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High side switching.

J

Jim

Jan 1, 1970
0
Hi,

I have a radio module that I need to high side switch. (10mA)

Any methods I have used so far have drawn alot of current in their own right
(2mA).

Can anyone offer suggestions or tips for high side switching this module?

I was hoping to use 2uA in the switch. The unit runs from 3v supply.

It needs to be a solid state solution.

Thanks

Jim
 
F

Fritz Schlunder

Jan 1, 1970
0
Jim said:
Hi,

I have a radio module that I need to high side switch. (10mA)

Any methods I have used so far have drawn alot of current in their own right
(2mA).

Can anyone offer suggestions or tips for high side switching this module?

I was hoping to use 2uA in the switch. The unit runs from 3v supply.

It needs to be a solid state solution.

Thanks

Jim


How about using a low threshold voltage P-channel MOSFET. Sounds like the
perfect type of part to meet your requirements. Any product of a great
number would surely work, but for one possible example perhaps the IRLML6402
(Digikey carries them):

http://www.irf.com/product-info/datasheets/data/irlml6402.pdf

With this kind of voltage level and current demand you could also probably
use 74AC type logic gates or suitably beefy tiny logic parts.
 
T

Thomas C. Sefranek

Jan 1, 1970
0
Jim said:
Hi,

I have a radio module that I need to high side switch. (10mA)

Any methods I have used so far have drawn alot of current in their own right
(2mA).

Can anyone offer suggestions or tips for high side switching this module?

I was hoping to use 2uA in the switch. The unit runs from 3v supply.

It needs to be a solid state solution.

Use a PNP (2N3906) as the series switch, driven by an NPN (2N3904) to
ground.
A resistor (24K) in series with the bases is indicated. This will have a
burden of .1uA
plus the base drive for the NPN.
Thanks

Jim

--
*
| __O Thomas C. Sefranek [email protected]
|_-\<,_ Amateur Radio Operator: WA1RHP
(*)/ (*) Bicycle mobile on 145.41, 448.625 MHz

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http://www.harvardrepeater.org
 
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