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LTC3300-2 - Addressable High Efficiency Bidirectional Multicell Battery Balancer

The LTC®3300-2 is a fault-protected controller IC for transformer-based bidirectional active balancing of multicell battery stacks. All associated gate drive circuitry, precision current sensing, fault detection circuitry and a robust serial interface with built-in watchdog timer are integrated.

Each LTC3300-2 can balance up to 6 series-connected battery cells with an input common mode voltage up to 36V. Charge from any selected cell can be transferred at high efficiency to or from 12 or more adjacent cells. Each LTC3300-2 has an individually addressable serial interface, allowing up to 32 LTC3300-2 devices to interface to one control processor.

Fault protection features include readback capability, cyclic redundancy check (CRC) error detection, maximum on-time volt-second clamps, and overvoltage shutoffs.

The related LTC3300-1 offers a serial interface that allows the serial ports of multiple LTC3300-1 devices to be daisychained without opto-couplers or isolators.

Features Bidirectional Synchronous Flyback Balancing of Up to 6 Li-Ion or LiFePO4 Cells in Series Up to 10A Balancing Current (Set by Externals) Integrates Seamlessly with the LTC680x Family of Multicell Battery Stack Monitors Bidirectional Architecture Minimizes Balancing Time and Power Dissipation Up to 92% Charge Transfer Efficiency Stackable Architecture Enables >800V Systems Uses Simple 2-Winding Transformers 1MHz Serial Interface with 4-Bit CRC Packet Error Checking Individually Addressable with 5-Bit Address Numerous Fault Protection Features 48-Lead Exposed Pad QFN and LQFP Packages Typical Application

Applications Electric Vehicles/Plug-in HEVs High Power UPS/Grid Energy Storage Systems General Purpose Multicell Battery Stacks Packaging