The bq769x0 familyof robust analog front-end (AFE) devices serves as part of a complete pack monitoring andprotection solution for next-generation, high-power systems, such as light electric vehicles, powertools, and uninterruptible power supplies. The bq769x0 is designed with low power in mind: Sub-blocks within the IC maybe enabled or disabled to control the overall chip current consumption, and a SHIP mode provides asimple way to put the pack into an ultra-low power state.
The bq76920 device supports up to 5-seriescells or typical 18-V packs, the bq76930 handles up to 10-series cells or typical 36-V packs, andthe bq76940 works for up to 15-series cells or typical 48-V packs. Avariety of battery chemistries may be managed with these AFEs, including Lithium Ion, Lithium ironphosphate, and more. Through I2C, a host controller can use thebq769x0 to implement manybattery pack management functions, such as monitoring (cell voltages, pack current, packtemperatures), protection (controlling charge/discharge FETs), and balancing. Integrated A/Dconverters enable a purely digital readout of critical system parameters, with calibration handledin TI’s manufacturing process.
Feature
- AFE monitoring features
- Pure digital interface
- Internal ADC measures cell voltage, die temperature, and external thermistor
- A separate, internal ADC measures pack current (coulomb counter)
- Directly supports up to three thermistors (103AT)
- Hardware protection features
- Overcurrent in Discharge (OCD)
- Short Circuit in Discharge (SCD)
- Overvoltage (OV)
- Undervoltage (UV)
- Secondary protector fault detection
- Additional features
- Integrated cell balancing FETs
- Charge, discharge low-side NCH FET drivers
- Alert interrupt to host microcontroller
- 2.5-V or 3.3-V output voltage regulator
- No EEPROM programming necessary
- High supply voltage absolute maximum (up to 108 V)
- Simple I2C compatible interface (CRC option)
- Random cell connection tolerant
