This Design Note presents four circuits capable of solving the dilemma of converting three cells to 3.3V. The LT1303 and LT1372 high efficiency DC/DC converters are used in the examples given.
micropower buck/boost circuits
converting three cells to 3.3V
Two combinations of cell count and output voltage are to be strictly avoided: three cells converted to 3.3V and four cells converted to 5V. These combinations are troublesome because no ordinary regulator (boost, buck or linear) can accommodate a situation where the input voltage range overlaps the desired output voltage.
This design note presents four circuits capable ...