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Texas Instruments bq76972 High-Accuracy Battery Monitor

Texas Instruments bq76972 High-Accuracy Battery Monitor 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 400kHz I²C, SPI, and HDQ one-wire standards. The Texas Instruments bq76972 device is available in a 48-pin TQFP package.

Features

Battery monitoring capability for 3-series to 16-series cells
High accuracy cell voltage measurement of ±3.0mV
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
- Support for simultaneous current and voltage sampling
- High-accuracy coulomb counter with input offset error < 1µV (typical)
Multiple power modes (for typical battery pack operating range conditions)
- NORMAL mode: 286µA
- Multiple SLEEP mode options: 24µA to 41µA
- Multiple DEEPSLEEP mode options: 9µA to 10µA
- SHUTDOWN mode: 1µA

Wide-range current applications (±200mV measurement range across sense resistor)
Integrated secondary chemical fuse drive protection
Autonomous or host-controlled cell balancing
High-voltage tolerance of 85V on cell connect and select additional pins
Tolerant of random cell attach sequence on the production line
Support for 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 include 400kHz I2C, SPI, and HDQ one-wire interface
Dual-programmable LDOs for external system usage
48-pin TQFP package (PFB)

Applications

Energy storage systems
Battery backup unit (BBU)
E-bike, e-scooter, and LEV

Cordless power tools and garden tools
Non-military drones
Other industrial battery pack (≥ 10 series)

Texas Instruments bq76972 High-Accuracy Battery Monitor

Features

Applications

Functional Block Diagram

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