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TPS7A7300: Problems occur at low temperatures

Charles Jeon
Expert 2975 points
Part Number: TPS7A7300
Other Parts Discussed in Thread: LMK04808,

Hi team

My client configured the system with the following blocks.

LMK04808 does not work properly when testing -5 ° operation to chamber.

Normally, PLL2 should operate in cascade after PLL1 of LMK04808 operates.

The problem is that PLL1 operates normally at low temperature, but PLL2 does not work.

Please confirm that there is no problem using TPS7A7300 as above.

  • 0
    TI__Genius 10490 points
    Hi Charles,

    Based on this block diagram there is no problem using the TPS7A7300 here. The input and output voltages are within the recommended operating conditions. This LDO has a maximum dropout of 240 mV @ 3.3 V output, so there is plenty of headroom (Vin - Vout). It will also have no problem supplying the required load current. The LMK04808 only requires a maximum current of 590 mA while the TPS7A7300 can provide up to 3 A. If you can provide a schematic of the TPS7A7300 that your client is using in their system I can give you a more thorough evaluation on whether this LDO is causing the issue.

    Thanks,
    Gerard