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Description
Pololu Adjustable 4-12V Step-Up-Step-Down Voltage Regulator S18VPololu item #: 2572 This powerful step up step down regulator efficiently produces an adjustable 4 V to 12 V output from input voltages between 3 V and 30 V while allowing a typical output current of up to 2 A when the input voltage is close to the output voltage and offering typical efficiencies of 80% to 90%. Its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly,
Pololu item #: 2572
These step-up/step-down regulators take an input voltage from 3 V to 30 V and increase or decrease it as necessary to produce an adjustable 4 V to 12 V or 9 to 30 V output, depending on the version. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) with a single-ended primary-inductor converter (SEPIC) topology, and they have a typical efficiency between 80% and 90%. The available output current is a function of the input voltage, output voltage, and efficiency (see the Typical Efficiency and Output Current section below), but it will be around 2 A when the input voltage is close to the output voltage.
The S18V20x regulator family consists of the two adjustable-output versions mentioned above along with four versions that output a fixed 5 V, 6 V, 9 V, or 12 V. The different versions of the board all look very similar, so the bottom silkscreen includes a blank space where you can add your own distinguishing marks or labels. This product page applies to both adjustable-output versions of the S18V20x family.
The flexibility in input voltage offered by these regulators is especially well-suited for battery-powered applications in which the battery voltage begins above the desired output voltage and drops below the target as the battery discharges. Without the typical restriction on the battery voltage staying above the required voltage throughout its life, new battery packs and form factors can be considered. For example:
A 4-cell battery holder, which might have a 6 V output with fresh alkalines or a 4.0 V output with partially discharged NiMH cells, can be used with the 5V version of this regulator to power a 5 V circuit.
A disposable 9 V battery powering a 5V circuit can be discharged to under 3 V instead of cutting out at 6 V, as with typical linear or step-down regulators.
The 6V version of this regulator can be used to enable a wide range of power supply options for a hobby servo project.
The no-load quiescent will typically be between 1 mA and 5 mA for most combinations of input and output voltages, though the combination of a very high output voltage and a very low input voltage (e.g. when boosting from 3 V in to 24 V out) can result in quiescent currents on the order of a few dozen milliamps.
The ENABLE pin can be used to put the board in a low-power state that reduces the quiescent current to between 10 and 20 µA per volt on VIN (e.g. approximately 30 µA with 3 V in and 500 µA with 30 V in).
This regulator has built-in reverse-voltage protection, over-current protection, thermal shutdown (which typically activates at 165°C), and an under-voltage lockout that causes the regulator to turn off when the input voltage is below 2.5 V (typical).
For similarly powerful boost-only regulators, consider our U3V50x regulator family, which are typically more appropriate if you know that your input voltage will always be lower than your output voltage.
Features
- Input voltage: 2.9 V to 32 V1
- Output adjustable from 4 V to 12 V or 9 V to 30 V
- Typical maximum continuous output current: 2 A (when input voltage is close to the output voltage; the Typical Efficiency and Output Current section below shows how the achievable continuous output current depends on input and output voltages)
- Integrated reverse-voltage protection (up to 30 V), over-current protection, over-temperature shutoff, and under-voltage lockout
- Typical efficiency of 80% to 90%, depending on input voltage, output voltage, and load
- Four mounting holes for #2 or M2 screws
- Compact size: 1.7″ × 0.825″ × 0.38″ (43 × 21 × 10 mm)
- Smaller holes for 0.1″ header pins and larger holes for terminal blocks offer several options for connecting to the board
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4.3 ★★★★★
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Product Reviews
★★★★★ 5
Great product!
Size: 4-tier, Style: wall mount&floor mount, Size: 4-tier, Style: wall mount&floor mount
This is my second time purchasing these shelves. They are easy to set up, come with all the screws, brackets, and drywall anchors (if needed). I definitely love the quality, look and versatility. Being that my ceiling is slanted I couldn’t mount them from there but easily mount them to the surface beneath the shelving. My husband loved my idea and how they turned out! Highly recommend!
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Reviewed in the United States on August 8, 2024
★★★★★ 4
No Instructions - Easy to build and study
Size: 4-tier, Style: wall mount&floor mount
I ordered 3, and my wife loves the look of them. They seem to support a decent amount of weight. I supervised my 7 year old (55 lbs) as she scaled a single shelf bracket up the wall after it was mounted, without the planks.
You do need to have some amount of handiness to be looking at buying as it does not come assembled, and does not have the wood planks with it.
A little learning curve I had. Keep the rods only hand snug, not tight, snug, and then as you put it up to the wall adjust as needed to get the heights and widths right to the opposing shelf.
There is also only 8 pipe brackets to hold the shelves down (2 per shelf) and I did not realize this at first and assumed I had 16 (4 per shelf). I had to go back and fix.
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Reviewed in the United States on January 5, 2021
★★★★★ 5
Game changing storage!
Size: 4-tier, Style: wall mount&floor mount
I love the shelves. I got to use my own wood which was a reclaimed piece that I found and sanded and then stained. I'm so proud to see them on the shelves. It got so much clutter corralled from around the room and put in one place where it all looks good displayed together. The support pieces are very good quality and I found this to be very good value for the price. I'm very happy with this item.
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Reviewed in the United States on February 25, 2024
★★★★★ 5
Good all around, some imperfections on threads difficult to screw together
Size: 4-tier, Style: wall mount&floor mount
I received a complete product as advertised, it's a solid steel design with everything you need to mounted included. One small issue I encountered is that the pieces screw together but they wouldn't screw all the way it felt difficult and possibly if forced the steel might crack. Unfairly enough other pieces did completely screw in. So it's probably because of imperfections on the threads.
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Reviewed in the United States on May 9, 2021
★★★★★ 5
Build w/ a Friend, and BYOL (Bring Your Own Level)
Size: 4-tier, Style: wall mount&floor mount
Definitely a two-person job. Not because it's heavy, but a little awkward at first. I installed the first bracket, and my 12 yo assisted. Then, she hung the second bracket, and I assisted. Have a level handy. I didn't want to roll the dice and allow her to hang from the bracket, but it seems super-strong. We hung the brackets 32" apart, and 6" overhang, i.e. 48" x 12" laminate shelves. Gorgeous.
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Reviewed in the United States on March 12, 2025