| Electronics > Beginners |
| Voltage regulator recommendations |
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| newbie666:
Hello, I need to generate following voltages for a chip: +7V@10uA (max) -7V@10uA (max) +5V@5uA (max) from +-15V supplies I only have experience with lm317/337 and I was thinking about using them at first, but it seems like a terrible waste of power considering that minimum current at which lm317 starts to regulate is around 10mA if I remember correctly. Can you recommend me a micropower linear voltage regulator that would take this relatively high input voltage (15V). Would be nice if it came in the package that is possible to hand-solder. Thanks! |
| james_s:
How accurate do those voltages need to be? I think I would look at using a zener diode or if you want something more precise try a reference like the TL431. There are lots of precision low power voltage references available intended for things like DAC references. |
| newbie666:
5V supply is for powering digital part of the chip so doesn't have to be accurate (datasheet specifies 4.5-5.5V) +-7V supplies for analog part can be in a wide range of 4.5-7V actually, but I'd like them to be as close to 7V as possible (for headroom) AND symmetric as this will determine dc offset at the output. I'm going to look into zener diode regulation, in the meantime if you have any other suggestions shoot :) |
| oPossum:
Maybe a voltage divider from the +/- 15V rails buffered by a (quad) op-amp or emitter follower. Is this for audio switching using CMOS switches like 4066, 4051, 4052, 4053? |
| newbie666:
hmmm, quad opamp + a voltage reference may be a great idea. I'll get the parts and try it on the breadboard. |
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