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 I

2C compatible interface (CRC option)

– Random cell connection tolerant

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

 Description

The bq769x0 family of robust analog front-end (AFE) devices serves as part of a complete pack monitoring and protection solution for next-generation, highpower 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 I 2C, 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.