TLV2370: Missing VDD

Tim K

Prodigy 20 points

Part Number: TLV2370

Tool/software:

Hello,

What will happen to the part if VDD will be lost for a few minutes?

Best regards,

Tim

over 2 years ago

0 Clemens Ladisch over 2 years ago

Guru 325130 points

It will power off.

But the input voltages must not exceed V_DD. If this is possible, you must limit the input current, or disconnect the inputs.

0 Ashley Kang over 2 years ago in reply to Clemens Ladisch

TI__Mastermind 18820 points

Hi Tim,

Please see the Absolute Maximum table in the datasheet (page 8) for the values that should not be exceeded:

Please let me know if there are further questions.
Thank you!

Regards,
Ashley

0 Tim K over 2 years ago in reply to Clemens Ladisch

Prodigy 20 points

Hello Clemens,

Input voltages are within the limit, even lower than the maximum allowable

When we lost VDD Opamp was still operational and works without VDD

Can you please suggest what happened when Vdd is not connected? Does the IC powered through inputs?

Best regards,

Tim

+1 Clemens Ladisch over 2 years ago in reply to Tim K

Guru 325130 points

Yes, a current flows into the input, through the clamping diode, and into VDD. This current charges the decoupling capacitor and can power up the amplifier (or any other device connected to VDD).

If the current is not limited to less than 10 mA, it can damage the device. (And if the voltage is too large, VDD might become too large.)

0 Tim K over 2 years ago in reply to Clemens Ladisch

Prodigy 20 points

Thank you Clemens

Would it continuously power device as long as current is limited and voltage less than the maximum allowable?

Tim

0 Clemens Ladisch over 2 years ago in reply to Tim K

Guru 325130 points

This depends on how much current is supplied from the source and how much current is consumed by all devices connected to VDD.

0 Tim K over 2 years ago in reply to Clemens Ladisch

Prodigy 20 points

Thanks Clemens, that resolves my concerns

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TLV2370: Missing VDD