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TPS65910: TPS659102A ISSUE

xiaowei chen
Intellectual 680 points
Part Number: TPS65910


Dear all:

  Occasionally  TPS659102A BUCK1 and BUCK2 have no output ,others  LDO and BUCK3 output normal, Need insertion and extraction adapter again, the output TPS659102.pdf recovery normal .

  • 0
    TI__Genius 9380 points
    xiaowei,
    I have passed this on to our product specialist for review. you should hear from him soon. Thank you for using E2E.
  • 0
    TI__Mastermind 30310 points
    I believe this issue may be related to VDD3 not being terminated properly.

    The TPS65910 Schematic Checklist (www.ti.com/.../swca139b.pdf) says VFB3 should be connected to GND when VDD3 is not used.

    However, your schematic for VDD1 and VDD2 is also a little strange to me.

    There are a lot of components in the feedback path for both of these DC-DC regulators:
    VDD1 (VDD_ARM) - RS1 and CS2 should not be necessary.
    VDD2 (VCC_DDR) - RS2, RS3, and RS4 are all unnecessary.

    You should test without all of these components to see if the PMIC powers-on correctly 100% of the time (short across RS1 and RS3, remove RS2, RS4, and CS2).