TPS659039-Q1: TPS659039 LDO3 output
Part Number: TPS659039-Q1
One of my customer used TPS659039-Q1 as the attached but there is no output.Could you give us some advices?
Beat Regards,Tom Liu
First please measure the voltage on Vreg pin 35 using a scope or DC meter. This is the linear regulator output voltage. The Vreg provides the power FETs gate drives. It should be around 5.8V.
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In reply to Mahmoud Harmouch:
I'm sorry I thought the question is about TPS43351 and double checked the thread and is about TPS659039. Are the VSYS_5V and VSYS_3V3 coming up correctly?
the VSYS_5V and VSYS_3V3，is right，
Now it's suspected that the IC may have failed,Where can the test determine whether the IC fails or not?
In reply to Neal Zhu:
In the PMIC schematic, there is voltage divider 15K/24K on NRESWARM. The voltage on this pin is T_RSTOUT_N x (15K/39K). The level could be wrong.
Can you remove these resistors and check if power up is OK?
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