Overview
The Texas Instruments BQ76942, specifically the BQ7694204PFBR, 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 is part of the BQ76942 series and is packaged in a 48-pin TQFP (PFB) package. It features a high-accuracy monitoring system, a highly configurable protection subsystem, and support for autonomous or host-controlled cell balancing. The BQ76942 also includes high-side charge-pump NFET drivers, dual programmable LDOs for external system use, and communication options such as 400-kHz I2C, SPI, and HDQ one-wire interface.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Supply Voltage | 4.7 | - | 55 | V |
| Input Voltage Range (VIN) | VSS - 0.3 | - | VSS + 85 | V |
| Stack Voltage Measurement Accuracy | -0.5 | - | 0.5 | V |
| PACK Pin Voltage Measurement Accuracy | -0.5 | - | 0.5 | V |
| LD Pin Voltage Measurement Accuracy | -0.5 | - | 0.5 | V |
| Normal Mode Supply Current | 286 | - | - | µA |
| SLEEP Mode Supply Current | 24 | - | - | µA |
| DEEPSLEEP Mode Supply Current | 9.2 | - | - | µA |
| SHUTDOWN Mode Supply Current | 1.3 | - | - | µA |
| Junction-to-Ambient Thermal Resistance | - | - | 66.0 | °C/W |
Key Features
- High-accuracy monitoring system for battery voltage, current, and temperature.
- Highly configurable protection subsystem with support for overcharge, overdischarge, and short-circuit protection.
- Support for autonomous or host-controlled cell balancing.
- High-side charge-pump NFET drivers.
- Dual programmable LDOs for external system use.
- Communication options: 400-kHz I2C, SPI, and HDQ one-wire interface.
- Integrated one-time-programmable (OTP) memory programmable by customers on the production line.
- Support for temperature sensing using an internal sensor and up to nine external thermistors.
- Tolerant of random cell attach sequence on the production line.
- High-voltage tolerance of 85 V on cell connect and select additional pins.
Applications
- Cordless power tools and garden tools.
- Vacuum cleaners.
- E-bike, e-scooter, and Light Electric Vehicles (LEV).
- Non-military drones.
- Other industrial battery packs (3-series to 10-series).
Q & A
- What is the operating supply voltage range of the BQ76942?
The operating supply voltage range is from 4.7 V to 55 V.
- What types of battery packs does the BQ76942 support?
The BQ76942 supports Li-ion, Li-polymer, and LiFePO4 battery packs.
- What communication interfaces are available on the BQ76942?
The device supports 400-kHz I2C, SPI, and HDQ one-wire interfaces.
- What is the package type and size of the BQ76942?
The BQ76942 is packaged in a 48-pin TQFP (PFB) package with a body size of 7 mm × 7 mm.
- Does the BQ76942 support cell balancing?
- What is the thermal resistance of the BQ76942?
The junction-to-ambient thermal resistance is 66.0 °C/W.
- Can the BQ76942 handle high voltage?
- What is the purpose of the OTP memory in the BQ76942?
The OTP memory is programmable by customers on the production line for customization.
- How does the BQ76942 handle temperature sensing?
- What are some common applications of the BQ76942?
