BQ76952 3- to 16-Series Battery Monitors and Protectors for Li-Ion, Li-Polymer, and LiFePO4 battery packs

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

Texas 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)

more information: https://www.ti.com/product/BQ76952

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