Rohm Semiconductor developed extremely low power DC/DC boost converter "BU33UV7NUX" targeting the applications like small portable devices, gadget, remote, and so on.
It especially works good with the product using dry cell batteries and it can output 3.3V from the 1 to 2 dry cell batteries (1-3V).
The current consumption is just about 7uA!
The Japanese press release says that they can improve the battery life 175 days more compared with other conventional parts when using a remote with 2 batteries as stand-by more.
Assuming 50 uA load current of the stand-by mode, it can improve the battery life from 540 days to 715 days!
Well, in a practical sense, the remote is used more often and it is not always stand-by mode, however, 175 days (1.3 times) is quite interesting.
It can also support low and high power mode that can achieve maximum efficiency of 94% in the wide variety of conditions.
Low power: Maximum load current 50mA, Power consumption 7uA, PFM control
High power: Maximum load current 500mA, Power consumption 13uA, PFM/PWM control
The evaluation board "BU33UV7NUX-EVK-101" is available through distributors.
This could be a good candidate for the dry cell battery operated BLE devices like tracking, sensing, and others!