Adjustable 4V-12V Step-Up Voltage Regulator U3V50ALV

This powerful boost regulator efficiently boosts input voltages as low as 2.9 V to a higher, adjustable output voltage between 4 V and 12 V while allowing an input current as high as 5 A.

This adjustable boost (step-up) voltage regulator generates higher output voltages from input voltages as low as 2.9 V. These switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) and have a typical efficiency between 80% to 95%. The available output current is a function of the input voltage, output voltage, and efficiency (see the Typical Efficiency and Output Current section below), but the input current can typically be as high as 5 A.

The ENABLE pin can be used to put the board in a low-power state that reduces the quiescent current to approximately 20 µA per volt on VIN.

This regulator has built-in reverse-voltage protection, over-current protection, thermal shutdown (which typically activates at 165°C), and an under-voltage lockout that causes the regulator to turn off when the input voltage is below 2.5 V (typical).

Features

  • Input voltage: 2.9 V to VOUT
  • Output adjustable from 4V up to 12V
  • 5A switch allows for input currents up to 5A
  • Integrated reverse-voltage protection, over-current protection, over-temperature shutoff, and under-voltage lockout
  • Typical efficiency of 80% to 95%, depending on input voltage, output voltage, and load
  • Compact size: 1.9″ × 0.6″ × 0.41″ (48 × 15 × 10.5 mm)
  • Two mounting holes for #2 or M2 screws
  • Smaller holes for 0.1″ header pins and larger holes for terminal blocks offer several options for connecting to the board

Using the Regulator

Connections

This boost regulator has four connections: input voltage (VIN), ground (GND), and output voltage (VOUT), and ENABLE.

The input voltage, VIN, must be at least 2.9 V and should not exceed the output voltage, VOUT. (If VIN is higher than VOUT, the higher input voltage will show up on the output, which is potentially dangerous for your connected load and could also damage the regulator.)

The regulator is enabled by default: a 100 kΩ pull-up resistor on the board connects the ENABLE pin to reverse-protected VIN. The ENABLE pin can be driven low (under 0.7 V) to put the board into a low-power state. The quiescent current draw in this sleep mode is dominated by the current in the pull-up resistor from ENABLE to VIN and by the reverse-voltage protection circuit, which will draw between 10 µA and 20 µA per volt on VIN when ENABLE is held low. If you do not need this feature, you should leave the ENABLE pin disconnected. Note that like most boost regulators, the input power will pass through to the output when the board is disabled, so the ENABLE pin cannot be used to turn off power to the load.

The board has two mounting holes intended for #2 or M2 screws. The mounting holes are at opposite corners of the board, separated by 1.7″ horizontally and 0.4″ vertically.

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 below, these switching regulators have an efficiency of 80% to 95% for most combinations of input voltage, output voltage, and load.

Voltage Regulator Efficiency

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 5 A switch current limit, 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.

Setting the output voltage

The output voltage can be adjusted using a multimeter and a light load (e.g. a 10 kΩ to 100 kΩ resistor). Turning the potentiometer clockwise increases the output voltage. The output voltage can be affected by a screwdriver touching the potentiometer, so the output measurement should be done with nothing touching the potentiometer (also, note that touching parts of the board with your finger can affect the output voltage).

NOTE: During normal operation, this product can get hot enough to burn you. Take care when handling this product or other components connected to it.

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Adjustable 4V-12V Step-Up Voltage Regulator U3V50ALV

  • Manufacturer: Pololu
  • Product Code: U3V50ALV
  • Availability:  20
  • £11.40

  • Ex Tax: £9.50

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Tags: adjustable, 4V, 12V, Step-Up, Voltage, Regulator, U3V50ALV, 5a, stepup, switch, mode, 2570, Pololu