LP87524J-Q1: Output at PIN 10 is zero for some boards

Can you check register 0x1C (INT_BUCK_0_1), and see if the BUCK0_SC_INT field is latched? If not, can you see if there are any other active interrupts?

Kind regards,

Conner Gillette

BUCK0_SC_INT field is latched, Every time we power cycle this regulator the interrupts should automatically be cleared.

• Only Buck0 has an interrupt, all other bucks have no interrupts
• Register 0x1C readback 0b0000 0010
• Buck0 output voltage is below 0.35V and it did not reach Power-Good
• 

From the datasheet:

"If there is a short circuit at the output and the output voltage does not increase above 0.35-V level in 1 ms, the regulator is disabled, and interrupt is set"

Additionally: "Short circuit (VVOUT < 0.35 V at 1 ms after enable) or overload (VVOUT decreasing below 0.35 V during operation, 1 ms debounce)" causes BUCKx_SC_INT = 1

What does your load look like on Buck0? Are you able to get current measurements from Buck0?

Kind regards,

Conner Gillette

Why Power Good is not being achieved ?

What does your load look like on Buck0? Are you able to get current measurements from Buck0?

The answer to these questions will help you find why Power Good is not being acheived.