5V Step-Up/Step-Down Voltage Regulator S7V7F5

Pololu 5V Step-Up/Step-Down Voltage Regulator S7V7F5
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Price: £4.56
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Availability: 49
Model: S7V7F5
Manufacturer: Pololu
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Pololu

5V Step-Up/Step-Down Voltage Regulator S7V7F5

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.

In typical applications, this regulator can deliver about 1 A continuous when the input voltage is higher than 5 V (stepping down) and 500 mA continuous when the input is lower than 5 V (stepping up); 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.

For an adjustable-output version of this regulator, consider our step-up/step-down voltage regulator S7V8A.

Features

  • input voltage: 2.7 V to 11.8 V
  • fixed  5V output with +5/-3% accuracy
  • typical continuous output current: 1 A when stepping down; 500 mA when stepping up (Actual continuous output current depends on input voltage. See Typical Efficiency and Output Current section below for details.)
  • power-saving feature maintains high efficiency at low currents (quiescent current is less than 0.1 mA)
  • integrated over-temperature and short-circuit protection
  • small size: 0.35″ × 0.475″ × 0.1″ (9 × 12 × 3 mm)

Connections

The step-up/step-down regulator has just three connections: the input voltage (VIN), ground (GND), and the output voltage (VOUT). These three connections are labeled on the back side of the PCB, and they are arranged with a 0.1″ spacing along the edge of the board for compatibility with standard solderless breadboards and perfboards and connectors that use a 0.1″ grid.

The input voltage, VIN, should be between 2.7 V and 11.8 V. Lower inputs can shut down the voltage regulator; higher inputs can destroy the regulator, so you should ensure that noise on your input is not excessive, and you should be wary of destructive LC spikes (see below for more information).

The output voltage, VOUT, is regulated to a fixed 5 V, but it can be as high as 5.2 V when there is little or no load on the regulator.

LC Voltage Spikes

When connecting voltage to electronic circuits, the initial rush of current can cause voltage spikes that are much higher than the input voltage. If these spikes exceed the regulator’s maximum voltage, the regulator can be destroyed. If you are connecting more than about 9 V, using power leads more than a few inches long, or using a power supply with high inductance, we recommend soldering a 33 μF or larger electrolytic capacitor close to the regulator between VIN and GND. The capacitor should be rated for at least 16 V.

 

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5V Step-Up/Step-Down Voltage Regulator S7V7F5
Click to enlarge
5V Step-Up/Step-Down Voltage Regulator S7V7F5
Click to enlarge
5V Step-Up/Step-Down Voltage Regulator S7V7F5
Click to enlarge
5V Step-Up/Step-Down Voltage Regulator S7V7F5
Click to enlarge
5V Step-Up/Step-Down Voltage Regulator S7V7F5
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