Pololu TPS2116 Power Multiplexer Carrier with USB Type-C Connector (USB priority)

The TPS2116 power multiplexer from Texas Instruments facilitates seamless switching between two power sources ranging from 1.6 V to 5.5 V, supporting up to 2.5 A of continuous current while preventing reverse current flow. It features an adjustable switching threshold to minimize output voltage droop during transitions. The multiplexer uses internal MOSFET switches, avoiding the voltage drop associated with diode-based solutions. The TPS2116 carrier boards break out all features to 2.54 mm-spaced pins, ensuring compatibility with standard solderless breadboards. Additionally, the board includes a USB Type-C connector for powering one of the input rails.

This multiplexer automatically selects the power source with the higher voltage by default. However, it can be configured to prioritize a specific input until the voltage falls below a set threshold. A common use case is powering a device via USB or an external source, automatically selecting the connected option. Two versions are available: one prioritizes USB power, while the other prioritizes a non-USB source.

The TPS2116 carrier board is ideal for projects requiring reliable power source management. Its ability to switch seamlessly between power inputs makes it suitable for battery-powered devices that can also be charged via USB. The board's compact design and straightforward pin configuration simplify integration into existing projects, allowing for easy prototyping and testing.

Pin configuration is straightforward, with connections for two power inputs, a multiplexed output, and multiple control pins. The board's through-holes are spaced at 2.54 mm for compatibility with solderless breadboards and standard headers. Mounting holes accommodate M2 screws for secure installation.

The MODE and PR1 pins offer flexibility in controlling the multiplexer’s behavior. The default autoswitching mode selects the higher voltage input, while setting MODE high allows for manual control via PR1. This setup can be further customized with external resistors to adjust the switching threshold, providing precise control over power source selection.

When used with USB, the board allows for easy integration of USB power as one of the inputs. This feature is particularly useful for projects where USB charging is preferred or required. The board's design ensures that USB power is prioritized when configured accordingly, providing a seamless user experience.

For applications drawing significant current, additional input capacitance is recommended to prevent voltage spikes that could damage the TPS2116. The board includes some onboard capacitance, but high-current applications may benefit from extra capacitance at the output to stabilize voltage during transitions.

Overall, the TPS2116 carrier board offers a robust solution for managing multiple power sources in a compact and user-friendly package, making it an excellent choice for a wide range of electronic projects.