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Original question:

LP87564-Q1: LP87564-Q1 - configuration of default output voltages

LP87564-Q1: Individual PGOOD signal

Alan O
Mastermind 32575 points
Part Number: LP87564-Q1

Hello,

My customer would like to know if there is a way to configure the ENx pins as individual PGOOD for BUCKx, for example, configure EN1 as a GPIO output and report PGOOD status of BUCK1 directly?  

They want to use these pins for power sequence.  Since there are 4 bucks in LP87564, they want to ramp up BUCK0 and BUCK1 first, then use PGOOD of BUCK1 to enable an external regulator.  When the external regulator is up, continue BUCK3 and BUCK4 ramp.

They prefer this configuration be loaded at bootup; after that, no software involvement is needed.

I did not see a way to configure ENx pins as individual PGOOD signals in the datasheet, but I believe an individual PGOOD could be output from the PGOOD pin or nINT pin with proper masking of PG or Interrupt controls, is that correct?

Thanks,

Alan

  • 0
    TI__Genius 10270 points

    Hi Alan,

    There is no way to configure ENx pin as individual PGOOD pin per BUCK. PGOOD and nINT pin can signal PGOOD of one or several BUCK outputs. But this is not intended use of PGOOD to control external enables, also we lost PGOOD signal for remaining rails voltage monitor purposes.

    Of course this is highly system/application dependent but recommended way is to use LP87564 device ENx/GPIOx pins with defined delays to control external device enables and use PGOOD to monitor LP87564 BUCK outputs.

    Also one note that shutdown sequence has to be taken care of if system requires that.

    Please let me know if that clears your expectations.