BQ27542DRZR-G1
| Parameters | |
|---|---|
| Series | Impedance Track™ |
| Moisture Sensitivity Level (MSL) | 2 (1 Year) |
| RoHS Status | ROHS3 Compliant |
| Package / Case | 12-VFDFN Exposed Pad |
| Interface | HDQ, I²C |
| Mfr | Texas Instruments |
| Mounting Type | Surface Mount |
| Operating Temperature | -40°C ~ 85°C (TA) |
| Number of Cells | 1 |
| Battery Chemistry | Lithium Ion |
| Supplier Device Package | 12-SON (2.5x4) |
| Function | Battery Monitor |
| Fault Protection | - |
| Package | Tape & Reel (TR) |
| Product Status | Obsolete |
| Base Product Number | BQ27542 |
| REACH Status | REACH Unaffected |
| Standard Package | 3,000 |
| ECCN | EAR99 |
| HTSUS | 8542.39.0001 |
BQ27542DRZR-G1 Single-Cell Li-Ion Battery Fuel Gauge
The BQ27542DRZR-G1 is a highly integrated single-cell lithium-ion battery fuel gauge manufactured by Texas Instruments, belonging to the Impedance Track™ series and designed for pack-side battery monitoring in portable electronic devices. This device eliminates the need for a microcontroller by autonomously tracking battery charge state using TI's patented Impedance Track™ algorithm, delivering accurate readings of battery capacity (mAh), state of charge (%), voltage (mV), current, and temperature (°C). Supporting battery capacities up to 14,500 mAh, it is the ideal solution for smartphones, tablets, digital cameras, handheld terminals, and MP3 players where precise remaining runtime prediction and battery health management are critical.
Core Technology and Features
At the heart of the BQ27542DRZR-G1 lies TI's proprietary Impedance Track™ technology, which continuously monitors battery impedance in real time to deliver far more accurate state-of-charge estimates than traditional coulomb counting alone. The device supports low-value sense resistors ranging from 5 mΩ to 20 mΩ, minimizing power loss in the sense path while maintaining high measurement precision. It provides both filtered and unfiltered SOC data, along with battery performance simulation curves that enable runtime prediction under varying load conditions. The fuel gauge automatically compensates for battery aging, self-discharge, and temperature-dependent inefficiencies, ensuring consistent accuracy throughout the battery's entire lifespan without requiring host MCU intervention.
The BQ27542DRZR-G1 features dual communication interfaces: a high-speed 1-Wire HDQ protocol and a standard I2C interface, giving designers flexibility in system architecture. It integrates 64 bytes of non-volatile RAM (Data Flash) for storing critical battery data such as cycle count, voltage history, and error logs. For security-sensitive applications, the device supports SHA-1 and HMAC authentication algorithms, enabling safe battery pack certification that prevents counterfeit or unauthorized battery replacement. Advanced protection features include internal short-circuit detection, battery terminal removal detection, and over-temperature safeguards, all operating within a 2.7 V to 5.5 V supply range with a typical operating current of just 131 µA.
Alternative Battery Monitor ICs
● BQ27541DRZR-G1 (Texas Instruments) - A closely related Impedance Track™ fuel gauge with similar accuracy but slightly different Data Flash configuration, offering a drop-in alternative for designs requiring 32 bytes instead of 64 bytes of non-volatile storage.
● BQ27542DRZT-G1 (Texas Instruments) - The same BQ27542-G1 functionality in tape-and-reel packaging optimized for automated pick-and-place assembly lines, preferred in high-volume manufacturing over the Digi-Reel format.
● MAX17048G+ (Analog Devices/Maxim) - A 1-cell fuel gauge with ModelGauge m5 algorithm delivering comparable accuracy in a smaller 4-bump WLP package, ideal for ultra-thin wearable and earbud designs.
● BQ27520DRZR-G1A (Texas Instruments) - A newer Impedance Track™ variant with integrated safety functions and RAW battery voltage measurement, serving as a next-generation upgrade for automotive-adjacent portable applications.
