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MMWAVEICBOOST: LP87524JRNFRQ1 problem

Dawson Huang
Intellectual 265 points
Part Number: MMWAVEICBOOST

Hello,

The voltage we measure in pin8 and pin10 of  LP87524JRNFRQ (shows in the following picture) are only 125mV.

Does it means that this chip is damage or something else?

Thanks.

  • 0
    TI__Genius 15005 points

    Hi,

    This questions is related to the LP87524 IC, so could you please ask in the "Power Managerment" forum?

    Best Regards,

    Anand

  • 0
    TI__Genius 17380 points

    Hi Dawson,

    I have moved your post to power management and assigned it to the device owner. To help with debug, do you have multiple boards showing the same symptom? Can you provide more details on what steps you are taking to get to the point where voltage is 125 mV? For example, what state are the EN1 - EN3 pins?

  • 0 in reply to Kevin LaRosa
    TI__Genius 13850 points

    Hi Dawson,

    What is PGOOD-pin state? If PGOOD pin is low it means there is some problem with BUCKs.

    Do youi have I2C access to LP87562J device to read registers?

    One thing what I see on the schematic is that there is no snubber components on SWx nodes. Datasheet instructs that if VIN => 4.0V there must be snubber resistor and capacitor placed from every BUCK SW node to GND as close to device as possible.

    How about other BUCKs 1,2,3 are those starting normally? How much output capacitance is per output rail since schematics shows only one 22uF per rail. Recommended is 2x22uF per rail.

    Is NRST and EN1 pin staying high all the time?

  • 0 in reply to Jari Niemela13
    TI__Genius 13850 points

    Hi Dawson,

    See datasheet capture regarding snubbers.