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LM8261: how much current on positive input?

Part Number: LM8261
Other Parts Discussed in Thread: TPS22968, TPS22976,

Hi.,

my customer enables a VDD_2V5_CASC using TPS22968 analog voltage switch and then using LM8261M5 to generate a 1V supply that is able to both source and sink current. From this 1V supply some 50mA current is used by the load.Having some issues they decided to change to TPS22976 which has a current capacity of 6 Amps instead of the 4A of TPS22968 and they saw some improvement but still have trouble with many of their boards. Now the questions are:

  • How much current does LM8261M5 use on positive input?
  • How much ripple on the output voltage should we expect from TPS22968 and TPS22976 and would this change with the current drawn?

Thanks

Fred

 

  • Hi Fredrick,

    The LM8261 has a max input bias current of -2uA (at 25C). This will be the maximum current flowing out of either the positive or negative input of the op amp. Please see page 5 in section 6.5 of the datasheet.

    Can you please describe the issue they are experiencing? The issue may not be related to the current from the positive input.

    Regarding your questions about the TPS devices, I recommend posting a separate question to the forum about those devices.

    Thank you,

    Tim Claycomb

  • Hi Fredrick,

    Do you have any information about the issue they are experiencing? If you cannot discuss the issue over the public forum please contact me directly.

    Thank you,

    Tim Claycomb