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Infineon Technologies TLE9018DQK Li-ion Battery Monitoring Balancing IC

Infineon TLE9018DQK Li-ion Battery Monitoring and Balancing IC monitors the temperature of a battery system and the voltage of each cell to ensure the function and safety of the vehicle occupants. The IC meets AEC-Q100, is ISO 26262 compliant up to ASIL D, and RoHS compliant. It monitors up to 18 battery cells in a connected series with a robust 120V automotive technology and features a dedicated 16-bit delta-sigma ADC for each battery cell. SoC and SoH are measured with high accuracy and include an integrated stress sensor.

Safety measures for the Infineon TLE9018DQK include automatic balancing, automatic open load detection, and automatic NTC measurement. The IC also includes end-to-end CRC-secured iso UART/UART communication, CRC-secured configuration registers, and an emergency mode for communication.

Features

  • Voltage monitoring of up to 18 battery cells connected in series
  • Robust 120V automotive technology
  • Hot-plugging without external protection
  • Dedicated 16-bit delta-sigma ADC for each battery cell
  • High-accuracy measurement for SoC and SoH calculation
  • Integrated stress sensor
  • Secondary ADC with an advanced end-to-end safety mechanism, averaging filter characteristics
  • Eight temperature measurement channels for external NTCs
  • Internal temperature measurement and monitoring
  • Integrated balancing switch allowing up to 300mA balancing current per cell simultaneously
  • Galvanically isolated serial interface for daisy chain and ring mode communication
  • Supports capacitive coupling and transformer coupling
  • Differential robust serial 3Mbit/s communication interface
  • SPI master interface
  • Several wake sources

Applications

  • Multi-cell battery monitoring and balancing systems
  • Li-ion battery packs used in hybrid electric vehicles (HEV)
  • Plug-in hybrid electric vehicles (PHEV)
  • Battery electric vehicles (BEV)
  • 12V Li-ion batteries
  • Energy storage systems

Safety

  • Internal round robin cycle routine to trigger safety mechanisms
    • Automatic balancing overcurrent and undercurrent detection scheme
    • Automatic open load detection scheme
    • Automatic NTC measurement unit monitoring scheme
  • End-to-end CRC-secured iso UART/UART communication
  • CRC-secured configuration registers
  • Emergency mode for communication

Specifications

  • 300mA max balancing current
  • 10V cell voltage max
  • 3MBit communication speed
  • 4kV ESD protection
  • 6V to 90V functional range
  • 2 ISO UART Interfaces
  • Isolated UART communication interface
  • UART non-isolated communication interface
  • 4µA Standby Current
  • 8 temperature measurement channels
  • 150°C Tj max
  • 120V voltage class
  • 18 voltage measurement channels

Additional Resources

Pin Assignment

Schematic - Infineon Technologies TLE9018DQK Li-ion Battery Monitoring Balancing IC

Package Information

Mechanical Drawing - Infineon Technologies TLE9018DQK Li-ion Battery Monitoring Balancing IC
Publicerad: 2025-09-30 | Uppdaterad: 2025-10-15