LTC3305 Battery Balancer: Datasheet, Price, and Typical Application

LTC3305 Symbol

LTC3305 Footprint

LTC3305 3D Model

The LTC3305 balances up to 4 lead-acid batteriesconnected 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 are 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.

As a member of the S&P 500, Linear Technology Corporation is committed to designing, manufacturing and marketing an extensive line of high-performance analogue integrated circuits for main companies around the world. Between the analogue world and digital electronic products in communications, networks, industry, automobiles, computers, medical, instrumentation, consumer, military and aerospace systems, our products have built an important bridge for them. Our products include not only the production of power management, data conversion, signal conditioning, RF and interface ICs, μModule subsystems, but also wireless sensor network products.

Linear Technology/Analog Devices LTC3305EFE#PBF technical specifications, attributes, parameters and parts with similar specifications to Linear Technology/Analog Devices LTC3305EFE#PBF.

• Single IC Balances Up to Four 12V Lead-Acid Batteries in Series

• All NFET Design n 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

• Telecom Backup Systems

• Home Battery Powered Backup Systems 

• Industrial Electric Vehicles 

• Energy Storage Systems (ESS) 

• Medical Equipment

Typical Application for the LTC3305 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

LTC3305 Typical Application Circuit-1

LTC3305 Typical Application Circuit-2

The LTC3305 balancer is intended to be used in conjunction with a separate pre-existing battery stack charger as part of a high-performance battery system. The balancing operation itself is stand-alone and can operate independently of whether the battery stack is being charged, discharged, or both. That being said, because the LTC3305 balances voltages, it works best if the voltage readings are stable, which is more true when the battery stack is not being charged or discharged. 

Nevertheless, it will properly balance the battery voltages when the stack is being concurrently charged and/or discharged since the voltage across the batteries will average out over time as the LTC3305 repeatedly cycles through them. 

Like all balancers, the LTC3305 will slightly net-discharge the stack in the absence of a separate charger. The LTC3305 balances batteries using an auxiliary cell or an alternate storage cell as a charge reservoir. External NMOS switches are controlled in a preprogrammed sequence to connect each battery in the stack to an auxiliary cell. A charge is transferred to or from the auxiliary cell when it is connected to a battery. 

The LTC3305 can operate in one of two modes programmable via the MODE pin.

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.