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Product details

Parameters

Number of series cells (Min) 3 Vin (Max) (V) 25 Features Low-side driver, Overcurrent in discharging protection, Short-current detection Number of series cells (Max) 5 Operating temperature range (C) -40 to 85 Rating Catalog open-in-new Find other Battery monitors & balancers

Package | Pins | Size

TSSOP (PW) 20 42 mm² 6.5 x 6.4 open-in-new Find other Battery monitors & balancers

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

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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, high-power systems, such as light electric vehicles, power tools, and uninterruptible power supplies. The bq769x0 is designed with low power in mind: Sub-blocks 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.

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BQ76925 ACTIVE Analog front end for 3 to 6 series lithium-ion cells 5s analog front end (no ADC integrated)

Technical documentation

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Type Title Date
* Datasheet bq769x0 3-series to 15-series cell battery monitor family for li-ion and phosphate applications datasheet (Rev. H) Mar. 06, 2019
Technical article How to stack battery monitors for high-cell-count industrial applications Feb. 11, 2021
Technical article Protector, monitor or gauge – selecting the correct battery electronics for your Li-ion-powered system Jun. 13, 2019
Application note BQ769x0 Pin Equivalent Diagrams (Rev. A) Apr. 03, 2019
User guide bq76920 Evaluation Module User's Guide (Rev. D) Nov. 12, 2018
Application note UART-Based Communication Protocol for Intermodule Communication of Light Vehicle May 17, 2017
Application note bq769x0 BMS Configurations for Cordless Appliances Mar. 23, 2017
Application note Fault Monitoring for High-Availability Systems using the bq769x0 Feb. 03, 2017
Technical article How active and passive cell balancing works Oct. 05, 2016
Application note Embedded Scheduler in Cell Battery Monitor of the bq769x0 Aug. 10, 2016
Application note bq769x0 Family Top 10 Design Considerations (Rev. A) May 02, 2016
Technical article Big batteries? Take a walk on the (high) side Feb. 01, 2016
Application note bq769x0 boot switch alternatives Dec. 21, 2015
Application note I2C Communication Sample Code for the bq76940 with CRC Based on the MSP430 (Rev. B) May 14, 2014
User guide bq76920, bq76930, bq76940 AFE FAQ May 07, 2014

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Hardware development

EVALUATION BOARD Download
document-generic User guide
149
Description

The bq76920EVM is a populated circuit board for evaluation of the bq7692000 analog front-end (AFE) along with the bq78350 Battery Management Controller that serves as part of a complete pack monitoring and protection solution for 3 to 5-series Lithium Ion, Lithium iron phosphate, and more battery (...)

Features
  • Populated circuit board with:
  • Bq7692000 AFE IC
  • Bq78350 Battery Management controller
  • FETs for current control
  • Test point patterns for easy evaluation

Software development

FIRMWARE Download
SLUC583.ZIP (12 KB)
SUPPORT SOFTWARE Download
SLUC539A.ZIP (2752 KB)

CAD/CAE symbols

Package Pins Download
TSSOP (PW) 20 View options

Ordering & quality

Information included:
  • RoHS
  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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