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ahmed osama
Joined: 18 Jul 2004
Posts: 258
Helped: 1
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 15 Jul 2006 9:08 Need voltage regulator min o/p current less than 10 uA |
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hi all
i need a low current voltage regulator
i need one with these spuc. i/p V : 9 - 5 Vdc
o/p V : 1.3 Vdc
Load current about 10 uA (must regulate at such current) (min o/p current less than 10 uA)
indeed i used to use a famous one LM317 but it's min o/p current more than 10 mA !!!! if the current less than that the voltage get rise and no regulation
thx all
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IanP
Joined: 05 Oct 2004
Posts: 6361
Helped: 1509
Location: West Coast
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VVV
Joined: 26 Nov 2004
Posts: 1517
Helped: 281
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| 17 Jul 2006 3:41 Re: Need voltage regulator min o/p current less than 10 uA |
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If your power requirements are not too stringent, you can still use the LM317. Just make sure you have a "bleeder" resistor at the output, which can draw the 10mA that the LM317 requires. The output divider will also help typically 5mA (1.25V/240 ohm). That way the load can draw any current, down to 10uA.
Not an elegant solution, but an immediate one.
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ahmed osama
Joined: 18 Jul 2004
Posts: 258
Helped: 1
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| 17 Jul 2006 8:56 Re: Need voltage regulator min o/p current less than 10 uA |
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| VVV wrote: |
If your power requirements are not too stringent, you can still use the LM317. Just make sure you have a "bleeder" resistor at the output, which can draw the 10mA that the LM317 requires. The output divider will also help typically 5mA (1.25V/240 ohm). That way the load can draw any current, down to 10uA.
Not an elegant solution, but an immediate one. |
this idea came ofcourse to my mind , i even said i can put a led to consume such 10 mA but another problem came to me , the o/p voltage is 1.3 & the led need at least 2 volt !!!!!!!!
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IanP
Joined: 05 Oct 2004
Posts: 6361
Helped: 1509
Location: West Coast
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| 17 Jul 2006 9:09 Re: Need voltage regulator min o/p current less than 10 uA |
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Why can't you connect a 130Ω resistor as suggested by VVV ?
Regards,
IanP
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ahmed osama
Joined: 18 Jul 2004
Posts: 258
Helped: 1
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| 17 Jul 2006 9:14 Re: Need voltage regulator min o/p current less than 10 uA |
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| IanP wrote: |
Why can't you connect a 130Ω resistor as suggested by VVV ?
Regards,
IanP |
i don't want to consume 10 mA in nothing in just a resistor !!!!
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IanP
Joined: 05 Oct 2004
Posts: 6361
Helped: 1509
Location: West Coast
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| 17 Jul 2006 12:04 Re: Need voltage regulator min o/p current less than 10 uA |
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Then you will have to go for low quiescent current voltage regulators; there is no other altrnative to come close to 10ľA of no-load current ..
Regards,
IanP
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on1aag
Joined: 30 Jun 2006
Posts: 155
Helped: 36
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| 17 Jul 2006 19:37 Re: Need voltage regulator min o/p current less than 10 uA |
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HI,
Use a micropower reference as a shunt regulator.
20 ľA for the reference and 10 ľA for the load.
on1aag
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luc2002
Joined: 04 Jun 2002
Posts: 35
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| 07 Dec 2006 7:02 Re: Need voltage regulator min o/p current less than 10 uA |
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TPS71533, 50-mA, 3.3-V High Input-Voltage LDO Voltage Regulator in SC-70
Low 3.2-ľA Quiescent Current at 50 mA
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