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TPS2595: Semi-automatic charger multiplexer

Chris Schramm
Intellectual 590 points
Part Number: TPS2595
Other Parts Discussed in Thread: BQ25896

Dear TI-Team,

I've seen an AN suggesting TPS2595 for charging multiplexer.

We plan to use BQ25896 (with USB or Solar input) which should charge two or four batteries in a sequential manner (only charging one battery at a time, others should be sort of disconnected).

For protection and "disconnecting" the "disabled" batteries, I think we could use TPS2595 - one per battery, output wired to charger IC. Is this correct? Will we need the "Quick output discharge" option for that?

And another question: is it possible to use the EN/UVLO pin in a semi-automatic way? It was great if we could use the pin to have the MCU enable or disable a specific TPS2595 (pulling high the EN pin) will still ensuring  that the TPS2595 will only deliver output if voltage is within PGOOD threshold.

Or maybe there is a dual / quad bi-directional power switch perfectly fitting our requirements?

Urgh, I hope this was understandable.. 

  • 0
    TI__Guru 57737 points
    Hi Chris,

    I understand that you want to charge two or four 1S batteries in sequential manner.
    - You will require two efuse to realise a Bidirectional Switch. In case you use only one efuse per battery, there will be reverse current flowing from output of efuse to input of efuse through body diode of the FET.

    - The EN/UVLO pin of the IC can be driven by an external host. The pin can be driven directly from a GPIO without the need for any glue logic. This is mentioned in datasheet section 8.4.2 .

    - Unfortunately, we do not have multi channel bidirectional efuse Ic's in our portfolio yet.
  • 0 in reply to Praveen GD
    Intellectual 590 points
    Hi Praveen,

    thanks for the reply.

    Regarding the EN pin: I know it can be driven by an external host, but I'm wondering if it is still possible to keep the autonomous UVLO. Maybe by combining with an ultra-low resistance FET?
  • 0 in reply to Chris Schramm
    TI__Guru 57737 points
    Hi Chris,

    Yes, you can use a resistor divider for UVLO operation and then have a FET in parallel with the low side resistor which can be controlled by GPIO of a Microcontroller.
    You can consider TPS2592xx series of parts for implementing BPS as well. We have observed less leakage current from Vout to Vin when the part is disabled for TPS2592xx than TPS2595xx.