Texas Instruments BQ27441DRZR-G1B

Overview

BQ27441DRZR-G1 from Texas Instruments is a system-side single-cell Li-ion battery fuel gauge IC using Impedance Track™ algorithm to report remaining capacity (mAh), state-of-charge (%), voltage (mV), and state-of-health. It integrates a 1.8-V LDO, 16-bit coulomb counter, and internal temperature sensor, and operates directly from the battery pack (2.45–4.5 V). It targets space-constrained portable electronics requiring accurate runtime estimation.

For engineers reviewing the BQ27441DRZR-G1 datasheet, BQ27441DRZR-G1 pinout, BQ27441DRZR-G1 application, or BQ27441DRZR-G1 equivalent, key selection criteria include its 10-mΩ high-side sense resistor support, I²C interface timing compliance (up to 400 kHz), ultra-low shutdown current (0.6 µA), integrated LDO output (1.8 V), and firmware-configurable battery low warning via GPOUT.

Technical Context

The BQ27441DRZR-G1 implements Texas Instruments' patented Impedance Track™ algorithm, which dynamically models cell impedance using real-time voltage, current, temperature, and open-circuit voltage data to deliver high-accuracy SoC estimation across aging, temperature variation (–40°C to 85°C), and load transients. Its coulomb counter uses a 16-bit integrating ADC with ±25 mV differential input range referenced to SRP/SRN pins.

It operates in four power modes-NORMAL (93 µA), SLEEP (21 µA), HIBERNATE (9 µA), and SHUTDOWN (0.6 µA)-with automatic transitions triggered by activity or host command. Wake-up from SHUTDOWN is enabled via rising edge on GPOUT (1.2 V threshold), and the integrated 1.8-V LDO is powered directly from BAT with 0.47-µF output decoupling.

Key Specifications

Pinout & Package

Package: 12-pin VSON (DRZ), 2.50 mm × 4.00 mm, 0.5-mm pitch, wettable flank - optimized for automated optical inspection and high-density PCB layouts in handheld devices.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar fuel gauging applications.

Compared with BQ27421-G1, the BQ27441DRZR-G1 provides higher coulomb counter resolution and support for 4.35-V batteries, making it suitable for next-gen high-energy-density cells; compared with BQ27510-G3, it offers smaller footprint and lower system complexity where external protection is already implemented.

Availability

BQ27441DRZR-G1 is available at Aetrix Electronics and suitable for smartphones, tablets, and handheld terminals requiring stable component supply, long-term lifecycle support, and guaranteed traceability for consumer electronics production.

Supply support for BQ27441DRZR-G1 includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in battery management systems.

The BQ27441DRZR-G1 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for accurate, low-power, system-side battery monitoring in space-constrained portable devices without requiring host MCU calibration effort.

FAQ

What battery chemistries does the BQ27441DRZR-G1 support?

The BQ27441DRZR-G1 is factory-configured for LiCoO₂ chemistry with a maximum charge voltage of 4.3–4.35 V (CHEM_ID = 0x0312). It does not support LiFePO₄, NMC, or LTO chemistries out-of-box; reconfiguration requires custom firmware and validation. The BQ27441DRZR-G1 relies on this specific chemistry profile to execute its Impedance Track™ algorithm accurately.

How is the BQ27441DRZR-G1 powered, and what external components are mandatory?

The BQ27441DRZR-G1 draws power directly from the battery via the BAT pin (2.45–4.5 V) and regulates it internally to supply a 1.8-V LDO output at VDD. Mandatory external components include a 1-µF capacitor between BAT and VSS, a 0.47-µF ceramic capacitor between VDD and VSS, and 10-kΩ pullup resistors on SDA and SCL. The BQ27441DRZR-G1 will not operate reliably without these decoupling elements.

Can the BQ27441DRZR-G1 be used with removable battery packs?

Yes - the BQ27441DRZR-G1 supports removable packs via the BIN pin, which detects battery insertion using a pulldown resistor on the pack and an internal 1.8-MΩ pullup on the gauge. When OpConfig [BI_PU_EN] = 1 (default), removal pulls BIN high and insertion pulls it low. The BQ27441DRZR-G1 maintains accurate SoC tracking across insert/remove cycles without recalibration.

What is the function of the GPOUT pin on the BQ27441DRZR-G1?

The GPOUT pin on the BQ27441DRZR-G1 is multifunctional: by default, it pulses as an SOC_INT interrupt on SoC change; it can be configured via OpConfig to assert BAT_LOW when voltage drops below threshold; and critically, it serves as a wake-up input - a rising edge >1.2 V exits SHUTDOWN mode. The BQ27441DRZR-G1 requires a 10-kΩ pullup on GPOUT even when unused to prevent floating states.

Does the BQ27441DRZR-G1 require calibration during system integration?

No - the BQ27441DRZR-G1 is factory-calibrated for use with a standard 10-mΩ, 1% external sense resistor and requires no user calibration. Its Impedance Track™ algorithm automatically compensates for battery aging, self-discharge, temperature, and rate effects. The BQ27441DRZR-G1 achieves <±1% SoC accuracy across life cycle without host MCU intervention or characterization routines.