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TPS65217: VIO POWER INPUT RANGE AND USE NOT CLEAR FROM THE DATASHEET

Chandrashekhar V9
Intellectual 400 points
Part Number: TPS65217
Other Parts Discussed in Thread: USB2ANY

Hi,

I like to know what is the purpose of VIO pin,

1. is it only used for buffers as mentioned below

2.It is also using of TPS65217 internal logic power. 

3. Do it require ay power sequencing or can supply power at any time

4. What is the voltage range it can with stand.Can supply 3.3V to this pin from LDO4(considering am using TPS65217C)

Rgds

Chandra

  • 0
    TI__Genius 9380 points
    Chandra,
    I have passed your question to the product specialist. He will be able to help you with this.
  • 0
    TI__Mastermind 30310 points
    Chandra,

    The absolute maximum range for VIO is covered by "Input/output voltage (with respect to PGND)" in the row "All pins unless specified separately", so the maximum voltage allowed on the VIO pin is 7V.

    This voltage is used as the supply for the high-side FET of the push-pull output pins. There are only two of them: PGOOD and LDO_PGOOD.

    The VIO voltage is not used as the power supply to "internal logic power". The digital core of the TPS65217 is powered from the Power Path (AC or USB, and then BAT if AC or USB are not available).

    The VIO voltage sequencing should match LDO4, because this is the default power supply to the VIO pin.

    Additionally, if VIO is high when AC and USB are low, there will be a leakage path from VIO to SYS and BAT when the PMIC is in the SLEEP or OFF states. This produces a voltage of around 1.2V and can be observed on the EVM when a USB2ANY adapter is connected before AC or USB is applied.