![]() (I look long ago for simular problem as unstable 12 Volt car-batterys (6.5 Volt with start engine to near 16 Volt charging voltage in cold weather) to stable 12 Volt for example feed computers and harddisk. Is hard but possible to find few app-notes to bulid switches can work both in buck and boost mode depend if input voltage is higher or lower compare to output voltage - look on Maxim, Linear technology, National semiconductor etc. Or design your equipment for 3.3 Volt logic.įor more easy design - use 6 cell battery pack and make buck switcher power supply can handle from 9.6 Volt (fresh alkaline batterys) to 5.4 Volt (empty battery as 0.9 Volt/cell) and also make possible to use NiMh-batteries. If the voltage at the LBI pin drops below the internal threshold typ. (if you want high power and high quality loadspeakers/ear-phone drivers without clipping in high level - you want more than 5 Volt to feed this drivers.) Other way, use boost switcher to make 8-10 Volt from batterys 3.6 - 6.4 Volt and next step using buck switcher to make wanted 5.0 Volt. ![]() or you in same situation as old digital camera needs new batterys in short time and 'used' replaced battery have more than half capacity remains + user cannot use NiMH-batterys in your power hungry equipment (1.2 V/cell * 4 = 4.8 Volt). if remember rigth standard 'emty' dry/akaline battery is 0.9 Volt/cell -> 3.6 Volt for 4 cell-pack.įor 5 Volt logic-supply You need switched voltage converter going in buck-mode with fresh battery and smothly going to boost mode with half to empty batterys.
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