Pololu 5V Step-Up/Step-Down Voltage Regulator S7V8F5
The S7V8F5 switching step-up/step-down regulator efficiently produces a fixed 5V output from input voltages between 2.7V and 11.8V. 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 the regulated voltage. The compact (0.45″×0.65″) module has a typical efficiency of over 90% and can deliver 500mA to 1A across most of the input voltage range.
The Pololu step-up/step-down voltage regulator S7V8F5 is a switching regulator (also called a switched-mode power supply (SMPS) or DC-to-DC converter) that uses a buck-boost topology. It takes an input voltage from 2.7V to 11.8V and increases or decreases the voltage to a fixed 5V output with a typical efficiency of over 90%. The input voltage can be higher than, lower than, or equal to the set output voltage, and the voltage is regulated to achieve a steady 5V.
This flexibility in input voltage is especially well-suited for battery-powered applications in which the battery voltage begins above the desired output voltage and drops below the target 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. For example:
- A 4-cell battery holder, which might have a 6V output with fresh alkalines or a 4.0V output with partially discharged NiMH cells, can be used with this regulator to power a 5V circuit.
- A disposable 9V battery powering a 5V circuit can be discharged to under 3V instead of cutting out at 6V, as with typical linear or step-down regulators.
In typical applications, this regulator can deliver up to 1A continuous when the input voltage is higher than 5V (stepping down). When the input voltage is lower than 5V (stepping up), the available current decreases as the difference between the voltages increases; please see the graphs at the bottom of this page for a more detailed characterization. The regulator has short-circuit protection, and thermal shutdown prevents damage from overheating; the board does not have reverse-voltage protection.
Features
- input voltage: 2.7Vto11.8V
- fixed 5V output with +5/-3% accuracy
- typical continuous output current: 500mA to 1A across most combinations of input and output voltages (Actual continuous output current depends on input and output voltages. See Typical Efficiency and Output Current section below for details.)
- power-saving feature maintains high efficiency at low currents (quiescent current is less than 0.2mA)
- integrated over-temperature and short-circuit protection
- small size: 0.45″×0.65″×0.1″ (11×17×3mm)
Dimensions
| Size: | 0.45″ × 0.65″ × 0.1″1 |
|---|---|
| Weight: | 0.6 g1 |
General specifications
| Minimum operating voltage: | 2.7 V |
|---|---|
| Maximum operating voltage: | 11.8 V |
| Maximum output current: | 1 A2 |
| Output voltage: | 5 V |
| Reverse voltage protection?: | N |
| Maximum quiescent current: | 0.2 mA3 |