STM32WB LI-Ion battery-powered design for most effective power consumption

[Neboron]

Hello, community!

I need to design a device that can work from a single-cell Li-Ion battery (~500mAh) of at least 1.5 years. STM32WB55 has SMPS which can increase consumption efficiency, the maximum input voltage for SMPS is 3.6V but the battery voltage range equal to 3-4.2V, so I can't directly connect the Li-Ion cell to STM32.

So what method will be more preferable for supplying STM32, maybe external LDO or a few diodes in series to decrease input voltage or other method?

Most of the time device is working only with active BLE and waiting for the command which sets one of the pins in the high state and enables all other onboard electronics.

[Vangelis Fortounas]

Hello

A buck-boost converter with low Qcurrent is a fair solution.

This consumes 13 microamps in operating state.

13 microamps *2 years is about 220mAh and is less than20% of a single Li Ion 2500mAh battery.

[Neboron]

Thanks! I think it's a good variant for me.