pretvarač napona step up 2.9-30V>9-30V, 5A, Pololu 2571
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These adjustable 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 the Typical Efficiency and Output Current section below), but the input current can typically be as high as 5 A.
The U3V50x regulator family 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.
Versions of this regulator are also available with a fixed 5 V, 6 V, 9 V, 12 V, or 24 V output:
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).
Input voltage: 2.9 V to VOUT
Output adjustable from 4 V to 12 V or 9 V to 30 V
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 for #2 or M2 screws
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 kOhm 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.