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TPS2HB35-Q1: Voltage drop observed in extended voltage case

Sahil Berde
Intellectual 730 points
Part Number: TPS2HB35-Q1
Other Parts Discussed in Thread: TPS2H000-Q1, , HSS-MOTHERBOARDEVM

Hi,

In the recommended operating conditions section of datasheet

Maximum extended supply voltage is given as 28V. 

There is a note given for the extended supply voltage is that 'device would function within extended operating range, however some parametric values might not apply'

Can you please evaluate more on the note. On my board the IC is running on 12V or 24V. When 12V supply a maximum of 110mA can be drawn at the output of the IC.

When a 24V supply is given, a maximum of 40mA can be drawn at the output of the IC.

When given 24V supply there is 4V drop observed at JP1 on no load condition. When i draw 25mA on that line the voltage drops to 5mA. Can you tell me reason for that behaviour?

Shown schematic section below

Regards,

Sahil

  • 0
    TI__Mastermind 19034 points

    Sahil,

    The first thing that pops out here is that the device you are using is out of line with your load current. This device is designed to handle 3.5A steady state so anything in the mA range is outranked for this device. I would recommend using the TPS2H000-Q1 as it will be a better fit at a better price.

    Next- the TPS2HB35-Q1 is only designed to work at 12V nominal. It can support up to 28V to survive automotive transients such as a load dump, however it is not recommended to run steady state at anything above 18V as short-to-grounds in this range could cause damage.

    Everything that you described here points to some sort of short being between output and ground. There should be no 4V drop associated with a 35mOhm RON device. Please double check soldering connections or test on an HSS-MOTHERBOARDEVM for validation. 

  • +1
    Intellectual 730 points

    Hello Timothy,

    Thanks for the quick reply.

    I selected IC because it was only load switch I could found which is 2channel, can handle 24V(because there is no clear message written what would work and what would not in the datasheet) and handle current spike

    The ic which you suggested is out of stock on digikey and mouser with long lead times.

    Can you suggest alternate load switch which in stock?

    If not load switch can you suggest me a 2ch mux capable of handling 12V and 24V steady state and having capability of handling current spike of min 2A

  • 0 in reply to Timothy Logan
    Intellectual 730 points

    Hi,

    There was some problem with the shorting hence there was some drop. But we cleared that issue

    We got the IC with 24V steady supply too. Also got both the channels running on no load and load as well.

    I would be using the IC as a 2ch mux which would be having ability to handle current spike.

    Can you tell me more about the part which you suggested whether it would work. We wanted to be sure. Also the part is not in stock anywhere. Are you sure it would be in stock soon?

    If possible can you suggest me one more alternate ?

  • 0 in reply to Timothy Logan
    Intellectual 730 points

    Hi Timothy,

    My customer wants to discuss with you regarding testing of this IC.

    He wants to connect with you so that we three can discuss.

    Can you send your email id in the private message?

    I have sent you friend request