At 07:48 a.m. 02/12/02 -0800, you wrote:
As your output cannot drive the current you need, you will only be able toHello Friedel,The circuit does not have to be fast, I want to use it as a powersupply, delivering 1.8V, 3.3V or 5V with a current of 200mA (cont.), and a current limit at 250mA. Voltage depends on the connected application. The chip I want to use can switch between the 3 voltages, but can source 60mA max., which is to less for my application.
use it as a reference voltage for some other device which can drive the current,
so what is your primary source, as Declan sais, how much overhead you have,
from there you can take the choice what circuit or element to use, if you have
little overhead, may not be able to use a LM317, which needs about 2V, the
LM2931CT needs less, the is a long list of low to ultra low drop-out voltage
regulators you may check.
Cheers
Friedel
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Author: Friedel Bruening
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