# S9V11x Step-Up/Step-Down Voltage Regulators

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. 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 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. 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 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. 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. This is particularly useful for battery chemistries that can be damaged when over-discharged, including Li-ion and LiPo. The chart below lists all the regulators in the S9V11x family along with the key features of each version:

Regulator Input (V) Output (V) Low-voltage cutoff Size Price
#2868 S9V11MACMA 2* – 16 2.5 – 9 (fine-adjust) fine-adjust 0.50″ × 0.60″ × 0.25″ $16.95 #2869 S9V11MA 2.5 – 9 (fine-adjust)$13.95
#2870 S9V11F5S6CMA 5 (6 V selectable) fine-adjust $13.95 #2871 S9V11F3S5CMA 3.3 (5 V selectable) fine-adjust$13.95
#2872 S9V11F3S5 3.3 (5 V selectable) 0.50″ × 0.60″ × 0.17″ $10.95 #2873 S9V11F3S5C3 3.3 (5 V selectable) 3 V (fixed)$10.95
#2836 S9V11F5 5 0.30″ × 0.45″ × 0.17″ \$19.95
* The regulator has a minimum start-up voltage of 3 V, but it can operate down to 2 V after startup. It is disabled when the input voltage is below the low-voltage cutoff.

These regulators have short-circuit protection, and thermal shutdown prevents damage from overheating; they do not have reverse-voltage protection. 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 sections on the product pages for more information).

## Products in category “S9V11x Step-Up/Step-Down Voltage Regulators”

 Pololu item #: 2868 Brand: Pololu Status: Rationed (Active and Preferred)
Temporarily out of stock. See product page to backorder.
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The S9V11MACMA switching step-up/step-down regulator efficiently produces a finely adjustable output between 2.5 V and 9 V whether it is higher or lower than the input voltage, which can range from 3 V to 16 V. The regulator also has a precision-adjustable low-voltage cutoff with hysteresis that can be used to prevent battery over-discharge. The compact (0.5″ × 0.6″) module can supply a typical output current of up to 1.5 A when the input voltage is close to the output voltage.

 Pololu item #: 2869 Brand: Pololu Status: Rationed (Active and Preferred)
Temporarily out of stock. See product page to backorder.
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## 2.5-9V Fine-Adjust Step-Up/Step-Down Voltage Regulator S9V11MA

The S9V11MA switching step-up/step-down regulator efficiently produces a finely adjustable output between 2.5 V and 9 V whether it is higher or lower than the input voltage, which can range from 2 V to 16 V. (Note: minimum start-up voltage is 3 V, but it operates to 2 V after that.) The compact (0.5″ × 0.6″) module can supply a typical output current of up to 1.5 A when the input voltage is close to the output voltage.

 Pololu item #: 2870 Brand: Pololu Status: Rationed (Active and Preferred)
Temporarily out of stock. See product page to backorder.
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## 5V Step-Up/Step-Down Voltage Regulator w/ Adjustable Low-Voltage Cutoff S9V11F5S6CMA

The S9V11F5S6CMA switching step-up/step-down regulator efficiently produces a fixed 5 V (default) or 6 V (selectable) output whether it is higher or lower than the input voltage, which can range from 2 V to 16 V. (Note: minimum start-up voltage is 3 V, but it operates to 2 V after that.) The regulator also has a precision-adjustable low-voltage cutoff with hysteresis that can be used to prevent battery over-discharge. The compact (0.5″ × 0.6″) module can supply a typical output current of up to 1.5 A when the input voltage is close to the output voltage.

 Pololu item #: 2871 Brand: Pololu Status: Rationed (Active and Preferred)
Temporarily out of stock. See product page to backorder.
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## 3.3V Step-Up/Step-Down Voltage Regulator w/ Adjustable Low-Voltage Cutoff S9V11F3S5CMA

The S9V11F3S5CMA switching step-up/step-down regulator efficiently produces a fixed 3.3 V (default) or 5 V (selectable) output whether it is higher or lower than the input voltage, which can range from 2 V to 16 V. (Note: minimum start-up voltage is 3 V, but it operates to 2 V after that.) The regulator also has a precision-adjustable low-voltage cutoff with hysteresis that can be used to prevent battery over-discharge. The compact (0.5″ × 0.6″) module can supply a typical output current of up to 1.5 A when the input voltage is close to the output voltage.

 Pololu item #: 2872 Brand: Pololu Status: Rationed (Active and Preferred)
Temporarily out of stock. See product page to backorder.
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## 3.3V Step-Up/Step-Down Voltage Regulator S9V11F3S5

The S9V11F3S5 switching step-up/step-down regulator efficiently produces a fixed 3.3 V (default) or 5 V (selectable) output whether it is higher or lower than the input voltage, which can range from 2 V to 16 V. (Note: minimum start-up voltage is 3 V, but it operates to 2 V after that.) The compact (0.5″ × 0.6″) module can supply a typical output current of up to 1.5 A when the input voltage is close to the output voltage.

 Pololu item #: 2873 Brand: Pololu Status: Rationed (Active and Preferred)
Temporarily out of stock. See product page to backorder.
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## 3.3V Step-Up/Step-Down Voltage Regulator w/ Fixed 3V Low-Voltage Cutoff S9V11F3S5C3

The S9V11F3S5C3 switching step-up/step-down regulator efficiently produces a fixed 3.3 V (default) or 5 V (selectable) output whether it is higher or lower than the input voltage, which can range from 3 V to 16 V. The regulator also has fixed 3 V low-voltage cutoff with hysteresis that can be used to prevent battery over-discharge. The compact (0.5″ × 0.6″) module can supply a typical output current of up to 1.5 A when the input voltage is close to the output voltage.

 Pololu item #: 2836 Brand: Pololu Status: Rationed (Active and Preferred)
Temporarily out of stock. See product page to backorder.
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## 5V Step-Up/Step-Down Voltage Regulator S9V11F5

The S9V11F5 switching step-up/step-down regulator efficiently produces 5 V from input voltages between 2 V and 16 V. (Note: it requires an input voltage of at least 3 V to start, but it can operate down to 2 V after startup.) Its ability to convert both higher and lower input voltages makes it useful for applications where the power supply voltage can vary greatly, as with batteries that start above but discharge below 5 V. The very compact (0.3″ × 0.45″) module has a typical efficiency of over 90% and can supply a typical output current of up to 1.5 A when the input voltage is around 5 V.

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