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46113_large 5v step up step down voltage regulator

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5V Step-up/Step-down Voltage Regulator, input 2.5V-18V

This 5V step-up/step-down voltage regulator takes an input voltage from 2.5V to 18V and increases or decreases the voltage to a fixed 5V output.

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This step-up/step-down voltage regulator S10V4F5 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. It takes an input voltage from 2.5V to 18V and increases or decreases the voltage to a fixed 5V output with a typical efficiency of 70% to 80%.

This flexibility in input voltage is especially well-suited for battery-powered applications in which the battery voltage begins above 5V and drops below as the battery discharges. Since it lacks the typical restriction that the battery voltage stay above the required voltage throughout its life, new battery packs and form factors can be considered. For instance, a 4-cell battery holder, which might have a 6V output with fresh alkalines but a 4.8V nominal voltage with NiMH cells and a 4V output with partially discharged cells, can now be used for a 5V circuit. In another typical scenario, a disposable 9V battery powering a 5V circuit can be discharged to under 3V instead of cutting out at 6V, as with typical linear or step-down regulators.

In typical applications, this regulator can deliver over 400mA continuous. The regulators thermal shutdown prevents damage from overheating, but it does not have short-circuit or reverse-voltage protection.


  • Input voltage: 2.5V to 18V (can be higher than, the same as, or lower than the 5V output).
  • Fixed 5V output with 4% accuracy.
  • Typical continuous output current: 400mA (actual continuous output current depends on input voltage).
  • >2mA typical no-load quiescent current.
  • Integrated over-temperature shutoff.
  • Small size: 10mm 15mm 3mm.


  • 1 x 5V Step-up/Step-down Voltage Regulator.
  • 1 x 4 pin headers of 2.54mm pitch - Straight.
  • 1 x 4 pin headers of 2.54mm pitch - right angled.

In Use:

  • This step-up/step-down regulator has four connections: shutdown (SHDN), input voltage (VIN), ground (GND), and output voltage (VOUT).
  • The SHDN pin can be driven low (under 0.4V) to power down the regulator. The quiescent current in this shutdown mode is dominated by the current in the 10kΩ pull-up resistor from SHDN to VIN. With SHDN held low, this resistor will draw 0.1mA per volt on VIN (for example, the shutdown current with a 5V input will be 0.5mA). This pin should only ever be driven low or left floating; this can be accomplished with a physical switch that toggles it between ground and disconnected, or electrically with something like a transistor controlled by an I/O line.
  • The input voltage should be between 2.5V and 18V. Lower inputs can shut down the voltage regulator; higher inputs can destroy the regulator, so you should ensure that noise on your input is not excessive and be wary of destructive LC spikes.
  • The four connections are labeled on the back side of the PCB, and they are arranged with a 2.54mm spacing along the edge of the board for compatibility with standard solderless breadboards and perfboards and connectors that use a 2.54mm grid. You can solder wires directly to the board or solder in either the 41 straight male header strip or the 41 right-angle male header strip that is included.


  • PCB Length: 10mm.
  • PCB Width: 15mm.
  • PCB Height: 3mm.


Pololu Stock Code:

  • 2121
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