The LTC3305 is a single-IC, stand-alone multicell battery balancer for 12-V lead-acid batteries. Balancing works by absorbing charge from higher-voltage batteries and transferring that charge to lower-voltage batteries so that all are charged equally. Charge is transferred using a lower-capacity battery that is sequentially connected across the batteries in the stack. The chip includes sequencing, drive circuitry for high-voltage external NFETs, voltage monitoring, and protection.
The battery balancer IC is designed for stand-alone operation and does not require a microprocessor or other control circuitry. The IC suits applications such as telecom backup systems, home battery-powered backup systems, electric vehicles, and industrial lighting systems. It employs an auxiliary battery storage cell to transfer charge to or from each individual battery in the stack. Additional devices can be stacked to balance higher-voltage series battery packs.
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