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BQ76952 3- to 16-Series Battery Monitors and Protectors

Author: EIS Release Date: Mar 22, 2021

Texas Instruments' high-accuracy protector is designed for Li-Ion, Li-Polymer, and LiFePO4 battery packs

Image of Texas Instruments' BQ76952 High-Accuracy Battery MonitorTexas Instruments' BQ76952 device is a highly integrated, high-accuracy battery monitor and protector for 3-series to 16-series Li-Ion, Li-Polymer, and LiFePO4 battery packs. The device includes a high-accuracy monitoring system, a highly configurable protection subsystem, and support for autonomous or host-controlled cell balancing. Integration includes high-side charge-pump NFET drivers, dual-programmable LDOs for external system use, and a host communication peripheral supporting 400 kHz I2C, SPI, and HDQ one-wire standards. The BQ76952 device is available in a 48-pin TQFP package.

Features
  • Battery monitoring capability for 3-series to 16-series cells
  • Integrated charge pump for high-side NFET protection with optional autonomous recovery
  • Extensive protection suite including voltage, temperature, current, and internal diagnostics
  • Two independent ADCs:
    • Supports simultaneous current and voltage sampling
    • High-accuracy coulomb counter with input offset error <1 µV (typ.)
    • High-accuracy cell voltage measurement <10 mV (typ.)
  • Wide-range current applications (±200 mV measurement range across the sense resistor)
  • Integrated secondary chemical fuse drive protection
  • Autonomous or host-controlled cell balancing
  • Multiple power modes (typical battery pack operating range conditions):
    • NORMAL mode: 286 µA
    • Multiple SLEEP mode options: 24 µA to 41 µA
    • Multiple DEEPSLEEP mode options: 9 µA to 10 µA
    • SHUTDOWN mode: 1 µA
  • High voltage tolerance of 85 V on cell connect and select additional pins
  • Tolerant of random cell attach sequence on the production line
  • Supports temperature sensing using an internal sensor and up to nine external thermistors
  • Integrated one-time-programmable (OTP) memory programmable by customers on the production line
  • Communication options: 400 kHz I2C, SPI, and HDQ one-wire interface
  • Dual-programmable LDOs for external system usage
  • Package: 48-pin TQFP (PFB)
Applications
  • Battery backup units (BBU)
  • E-bikes, e-scooters, and LEV
  • Cordless power tools and garden tools
  • Non-military drones
  • Other industrial battery packs (≥10S)
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