Summary of LTC3305 – Lead Acid Battery Balancer
The LTC3305 is a single IC designed to balance up to four 12V lead-acid batteries in series. It features an all-NFET design, stackable architecture for larger packs, and standalone operation without external microcontrollers. The device supports continuous and timer modes, includes programmable fault thresholds, and utilizes a PTC thermistor for current limiting within a 38-lead TSSOP package.
Parts used in the LTC3305 Battery Balancing Project:
- LTC3305 IC
- External PTC Thermistor
- Separate Pre-existing Battery Charger
- Auxiliary Battery or Alternative Storage Cell
- Up to Four 12V Lead-Acid Batteries
Features
- 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
Description
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.
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.
Applications
- Telecom Backup Systems
- Home Battery Powered Backup Systems
- Industrial Electric Vehicles
- Energy Storage Systems (ESS)
- Medical Equipment
For More Details: LTC3305 – Lead Acid Battery Balancer
- How many batteries can the LTC3305 balance?
The LTC3305 balances up to four 12V lead-acid batteries connected in series. - Does the LTC3305 require an external microprocessor?
No, it operates standalone and requires no external μP or additional control circuitry. - What are the two operating modes available?
The device offers Timer Mode and Continuous Mode. - Can this chip be used for larger battery packs?
Yes, the units are stackable to balance larger series battery packs. - How is the balancing current limited?
The balancing current is limited by an external PTC thermistor. - What type of package does the LTC3305 use?
It is available in a thermally enhanced 38-lead TSSOP package. - What components transfer charge to or from individual batteries?
An auxiliary battery or alternative storage cell is employed to transfer charge. - Are fault thresholds programmable?
Yes, UV and OV fault thresholds, termination time, and termination voltage are programmable.
