Battery (3.6V) or adapter (5V) power supply switch solution

Hi Elsa, 

Thanks for reaching out on E2E! 

It looks like you're looking for a 2:1 power mux solution. To clarify, you're looking for a device that can take either a 5V adapter input or 3.6V battery and choose one for the output. I'm assuming that priority should be given to the 5V adapter whenever it is present, and the system should switch to the 3.6V battery only when the 5V adapter is not present. Is my understanding correct?

If so, I recommend taking a look at our TPS2121. This device recently released, and can support up to 4.5A. If you look at the Applications Section of the datasheet, we highlight a few common applications and how to configure the device for each secnario. I recommend looking at the automatic switchover configuration for the TPS2121, on page 22 (XCOMP). Instead of using a 12V and 5V input in the example, you can reconfigure the resistor dividers for 5V and 3.6V inputs.

Let me know if you have any questions!

Thanks,

Thanks,

Arthur Huang

To find the latest information on Power Switches, visit www.ti.com/powerswitch

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