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BQ25505: Recommended load switch for load powered by BQ25505

Part Number: BQ25505

Hello, 

I'm trying to implement the circuit shown in the datasheet. 

As can be seen two load switches are connected to the VSTOR and VBAT_PRI to switch between the backup and rechargeable storage. Is there any recommended load switch that I could use for this application? It definitely needs to switch between the two extremely fast and the maximum voltage is at 5V. 

  • Hello,
    Your question has been forwarded to the Load switch expert.

    Best Regards,

    Upal Patel

    Product Marketing Engineer

    Texas Instruments Inc

  • Hi Vahid,

    If you are looking to switch between two input sources to power the system, you may want to take a look at some of our power muxes. The TPS2115A is a good option if you want to switch manually, but if you'd like automatic switchover then you can take a look at out TPS2113A device. Let me know if you have any additional questions.

    Thanks,

    Alek Kaknevicius


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

  • In reply to Aleksandras_Kaknevicius:

    TPS2113A was exactly what I was looking for. Thanks! 

  • In reply to Aleksandras_Kaknevicius:

    Hi Alek, 

    I ended up using the TPS2115A power muxes which works as expected. However, based on the datasheet, the supply and leakage currents are relatively high compared to the harvested power. I can see that the voltage increment on the rechargeable source (VBAT_SEC pin) decreases when I connect this pin to the mux IN2 pin (when IN2 is in inactive mode). My goal is to reduce the mux leakage current as much as I can. Do you have any solution for this?  

    Thanks,

    Vahid

  • In reply to Vahid Montazeri63:

    Hi Vahid,

    Are you referring to the operating current or the standby current for the device? Either way, we do not have any tricks for reducing these currents since the device needs these for proper operation and protection features.

    Thanks,

    Alek Kaknevicius


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

  • In reply to Aleksandras_Kaknevicius:

    I used the following circuit rather than a multiplexer and the leakage is much lower: 

    The "microcontroller" is basically the BQ25505 IC that has two outputs (pins 9 and 10) to switch between the primary and secondary sources. 

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