Summary of LTC3305 – Lead Acid Battery Balancer
The LTC3305 is a standalone integrated circuit designed to balance up to four 12V lead-acid batteries in series without external microprocessors. It features an all-N-FET design, supports stackable configurations for larger packs, and offers programmable fault thresholds and termination settings. The device operates in either continuous or timer modes and utilizes an auxiliary battery for charge transfer within a thermally enhanced 38-lead TSSOP package.
Parts used in the LTC3305 Project:
- LTC3305 Integrated Circuit
- Up to Four 12V Lead Acid Batteries
- All N-FET Design Components
- External PTC Thermistor
- Auxiliary Battery or Alternative Storage Cell
- Mode Pin
- 38-Lead TSSOP Package
Features
- Single IC Balances up to Four 12V Lead Acid Batteries in Series
- All N-FET Design
- Stackable to Balance Larger Series Battery Packs
- Stand Alone Operation Requires no External μP or 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
Description
The LTC®3305 balances up to 4 lead acid batteries connected in series. All voltage monitoring, gate drive, and fault detection circuitry is integrated. The LTC3305 is designed for stand-alone operation and does not require any external control circuitry.
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 detail: LTC3305 – Lead Acid Battery Balancer
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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, the device is designed for stand-alone operation and requires no external μP or control circuitry. -
What are the two operating modes available?
The device offers Timer Mode and Continuous Mode selectable via a mode pin. -
How is the balancing current limited?
The balancing current is limited by an external PTC thermistor. -
Can this chip be used for larger battery packs?
Yes, the chips are stackable to balance larger series battery packs. -
What happens in Timer Mode after balancing is completed?
In Timer Mode, the device enters a low power state for a programmed time before periodically rebalancing. -
Is the device available in a standard or thermally enhanced package?
The LTC3305 is available in a thermally enhanced 38-lead TSSOP package.
