LMP7731, LMP7732 input bias current and CM range

Mark Stern

Intellectual 285 points

Other Parts Discussed in Thread: LMP7731, LMP7732

Hello,

The LMP7731, LMP7732 data sheets show the input bias current off the graph as the CM approaches the rails.

With a 5V supply:

1 - Is it safe to run the CM to the rails over temperature?

2 - What would be the expected bias current, at the rails, over temperature?

Thanks,

Mark

over 8 years ago

0 Paul Grohe over 8 years ago

TI__Guru 53246 points

HI Mark,

1. Yes. But pay attention to the Offset Voltage vs Vcm vs temperature graphs in the datasheet. The point the offset shifts near the rails will vary with temperature.

2. The graphs cuts off, but looking at char data, the currents can be as high as ±9uA at the rails at +125°C. These are dual stage bipolar input devices, so there is real base current.

Regards,

0 Mark Stern over 8 years ago in reply to Paul Grohe

Intellectual 285 points

Thanks.

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LMP7731, LMP7732 input bias current and CM range