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BQ27427

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Single-cell battery fuel gauge with pre-programmed chemistry and integrated sense resistor

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Data sheet

BQ27427

ACTIVE
Data sheet Order now

Product details

Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface I2C Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 8000 Implementation System External capacity indication None Features Impedance Track™ algorithm, Integrated Sense Resistor Operating temperature range (°C) -40 to 85 Rating Catalog
Cell chemistry Li-Ion/Li-Polymer Number of series cells Single Cell Communication interface I2C Battery capacity (min) (mAh) 100 Battery capacity (max) (mAh) 8000 Implementation System External capacity indication None Features Impedance Track™ algorithm, Integrated Sense Resistor Operating temperature range (°C) -40 to 85 Rating Catalog
DSBGA (YZF) 9 3.0625 mm² 1.75 x 1.75
  • Single-cell Li-ion battery fuel gauge
    • Resides on system board
    • Supports embedded or removable batteries
    • Powers directly from the battery with integrated LDO
    • Integrates low-value sense resistor: 7mΩ
  • Ultra low power consumption
    • NORMAL mode: 50µA
    • SLEEP mode: 9µA
  • Battery fuel gauging based on patented Impedance Track™ technology
    • Provides three selectable preprogrammed profiles for 4.2V, 4.35V, and 4.4V cells
    • Reports remaining capacity and state-of-charge (SOC) with smoothing filter
    • Adjusts automatically for battery aging, self-discharge, temperature, and rate changes
    • Estimates battery state-of-health (aging)
  • Microcontroller peripheral interface supports:
    • I2C serial interface: 400kHz
    • Configurable SoC interrupt or battery low digital output warning
    • Internal temperature sensor or host reported temperature or external thermistor
  • Single-cell Li-ion battery fuel gauge
    • Resides on system board
    • Supports embedded or removable batteries
    • Powers directly from the battery with integrated LDO
    • Integrates low-value sense resistor: 7mΩ
  • Ultra low power consumption
    • NORMAL mode: 50µA
    • SLEEP mode: 9µA
  • Battery fuel gauging based on patented Impedance Track™ technology
    • Provides three selectable preprogrammed profiles for 4.2V, 4.35V, and 4.4V cells
    • Reports remaining capacity and state-of-charge (SOC) with smoothing filter
    • Adjusts automatically for battery aging, self-discharge, temperature, and rate changes
    • Estimates battery state-of-health (aging)
  • Microcontroller peripheral interface supports:
    • I2C serial interface: 400kHz
    • Configurable SoC interrupt or battery low digital output warning
    • Internal temperature sensor or host reported temperature or external thermistor

The Texas Instruments BQ27427 battery fuel gauge is a single-cell gauge that requires minimal user-configuration and system microcontroller firmware development, leading to quick system bring-up.

Three chemistry profiles are preprogrammed to enable minimal user-configuration and to help manage user inventory across projects with different battery chemistries. The BQ27427 battery fuel gauge has very low sleep power consumption, leading to longer battery run time. Configurable interrupts help to save system power and free the host from continuous polling. An external thermistor supports accurate temperature sensing.

The BQ27427 battery fuel gauge uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).

Battery fuel gauging with the BQ27427 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny, 9-ball, 1.62mm × 1.58mm, 0.5mm pitch NanoFree™ chip scale package (DSBGA) is appropriate for space-constrained applications.

The Texas Instruments BQ27427 battery fuel gauge is a single-cell gauge that requires minimal user-configuration and system microcontroller firmware development, leading to quick system bring-up.

Three chemistry profiles are preprogrammed to enable minimal user-configuration and to help manage user inventory across projects with different battery chemistries. The BQ27427 battery fuel gauge has very low sleep power consumption, leading to longer battery run time. Configurable interrupts help to save system power and free the host from continuous polling. An external thermistor supports accurate temperature sensing.

The BQ27427 battery fuel gauge uses the patented Impedance Track™ algorithm for fuel gauging, and provides information such as remaining battery capacity (mAh), state-of-charge (%), and battery voltage (mV).

Battery fuel gauging with the BQ27427 fuel gauge requires connections only to PACK+ (P+) and PACK– (P–) for a removable battery pack or embedded battery circuit. The tiny, 9-ball, 1.62mm × 1.58mm, 0.5mm pitch NanoFree™ chip scale package (DSBGA) is appropriate for space-constrained applications.
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Technical documentation

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Type Title Date
* Data sheet BQ27427 System-Side Impedance Track™ Fuel Gauge With Integrated Sense Resistor datasheet (Rev. B) PDF | HTML 02 Sep 2025
Application note Battery Gauging Algorithm Comparison PDF | HTML 04 Dec 2023
User guide BQ27427 Technical Reference Manual PDF | HTML 27 Jan 2023
Certificate BQ27427EVM EU RoHS Declaration of Conformity (DoC) 29 Sep 2022

Design & development

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

Evaluation board

BQ27427EVM — BQ27427 evaluation module for Impedance Track™ battery gas gauge with integrated sense resistor

This evaluation module (EVM) is an evaluation system for the BQ27427 battery gauge. The EVM includes the BQ27427 gauge and a link to Windows® based PC software. The circuit module includes the BQ27427 integrated circuit (IC), and all other components necessary to monitor and predict capacity for (...)
User guide: PDF
Not available on TI.com
Interface adapter

EV2400 — USB-Based PC Interface Board for Battery Fuel (Gas) Gauge Evaluation Module

The EV2400 EVM interface board enables an IBM-compatible or other type PC (with the required driver for its particular platform) to communicate with the Texas Instruments SMBus or I2C interface gas gauges via a Universal Serial Bus (USB) port. In addition to this board, PC software is required to (...)

User guide: PDF
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

BQ27XXXSW-LINUX — Linux Driver for BQ27XXX

The Linux driver supports the BQ27x series of Battery Fuel Gauges. The Linux driver supports communication through the I2C/HDQ bus and interfaces with the power supply sub-system to monitor battery properties.

 

Linux Mainline Status

Available in Linux Main line: Yes
Available through git.ti.com: N/A

(...)

View Options
Support software

BQEVSW-MKST-UPDATE — Software Update to enable BQEVSW to use MKST-3P-ALT-EV2300

BQ-BATTERY-PROGRAMMER-SW software development kit (SDK) is a collection of robust software command line tools that assist with the process of programming, testing, or assembling packs that use TI Battery management products. The executables in this software work with the MKST-3P-ALT-EV2300 MKS (...)

Supported products & hardware

Supported products & hardware

Products
Battery fuel gauges
  • BQ2083-V1P3 — SBS-compliant gas gauge for use with bq29311
  • BQ20Z40 — SBS Compliant Gas Gauge with Impedance Track Technology for use with BQ29330
  • BQ20Z40-R1 — SBS 1.1 compliant Gas Gauge with Impedance Track™ Technology
  • BQ20Z45 — SBS 1.1 compliant Gas Gauge with Impedance Track Technology and Advanced Charging Algorithm
  • BQ20Z70-V150 — SBS 1.1-compliant gas gauge enabled with Impedance Track™ technology
  • BQ20Z70-V160 — SBS 1.1-compliant gas gauge enabled with Impedance Track™ technology for use with the bq29330
  • BQ20Z80 — SBS 1.1-compliant gas gauge enabled with Impedance Track™; technology for use with the bq29312
  • BQ20Z80-V102 — SBS 1.1-compliant gas gauge enabled w/Impedance Track™ technology
  • BQ20Z80-V110 — SBS 1.1-compliant gas gauge enabled w/Impedance Track™ technology with FW v1.10
  • BQ20Z80A-V110 — SBS 1.1 compliant gas gauge enabled with Impedance Track™; technology for use with the bq29312A
  • BQ27411-G1 — Pack-side Impedance Track™ fuel gauge | battery gas gauge
  • BQ27421-G1 — System-side(tm) fuel gauge with integrated Sense Resistor | battery 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
  • BQ27426 — Single cell System-side battery fuel (gas) gauge w/Pre-programmed chemistry Profile
  • BQ27427 — Single-cell battery fuel gauge with pre-programmed chemistry and integrated sense resistor
  • BQ27441-G1 — System-side Impedance Track™ battery fuel (gas) gauge
  • BQ27505-J2 — System-side Impedance Track™; fuel gauge with FW v2.15
  • BQ27505-J3 — System-side Impedance Track™; fuel gauge with FW v2.20
  • BQ27505-J4 — System-side Impedance Track™; fuel gauge with FW v2.24
  • BQ27505-J5 — System-side Impedance Track™; fuel gauge with FW v2.29
  • 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
  • BQ3050 — SBS 1.1-compliant 2-s to 4-s battery gas gauge & protection
  • BQ3055 — 2-series, 3-series, and 4-series Li-ion battery pack manager
  • BQ3060 — SBS 1.1-compliant gas gauge and protector
  • BQ30Z554-R1 — 2 series, 3 series, and 4 series Li-ion battery pack manager
  • BQ34110 — Multi-chemistry high-cell Count battery fuel gauge with integrated rarely discharged module
  • BQ34Z100 — 1-s to 16-s Impedance Track™ fuel gauge | battery gas gauge
  • BQ34Z100-G1 — Multi-chemistry Impedance Track™ standalone fuel gauge | battery gas gauge
  • BQ34Z100-R2 — Multichemistry Impedance Track™ stand-alone fuel gauge
  • BQ34Z110 — Wide range fuel gauge with Impedance Track™; for lead acid batteries | battery gas gauge
Hardware development
Evaluation board
  • BQ2000EVM — Evaluation Module for Battery Charge Management IC
  • BQ2022AEVM-001 — BQ2022A Evaluation Module
  • BQ27411EVM-G1A — Pack-Side Impedance Track™ Fuel (Gas) Gauge Evaluation Module
  • BQ27411EVM-G1C — BQ27411EVM-G1C Pack-Side Impedance Track™ Fuel (Gas) Gauge Evaluation Module
  • BQ27421EVM-G1A — BQ27421EVM-G1A System-Side Battery Fuel (Gas) Gauge Evaluation Module Board
  • BQ27421EVM-G1B — BQ27421EVM-G1B System-Side Battery Fuel (Gas) Gauge Evaluation Module
  • BQ27425EVM-G2A — BQ27425EVM-G2A System-Side Impedance Track™ Fuel (Gas) Gauge Evaluation Module
  • BQ27426EVM-738 — BQ27426 EVM for Impedance Track Fuel Gauge w/Easy to Use Pre-programmed Chemistry Profiles
  • BQ27427EVM — BQ27427 evaluation module for Impedance Track™ battery gas gauge with integrated sense resistor
  • BQ27441EVM-G1A — BQ27441 evaluation board 
  • BQ27441EVM-G1B — BQ27441 evaluation board 
  • BQ27510EVM — System-Side Single-Cell Impedance Track™ Technology Evaluation Module  | Battery Fuel Gauge
  • BQ27520EVM — System-Side Impedance Track™ Battery Fuel Gauge Evaluation Module | Gas Gauge
  • BQ27530EVM — BQ27530EVM System-Side Impedance-Track Fuel (Gas) Gauge Direct Battery Connection Evaluation Module
  • BQ27531EVM — Battery Management Unit Impedance Track Fuel (Gas) Gauge Charger Controller Evaluation Module
  • BQ27532EVM-656 — Battery Charging Solution Evaluation Module
  • BQ27542EVM — Li-ion Battery Fuel Gauge Evaluation Module
  • BQ27546EVM-702 — bq27546 Gas Gauge with Impedance Track™ Technology
  • BQ27621EVM-G1 — System-Side Fuel (Gas) Gauge Dynamic Voltage Correlation Evaluation Module
  • BQ27741EVM — BQ27741EVM Pack-Side Impedance Track Fuel (Gas) Gauge Integrated Protector Evaluation Module
  • BQ27742EVM — bq27742-G1 Single Cell Li-ion Battery Fuel (Gas) Gauge Programmable Evaluation Module
  • BQ27750EVM-837 — BQ27750 1-Cell Programmable Battery Manager Evaluation Module
  • BQ3050EVM-001 — bq3050EVM SBS 1.1 Compliant Advanced Gas Gauge EVM
  • BQ34110EVM-796 — bq34110 Multi-Chemistry CEDV Battery Gas Gauge for Rarely Discharged Applications Evaluation Module
  • BQ34210IQ1EVM-826 — bq34210-Q1 Evaluation Module for System Side CEDV Fuel Gauge
  • BQ34Z100EVM — Bq34z100EVM 1s to 16s Impedance Track Fuel Gauge Battery Evaluation Module | Gas Gauge Battery
  • MKST-3P-ALT-EV2300 — MKS Technology alternative for EV2300 communications transceiver
Software
Support software
Application software & framework
  • BQEVSW — BQ evaluation software (BQEVSW) v0.0.92 for BQ30Z554-R1
Download options
Package Pins CAD symbols, footprints & 3D models
DSBGA (YZF) 9 Ultra Librarian
TI's Standard Terms and Conditions for Evaluation Items apply.

Ordering & quality

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  • Fab location
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