I'm looking for a switching device to be used for powering a sub-circuit in a battery powered low / ultra-low power circuit.
The sleep mode power consumption of the circuit, without the above sub-circuit + switching device, will be in the range of 25-50nA @3.3V.
The ON current for the sub-circuit is expected to be ~25-50μA, with occasional spikes of at most 10-20mA.
Because the above currents are very small, I think we need a low power switching device with very small leakage currents. This way the sub-circuit should not gets accidentally powered and the power consumption in sleep mode is kept at minimum.
As far as now, I looked at following options:
- Vishay, Si1499DH - MOSFET, source-drain leakage current 1μA/10μA, gate leakage current 100nA
- Texas Instruments, CSD23280F3 - MOSFET, source-drain leakage current 50nA, gate leakage current 25nA
- load switches
- Texas Instruments, PS22860 - load switch, leakage current 10 + 2 nA
- Vishay, SiP32431/2 - load switch, leakage current 0.001nA, with 100nA max @3.3V (note: found this after posting the question, and looks to be good enough)
- some JFET-s, but I'm not sure if they could be used / are suitable for such an application
Now, may there may be a lot of devices / solutions I'm not aware of. What do you think are the most suitable devices or solutions for such a problem?