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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
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Technical documentation

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Type Title Date
* 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 20 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
Not available on TI.com
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

Products
Battery monitors & balancers
  • BQ76905 — Low-power monitor and protector for 2S to 5S with high accuracy cell voltage measurement
  • BQ76907 — Low-power monitor and protector for 2S to 7S with high accuracy cell voltage measurement
  • BQ769142 — 3-s to 14-s high-accuracy battery monitor and protector for Li-ion, Li-polymer and LiFePO4 battery
  • BQ76942 — 3-series to 10-series multicell battery monitor and protector
  • BQ76952 — 3-s to 16-s high-accuracy battery monitor and protector for Li-ion, Li-polymer and LiFePO4
  • BQ76972 — 3s-to-16s high-accuracy battery monitor and protector for Li-ion, Li-poly and LiFePO4
Battery charger ICs
  • BQ24800 — SMBus 1-4 cell Buck battery charge controller to support hybrid power boost and battery boost mode
  • BQ25720 — SMBus 1- to 4-cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG
  • BQ25723 — I²C 1-4 cell NVDC buck-boost battery charge controller with power path and USB-C® PD OTG
  • BQ25731 — I2C 1-5 cell NVDC buck-boost battery charge controller with USB type-C PD support
  • BQ25756 — Stand-alone or I²C-controlled 70-V bidirectional buck-boost charge controller with MPPT
  • BQ25790 — Integrated, NVDC, 5-A 1-cell to 4-cell switch-mode buck-boost battery charger
  • BQ25792 — I2C controlled, 5-A, 1-4 cell buck-boost charger with dual-input selector and USB PD 3.0 OTG output
Battery fuel gauges
  • BQ27220 — Single cell pack/system-side CEDV battery fuel (gas) gauge w/pre-programmed chemistry profiles
  • BQ27320 — Single cell pack/System-side CEDV battery fuel (gas) gauge
  • BQ27425-G1 — System-side Impedance Track™; fuel gauge with direct battery connection | gas gauge battery
  • BQ27425-G2A — System-side Impedance Track™; fuel gauge for LiCoO2 battery
  • BQ27425-G2B — System-side Impedance Track™; fuel gauge LiMn2O4 battery
  • BQ27427 — Single-cell battery fuel gauge with pre-programmed chemistry and integrated sense resistor
  • BQ27520-G4 — System side Impedance Track™ fuel gauge with integrated LDO.
  • BQ27530-G1 — System-side Impedance-Track fuel (gas) gauge with direct battery connection
  • BQ27531-G1 — Battery management unit Impedance Track™ fuel (gas) gauge for bq2419x charger controller
  • BQ27532-G1 — Battery management unit Impedance Track™ fuel gauge for bq2425x charger
  • BQ27545-G1 — Single cell, pack side, Impedance Track™ fuel gauge
  • BQ27546-G1 — Single cell Impedance Track™ pack side fuel gauge with DSBGA package
  • BQ27621-G1 — System-side fuel gauge with Dynamic Voltage Correlation, battery gas gauge
  • BQ27741-G1 — Pack-side Impedance Track™(tm) fuel (gas) gauge with integrated protector
  • BQ27742-G1 — Single cell Li-ion battery fuel gauge with integrated protection | battery gas gauge
  • BQ27Z561 — Impedance Track™ integrated circuit gas gauge solution for 1-series
  • BQ27Z746 — Pack-side, single-cell Impedance Track™ technology fuel gauge with integrated protector
  • BQ28Z610 — Battery fuel gauge with integrated protector for 1-2 series packs
  • BQ34110 — Multi-chemistry high-cell Count battery fuel gauge with integrated rarely discharged module
  • BQ34210-Q1 — Automotive Qualified Single cell system-side CEDV fuel gauge
  • BQ34Z100-G1 — Multi-chemistry Impedance Track™ standalone fuel gauge | battery gas gauge
  • BQ35100 — Battery fuel gauge for non-rechargeable batteries (lithium primary) and end-of-service monitor
  • BQ4050 — 1-4 series CEDV battery fuel (gas) gauge
  • BQ40Z50 — 1-4 series Li-ion battery pack manager | battery fuel (gas) gauge
  • BQ40Z50-R1 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 1.0
  • BQ40Z50-R2 — 1-4 series Li-ion battery pack manager supporting Turbo Mode 2.0
  • BQ40Z60 — Complete multi-cell battery manager | battery fuel (gas) gauge
  • BQ40Z80 — 2-s to 6-s battery pack manager with Impedance Track™ gas gauging
  • BQ78350 — Companion CEDV Fuel Gauge Battery Management Controller for bq76940 Monitor Family
  • BQ78350-R1 — CEDV li-ion gas gauge and battery management controller
  • BQ78Z100 — Impedance Track™ battery fuel (gas) gauge for 1-series to 2-series
Battery protectors
  • BQ77307 — Low-power protector for 2S to 7S with high accuracy cell voltage measurement
Hardware development
Evaluation board
Download options
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

Products
Battery monitors & balancers
  • BQ76905 — Low-power monitor and protector for 2S to 5S with high accuracy cell voltage measurement
  • BQ76907 — Low-power monitor and protector for 2S to 7S with high accuracy cell voltage measurement
  • BQ76907-Q1 — Automotive, 7S low-power high-accuracy battery monitor and protector for LiFePO4 and supercapacitors
Download options
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
Package Pins CAD symbols, footprints & 3D models
VQFN (RGR) 20 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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Information included:
  • Fab location
  • Assembly location

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