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Original question:

LP87561-Q1: LP87561-Q1 same function

LP8758-B0: LP8758-B0 power sense FB_B0,FB_B1 when PMIC reset

Kevin Huang67
Intellectual 370 points
Part Number: LP8758-B0

Hi Sir,

I am afraid of no load for LP8758-B0 when use it, then the sense feedback will destroy the LP8758-B0.

If send reset command to LP8758-B0, then Vout is 0V, the LP8758-B0's sense function will off ?

 

  • 0
    TI__Mastermind 38821 points

    Hi Kevin,

      Please share your schematics so I can answer your question. 

    Thanks!
    Phil

  • 0 in reply to Phil Yi40
    Intellectual 370 points

    Hi Phil,

    Can I mail to you because I can't insert pdf file ?

  • 0 in reply to Kevin Huang67
    TI__Mastermind 38821 points

    Hi Kevin,

      You can insert a pdf file by following steps:

    Thanks!

    Phil

  • 0 in reply to Phil Yi40
    Intellectual 370 points

    Hi Sir,

    I use this method but it has below error message.

    "The File with identifier 'public_power_clock board-1026_v2.pdf' could not be found."

  • 0 in reply to Kevin Huang67
    Intellectual 370 points

    Hi Phil,

    I think that my company has secret issue, so I can't use insert method to attach file.

    I describe as below for two used situations.

    I do power board to use LP8758-B0 with connector to plug in SOC board.

    1. When I don't plug in the power board to SOC board for connecting to power plane and SOC, I just use 0 ohm resistor to connect the FB_B0 to 0.1uF capacitance, FB_B1 to GND at power board's connector side. Is it no problem for PMIC feedback? When I use reset function to always reset PMIC, is it OK. ?

    2. When I plug in the power board to SOC board for connecting to power plane and SOC, I will remove the 0 ohm to disconnect the FB_B0 to 0.1uF capacitance, FB_B1 to GND at power board's connector side and it's no problem for FB_B0 using 8 mil trace to connect to power plane(with many cap. on power plane) and FB_B1 using 8 mil trace to GND for used power plane. But some PMIC channels are not used, if I use reset function to always reset PMIC, is it OK. ?

  • 0 in reply to Kevin Huang67
    TI__Mastermind 38821 points

    Hi Kevin,

      I'm sorry; I don't understand what you said. Please contact your TI local FAE and then share your detail document and schematics with him/her and then he/she can send me Email for the review. I'm not allowed to share my email address here. 

      Please check the device datasheet, there is a simple schematic drawing (inserted below); the device always need a close up feedback loop no matter loaded or unloaded. 

     

    Thanks!

    Phil