Data Sheet

ManualsBrandsPololu Manuals9.0 V DC Regulators2.5-9V Fine-Adjust Step-Up/Step-Down Voltage Regulator S9V11MA

2/8/2018 Pololu - 2.5-9V Fine-Adjust Step-Up/Step-Down Voltage Regulator S9V11MA

https://www.pololu.com/product/2869 1/6

Connections

The step-up/step-down regulator has five main connections all located along the same edge of the

board: the output voltage (OUT), ground (GND), the input voltage (IN), an enable input (EN), and a

power good indicator (PG). The board also contains a through-hole labeled SEL that is not used on

this version of the regulator.

The output voltage, VOUT, is determined by the trimmer potentiometer position. See the Setting the

output voltage section below for details.

The input voltage, VIN, should be between 3 V and 16 V when the regulator is first powered. After it is

running, it can continue operating down to 2 V. Lower inputs can shut down the voltage

regulator; higher inputs can destroy the regulator, so you should ensure that noise on your input is not

excessive, and you should be wary of destructive LC spikes (see below for more information).

The regulator, which is enabled by default, can be put into a low-power sleep state by reducing the

voltage on the EN below 0.7 V, and it can be brought out of this state again by increasing the voltage

on EN past 0.8 V. The quiescent current draw in this sleep mode is dominated by the current in the

100 kΩ pull-up resistor from ENABLE to VIN, which is approximately 7 µA per volt on VIN (e.g.

approximately 20 µA with 3 V in). The tight tolerance of the enable input allows a precise low-VIN

cutoff to be set, such as with the output of an external voltage divider powered by VIN, which is useful

for battery powered applications where draining the battery below a particular voltage threshold could

permanently damage it.

The “power good” indicator, PG, is an open-drain output that goes low when the regulator’s output

falls below around 90% of the nominal voltage, including when the enable pin is held low. The power

good indicator is held low until the output reaches 95% of the nominal voltage when it is powering up

or coming out of low-power mode. Otherwise, the PG pin is high-impedance, so an external pull-up

resistor is required to use this pin.

Included hardware

Summary of content (6 pages)

PAGE 1
2/8/2018 Pololu - 2.5-9V Fine-Adjust Step-Up/Step-Down Voltage Regulator S9V11MA Connections The step-up/step-down regulator has five main connections all located along the same edge of the board: the output voltage (OUT), ground (GND), the input voltage (IN), an enable input (EN), and a power good indicator (PG). The board also contains a through-hole labeled SEL that is not used on this version of the regulator. The output voltage, VOUT, is determined by the trimmer potentiometer position.
PAGE 2
/8/2018 Pololu - 2.5-9V Fine-Adjust Step-Up/Step-Down Voltage Regulator S9V11MA The through-holes are arranged with a 0.1″ spacing along the edge of the board for compatibility with standard solderless breadboards and perfboards and connectors that use a 0.1″ grid. You can solder wires directly to the board or solder in pieces of the included breakaway 6 ×1 straight male header strip or the 5×1 right-angle male header strip as desired.
PAGE 3
2/8/2018 Pololu - 2.5-9V Fine-Adjust Step-Up/Step-Down Voltage Regulator S9V11MA Output voltage settings for the 2.5-9V Fine-Adjust Step-Up/Step-Down Voltage Regulator S9V11MACMA and S9V11MA. Please note that the output voltage can be set below 2.5 V at the low end of the potentiometer’s range and above 9 V at the high end. While this is not likely to damage the regulator, it might not work reliably or its output could become unstable when the output voltage is not within the recommended 2.
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2/8/2018 https://www.pololu.com/product/2869 Pololu - 2.
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2/8/2018 Pololu - 2.5-9V Fine-Adjust Step-Up/Step-Down Voltage Regulator S9V11MA The maximum achievable output current of these regulators varies with the input voltage but also depends on other factors, including the ambient temperature, air flow, and heat sinking. The graph below shows maximum output currents that these regulators can deliver continuously at room temperature in still air and without additional heat sinking.
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2/8/2018 Pololu - 2.5-9V Fine-Adjust Step-Up/Step-Down Voltage Regulator S9V11MA Note that the startup current for input voltages above the regulated output voltage is limited to approximately 700 mA, and currents in excess of this are only available after the output has finished stabilizing. For input voltages below the output voltage, the available start up current decreases linearly with the input voltage to approximately 0.3 A with an input of 3 V.