![]() 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). After it is running, it can continue operating down to 2 V. The input voltage, VIN, should be between 3 V and 16 V when the regulator is first powered. See the Setting the output voltage section below for details. The output voltage, VOUT, is determined by the trimmer potentiometer position. The board also contains a through-hole labeled SEL that is not used on this version of the regulator. 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). Take care when handling this product or other components connected to it. Integrated over-temperature and short-circuit protection.Power-saving feature maintains high efficiency at low currents (quiescent current is less than 1 mA while enabled).Power-good indicator can be used to tell when the regulator has reached and is maintaining its target output voltage.Precision-adjustable low-voltage cutoff with hysteresis can be used to protect batteries from over-discharging (quiescent current is approximately 10 ♚ per volt on VIN when regulator is disabled).Typical maximum continuous output current: 1.5 A (when input voltage is close to the output the Typical efficiency and output current section below shows how the achievable continuous output current depends on the input and output voltages).Output voltage: 2.5 V to 9 V (precision-adjustable using built-in 12-turn potentiometer).Input voltage: 2 V to 16 V (note: this regulator requires 3 V to start, but it can operate down to 2 V after startup).Note that the startup current is limited to approximately 700 mA until the output voltage reaches the nominal voltage after startup, the available current is a function of the input voltage (see the Typical efficiency and output current section below). These regulators have short-circuit protection, and thermal shutdown prevents damage from overheating they do not have reverse-voltage protection. Step up/step down regulator S9V11F3S5 on a breadboard. ![]() Step up/step down regulator S9V11MACMA on a breadboard. It is disabled when the input voltage is below the low-voltage cutoff. * The regulator has a minimum start-up voltage of 3 V, but it can operate down to 2 V after startup. The chart below lists all the regulators in the S9V11x family along with the key features of each version: This is particularly useful for battery chemistries that can be damaged when over-discharged, including Li-ion and LiPo. ![]() Some versions also have an adjustable low-voltage cutoff that can be set anywhere in the 2 V to 16 V output voltage range and used to prevent your battery from over-discharging. The different members of this family offer different output voltage options, from fixed voltages with selectable alternatives to adjustable voltages that can be set anywhere between 2.5 V and 9 V using a precision 12-turn potentiometer. Without the typical restriction on the battery voltage staying above the required voltage throughout its life, new battery packs and form factors can be considered. The flexibility in input voltage offered by this family of regulators is especially well-suited for battery-powered applications in which the battery voltage begins above the regulated voltage and drops below as the battery discharges. They take input voltages from 2 V to 16 V and increase or decrease them as necessary, offering a typical efficiency of over 85% and a typical output current of up to 1.5 A. The S9V11x family of efficient switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) use a buck-boost topology to convert both higher and lower input voltages to a regulated output voltage.
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