, over-current protection, over-temperature shutoff, undervoltage lockout, and soft-start features make these regulators robust, and a power good output can be used to monitor the output voltage.

See the product pages for any of the D24V150Fx regulators for more information on these new regulators, or visit our voltage regulator category to see all of our regulator options.


Hi Claire,

what about voltage ripple on this unit?

We do not have that characterized, and I do not have a setup to test it well, but I put a 6 V unit on my scope with 24 V in, and I'm seeing around 35 mV peak to peak across a wide range of loads.


I would like to know what are the operating temperatures of the 5V 15A regulator, and what is the threshold before thermal shutdown occurs?

We do not have the available output current vs. ambient temperature characterized (the available current depends on several factors). In general, the regulator is limited by heat dissipation, and the higher your ambient temperature, the less current will be available. The maximum continuous current graph on the product page is for the hottest part of the board getting to 125°C; the thermal shutdown is around 160°C, inside the regulator IC.

Can I add a heatsink to this circuit to help dissipate heat? Where do you recommend I do that? On the power transistor on the top side?

We have not characterized these regulators with heatsinks, but you could try adding one to see how much improvement you would get. It would probably be most effective on the silkscreen side of the board above the two large FETs. Additionally, we have generally found forced airflow to be more effective than a heatsink alone. For fun one of our engineers designed a fan enclosure for these regulators and in some brief tests was able to get several extra amps out. If you have access to a 3D printer and want to try it out, you can download it from Thingiverse. If you do try that enclosure or heatsinking, we would be interested to hear how it goes.


It shows in all of the images that there are multiple GND's. Are all the GND's connected or is the GND next to the Vin different than the GND next to the Vout?


Yes, all the grounds on those boards are tied together.

I would like to mount these regulators perpendicular to my pcb.

Do you have right angle headers with pins long enough for the +VOUT and GND holes?

We do not carry right-angle male header pins in that size, and I do not have a specific suggestion for a supplier.

Please note, our header pins can only handle about 3A per pin, so if you are running more than 6A for your setup, it would be better to do something like use the supplied terminal blocks or solder wires directly to the board.

Is it ok to use only one ground wire? In other words, is the trace width on the regulator pcb sufficient to carry input + output ground current?

Or, is it necessary to use both ground wire connections?

The DC current through the ground connection is relatively low; however, if you do not connect both grounds, it negatively affects the AC aspect of the regulator switching and increases both electrical noise at the load and radiated emissions throughout the circuit, so we do not recommend having a single ground connection.

hello Claire
cant you company make this cooling fan system fore the units and selling it as a complite kit
Hi, Magnus.

Things like the available space, direction of airflow, and amount of airflow you need are going to be very specific to the overall system, so I do not expect to offer a regulator like this with a particular fan as a general stock product. Can you share more about your application and what kind of a fan setup would be good for you?

- Jan
Can you explain the soft-start circuit? I would like to use this in a tube amplifier to 1) provide a stabilized filament voltage and 2) limit inrush current when the filament is switched on. The 6volt/10A filament will pull 30A at turn-on until it heats up. Will the softstart limit this inrush? What's the time constant on it? Is there anyway to program it?
Hi, John.

The soft-start circuit uses a capacitor to time how quickly to let the output voltage rise during startup. If you email us, I can send you a picture that shows where the soft-start capacitor is on the board.

Which parts of the regulator would benefit from applying heatsinks? Just the 10 capacitors? I've got a pack of 10 ENZOTECH MOS-C1 heatsinks laying around and hope these might do the job (8A continuously)

Can you give some advice, thanks.
Hi, Rob.

We have not characterized these regulators with heatsinks, but you could try adding one to see how much improvement you would get. It would probably be most effective on the silkscreen side of the board above the two large FETs. We have also generally found that forced airflow is more effective than a heatsink alone and one of my previous posts has a link to a 3D printable enclosure that fits a fan. Note that for most input and output voltage combinations 8A should not be an issue without additional cooling.

I had used these regulators with 12V inputs before and even though they get hot, they worked fine. I recently used the 5V output in a nominal 24V system (a fully charged battery was about 28V). Even without any load, the regulator got very hot and after about 2 hours, it started producing smoke and the current consumption rose to about 0.5A on the input, with the output getting much higher than 5V. All of this indoors, at a laboratory, so the ambient temperature was about 78F and the unit is mounted on a PCB in the open. Since then, I have installed 5mm heatsinks and plan on adding a tiny fan on top of them, however, I wonder how much testing have you done with these units near their maximum input voltage?
Hello, Yiannis.

We have tested these regulators at their maximum input voltage, but to the best of my knowledge we have not observed ourselves or heard of anyone else observing behavior like what you described, so there might have been a problem with your setup or that particular regulator. The comments for this blog post are not a good setting for troubleshooting discussions, so please email us, and we would be happy to help figure out what might have gone wrong. In your email, I recommend including a reference to your comment here, your order information, and some pictures of your board and setup.

- Patrick

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