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TPS1HC100-Q1: question for Enable pin of this device

Eduardo Pinera
Prodigy 20 points
Part Number: TPS1HC100-Q1

I’m using this component new into my design: TPS1HC100BQPWPRQ1

Previously I was using TPS1H100AQPWPRQ1 which EN pin Vin High was 2V

That’s why Im using a digital switch to provide 3.3V to EN pin. Using 1.8V from SoC to supply IN signal of digital switch (Pin 2 of Q9)

 

For the new IC Vin High is 1.5V,

Can I get rid of Q9 and connect my SoC directly to EN pin? Do you see a potential risk of not enabling the driver when is needed?

  • 0
    TI__Mastermind 32650 points

    Hi Eduardo,

    The VIH threshold for this device is 1.5V and so 1.8V will turn on the device. The lower logic high level allows the use of 1.8V to control the I/O of the device.

    Please note that even with 1.8V on the DIAG_EN, the fault voltage on the SNS pin will be high. Please view the datasheet for fault voltage levels.

    Thanks,

    Shreyas