Source: https://www.robotgear.com.au/Product.aspx/Details/5596-5V-Step-Up-Step-Down-Voltage-Regulator-w-Adjustable-Low-Voltage-Cutoff-S9V11F5S6CMA
Timestamp: 2019-04-25 23:44:17+00:00

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The S9V11F5S6CMA switching step-up/step-down regulator efficiently produces a fixed 5 V output whether it is higher or lower than the input voltage, which can range from 2 V to 16 V.
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). A sixth pin, SEL, can optionally be used to change the output voltage from 5 V to 6 V.
The output voltage, VOUT, defaults to 5 V but can be changed to 6 V with output voltage selection pin whose operation is described below.
The regulator is put in a low-power sleep state when voltage on the EN pin falls below 0.7 V and the regulator is brought out of its low-power state when the voltage on EN rises back above 0.8 V. The quiescent current draw in this sleep mode is dominated by the current in the resistor network from ENABLE to VIN, which is approximately 10 µA per volt on VIN (e.g. approximately 30 µA with 3 V in). The tight tolerance of the enable input allows a precise low-VIN cutoff to be set, which is useful for battery powered applications where draining the battery below a particular voltage threshold could permanently damage it. A multi-turn precision potentiometer connected to the EN input gives the user the ability to adjust the low-voltage cutoff to suite their application. See the Setting the cutoff voltage section below for details.
The select input, SEL, can be driven above 1.1 V (up to 16 V) to change the output voltage of the regulator to 6 V. Driving the pin low or leaving it isconnected sets the output to 5 V.
Solving for EN yields approximately 0.86 V, so you should turn the potentiometer until you measure that voltage on the EN pin.
Note that the regulator’s low VIN cutoff behaviour includes hysteresis: the regulator turns off when EN falls below 0.7 V, but it does not turn back on until EN rises above 0.8 V. Therefore, VIN must reach about 114% of the cutoff voltage before the regulator will re-enable its output (about 3.43 V in this example).
Typical efficiency of Step-Up/Step-Down Voltage Regulator S9V11x with VOUT set to 7.5V.
Note: the minimum startup voltage is 3V, but the regulator can operate down to 2V after startup.
Output can be changed to 6 V by driving the SEL pin over 1.1 V.
With no load. Actual quiescent current depends on input voltage; it is typically under 300 µA when the input voltage is close to the output voltage.

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