TLV1805: absolute max voltage of output pin

XIANSONG LU

Prodigy 20 points

Part Number: TLV1805

Hi teams,

Refer to TLV1805 datasheet below ,

does it mean that the absolute max voltage of output pin relies on supply voltage.

For example, If ±12V is supplied for AMP, the voltage range that output pin coud withstand is -12.3V ~ 12.3V.

10 months ago

0 Clemens Ladisch 10 months ago

Guru 243220 points

Yes; there is a diode from the pin to V+. See [FAQ] Can the input voltage (Vi) to my logic device be higher than the supply voltage (Vcc)?

0 Paul Grohe 10 months ago

TI__Mastermind 49906 points

Again, thanks again Clemens!

Hello Xiansong,

Normally the output should not exceed the supplies. Normally you do not force current back into the output.

However, inductive loads or long traces can cause inductive kick-back or ringing that may push the output beyond the supplies. There are ESD didoes on the output to the supplies that should clamp the output, and the output limit spec is for these diodes.

0 XIANSONG LU 10 months ago in reply to Paul Grohe

Prodigy 20 points

Hi Paul,

Thanks for your reply.
Based your reply and the datasheet, I think 0.3V is the litmit voltage spec for the ESD diode.
Normally a VF of diode is defined based on IF, besides for voltage limit spec as 0.3V, is there any information on the current limit spec for the ESD diode or output pin.

0 Paul Grohe 10 months ago in reply to XIANSONG LU

TI__Mastermind 49906 points

Hello Xiansong,

The 0.3V limit keeps the diode from fully conducting so that the input bias current is still within spec.

As for current, we recommend keeping the ESD diode current below 10mA (similar to the input) or as low as possible.

If there are chances of exceeding the supply, then external clamps are recommended.

Amplifiers

Amplifiers forum

TLV1805: absolute max voltage of output pin