Analog Devices Inc. HEV/EV LTC3300 Multicell Battery Balancers

Analog Devices Inc. HEV/EV LTC3300 Bidirectional Multicell Battery Balancers are a fault-protected controller IC for transformer-based bidirectional active balancing of multicell battery stacks. The LTC3300 integrates all associated gate drive circuitry, precision current sensing, fault detection circuitry, and a robust serial interface with a built-in watchdog timer.

The LTC3300 can balance up to 6 series-connected battery cells each 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. A unique level-shifting SPI-compatible serial interface enables multiple LTC3300-1 devices to be connected in series, without optocouplers or isolators, allowing for balancing of every cell in a long string of series-connected batteries. The LTC3300-2 has an individually addressable serial interface, admitting up to 32 LTC3300-2 devices to interface to one control processor.

The LTC3300 Bidirectional Multicell Battery Balancers offer fault protection features that include readback capability, cyclic redundancy check (CRC) error detection, maximum on-time volt-second clamps, and overvoltage shutoffs.


  • 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 >1000V Systems
  • Uses Simple 2-Winding Transformers
  • 1MHz Daisy-Chainable Serial Interface with 4-Bit CRC Packet Error Checking
  • High Noise Margin Serial Communication
  • Numerous Fault Protection Features
  • 48-Lead Exposed Pad QFN and LQFP Packages
  • AEC-Q100 Qualified for Automotive Applications


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

Typical Application

Application Circuit Diagram - Analog Devices Inc. HEV/EV LTC3300 Multicell Battery Balancers
Published: 2019-10-21 | Updated: 2022-03-10