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Step-Up/Step-Down Voltage Regulators
Buck-boost and SEPIC converters work with input voltages that are higher than, equal to, or lower than the regulated output voltage, making them 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. For applications where the input voltage will always be well above or below the output, consider step-down or step-up regulators. The following table shows some of the key stats for the regulators in this category:
| Regulator | Output voltage (V) | Typical max output current | Input voltage range | Typical efficiency | Size | Price |
|---|---|---|---|---|---|---|
| #4082: S13V30F5 | 5 V | 3 A | 2.8 V – 22 V | 85% – 95% | 0.9″ × 0.9″ | $12.95 |
| New! S13V25Fx family |
3.3, 6, 7.5, 9, 12, 15 | 2.5 A | 2.8 V – 22 V | 85% – 95% | 0.9″ × 0.9″ | $13.95 |
| #4085: S13V20F5 | 5 V | 2 A | 2.8 V – 22 V | 85% – 95% | 0.35″ × 0.475″ | $12.95 |
| #4084: S13V15F5 | 5 V | 1.5 A | 2.8 V – 22 V | 85% – 95% | 0.35″ × 0.475″ | $8.95 |
| #4083: S13V10F5 | 5 V | 1 A | 2.8 V – 22 V | 85% – 95% | 0.35″ × 0.475″ | $6.95 |
| S9V11x family | 2.5 V – 9 V | 1.5 A | 2 V(1) – 16 V | 85% – 95% | varied | $8.95 to $13.95 |
| New! S8V9Fx family |
3.3, 5, 6, 7.5, 9 | 1 A | 1.4 V(2) – 16 V | 80% – 90% | 0.4″ × 0.65″ | $7.49 |
| #2118: S7V8A | 2.5 V – 8 V | 1 A | 2.7 V – 11.8 V | 80% – 95% | 0.45″ × 0.65″ | $7.95 |
| #2122: S7V8F3 | 3.3 V | 1 A | 2.7 V – 11.8 V | 80% – 95% | 0.45″ × 0.65″ | $7.95 |
| #2123: S7V8F5 | 5 V | 1 A | 2.7 V – 11.8 V | 80% – 95% | 0.45″ × 0.65″ | $7.95 |
| #2119: S7V7F5 | 5 V | 1 A | 2.7 V – 11.8 V | 80% – 95% | 0.35″ × 0.475″ | $6.95 |
| S18V20Fx family | 5, 6, 9, 12, 24 4 – 12 9 – 30 |
2 A | 2.9 V – 30 V | 80% – 90% | 0.825″ × 1.7″ | $25.95 to $30.95 |
1 The S9V11x family has a minimum start-up voltage of 3 V, but it can operate down to 2 V after startup.
2 The S8V9Fx family has a minimum start-up voltage of 2.7 V, but it can operate down to 1.4 V after startup.
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Subcategories
This family of synchronous switching step-up/step-down can output voltages higher than, equal to, or lower than their inputs. Output voltages range from 3.3 V to 15 V, input ranges from 2.8 V to 22 V, and maximum continuous output currents are 1 A to 3 A depending on the version.
S9V11x step-up/step-down regulators can output voltages higher, equal to, or lower than their inputs at up to 1.5 A. Output voltages range from 2.5 V to 9 V, input ranges from 2 V to 16 V (with some limitations). Adjustable versions feature multi-turn trimmer potentiometers.
S8V9x step-up/step-down regulators can output voltages higher, equal to, or lower than their inputs. They can deliver up to around 1 A when the input voltage is close to the output. Output voltages range from 3.3 V to 9 V, input ranges from 1.4 V to 16 V (with some limitations).
S18V20x step-up/step-down regulators can output voltages higher, equal to, or lower than their inputs. They can deliver up to 2 A when the input voltage is close to the output. Output voltages range from 4 V to 30 V, input ranges from 3 V to 30 V.
Products in category “Step-Up/Step-Down Voltage Regulators”
| Pololu item #: 2118 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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The S7V8A switching step-up/step-down regulator efficiently produces an adjustable output between 2.5 V to 8 V from input voltages between 2.7 V and 11.8 V. 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 500 mA to 1 A across most combinations of input and output voltages.
| Pololu item #: 2122 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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The S7V8F3 switching step-up/step-down regulator efficiently produces a fixed 3.3 V output from input voltages between 2.7 V and 11.8 V. 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 500 mA to 1 A across most of the input voltage range.
| Pololu item #: 2123 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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The S7V8F5 switching step-up/step-down regulator efficiently produces a fixed 5 V output from input voltages between 2.7 V and 11.8 V. 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 500 mA to 1 A across most of the input voltage range.
| Pololu item #: 2119 | |
| Brand: Pololu | supply outlook |
| Status: Active and Preferred | |
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The S7V7F5 switching step-up/step-down regulator efficiently produces 5 V from input voltages between 2.7 V and 11.8 V. 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 (0.35″ × 0.475″) module has a typical efficiency of over 90% and can supply up to 1 A when stepping down and about 500 mA when stepping up.
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