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4693_large 3.3v step up regulator

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3.3V Step-up Voltage Regulator, input 0.5V-5.5V

A 3.3V step-up voltage regulator generates higher output voltages from input voltages as low as 0.5V, making it great for powering 3.3V electronics projects.

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This 3.3V boost (step-up) voltage regulator generates higher output voltages from input voltages as low as 0.5V, and it also automatically switches to a linear down-regulation mode when the input voltage exceeds the output. This makes it great for powering 3.3V electronics projects from 1 to 3 NiMH, NiCd, or alkaline cells or from a single lithium-ion cell.

When boosting, this module acts as a switching regulator (also called switched-mode power supplies (SMPS) or DC-to-DC converters) and has a typical efficiency between 65% to 85%. The available output current is a function of the input voltage, output voltage, and efficiency, but the input current can typically be as high as 1.2A.

The regulators thermal shutdown engages at around 140°C and helps prevent damage from overheating, but it does not have reverse-voltage protection.


  • Input voltage: 0.5V to 5.5V.
  • Fixed 3.3V output with 4% accuracy.
  • Automatic linear down-regulation when the input voltage is greater than the output voltage.
  • 1.2A switch allows for input currents up to 1.2A.
  • Good efficiency at light load: <1mA typical no-load quiescent current, though it can exceed 1mA for very low input voltages.
  • Integrated over-temperature shutoff.
  • Small size: 9 11.5 2.5 mm.


  • 1 x 3.3V Step-up Voltage Regulator.
  • 1 x 3 pin headers of 2.54mm pitch

In Use:

  • The boost regulator has three connections: input voltage (VIN), ground (GND), and output voltage (VOUT).
  • The input voltage, VIN, must be at least 0.5V for the regulator to turn on. However, once the regulator is on, the input voltage can drop as low as 0.3V and the 3.3V output voltage will be maintained on VOUT. Unlike standard boost regulators, this regulator has an additional linear down-regulation mode that allows it to convert input voltages as high as 5.5V down to 3.3V for small to moderate sized loads. When the input voltage exceeds 3.3V, the regulator automatically switches to this down-regulation mode. The input voltage should not exceed 5.5V. Please be wary of destructive LC spikes that might cause the input voltage to surpass 5.5V.
  • The three 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 solderless breadboards, connectors, and other prototyping arrangements that use a 2.54mm grid. You can solder wires directly to the board or solder in either the 31 straight male header strip or the 31 right-angle male header strip that is included.


  • PCB Length: 9mm.
  • PCB Width: 11.5mm.
  • PCB Height: 2.5mm.



Pololu Stock Code:

  • 2563
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