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LM26484: Power-down Sequencing using LM26484

Leo Chow
Expert 3120 points
Part Number: LM26484
Other Parts Discussed in Thread: TPS65023, TPS650250, LM26480, LM3881

Hi,

I'm looking at LM26484 with the potential to serve as a PMIC to power up a WiFi module. However what I noticed was that module has its own power sequence required to follow so is it okay if I add external components on respective EN pins to simulate the power on sequence?

It'll be helpful if I'm able to simulate behavior of Marvell's 88PG823 using LM26484. Is it possible? Thanks.

Regards,

Leo 

  • 0
    TI__Mastermind 30280 points

    Leo,

    Yes, it is possible. The best example I can think of is the analog sequencing circuits we have created for TPS650250 and TPS65023. Please refer to:

    Power Supply Design for NXP i.MX 6 Using the TPS65023

    The schematic on page 8 shows the analog sequencing circuit, which will perform times power-up and power-down sequencing, and the theory can be applied to any device with manually-controlled hardware enable (EN) pins, such as the LM26484 or LM26480.

  • 0 in reply to Brian Berner
    TI__Expert 3120 points

    Hi Brian,

    thanks for the input, one thing that concerns me though will be the stability of this approach when operate under higher temperature range in which RC components may deviate resulting in consistency issue. Will it be possible to replace the passive components on the EN side with something like low cost clock gen device? Is it feasible that way?

    Regards,
    Leo

  • 0 in reply to Leo Chow
    TI__Mastermind 30280 points

    Leo, 

    Yes, this is also acceptable.

    LM3881 is commonly used as a sequencer.

    If you have another part in mind which you define as "low cost clock gen device" please share the specific part # so I can look at the datasheet.