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:

Step up/step down regulator S9V11MACMA on a breadboard.

Step up/step down regulator S9V11F3S5 on a breadboard.

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 section below).

Details for item #2836

Details for item #2870

Features

• 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)
• Fixed 5 V output with +5/-3% accuracy (can be changed to 6 V using the SEL pin)
• 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)
• Precision-adjustable low-voltage cutoff with hysteresis can be used to protect batteries from over-discharging (quiescent current is approximately 10 µA per volt on VIN when regulator is disabled)
• Power-good indicator can be used to tell when the regulator has reached and is maintaining its target output voltage
• Power-saving feature maintains high efficiency at low currents (quiescent current is less than 1 mA while enabled)
• Integrated over-temperature and short-circuit protection
• Small size: 0.5″ × 0.6″ × 0.25″ (12.7 × 15.3 × 6.4 mm)

Details for item #2871

Features

• 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)
• Fixed 3.3 V output with +5/-3% accuracy (can be changed to 5 V using the SEL pin)
• 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)
• Precision-adjustable low-voltage cutoff with hysteresis can be used to protect batteries from over-discharging (quiescent current is approximately 10 µA per volt on VIN when regulator is disabled)
• Power-good indicator can be used to tell when the regulator has reached and is maintaining its target output voltage
• Power-saving feature maintains high efficiency at low currents (quiescent current is less than 1 mA while enabled)
• Integrated over-temperature and short-circuit protection
• Small size: 0.5″ × 0.6″ × 0.25″ (12.7 × 15.3 × 6.4 mm)

Details for item #2872

Features

• Input voltage: 3 V to 16 V
• Fixed 3.3 V output with +5/-3% accuracy (can be changed to 5 V using the SEL pin)
• 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)
• Fixed 3 V low-voltage cutoff with hysteresis protects batteries from over-discharging (quiescent current is approximately 10 µA per volt on VIN when regulator is disabled)
• Power-good indicator can be used to tell when the regulator has reached and is maintaining its target output voltage
• Power-saving feature maintains high efficiency at low currents (quiescent current is less than 1 mA while enabled)
• Integrated over-temperature and short-circuit protection
• Small size: 0.5″ × 0.6″ × 0.17″ (12.7 × 15.3 × 4.3 mm)

Details for item #2873

Features

• Input voltage: 3 V to 16 V
• Fixed 3.3 V output with +5/-3% accuracy (can be changed to 5 V using the SEL pin)
• 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)
• Fixed 3 V low-voltage cutoff with hysteresis protects batteries from over-discharging (quiescent current is approximately 10 µA per volt on VIN when regulator is disabled)
• Power-good indicator can be used to tell when the regulator has reached and is maintaining its target output voltage
• Power-saving feature maintains high efficiency at low currents (quiescent current is less than 1 mA while enabled)
• Integrated over-temperature and short-circuit protection
• Small size: 0.5″ × 0.6″ × 0.17″ (12.7 × 15.3 × 4.3 mm)

Details for item #2868

Features

• 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)
• Output voltage: 2.5 V to 9 V (precision-adjustable using built-in 12-turn potentiometer)
• 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)
• Precision-adjustable low-voltage cutoff with hysteresis can be used to protect batteries from over-discharging (quiescent current is approximately 10 µA per volt on VIN when regulator is disabled)
• Power-good indicator can be used to tell when the regulator has reached and is maintaining its target output voltage
• Power-saving feature maintains high efficiency at low currents (quiescent current is less than 1 mA while enabled)
• Integrated over-temperature and short-circuit protection
• Small size: 0.5″ × 0.6″ × 0.25″ (12.7 × 15.3 × 6.4 mm)

Details for item #2869

Features

• 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)
• Output voltage: 2.5 V to 9 V (precision-adjustable using built-in 12-turn potentiometer)
• 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)
• Power-good indicator can be used to tell when the regulator has reached and is maintaining its target output voltage
• Power-saving feature maintains high efficiency at low currents (quiescent current is less than 1 mA while enabled and approximately 7 µA per volt on VIN when regulator is disabled)
• Integrated over-temperature and short-circuit protection
• Small size: 0.5″ × 0.6″ × 0.25″ (12.7 × 15.3 × 6.4 mm)