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LM26420-Q1: The static current of LM26420-Q1 is too large during operation.

Junjie Yang
Prodigy 10 points
Part Number: LM26420-Q1
Other Parts Discussed in Thread: LM26420
  1.  LM26420-Q1.
  2. Our product uses two LM26420-Q1. When we separately measure the static current of LM26420-Q1, the sum of the static current of VINC and VIND is 24mA, which is basically close to the value in the specification.
  3. In the Electrical Characteristics Per Buck of the specification, whether the VIND and VINC of the chip can be switched to non-switching mode and whether the chip can still output normally under this mode? What can we do to put the chip in non-switching mode? Please give technical support and answer, thank you.

  • 0
    TI__Mastermind 30456 points

    Hello Junjie,

    Thanks for reaching out to us.

    It is possible to make the IC stops switching by biasing the FB1 and FB2 with an external voltage > 0.812V across the GND pin (be careful not to exceed 7V at any point during the testing). However, by doing so, the output voltage will fall out of regulation.

    What is the motivation for doing this experiment? Is it to verify the IQ is within specs?

    Best regards,

    Excel

  • +1 in reply to Excel Regidor
    Prodigy 10 points

    Hi Excel，

    Thank you for your answer.

    Our product has two modes: running mode and listening mode. The software control logic shows that LM26420 needs to work in both modes, but the back-end load power consumption is very low in listening mode. The IQ of this LM26420 is too large, so our product cannot meet the requirement of low power consumption in listening mode. So, we wanted to see if there was any other way to lower its IQ.

    If it is the structure of the chip itself that cannot reduce the IQ, we can only consider other methods such as replacing the chip.

    Best regards,

    Yang Junjie