DS2740 High-Precision Coulomb Counter Reference Design

Abstract: The DS2740 High-Precision Coulomb Counter IC can perform the fuel gauging function for a 1-cell Lithium-ion (Li-ion) or 3-Cell NiMH battery pack.The user has a choice of whether to mount the coulomb counter IC in the battery pack or the host system. This application note presents two reference designs for using the DS2740 for the fuel gauge function; one where the DS2740 is mounted in the battery pack and one where the DS2740 is mounted in the host.Component choice and function for each circuit is described. Also the advantages for placement of the coulomb counter in each location are discussed.