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Semiprecise low voltage low current voltage reference

Hi

I need a voltage reference with the following specs:

Vin = 900mV to 5V Vref = anywhere from 100mV to 900mV, but must be fixed value (max 10% tolerance). So if the reference is 500mV, min/max is 450mV/550mV Reference current = max 10uA

The normal two transistor bandgap with temperature compensation has a nominal value of 1150mV, which is too high since then we need more than 1150mV to operate it.

Been playing with a resistor fed forward biased diode to yield say

300mV. But tempco is 2mV/K, initial tolerance in the range of +/- 25mV due to production spread, combined with no way to provide accurate current for the diode means that this is not a feasable way forward

Googling commercial ICs got me nowhere, minimum 1.2V reference at this low drive current :-(

Anyone got an idea?

Thanks

Klaus

Reply to
Klaus Kragelund
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There are single-chip options.. eg. LT3008.. or NCP585 (cheaper).

Best regards, Spehro Pefhany

--
"it's the network..."                          "The Journey is the reward"
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Reply to
Spehro Pefhany

And the LM10 might work. It works with a supply voltage down to 1.1V, and includes a 200mV voltage reference. It isn't all that cheap, though the cheaper - 7V max supply voltage - LM10CL sounds as if it would do.

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Bill Sloman, Nijmegen
Reply to
Bill Sloman

A schottky diode bandgap? Two grounded diodes, run at different currents, and measure the difference, or something like the difference, that gives zero TC.

Of course, there might be details...

John

Reply to
John Larkin

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