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Very low supply current & Low offset AMP

Question asked by donadona999s on Dec 8, 2016
Latest reply on Jan 16, 2017 by donadona999s

Hi !


Our customer want to detect Over Current at their system.

Their system is 12V Li-ION BATTERY for automotive.

This is the circuit.

There are some difficult points.

1)

Their target supply current is less than 100uA.

2)

The AMP gain will be very high because the shunt-R is very small.

So they think the input offset will be very important for this system.

They said that target input offset will be less than 90uV.

 

I am proposing AD8418A and other OP-AMP + ADCMP361 for this system.

But it can not meet their requirement.

 

So can you give me some advise about this?

My question is,

(Q1)

Do you  have any idea to detect OC(6A±4A) at this system?

But also you have to make very low supply current.

 

Best regards

Kawa

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