LTC3305 – Lead Acid Battery Balancer


  • Single IC Balances Up to Four 12V Lead-Acid Batteries in Series
  • All NFET Design
  • Stackable to Balance Larger Series Battery Packs
  • Standalone Balancing Operation: Requires No
  • External μP or Additional Control Circuitry
  • Balancing Current Limited by External PTC Thermistor
  • Continuous Mode and Timer Mode
  • Programmable UV and OV Fault Thresholds
  • Programmable Termination Time and Termination Voltage
  • Thermally Enhanced 38-Lead TSSOP Package
  • Click here to read “Life Extension Through Charge Equalization of Lead-Acid Batteries” on IEEE Xplore


The LTC®3305 balances up to 4 lead-acid batteries connected in series. It is intended to be used in conjunction with a separate pre-existing battery charger as part of a high performance battery system. All voltage monitoring, gate drive, and fault detection circuitry is integrated.

LTC3305 - Lead Acid Battery Balancer

The LTC3305 employs an auxiliary battery or an alternative storage cell to transfer charge to or from each individual battery in the stack. A mode pin provides two operating modes, timer mode and continuous mode. In timer mode, once the balancing operation is completed, the LTC3305 goes into a low power state for a programmed time and then periodically rebalances the batteries. In continuous mode, the balancing operation continues even after the batteries are balanced to their programmed termination voltage.

The LTC3305 is available in a thermally enhanced 38-lead TSSOP package.


  • Telecom Backup Systems
  • Home Battery Powered Backup Systems
  • Industrial Electric Vehicles
  • Energy Storage Systems (ESS)
  • Medical Equipment

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