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Low-power MCU to 12 VDC Latching Relay Switch

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Hi,

I'm struggling with a dilemma of how to switch a 12 VDC single coil latching relay from a very low power RF MCU (TI CC26xx family) which operates on 3VDC.

The relay coil only requires 5 milliseconds at 16 milliamperes to latch/switch, and it's critical to minimize current drain as this is all powered from RF power harvesting with no batteries (capacitors only). I have already proven the 470 uF cap can switch the relay 4 to 5 times on a single charge, so that's no issue.

The...

Low-power MCU to 12 VDC Latching Relay Switch

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