Pololu 5V Step-Up/Step-Down Voltage Regulator S9V11F5

Description

The S9V11F5 switching step-up/step-down regulator efficiently produces 5V from input voltages between 2V and 16V. (Note: it requires an input voltage of at least 3V to start, but it can operate down to 2V after startup.) 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 5V. The very compact (0.3″ × 0.45″) module has a typical efficiency of over 90% and can supply a typical output current of up to 1.5A when the input voltage is around 5V.

The Pololu step-up/step-down voltage regulator S9V11F5 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 2V to 16V and increases or decreases the voltage to a fixed 5V output with a typical efficiency of over 90%. Note that this regulator requires an input voltage of at least 3V to start, but it can operate down to 2V after startup. Additionally, note that the startup current is limited to approximately 700 mA until the output voltage reaches 5V; after startup, the available current is a function of the input voltage.

The flexibility in input voltage offered by this regulator is especially well-suited for battery-powered applications in which the battery voltage begins above 5V 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. For instance, a 4-cell battery holder, which might have a 6V output with fresh alkalines but a 4.8V nominal voltage with NiMH cells and a 4.0V output with partially discharged cells, can now be used for a 5V circuit. In another typical scenario, 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.

The regulator has short-circuit protection, and thermal shutdown prevents damage from overheating; the board does NOT have reverse-voltage protection.

Features

• Input voltage: 2V to 16V (note: this regulator requires 3V to start, but it can operate down to 2V after startup)
• Fixed 5V output with +5/-3% accuracy
• Typical maximum continuous output current: 1.5A
• 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: 0.3″ × 0.45″ × 0.15″ (7.6 × 11.4 × 3.8 mm)

Connections

The step-up/step-down regulator has just three connections: the input voltage (VIN), ground (GND), and the output voltage (VOUT). These through-holes 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. You can solder wires directly to the board or solder in either the 3×1 straight male header strip or the 3×1 right-angle male header strip that is included. VOUT is labeled on the silkscreen on one side of the board, and GND is in the middle and can be identified by its square pad.

Kit content

• step-up/step-down regulator
• 3×1 straight male header strip
• 3×1 right-angle male header strip