[time-nuts] Low Drop Out Voltage Regulator
Dr Bruce Griffiths
bruce.griffiths at xtra.co.nz
Thu Mar 8 23:59:05 EST 2007
Dr Bruce Griffiths wrote:
> Brian Kirby wrote:
>> Can anybody recommend a low drop out voltage regulator that will work
>> with a 2 volt input differential, and a output of 22 volts at 2 amps ?
>> What I have in mind is a 28 volt DC power supply, and 24 volt batteries,
>> and a rubidium oscillator that will run at 22 volts.
>> Brian N4FMN
>> time-nuts mailing list
>> time-nuts at febo.com
> An LT1083 would be OK except that its maximum input output voltage is
> 30V a little too close for comfort given that the battery output may
> exceed this, the obsolete LT1083M with a 35V rating would have been OK.
> The maximum input output voltage occurs when charging the output
> capacitor on startup or with a short circuit load.
> time-nuts mailing list
> time-nuts at febo.com
I should have said LT1083/4/5 series.
You may well have to build a regulator using an LM723, low dopout
designs are possible with pnp or MOSFET pass transistors.
The voltage rating for the 723 is more than adequate. The bonus is that
these regulators have lower output voltage noise than any 3 terminal low
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