Linear Technology Corporationannounces the LTC3305, a single IC, stand-alone multicell battery balancer for 12V 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. Not only does this battery transfer charge, but the energy in the transfer battery adds to the total energy in the stack, thus increasing capacity. Included on the chip is sequencing, drive circuitry for high voltage external NFETs, voltage monitoring and protection.
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The LTC3305 is designed for stand-alone operation and does not require a microprocessor or other control circuitry. With the LTC3305, one battery in the stack can be replaced and quickly balanced to the remaining batteries. The LTC3305 is suited for applications such as telecom backup systems, home battery-powered backup systems, electric vehicles and industrial lighting systems.
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The LTC3305 is offered in a thermally enhanced low profile (0.75mm) 38-lead TSSOP package. The E and I grades are specified with operating junction temperature range of -40 to 125 degrees C. Devices are available from stock and 1,000-piece pricing starts at $6.95.
source: http://www.powerpulse.net/story.php?storyID=31488
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