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BQ76972

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3s-to-16s high-accuracy battery monitor and protector for Li-ion, Li-poly and LiFePO4

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The Texas Instruments BQ76972 device is a highly integrated, high-accuracy battery monitor and protector for 3-series to 16-series Li-ion, Li-polymer, and LiFePO 4 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 I 2C, SPI, and HDQ one-wire standards. The BQ76972 device is available in a 48-pin TQFP package.

Battery monitoring capability for 3-series to 16-series cells
High accuracy cell voltage measurement of ±3.0 mV
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 < 1 µV (typical)
Wide-range current applications (±200-mV measurement range across 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 production line
Support for temperature sensing using internal sensor and up to nine external thermistors
Integrated one-time-programmable (OTP) memory programmable by customers on production line
Communication options include 400-kHz I 2C, SPI, and HDQ one-wire interface
Dual-programmable LDOs for external system usage
48-pin TQFP package (PFB)

Number of series cells (min)	3
Vin (max) (V)	80
Features	Autonomous Mode, Coulomb Counter, Digital output, High-side FET drive, I2C support, LDO output, Low-Power Sleep Mode, Multi-cell support, One-Time Programmable (OTP) memory, Open wire (OW), Overcurrent in charging protection, Overcurrent in discharging protection, Overtemperature protection, Overvoltage protection, Power-save mode, Scratchpad memory, Short-current detection, Sleep Mode, Temperature sensing, Undertemperature protection, Undervoltage protection
Device type	Cell monitor and balancer, Protector
Number of series cells (max)	16
Operating temperature range (°C)	-40 to 85
Rating	Catalog
Battery overvoltage protection (min) (V)	1.012
Battery overvoltage protection (max) (V)	5.566
Communication interface	HDQ, I2C, SPI

TQFP (PFB)

81 mm² 9 x 9

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BQ76972

3s-to-16s high-accuracy battery monitor and protector for Li-ion, Li-poly and LiFePO4

4000-306-326