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S7V8x Step-Up/Step-Down Voltage Regulators
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The S7V8x family of efficient switching regulators (also called switched-mode power supplies (SMPS) or DC-to-DC converters) convert both higher and lower input voltages to a regulated output voltage. They take input voltages from 2.7 V to 11.8 V and increase or decrease them as necessary, offering typical efficiencies of 80% to 95% and typical continuous output currents over 1 A for input voltages close to the output voltage. The graph below shows output currents at which these voltage regulators’ over-temperature protection typically kicks in after a few seconds. These currents represent the limit of the regulators’ capabilities and cannot be sustained for long periods, so the continuous currents that the regulators can provide are typically several hundred milliamps lower.
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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 S7V8x regulators have short-circuit protection, and thermal shutdown helps prevent damage from overheating. The boards do not have built-in protection against reverse voltage, but reverse-voltage protection modules are available for adding that functionality.
| Regulator | Output voltage | Typical max continuous output current* |
Input voltage range | Size | Special features | Price |
|---|---|---|---|---|---|---|
| #2122: S7V8F3 | 3.3 V | 1 A | 2.7 V – 11.8 V | 0.4″ × 0.65″ | Short-circuit protection, thermal shutdown, optional enable input |
$9.95 |
| #2123: S7V8F5 | 5 V | |||||
| #2118: S7V8A | 2.5 V – 8 V | |||||
| *For input voltages close to the output. Actual achievable maximum continuous current is a function of input and output voltage and is limited by thermal dissipation. See the output current graphs on the product pages for more information. | ||||||
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Products in category “S7V8x Step-Up/Step-Down Voltage Regulators”
| 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 #: 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.
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