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TPS6594-Q1: BUCK and LDO Reboot 15 Times During Power Down Sequence After System Reset

Part Number: TPS6594-Q1
Other Parts Discussed in Thread: TDA4VH, TPS389006

Hi TI Experts,

Customer is using PMIC TPS6594-Q1 connected to the TDA4VH board. During the power down sequence after system reset, they found BUCK and LDO reboot 15 times shown below.

At the beginning, customers think it maybe caused by watchdog, because the default PMIC watchdog setting is shown below.

WD_FAIL_CNT[3:0] >(WD_FAIL_TH[2:0] +WD_RST_TH[2:0])
default: WD_FAIL_TH[2:0]=111=7, WD_RST_TH[2:0]=111=7

Customers have tried the below methods, but the problem still exists.

  1. Set WD_FAIL_TH[2:0]=000, WD_RST_TH[2:0]=000
  2. Set WD_FAIL_TH[2:0]=000, WD_RST_TH[2:0]=000 & Disable watchdog as shown below
  3. Set WD_FAIL_TH[2:0]=000, WD_RST_TH[2:0]=000 & Disable watchdog & Set RECOV_CNT_THR = 3
  4. Set WD_FAIL_TH[2:0]=000, WD_RST_TH[2:0]=000 & Disable watchdog & Set RECOV_CNT_THR = 0

Could you help provide some debugging methods for this problem please?

Thanks a lot!

Kevin