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)
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