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TPS1HC100-Q1: Can TPS1H100-Q1 be used as bi-directional switch to charge and discharge (2 to 3A) supercaps (100-500mF) at 5V to 20V ranges?

Raza Qazi
Prodigy 50 points
Part Number: TPS1H100-Q1
Other Parts Discussed in Thread: TPS1HC100-Q1, , TPS25948

Tool/software:

Please note that I got the part number confused in the title, I am inquiring about TPS1H100-Q1 and not TPS1HC100-Q1. The reason being that only TPS1H100-Q1 datasheet explains proper operation while FET is ON in reverse polarity. 

I am looking for a bi-directional high side switch capable of controlling voltages between 5V to 23V and a DC current load of 2.5A or higher in both directions. Since our loads are supercaps, slew rate control is nice to have but not critical. Datasheet mentions that it does not have any protection against reverse currents and requires external components to block it. 

a) Can you please suggest if this part can work for our use case?

b) Also, to minimize area on PCB, which of its external passives can be removed from the schematics?

  • +1
    TI__Mastermind 28300 points

    Hi Raza,

    Welcome to e2e!

    Yes, TPS1H100-Q1 can do this, but I would be very careful that the reverse current does not create a high enough voltage to bias the body diode - this could allow for unrestricted current that the device cannot block and may be damaged by. This device cannot limit reverse current. Also, you will need to ensure VS stays within a valid operating region and doesn't drop too low.

    Is this may be a problem, then please see that we have a few eFuses with bidirectional current support like TPS25948.

    Going by the Typical Applications circuit - if you are not driving an inductive load, then the RSERs can be omitted. If you are not expecting a reverse battery situation to be possible, the ground network can be omitted. If you are not using the ST pin, it can be connected to GND or left floating. If you are not using the current limit, you can connect CL directly to GND. If you are not using the current sense, you can connect CS to GND via a 1k resistor, and not place the low pass filter.

    Thanks,

    Patrick