Hi all, in order to improve the durability of the batteries I was studying the possibility to replace the 7805 with a boost converter or with a step up-step down converter. The project I'm working on uses a microprocessor 1284, lcd dispaly, a rtc, a adc 12-bit, a pressure sensor and three oxygen sensors. And I would feed the device with a maximum of 2 batteries of 3.6 V. The device is in sleep as long as you do not press a button that wakes up via interrupt the microprocessor and the display lights up. In sleep mode, the all-consuming as few mA when lit consumes about 90mA.
and the batteyhttp://www.atbatt.com/product/3443.asp
Obviously using the boost converter would use only a battery.
What do you recommend? I wish it had at least 50 hours of operation and sleep mode in a few months.