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TPS65094: Data Sheet: different specs for PVINSWA1, PVINSWB1_B2; PVINLDOA2_A3, SWB1, SWB2, SWA1?

Hans
Genius 12865 points
Part Number: TPS65094

Hello Team,

according data sheet, revised May 2019:

Table in Chapter 5.3,  Recommended Operating Conditions:

PVINSWB1_B2, PVI_LDOA2_A3, SWB1, SWB2 shows a maximum voltage of 1.8V,

resp. PVIN_SWA1, SWA1 max 3.6V:

Chapter 5.9 lists LDO2, LDO3 with VIN max. 1.98V (=Pin PVINLDOA2_A3):

 

Then in chapter 5.10 

SWA1. VIN max 3.3V (= PIn PVINSWA1)

SWB1_2: VIN max 3.3V (= PIN PVINSWB1_B2)

 

In the Summary Table 6-1:

Input Voltage:  1.98V for LDO2, LDO3

Input Voltage: 3.3V for SWA/SWB

Question:

Which maximum voltages are allowed for PVINSWA1, PVINSWB1_B2; PVINLDOA2_A3, SWB1, SWB2, SWA1, please?

Thanks and Best Regards,

Hans

  • 0
    TI__Genius 12735 points

    Hi Hans,

    The absolute maximum allowable voltage on the PVINSWA1, PVINSWB1_B2; PVINLDOA2_A3, SWB1, SWB2, SWA1 pins can be found in the Absolute Maximum Ratings table in section 5.1 of the TPS65094 Datasheet. 

    As for how you should use the regulators in your design I would recommend following the values seen in sections 5.9 and 5.10. The recommended conditions table provides the voltages we recommend using the device at but this table does not provide any absolute values.

    Best regards,

    Layne J

  • 0 in reply to Layne J
    TI__Genius 12865 points

    Hi Layne,

    please confirm that the load switches SWB1 and SWB2 accept an input voltage of 3.3V.

    If this is true then Table 5-3 must be corrected; do you agree?

    table 5.3: Recommended Operating Conditions:

    5.10 Electrical Characteristics: Load Switches:

    table 6-1:

    Thanks and Best Regards,

    Hans

  • 0 in reply to Hans
    TI__Genius 17380 points

    Hi Hans,

    For Intel Apollo Lake, SWB1_2 is used for V1P8U, so the recommended input voltage is 1.8V. LDOA2/A3 are set to 1.2V/1.25V for most OTPs, so the recommended input voltage is 1.8V. So Table 5-3 is correct - recommending 3.3V would potentially damage boards and lead to high thermal loss.

    It does not say that they can't use 3.3V input though. It is just describing the recommended condition for use with Intel Apollo Lake. 3.3V is a valid input for both, assuming they aren't being used.

  • 0 in reply to Kevin LaRosa
    TI__Genius 12865 points

    Hi Kevin,

    this is for Apollo Lake! Can you confirm that pins PVINSWB1_B2, PVIN_LDOA2_A3 can be powered with 1,89V, please?

    Thanks and Best Regards,

    Hans

  • 0 in reply to Hans
    TI__Genius 17380 points

    Hi Hans,

    I would not recommend a 1.89V supply, generally these rails are +-5%, so if the supply starts at +5%, then I would expect it to violate Intel's requirement. Note that the PMIC can support up to 3.6V, it's just the Intel processor we are recommending 1.8V use with. If you just mean 1.8V supply with +-5%, then that would be what we are recommending.

  • 0 in reply to Kevin LaRosa
    TI__Genius 12865 points

    Hi Kevin,

    ok, Vin = 1.8V +/-5%, this is what I meant! 

    But, independently which processor will be powered the specifications are related to the TI part and should be consistent within the data sheet. I still don't understand why table 5-3 recommends max 1.8V (maybe we should add +/-5%) while all other specifications for the same pins list 3.3V.

    Thanks and Best Regards,

    Hans

  • 0 in reply to Hans
    TI__Genius 12735 points

    Hi Hans,

    The recommended values in table 5-3 are in reference to the typical application for Apollo Lake and the maximum voltage the processor will allow. This however is not the maximum TPS65094 is capable of handling. Our datasheet provides the recommendation to align the end user with the required values from Intel however that is not the specification for our device.

    In the end it is the responsibility of the customer to ensure their usage of our device in their system meets their requirements and is used properly for their needs.

    Best regards,

    Layne J

  • 0 in reply to Layne J
    TI__Genius 12865 points

    Hi Layne,

    if table 5.3 is valid only for Apollo Lake we should mention this in the data sheet. 

    Best Regards, Hans

  • 0 in reply to Layne J
    TI__Genius 12865 points
    Layne J said:
    Our datasheet provides the recommendation to align the end user with the required values from Intel however that is not the specification for our device.

    so, what is the specification of your device, please? It is not mentioned in the data sheet, table 5.3, that 

    VCC_1P8V_A = 1,8V +-5% = max 1,89V. So even for Apollo Lake table 5.3 lists max 1.8V. 

  • 0 in reply to Hans
    TI__Genius 17380 points

    Hi Hans,

    I am back from paternity leave now, thank you for your patience.

    The load switches can support up to 3.6V per the absolute max table.