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TPS51120: Help with debugging a circuit - TPS51120 is getting damaged on power up

Part Number: TPS51120

Dear Team,

Can you please see customer question below and advise ?

U22 (on schematics) gets damaged on power up.

The power up sequence includes two stages:

    1. 3_3_ALW and 5V are turned on (light load – CPLD and some pull-up resistors)
    2. 3_3V switched (Q8) from 3_3_ALW (higher load – all other relevant components on board such as (CAVIUM CPU, Marvell ETH switch etc.) and some DC-DC are generated from 5V (DDRs and peripherals)

On the first power up stage, everything is OK.
The damage to U22 often occurs on the second power up stage (higher load) – I have measured up to 11A pick for ~60µsec thru L6.

Can you please review the attached schematics and advise ?

Best regards,

Nir.

1.pdf