Overview
The BQ76920, part of the BQ769x0 family from Texas Instruments, is a robust analog front-end (AFE) device designed for battery monitoring and protection in high-power systems. This device is particularly suited for applications such as light electric vehicles, power tools, and uninterruptible power supplies. It supports up to 5-series cells or typical 18-V packs and manages various battery chemistries including Li-ion and Li-iron phosphate. The BQ76920 operates with a pure digital interface and integrates multiple A/D converters for monitoring cell voltages, pack current, and temperatures. It also features low power consumption with the ability to enable or disable sub-blocks and an ultra-low power SHIP mode.
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | TSSOP (PW) | 20 pins |
| Operating Temperature Range | °C | -40 to 85 |
| Supply Voltage (BAT–VSS) | V | 6 to 25 |
| High Supply Voltage Absolute Maximum | V | Up to 108 |
| Output Voltage Regulator | V | 2.5 or 3.3 |
| Cell Balancing Current (per cell) | mA | Up to 70 |
| I2C Interface | Simple I2C compatible with CRC option | |
| Thermistor Support | Up to three thermistors (103AT) |
Key Features
- AFE Monitoring Features: Pure digital interface, internal ADC measures cell voltage, die temperature, and external thermistor.
- Internal ADCs: Separate ADC measures pack current (coulomb counter).
- Hardware Protection Features: Overcurrent in Discharge (OCD), Short Circuit in Discharge (SCD), Overvoltage (OV), Undervoltage (UV), and secondary protector fault detection.
- Integrated Cell Balancing FETs: For balanced charging and discharging.
- Charge and Discharge FET Drivers: Low-side NCH FET drivers for charge and discharge control.
- Alert Interrupt: To host microcontroller for critical events.
- No EEPROM Programming Necessary: Simplified setup and operation.
- Random Cell Connection Tolerant: Flexible configuration options.
Applications
- Light Electric Vehicles: Ideal for monitoring and protecting battery packs in electric vehicles.
- Power Tools: Suitable for high-power battery management in power tools.
- Uninterruptible Power Supplies (UPS): Ensures reliable battery monitoring and protection in UPS systems.
- Other High-Power Systems: Applicable to various high-power applications requiring robust battery management.
Q & A
- What is the BQ76920 used for?
The BQ76920 is used for battery monitoring and protection in high-power systems such as light electric vehicles, power tools, and uninterruptible power supplies.
- How many series cells does the BQ76920 support?
The BQ76920 supports up to 5-series cells or typical 18-V packs.
- What types of battery chemistries can the BQ76920 manage?
The BQ76920 can manage various battery chemistries including Li-ion and Li-iron phosphate.
- What is the operating temperature range of the BQ76920?
The operating temperature range of the BQ76920 is -40°C to 85°C.
- Does the BQ76920 require EEPROM programming?
No, the BQ76920 does not require EEPROM programming.
- What is the maximum supply voltage the BQ76920 can handle?
The BQ76920 can handle a high supply voltage absolute maximum of up to 108 V.
- How does the BQ76920 communicate with the host controller?
The BQ76920 communicates with the host controller through a simple I2C interface with a CRC option.
- What kind of protection features does the BQ76920 offer?
The BQ76920 offers protection features such as Overcurrent in Discharge (OCD), Short Circuit in Discharge (SCD), Overvoltage (OV), Undervoltage (UV), and secondary protector fault detection.
- Does the BQ76920 support thermistors?
Yes, the BQ76920 directly supports up to three thermistors (103AT).
- What is the purpose of the integrated cell balancing FETs in the BQ76920?
The integrated cell balancing FETs in the BQ76920 are used for balanced charging and discharging of the battery cells.
