3.3V 1A Step-Up/Down Regulator


Availability: Retired

Out Of Stock

SKU: REG-004 Manufacturer: Pololu Mfg Part Number: 2122



The Pololu step-up/step-down voltage regulator S7V8F3 is a switching regulator (also called a switched-mode power supply (SMPS) or DC-to-DC converter) that uses a buck-boost topology. It takes an input voltage from 2.7 V to 11.8 V and increases or decreases the voltage to a fixed 3.3 V output with a typical efficiency of over 90%. The input voltage can be higher than, lower than, or equal to the set output voltage, and the voltage is regulated to achieve a steady 3.3 V.

This flexibility in input voltage 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 3-cell battery holder, which might have a 4.5 V output with fresh alkalines or a 2.5 V output with partially discharged NiMH cells, can be used with this regulator to power a 3.3 V circuit.
  • A disposable 9 V battery powering a 3.3 V circuit can be discharged to under 3 V instead of cutting out at 4 V, as with typical linear or step-down regulators.
  • In typical applications, this regulator can deliver up to 1 A continuous when the input voltage is higher than 3.3 V (stepping down). When the input voltage is lower than 3.3 V (stepping up), the available current decreases as the difference between the voltages increases


    • Input voltage: 2.7 V to 11.8 V
    • Typical continuous output current: 500 mA to 1 A across most combinations of input and output voltages
    • Small size: 0.45″ × 0.65″ × 0.1″ (11 × 17 × 3 mm)
    • Power-saving feature maintains high efficiency at low currents (quiescent current is less than 0.2 mA)
    • Integrated over-temperature and short-circuit protection
    • Fixed 3.3V output with +5/-3% accuracy


    S7V8F3 Regulator : http://www.pololu.com/product/2122

      Difficulty Level

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

      Product Certifications

      Product Attributes

    Weight: 3 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. 

    More Information:
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