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Original question:

LM27761: LM27761 output abnormality, severe chip heating

LM27761: Assistance Required for LM27761 – Unable to Achieve -2.2V Output

Rachit Gautam
Prodigy 10 points
Part Number: LM27761

Tool/software:

Dear Texas Instruments Support Team,

I hope this message finds you well.

We are currently working with the LM27761 Low-Noise Regulated Switched-Capacitor Voltage Inverter in our project, aiming to achieve a -2.2V output. However, despite several attempts and thorough validation of our setup, we have been unable to obtain the desired output voltage.

We have taken the following steps to troubleshoot the issue:

Verified the input voltage as per the datasheet recommendations.
Cross-checked all external components (capacitors, load conditions, etc.) and their values.
Inspected PCB layout and connections to rule out any possible design flaws.
Replaced the component to eliminate the possibility of damage.


Even after these efforts, the output remains inconsistent and does not provide -2.2V as expected.

Could you please guide us on any possible modifications, design considerations, or common issues with this component that might help us resolve this problem? Any insights or suggestions would be greatly appreciated.

Thank you for your support and time. We look forward to your valuable assistance.

Best regards,
Rachit Gautam
Embedded Engineer
Mindwatt Industries Pvt. Ltd.

  • 0
    TI__Mastermind 22150 points

    Hello Rachit,

    thanks for reaching out in E2E.

    Could you please provide more information on the application parameters, such as input voltage, load current?

    The ESR of the used capacitors has a strong impact on the internal resistance of the charge pump. Have you selected SMD multi-layer ceramic capacitors with low ESR as recommended in section 8.2.2.6 to 8.2.2.6.4 in the datasheet?

    I would also suggest to let me review your schematic and layout if you want.

    Best regards,

    Andreas.

  • 0
    TI__Mastermind 22150 points

    Hi,

    There was no feedback since a while, so I assume this tread is resolved and can be closed. You can still reply to this thread after it is closed, or you can create a new thread.

    Best  Regards,
    Andreas.