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Original question:

TPS65218D0: Difference between TPS65218D0/15/25/35/45

TPS6521835: Default start-up voltages vs DC34_SEL resistor

Slawomir Tyborczyk
Prodigy 10 points
Part Number: TPS6521835
Other Parts Discussed in Thread: TPS6521815

Tool/software:

Hi,

I'm planning to use TPS6521835 as a PMIC for my i.MX6ULL design. The default start-up voltages perfectly fit my needs, hence the part selection; I don't want to have to program the PMIC at the testing and programming stage.

DCDC1: 1.28-V Default, up to 1.8 A

DCDC2: 1.35-V Default, up to 1.8A

DCDC3: 3.3-V Default, up to 1.8 A

DCDC4: 1.8-V Default, up to 1.6 A

But I have no idea what to do with RSEL resistor as the resistance table does not include this combination DCDC3 = 3.3V and DCDC4 = 1.8V and I'm afraid that any pulldown resistor connected to DC34_SEL will overwrite my default voltage values.

Should it be DNP? Should I change to some other part number?

I briefly checked that for example datasheet for TPS6521815 allows to select programmed default. 

  • +1
    TI__Expert 5195 points

    Hi Slawomir,

    It appears this is an error in the documentation, and it should be updated immediately. 
    The table values from TPS6521815 appear to have been copied to TPS6521835 mistakenly. 

    If you are seeking to follow the default programmed values (DCDC3 = 3.3 V, DCDC4 = 1.8 V), then yes, the resistor should simply be 0 Ω to GND.
    This will allow the device to follow the preprogrammed values and not overwrite the output voltages.

    Apologies for the confusion, and please do not hesitate to reach out if you have further inquiries.

    Best Regards, 
    Sarah

  • 0 in reply to Sarah Lao
    Prodigy 10 points

    Perfect, thanks for the information.