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BQ27441DRZT-G1B

TIBQ27441DRZT-G1B

Texas Instruments
Battery Battery Monitor IC Lithium Ion 12-SON (2.5x4)
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Overview

The BQ27441DRZT-G1B is a single-cell Li-Ion battery fuel gauge that uses TI patented Impedance Track technology to provide accurate state-of-charge (SOC) monitoring. It resides on the system board, supporting both embedded and removable batteries without requiring deep integration into the battery pack itself. The IC simplifies design by integrating an LDO and utilizing an external low-value sense resistor to minimize power loss.

Why Choose This Part

It features a smoothing filter for stable SOC reporting and automatically adjusts for battery aging, temperature, and self-discharge rates. The integrated LDO allows the gauge to be powered directly from the battery, reducing external component count and PCB footprint.

Applications

Handheld Medical Devices
Provides critical state-of-health and remaining capacity data for portable diagnostic equipment.
Wearable Electronics
Utilizes a tiny 2.5mm x 4mm VSON package and low 9uA standby current to extend the life of small-capacity batteries.
Industrial IoT Sensors
Monitors battery aging and self-discharge in remote sensors to predict maintenance intervals.
Smartphone Peripherals
Integrates into mobile accessories to report accurate battery levels to a host microcontroller via I2C.

Key Specifications

Function Battery Monitor
Interface I2C
Mounting Type Surface Mount
Package / Case 12-VFDFN Exposed Pad
Number of Cells 1
Battery Chemistry Lithium Ion
Operating Temperature -40degC ~ 85degC (TA)
Supplier Device Package 12-SON (2.5x4)

Getting Started

Designers can evaluate this IC using the BQ27441EVM evaluation module and TI Battery Management Studio (bqStudio) software. Communication is handled via a 400-kHz I2C interface, requiring only a standard microcontroller peripheral and a 10 mOhm sense resistor for operation.

Also Consider

MAX17048 Maxim Integrated / Analog Devices - Offers a simpler ModelGauge algorithm that eliminates the need for an external sense resistor, saving board space.
BQ27421-G1 TITexas Instruments - A similar Impedance Track gauge provided in a smaller WCSP package for extremely space-constrained applications.
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