TLV4112: What's about VIN>VCC?

Phil Yi40

Part Number: TLV4112

Hi, op-amp experts:

We need to use the op-amp to make sure VIO_IN<VCCA as showing by circuit below; MCUVCC=3.3V, VCCA range is from 2.8V to 5.5V. What's about VCCA<3.3V which makes the op-amp VIN > VCCA? is there a input protection? if not, there is a risk to burn the op-amp, right?

over 5 years ago

0 Marek Lis over 5 years ago

TI__Guru 60570 points

Phil,
Since you have R35 1.8k resistor between the MCUVCC and VCCA, with Vin being at most 3.3-2.8V=0.5V above VCCA, the max input current is 278uA, which can be easily handled by the ESD protection diode between the Vinp and VCCA. Thus, there is no danger of damaging the part.

0 Phil Yi40 over 5 years ago in reply to Marek Lis

TI__Mastermind 33130 points

It's exact the answer I need to make sure there is an ESD diode from input pin to its power pin.

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TLV4112: What's about VIN>VCC?