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46110_large 3 3v step down voltage regulator

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3.3V Step-down Voltage Regulator

These 3.3V step-down voltage regulators generate lower output voltages from input voltages as high as 42V. They are switching regulators or DC-to-DC converters.

Availability: In Stock.

46110 £3.96
(£4.752 incl VAT)

These step-down voltage regulators generate lower output voltages from input voltages as high as 42V. They are switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) and have a typical efficiency between 80% to 90%, which is much more efficient than linear voltage regulators, especially when the difference between the input and output voltage is large.

The regulator has short-circuit protection, and thermal shutdown prevents damage from overheating. The board does not have reverse-voltage protection.


  • Input voltage: [output voltage + dropout voltage] to 42V (see below for more information on dropout voltage).
  • Fixed 3.3V output with 4% accuracy.
  • Maximum output current: 300mA.
  • 1.25MHz switching frequency.
  • 2mA typical no-load quiescent current (20μA typical quiescent current with SHDN = LOW).
  • Integrated over-temperature and over-current shutoff.
  • Small size: 13mm 10mm 3mm.


  • 1 x 3.3V 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:

  • The regulator has four connections: shutdown (SHDN), input voltage (VIN), ground (GND), and output voltage (VOUT).
  • The SHDN pin can be driven low (under 0.3V) to turn off the output and put the board into a low-power state that typically draws 20μA, and it can be driven high (above 2.3V) to enable the board. If you do not need to use the shutdown feature, the SHDN pin can be directly connected to VIN to permanently enable the board. You should not leave this pin disconnected as this can result in unpredictable behavior.
  • The input voltage, VIN, should exceed VOUT by at least the regulators dropout voltage (see below for graphs of dropout voltages as a function of the load), and you must ensure that noise on your input does not exceed the 42V maximum. Additionally, please be wary of destructive LC spikes (see below for more information).
  • The output voltage, VOUT, is fixed at 3.3V.
  • 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 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 41 straight male header strip or the 41 right-angle male header strip that is included.


  • PCB Length: 13mm.
  • PCB Width: 10mm.
  • PCB Height: 3mm.


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UK Deliveries

  • If you live on the UK mainland and don't have any large materials or lithium batteries in your order it will cost 3.95 (4.74 including VAT) if you spend less than 40 (48 including VAT).
  • If you spend between 40 and 200 (48 - 240.00 including VAT, excluding large materials or lithium batteries) delivery is free to most locations, 12 (14.40 including VAT, excluding large materials or lithium batteries) to Northern Ireland and 15 (18.00 including VAT, excluding large materials or lithium batteries) to UK remote locations. For a list of postcodes that will be charged the remote location rate click here.
  • If you spend over 200 (240.00 including VAT, excluding large materials or lithium batteries) delivery is free within the UK.

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Further Information

  • For information about all of the delivery options we offer click here.

Electrical characteristics:

  • Minimum operating voltage: 3.8V.
  • Maximum operating voltage: 42V.
  • Maximum output current: 300mA.
  • Output voltage: 3.3V.
  • Reverse voltage protection?: N.
  • Maximum quiescent current: 2mA.
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