BQ7692003PWR

The bq769x0 family of robust analog front-end (AFE) devices serves as part of a complete pack monitoring and protection solution for next-generation, high-power systems, such as light electric vehicles, power tools, and uninterruptible power supplies. The bq769x0 is designed with low power in mind: Subblocks within the IC may be enabled or disabled to control the overall chip current consumption, and a SHIP mode provides a simple way to put the pack into an ultra-low power state. The bq76920 device supports up to 5-series cells or typical 18-V packs, the bq76930 handles up to 10-series cells or typical 36-V packs, and the bq76940 works for up to 15-series cells or typical 48-V packs. A variety of battery chemistries may be managed with these AFEs, including Lithium Ion, Lithium iron phosphate, and more. Through I²C, a host controller can use the bq769x0 to implement many battery pack management functions, such as monitoring (cell voltages, pack current, pack temperatures), protection (controlling charge/discharge FETs), and balancing. Integrated A/D converters enable a purely digital readout of critical system parameters, with calibration handled in TI’s manufacturing process.

Applications

• Light electric vehicles (LEV): eBikes, eScooters, pedelec, and pedal-assist bicycles
• Power tools and garden tools
• Battery backup units (BBUS), energy storage systems (ESS) and uninterruptible power supply (UPS) systems
• Wireless base station backup systems
• 12-V, 18-V, 24-V, 36-V, and 48-V industrial battery packs

Key features

• 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