Summary of BQ76952 3- TO 16-SERIES BATTERY MONITORS AND PROTECTORS FOR LI-ION, LI-POLYMER, AND LIFEPO4 BATTERY PACKS
Texas Instruments’ BQ76952 is a high-accuracy, highly integrated battery monitor and protector for 3- to 16-series Li-Ion, Li-Polymer, and LiFePO4 packs. It combines dual ADCs, a precise coulomb counter, integrated charge-pump NFET drivers, extensive protection features, autonomous or host-controlled cell balancing, programmable LDOs, OTP memory, and multiple communication interfaces (I2C, SPI, HDQ). The device supports wide current ranges, many power modes, temperature sensing, and robust production-line tolerance in a 48-pin TQFP package.
Parts used in the BQ76952 Battery Monitor and Protector:
- BQ76952 device (48-pin TQFP)
- High-side charge-pump NFET drivers (integrated)
- Dual-programmable LDOs (integrated)
- Dual independent ADCs (integrated)
- Coulomb counter input circuitry (integrated)
- Sense resistor for current measurement (external)
- External thermistors (up to nine, optional)
- External NFETs for protection/balancing (usage with drivers)
- Host communication interface wiring for 400 kHz I2C, SPI, or HDQ
- One-time-programmable (OTP) memory (integrated)
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)
- What cell counts does the BQ76952 support?
It supports 3-series to 16-series battery packs. - Can the BQ76952 perform cell balancing autonomously?
Yes, it supports autonomous or host-controlled cell balancing. - What communication interfaces are available on the BQ76952?
It supports 400 kHz I2C, SPI, and HDQ one-wire interfaces. - Does the device include charge-pump NFET drivers?
Yes, it includes an integrated charge pump for high-side NFET protection. - What is the typical accuracy of cell voltage measurement?
Typical cell voltage measurement accuracy is less than 10 mV. - How accurate is the coulomb counter?
The coulomb counter has input offset error less than 1 µV (typical). - What power modes and typical currents does the BQ76952 offer?
It offers NORMAL mode at 286 µA, SLEEP modes from 24 µA to 41 µA, DEEPSLEEP modes from 9 µA to 10 µA, and SHUTDOWN at 1 µA. - Can the BQ76952 handle high pack voltages?
Yes, it has high voltage tolerance of 85 V on cell connect and select pins. - Does the device support temperature sensing?
Yes, it supports an internal temperature sensor and up to nine external thermistors. - Is there programmable memory for production-line configuration?
Yes, it includes integrated one-time-programmable (OTP) memory programmable on the production line.
