Overview
The Texas Instruments BQ76942PFBR is a highly integrated, high-accuracy battery monitor and protector designed for 3-series to 10-series Li-ion, Li-polymer, and LiFePO4 battery packs. This device features a comprehensive monitoring system, a highly configurable protection subsystem, and support for autonomous or host-controlled cell balancing. It is packaged in a 48-pin TQFP (PFB) and operates within a temperature range of -40°C to 85°C.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | 48-pin TQFP (PFB) |
| Operating Temperature Range | -40°C to 85°C |
| Package Quantity | Carrier 1,000 (LARGE T&R) |
| Power Modes | NORMAL: 286 µA, SLEEP: 24 µA to 41 µA, DEEPSLEEP: 9 µA to 10 µA, SHUTDOWN: 1 µA |
| High-Voltage Tolerance | 85 V on cell connect and select additional pins |
| Communication Interfaces | 400-kHz I²C, SPI, and HDQ one-wire |
Key Features
- Battery monitoring capability for 3-series to 10-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 with support for simultaneous current and voltage sampling
- High-accuracy coulomb counter with input offset error < 1 µV (typical)
- High-accuracy cell voltage measurement < 10 mV (typical)
- Wide-range current applications (±200-mV measurement range across sense resistor)
- Integrated secondary chemical fuse drive protection
- Autonomous or host-controlled cell balancing
- 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
- Dual programmable LDOs for external system usage
Applications
The BQ76942PFBR is suitable for a variety of battery management applications, including but not limited to:
- Lithium-ion (Li-ion) battery packs
- Lithium-polymer (Li-polymer) battery packs
- Lithium iron phosphate (LiFePO4) battery packs
- Electric vehicles and hybrid electric vehicles
- Energy storage systems
- Portable electronics and power tools
Q & A
- What is the BQ76942PFBR used for?
The BQ76942PFBR is a highly integrated battery monitor and protector for 3-series to 10-series Li-ion, Li-polymer, and LiFePO4 battery packs. - What is the operating temperature range of the BQ76942PFBR?
The operating temperature range is -40°C to 85°C. - What communication interfaces does the BQ76942PFBR support?
The device supports 400-kHz I²C, SPI, and HDQ one-wire interfaces. - Does the BQ76942PFBR support cell balancing?
Yes, it supports both autonomous and host-controlled cell balancing. - What is the typical current consumption in NORMAL mode?
The typical current consumption in NORMAL mode is 286 µA. - Can the BQ76942PFBR handle high-voltage conditions?
Yes, it has a high-voltage tolerance of 85 V on cell connect and select additional pins. - How many external thermistors can the BQ76942PFBR support for temperature sensing?
It can support up to nine external thermistors. - What is the package type and pin count of the BQ76942PFBR?
The device is packaged in a 48-pin TQFP (PFB). - Does the BQ76942PFBR have integrated memory for customer programming?
Yes, it has integrated one-time-programmable (OTP) memory. - What are the power modes available on the BQ76942PFBR?
The device has NORMAL, SLEEP, DEEPSLEEP, and SHUTDOWN power modes.
