Low power linear voltage regulator
Low power linear voltage regulator
(OP)
Hi all,
I am looking from a very low power voltage regulator. The maximum input voltage is 13.2V and the supply current is about 250mA. I found a voltage regulator from Microchip (TC55) that is really nice because its quiescent current is only 1 uA, but the maximum input voltage is too low (about 10V).
Does anyone know a voltage regulator that meets this requirement? I was thinking about have a zener diode in series with the input line, but I don't know if the zener will work at that current level.
Thanks,
Fabioedl
I am looking from a very low power voltage regulator. The maximum input voltage is 13.2V and the supply current is about 250mA. I found a voltage regulator from Microchip (TC55) that is really nice because its quiescent current is only 1 uA, but the maximum input voltage is too low (about 10V).
Does anyone know a voltage regulator that meets this requirement? I was thinking about have a zener diode in series with the input line, but I don't know if the zener will work at that current level.
Thanks,
Fabioedl





RE: Low power linear voltage regulator
RE: Low power linear voltage regulator
The Maxim MAX1615 has 8uA quiscent, 4-28 Vin, but is 30mA max out. The Seiko S-812C series is 1uA, 16Vin max, but is 50 to 75mA max out.
RE: Low power linear voltage regulator
RE: Low power linear voltage regulator
That is, one resistor from output to the GND pin and another from the GND pin to actual GND.
I have seen it done with LM309 years back.
(10 V (I think) out instead of 5V)
There may be draw-backs, however.
Reduced stability and/or ripple reduction etc. (I don't really know
With the above coupling, you may avoid having to reduce the input voltage to 12V, but on the other hand, it could be a good (safe) idea to do it anyway.
RE: Low power linear voltage regulator
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Do it right, or don't do it at all.
RE: Low power linear voltage regulator
felixc, the LP2989 has a quiescent current of 110uA. Way too much for my application. Thanks anyway.
I think I found another solution. I am going to use a depletion mode FET. I will connect the source to the input pin of TC55, the gate to the output and the input voltage to the FET's drain. By doing that, I will regulate the TC55' input voltage to the output voltage plus the threshold voltage of the depletion mode FET. This will create a voltage drop accross the FET.
One of our engineers showed a circuit that uses this circuit. I think it will work, but I will breadboard this and let you guys know.
Thanks anyway.
Fabioedl