LP87702-Q1: LP87702-Q1 Power GOOD

Kygo Cheng

Expert 6830 points

Part Number: LP87702-Q1
Other Parts Discussed in Thread: LP87702

Hi,

How long does it take for LP87702's Power GOOD to activate?
Is there a chance to shorten it?

over 3 years ago

0 Samuli Piispanen over 3 years ago

TI__Expert 4355 points

Hi,

PG0_RISE_DELAY and PG1_RISE_DELAY fields in PG0_CTRL (0x18) and PG1_CTRL (0x1A) registers control the debounce delay of the powergood. From the picture it looks like the bit is set to 1 meaning 11 ms delay. Writing the bit to 0 shortens the delay to around 7 µs.

Best regards,

Samuli Piispanen

0 Kygo Cheng over 3 years ago in reply to Samuli Piispanen

TI__Expert 6830 points

Hi Team,

From LP87702's PG0_CTRL (0x18) and PG1_CTRL (0x1A) Reset are 0h, but the actual power on measured is about 10ms, so customer would like to ask the root cause is OTP default of LP87702 is set to 1?

0 Samuli Piispanen over 2 years ago in reply to Kygo Cheng

TI__Expert 4355 points

Hi Kygo,

The default reset value depends on the used OTP. For catalog LP87702K-Q1 and LP87702D-Q1 solutions the OTP defaults can be found from the following document.

https://www.ti.com/lit/pdf/snvu593

PGx_RISE_DELAY is set to 11 ms for both of the devices.

Best regards,

Samuli Piispanen

Power management

Power management forum

LP87702-Q1: LP87702-Q1 Power GOOD