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Pololu 24V Step-Up Voltage Regulator U3V50F24
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Pololu 24V Step-Up Voltage Regulator U3V50F24
This powerful boost regulator efficiently generates an output voltage of 24 V from an input voltage as low as 2.9 V while allowing an input current as high as 5 A.
Overview
These boost (step-up) voltage regulators generate higher output voltages from input voltages as low as 2.9 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 95%. 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 5 A. This regulator is available with a fixed 5 V, 6 V, 9 V, 12 V, or 24 V output:
The U3V50x regulator family also includes two adjustable-output versions: the U3V50ALV offers an output range of 4 V to 12 V and the U3V50AHV offers an output range of 9 V to 30 V. The different versions of the board all look very similar, so the bottom silkscreen includes a blank space where you can add your own distinguishing marks or labels.
The no-load quiescent current depends on the difference between the input and the output voltage. When the two are close, the quiescent current can be less then a milliamp (e.g. 0.6 mA with 5 V in and 6 V out); when the two are far apart, it might be in the tens of milliamps (e.g. 24 mA with 3 V in and 24 V out).
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
- Fixed 5 V, 6 V, 9 V, 12 V or 24 V output with 4% accuracy
- 5 A switch allows for input currents up to 5 A
- 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
- 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
The 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 ENABLE pin can be driven low (under 0.7 V for at least 1 ms) to put the board into a low-power state. The quiescent current draw in this sleep mode is dominated by the current in the 100kO pull-up resistor from ENABLE to VIN and by the reverse-voltage protection circuit, which will draw approximately 20 µA per volt on VIN when ENABLE is held low. The ENABLE pin can be driven high (above 1.3 V to enable the board, or it can be connected to VIN or left disconnected if you want to leave the board permanently enabled. 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.
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The connections are labeled on the back side of the PCB, and the board offers several options for making electrical connections. The eight smaller through-holes on the ends of the board are arranged with a 0.1" spacing for compatibility with solderless breadboards, connectors, and other prototyping arrangements that use a 0.1" grid; you can solder pieces of the included 9A—1 straight male header strip into these smaller holes. Alternatively, you can solder the included 2-pin 5mm-pitch terminal blocks to the two pairs of larger holes on the ends of the board. For the most compact installation, you can solder wires directly to the board.
Note that this regulator has a thick PCB (0.093"), so terminal block and header pins will not protrude as far through the holes as they would with typical 0.062"-thick PCBs.
Pololu step-up voltage regulator U3V50x with included terminal blocks installed, side view. |
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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, this switching regulator typically has an efficiency of 80 to 95%.
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.
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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