5V 2A Step-Up/Down Regulator


Availability: Retired

Out Of Stock

SKU: REG-002 Manufacturer: Pololu Mfg Part Number: 2574



This step-up/step-down regulator takes an input voltage from 3 V to 30 V and increase or decrease it as necessary to produce a fixed 5 V output. This is a switching regulator (also called a switched-mode power supply (SMPS) or DC-to-DC converter) with a single-ended primary-inductor converter (SEPIC) topology, and a typical efficiency between 80% and 90%. The available output current is a function of the input voltage, output voltage, and efficiency and will be around 2 A when the input voltage is close to the output voltage.

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 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.
  • 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).


    • Input voltage: 2.9 V to 32 V
    • Typical maximum continuous output current: 2 A when input voltage is close to the output voltage
    • Typical efficiency of 80% to 90%
    • Compact size: 1.7″ × 0.825″ × 0.38″ (43 × 21 × 10 mm)
    • Fixed 5V output with 4% accuracy
    • Integrated reverse-voltage protection (up to 30 V), over-current protection, over-temperature shutoff, and under-voltage lockout
    • Four 0.086″ mounting holes for #2 or M2 screws
    • Smaller holes for 0.1″ header pins and larger holes for terminal blocks


    S18V20F5: http://www.pololu.com/product/2574

      Difficulty Level

    Soldering Skill: Beginner
    Prototyping Skill: Beginner
    Programming Skill: N/A

      Product Certifications

      Product Attributes

    Weight: 13 g

      Warranty Policy

    This product has a 30 Day Warranty from the date of delivery. The item must not be modified, abused, incorrectly hooked up, or used for purposes outside the original scope of design.

      Return Policy

    This product is Final Sale and cannot be returned once purchased. 

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