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TPS74201 Bias Input

Florian Augustin
Prodigy 50 points
Other Parts Discussed in Thread: DAC3484, TPS62420, TPS74201

Hello experts :) 

I just read the schematics of the DAC3484 Evaluation module (http://www.ti.com/tool/dac3484evm)
There is a 6V from Connector regulated to 3.6 (3.3_LDO_IN) and 1.2 with a TPS62420 step down converter.
Then with the 3.6V output of the step down converter 3.3V and 1.2V are created with  TPS74201 LDO.

What now is my question: The BIAS Pin of the TPS74201 LDO is not conencted to the 6V power supply but to the 5V of USB. I don't want to use USB so can I use the 6 V of the power supply or is to much "error" on this because it's the Input of a step down converter? 

I attached a part of the schematics, I hope this ok, otherwise please delete it!

Thanks in advance for any advice!
Florian

  • 0
    TI__Guru 55940 points

    Hi Florian,

    The normal operating range for Vbias is 2.375 to 5.25V as shown in the Electrical Characteristics table on page 4 of the datasheet.  While the Absolute Maximum Rating for this pin is 6V, the device is not intended to be exposed to this condition for an extended period of time.

    Very Respectfully,

    Ryan