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REF3450: Single-Output Current Reference without buffer amp

Part Number: REF3450

Hi,

Now I'm referring the reference circuit Fig 2 in page 22 of following document that configure current reference with voltage reference IC, FET and buffer amp.

http://www.ti.com/lit/ml/slyc147/slyc147.pdf

But now I'm considering to configure current reference with REF3450 and FET, no buffer amp as attached. Do you think any concern for this configuration?

Best Regards,

Satoshi / Japan Disty