AA rechargeable battery

　　Industry Technical Knowledge Tips: Factors in AA rechargeable batteryManagement System Design

　　AA rechargeable batterychemistry

　　Each AA rechargeable batterychemistry has different operating characteristics, such as discharge patterns and self-discharge rates. TI's AA rechargeable batteryfuel gauge ICs are developed based on AA rechargeable batterychemistry to compensate for these differences to accurately display the remaining energy in the battery. Furthermore, each AA rechargeable batterychemistry has unique requirements for its charging algorithm, which is critical to maximizing its capacity, extending AA rechargeable batterylife, and improving safety.

　　Charging Control Topology

　　The simple linear topology is ideal for low-power AA rechargeable batterypack applications with charging currents less than 1A (e.g., single or two-cell lithium-ion batteries). The switch-mode topology is ideal for fast charging via USB ports or for large AA rechargeable batterypacks that require charge rates greater than 1A. Switch-mode conversion minimizes heat generated during charging. Wireless power topologies use shared magnetic fields to provide the benefits of contactless power transfer. Wireless charging provides an additional AA rechargeable batterycharging option for portable devices and can also serve as an alternative to other 5V charging sources.

　　Input voltage

　　The IC's wide input voltage range and input overvoltage protection provide maximum safety while allowing the use of low-cost, unregulated wall adapters.

　　Number of cells in series - A AA rechargeable batterypack consists of a series of cells connected in series and in parallel. Protection against overcharge, overdischarge and short circuit conditions must be provided for each series cell or parallel AA rechargeable batterypack.

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