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BQ76905

ACTIVE

Low-power monitor and protector for 2S to 5S with high accuracy cell voltage measurement

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Data sheet

BQ76905

ACTIVE
Data sheet Order now

Product details

Rating Catalog Number of series cells (max) 5 Number of series cells (min) 2 Features Digital output, I2C support, Integrated ADC, LDO output, Low-side driver, Multi-cell support, One-time-programmable (OTP) memory, Open-wire detection, Overcurrent in charging protection, Overcurrent in discharging protection, Overtemperature protection, Overvoltage protection, Short-current detection, Temperature sensing, Undertemperature protection, Undervoltage protection Vin (max) (V) 27.5 Communication interface I2C Device type Cell monitor and balancer, Protector Operating temperature range (°C) -40 to 110 Battery overvoltage protection (min) (V) 0 Battery overvoltage protection (max) (V) 5.5 Operating current (typ) (µA) 140
Rating Catalog Number of series cells (max) 5 Number of series cells (min) 2 Features Digital output, I2C support, Integrated ADC, LDO output, Low-side driver, Multi-cell support, One-time-programmable (OTP) memory, Open-wire detection, Overcurrent in charging protection, Overcurrent in discharging protection, Overtemperature protection, Overvoltage protection, Short-current detection, Temperature sensing, Undertemperature protection, Undervoltage protection Vin (max) (V) 27.5 Communication interface I2C Device type Cell monitor and balancer, Protector Operating temperature range (°C) -40 to 110 Battery overvoltage protection (min) (V) 0 Battery overvoltage protection (max) (V) 5.5 Operating current (typ) (µA) 140
VQFN (RGR) 20 12.25 mm² 3.5 x 3.5
  • Battery monitoring capability for 2-series to 5-series cells
  • Integrated low-side drivers for NFET protection with optional autonomous recovery
  • Extensive protection suite including voltage, temperature, current, and internal diagnostics
  • 16-bit delta-sigma voltage ADC
    • High-accuracy cell voltage measurement of 4 mV (typical)
  • A dedicated simultaneous 16- and 24-bit delta-sigma coulomb counter ADC
    • High-accuracy current measurement with low input offset error
    • Wide-range current applications (±200-mV measurement range across sense resistor)
    • 48-bit accumulated charge integrator with timer
  • Host-controlled cell balancing
  • Multiple power modes (typical battery pack operating range conditions)
    • NORMAL mode: 32 µA to 175 µA
    • SLEEP mode: 6 µA
    • DEEPSLEEP mode: 2.7 µA
    • SHUTDOWN Mode: <1 µA
  • High voltage tolerance of 45 V on cell connect and select additional pins
  • Support for temperature sensing using an internal sensor and external thermistor
  • Integrated one-time-programmable (OTP) memory for device settings, programmed by TI
  • 400-kHz I 2C serial communications with optional CRC support
  • Programmable LDO for external system usage
  • 20-pin QFN (RGR) package
  • Battery monitoring capability for 2-series to 5-series cells
  • Integrated low-side drivers for NFET protection with optional autonomous recovery
  • Extensive protection suite including voltage, temperature, current, and internal diagnostics
  • 16-bit delta-sigma voltage ADC
    • High-accuracy cell voltage measurement of 4 mV (typical)
  • A dedicated simultaneous 16- and 24-bit delta-sigma coulomb counter ADC
    • High-accuracy current measurement with low input offset error
    • Wide-range current applications (±200-mV measurement range across sense resistor)
    • 48-bit accumulated charge integrator with timer
  • Host-controlled cell balancing
  • Multiple power modes (typical battery pack operating range conditions)
    • NORMAL mode: 32 µA to 175 µA
    • SLEEP mode: 6 µA
    • DEEPSLEEP mode: 2.7 µA
    • SHUTDOWN Mode: <1 µA
  • High voltage tolerance of 45 V on cell connect and select additional pins
  • Support for temperature sensing using an internal sensor and external thermistor
  • Integrated one-time-programmable (OTP) memory for device settings, programmed by TI
  • 400-kHz I 2C serial communications with optional CRC support
  • Programmable LDO for external system usage
  • 20-pin QFN (RGR) package

The Texas Instruments BQ76905 provides a highly integrated, high-accuracy battery monitor and protector for 2-series to 5-series Li-ion, Li-polymer, LiFePO 4 (LFP), and LTO battery packs. Each device includes a high-accuracy monitoring system, a highly configurable protection subsystem, and support for host-controlled cell balancing. Integration includes low-side protection NFET drivers, a programmable LDO for external system use, and an I 2C host communication interface supporting up to 400-kHz operation with optional CRC. The BQ76905 is available in a 20-pin QFN package.

The Texas Instruments BQ76905 provides a highly integrated, high-accuracy battery monitor and protector for 2-series to 5-series Li-ion, Li-polymer, LiFePO 4 (LFP), and LTO battery packs. Each device includes a high-accuracy monitoring system, a highly configurable protection subsystem, and support for host-controlled cell balancing. Integration includes low-side protection NFET drivers, a programmable LDO for external system use, and an I 2C host communication interface supporting up to 400-kHz operation with optional CRC. The BQ76905 is available in a 20-pin QFN package.
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Technical documentation

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* Data sheet BQ76905 2-Series to 5-Series High Accuracy Battery Monitor and Protector for Li-Ion, Li-Polymer, LiFePO4(LFP), and LTO Battery Packs datasheet PDF | HTML 11 Nov 2023
Application note Why is short-circuit protection more challenging for high- side driver battery packs than low-side driver? PDF | HTML 23 Jan 2026
Application note Understanding BQ76905, BQ76907 Voltage Sampling Measurement Loop PDF | HTML 11 Sep 2025
Application note Cell Balancing With BQ7690x Battery Monitors PDF | HTML 04 Jan 2024
User guide BQ7690x Software Development Guide PDF | HTML 11 Dec 2023
User guide BQ76905 Technical Reference Manual PDF | HTML 17 Nov 2023
Certificate BQ76905EVM EU Declaration of Conformity (DoC) 15 Nov 2023

Design & development

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

Evaluation board

BQ76905EVM — BQ76905 evaluation module for low-power monitor and protector

The BQ76905EVM evaluation module (EVM) is a complete evaluation system for the BQ76905. The BQ76905 is a highly integrated, high-accuracy battery monitor and protector for 2-series to 5-series Li-Ion, LiPolymer and LiFePO4 battery packs. The EVM includes one BQ76905 integrated circuit (IC), sense (...)
User guide: PDF | HTML
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Application software & framework

BQSTUDIO-TEST — Battery Management Studio (bqStudio) Software – Beta version downloads

Battery Management Studio (bqStudio) offers a full suite of robust tools to assist with the process of evaluating, designing with, configuring, testing, or otherwise utilizing TI Battery management products. This includes features that provide full access to registers and data memory including (...)

Supported products & hardware

Supported products & hardware
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Driver or library

BQ7690X-CODE-EXAMPLES — BQ7690x battery monitors code examples

Microcontroller sample code examples for interfacing with BQ7690x battery monitors and protectors.
Supported products & hardware

Supported products & hardware
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Reference designs

TIDA-010268 — 5s to 7s battery pack monitor reference design with low-side MOSFET control

This reference design is a high-cell voltage-accuracy 5s to 7s lithium-ion (Li-ion), lithium iron phosphate (LiFePO4) battery pack design. The design monitors each cell voltage, pack current, cell and metal-oxide semiconductor field-effect transistor (MOSFET) temperature with high accuracy and (...)
Design guide: PDF
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VQFN (RGR) 20 Ultra Librarian
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