Testimonials Testimonials

Pololu Step-Up 5V 600mA Voltage Regulator U3V12F5

Pololu Step-Up 5V 600mA Voltage Regulator U3V12F5

£3.43 incl VAT
(£2.86 exc. tax)
Price in points: 572 points
1.00 g.
In stock
Add to wish list

The compact (0.32"×0.515") U3V12F5 switching step-up (or boost) voltage regulator takes an input voltage as low as 2.5 V and efficiently boosts it to 5V. The pins have a 0.1" spacing, making this board compatible with standard solderless breadboards and perfboards.


This boost (step-up) voltage regulator generates a higher output voltages from input voltages as low as 2.5 V. 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%. The available output current is a function of the input voltage, output voltage, and efficiency (see Typical Efficiency and Output Current section below), but the input current can typically be as high as 1.4 A. This regulator is available with a fixed 5V, we also stock 9V, and 12V output versions.

The regulator’s thermal shutdown prevents damage from overheating, but it does not have short-circuit or reverse-voltage protection.


  • input voltage: 2.5 V – VOUT
  • fixed 5V output with 4% accuracy
  • 1.4 A switch allows for input currents up to 1.4A
  • 2mA typical no-load quiescent current
  • integrated over-temperature shutoff
  • small size: 0.515" × 0.32" × 0.1" (13 × 8 × 3 mm)

Using the Regulator


The boost regulator has three connections: input voltage (VIN), ground (GND), and output voltage (VOUT).

The input voltage, VIN, must be at least 2.5 V and should not exceed the output voltage, VOUT. Please be wary of destructive LC spikes that might cause the input voltage to exceed VOUT (see below for more information).

The three connections are labeled on the back side of the PCB, and they are arranged with a 0.1" spacing along the edge of the board for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1" grid. You can solder wires directly to the board or solder in either the 3×1 straight male header strip or the 3×1 right-angle male header strip that is included.

Typical Efficiency and Output Current

The efficiency of a voltage regulator, defined as (Power out)/(Power in), is an important measure of its performance, especially when battery life or heat are concerns. As shown in the graphs above, this switching regulator typically has an efficiency of 80 to 90%.

The maximum achievable output current is approximately proportional to the ratio of the input voltage to the output voltage. If the input current exceeds the switch current limit (typically somewhere between 1.4 and 2A), the output voltage will begin to drop. Additionally, the maximum output current can depend on other factors, including the ambient temperature, air flow, and heat sinking.

LC Voltage Spikes

When connecting voltage to electronic circuits, the initial rush of current can cause damaging voltage spikes that are much higher than the input voltage. In our tests with typical power leads (~30" test clips), input voltages above 10V caused voltage spikes in excess of 20 V. You can suppress such spikes by soldering a 33μF or larger electrolytic capacitor close to the regulator between VIN and GND.

More information about LC spikes can be found in our application note, Understanding Destructive LC Voltage Spikes.


Size: 0.32″ × 0.515″ × 0.1″1
Weight: 0.4 g1

General specifications

Minimum operating voltage: 2.5V
Maximum operating voltage: 5V
Maximum input current: 1.4 A2
Output voltage: 5V
Reverse voltage protection?: N
Maximum quiescent current: 2mA


1 Without included optional headers.
2 Regulator may overheat at lower input currents when VIN is much lower than VOUT. Available output current is a function of VIN, VOUT, and the regulator efficiency.

Manufacturer's Details

Manufacturer's SKU :

No posts found

Write a review

No FAQ found

£3.43 incl VAT (£2.86 exc. tax)
The compact (0.32"×0.515") U3V12F9 switching step-up (or boost) voltage regulator takes an input voltage as low as 2.5V and efficiently boosts it to... read more
In stock
Price in points: 572 points

£3.43 incl VAT (£2.86 exc. tax)
The compact (0.32"×0.515") U3V12F12 switching step-up (or boost) voltage regulator takes an input voltage as low as 2.5V and efficiently boosts it to... read more
In stock
Price in points: 572 points

Customers also bought....

£0.32 incl VAT (£0.27 exc. tax)
DC Power Plug size 1.7mm with cable strain relief Overall diameter: 4mm Internal diameter: 1.7mm Shank Length: 10mm read more
In stock
Price in points: 54 points

£0.31 incl VAT (£0.26 exc. tax)
This PCB mounting DC power socket have been manufactured in PBT and will suit 2.1mm DC power plugs.   PCB mounting May be hand wired... read more
In stock
Price in points: 52 points

£0.23 incl VAT (£0.19 exc. tax)
A 5-pin PCB mounting 3.5mm stereo jack socket with both signal poles switched. read more
In stock
Price in points: 38 points

£1.87 incl VAT (£1.56 exc. tax)
Electro Mechanical Sounder, Continuous Tone, 12mm Diameter, Built-in oscillating circuit, Sealed structure, Wave solderable and washable, Noryl Housing.... read more
In stock
Price in points: 312 points

£2.16 £2.08 incl VAT (£1.73 exc. tax)
Mini needle-nose pliers with hardened and tempered carbon steel jaws for more accurate and delicate work. 2-tone, soft-grip handles with return springs for... read more
Currently Unavailable
Discontinued Product
Price in points: 346 points