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TPS2115A: ORing Controller for USB OTG vs Schottky diode

JAlvarez
Prodigy 60 points
Part Number: TPS2115A

We are updating the design of an ARM microcontroller board and are considering improving its power muxing. Currently the design uses Schottky diodes to allow powering a 5V rail via either a power jack (2A) or the USB OTG port (500mA) . The 5V rail is used as input to a dual buck converter to produce the 3.3V and 1.8V rails required by the MCU and peripherals.

1. Would the TPS2115A be the best match from TI for a USB ORing controller?

2. An ORing controller has significantly higher costs than two Schottky diodes. Besides reducing losses, what are other advantages from using the ORing controller?

Thanks.

  • 0
    TI__Genius 10370 points

    Hi JAlvarez,

    Welcome to E2E! I'm moving this thread to the appropriate forum so that one of our engineers can respond to your question as quickly as possible :-)

    Best Regards,

    Aramis P. Alvarez

  • 0
    TI__Genius 15710 points

    Hi JAlvarez,

    With your application specifications, the TPS2115A is a good choice for an integrated power mux. The benefits of using this device over two Schottky diodes are listed below:

    1. Power savings and less self-heating of the device (as you mentioned).
    2. The controlled rise time of the device limits the inrush current generated by output capacitance.
    3. A current limit prevents excessive current consumption by the load.
    4. Thermal shutdown adds reliability and protection to the solution.

    Let me know if you have any questions on any of these.

    Thanks,

    Alek Kaknevicius