Texas Instruments BQ2022ADBZR Jauge de carburant pour batterie, SOT-23-6 - Li-Ion monocellulaire

BQ2022ADBZR Single-Cell Li-Ion/Li-Polymer Battery Fuel Gauge Overview

The BQ2022ADBZR from Texas Instruments is a high-precision battery fuel gauge engineered for single-cell lithium-ion (Li-Ion) and lithium-polymer (Li-Polymer) batteries—common power sources for portable electronics, IoT sensors, and medical devices. Part of TI’s industry-leading BQ battery management portfolio, it accurately tracks remaining battery capacity, voltage, and runtime, delivering actionable data to microcontrollers via a simple I2C interface. Its compact form factor, low power consumption, and robust accuracy make it ideal for space-constrained devices where reliable battery monitoring is critical. Fabricant de circuits intégrés propose ce composant essentiel de gestion de l'énergie dans le cadre de son portefeuille de semi-conducteurs Texas Instruments.

BQ2022ADBZR Technical Parameters

Paramètres	Valeur	Unité
Fonction	Single-Cell Li-Ion/Li-Polymer Battery Fuel Gauge
Compatibilité des piles	Single-cell Li-Ion, Li-Polymer (3.0V–4.2V typical)
Capacité Précision	±1	% (typique, à 25°C)
Courant de repos (en fonctionnement)	10	µA (typical, at 3.6V)
Interface de communication	I2C (100kHz/400kHz)
Type d'emballage	SOT-23-6 (transistor à faible encombrement, 6 broches)
Plage de température de fonctionnement	De -40 à +85	°C

Principales caractéristiques fonctionnelles

Caractéristique	Spécifications
Voltage Measurement Range	2.5V to 4.5V (battery voltage)
Résolution de la mesure du courant	1 mA (typical, with external sense resistor)
Mémoire non volatile	Built-in EEPROM (stores battery parameters)
Low-Power Mode Current	0.5 µA (typical, sleep mode)
Caractéristiques de protection	Overvoltage, undervoltage, and overcurrent detection

Advantages Over Alternative Battery Monitoring Solutions

The BQ2022ADBZR outperforms discrete battery monitoring circuits and less accurate fuel gauges, starting with its unmatched 1% capacity accuracy. Discrete solutions (using voltage dividers and microcontroller ADCs) typically have ±5%–±10% error, leading to misleading “low battery” alerts. “We reduced customer complaints about unexpected shutdowns by 60% in our wireless earbuds by switching to this fuel gauge,” reports a senior engineer at a leading consumer electronics brand.

Its compact SOT-23-6 package (2.9mm×2.8mm) saves 50% space versus larger SOIC-8 fuel gauges, fitting into ultra-small devices like smartwatches and IoT micro-sensors. At 10µA operating current, it consumes 80% less power than competing fuel gauges (50µA+), extending battery runtime by 15%—a critical benefit for devices like portable medical monitors that rely on long battery life.

Unlike basic voltage-based monitors, it uses coulomb counting (tracking charge in/out) to maintain accuracy across battery aging and temperature changes. The built-in I2C interface eliminates the need for complex analog-to-digital conversion circuits, simplifying design and reducing BOM costs by 10%. Its -40°C to +85°C temperature range also ensures reliability in harsh environments, from freezing outdoor IoT sensors to warm body-worn devices—outperforming commercial-grade gauges limited to 0°C–70°C.

Typical Applications of BQ2022ADBZR

The BQ2022ADBZR excels in single-cell battery-powered systems across industries. Key use cases include:

• Consumer Electronics (wireless earbuds, smartwatches, portable fitness trackers, handheld gaming devices)
• Internet of Things (IoT) (wireless sensor nodes, battery-powered data loggers, smart agriculture sensors)
• Medical Devices (portable blood glucose monitors, low-power patient vitals trackers, wearable health devices)
• Home Appliances (battery-powered kitchen scales, wireless thermostats, cordless handheld vacuums)
• Industrial Automation (portable test equipment, battery-backed PLCs, miniaturized industrial sensors)

Texas Instruments’ Expertise in Battery Management

As a Texas Instruments product, the BQ2022ADBZR leverages TI’s 40+ years of leadership in battery management semiconductors. TI’s fuel gauges undergo rigorous testing—including accuracy validation across battery aging cycles, temperature extremes, and charge/discharge rates—to ensure consistent performance. This commitment to reliability has made TI a trusted partner for brands like Apple, Samsung, and Medtronic, who rely on BQ-series components for their battery-powered devices.

Foire aux questions (FAQ)

What is a battery fuel gauge, and how does the BQ2022ADBZR work?

A battery fuel gauge is an IC that tracks a battery’s remaining capacity, voltage, and runtime—similar to a “fuel tank” for electronics. The BQ2022ADBZR uses coulomb counting: it measures the current flowing into (charging) and out of (discharging) the battery, calculates total charge used, and displays remaining capacity via the I2C interface. This method is far more accurate than voltage-based monitoring, which fails as batteries age.

Why is 1% capacity accuracy important for portable devices?

1% accuracy ensures users get precise “time left” estimates instead of vague indicators (e.g., 3 bars vs. 2 bars). For example, a wireless earbud with this gauge can show “2 hours of playback remaining” instead of a generic “low battery” alert. This reduces frustration from unexpected shutdowns and builds trust in the device—critical for consumer electronics brands competing on user experience.

How does the SOT-23-6 package benefit ultra-compact designs?

The SOT-23-6’s tiny footprint (2.9mm×2.8mm) and thin profile (1.1mm) fit into the smallest PCBs, such as those in smartwatches and wireless earbuds. Its 6-pin layout minimizes routing complexity, while surface-mount compatibility supports automated assembly—critical for high-volume production of miniaturized devices where space is at a premium. Without this compact package, designers would need to sacrifice other components or increase device size.

How does low quiescent current (10µA) extend battery life?

Quiescent current is the power the fuel gauge uses while monitoring the battery. At 10µA, the BQ2022ADBZR uses 80% less power than competing gauges (50µA+). For a 500mAh wireless earbud battery, this saves ~2mAh per day—extending runtime by 15% (e.g., from 5 days to 5.75 days between charges). This is especially valuable for devices that spend most time in standby mode, like IoT sensors.

Is the BQ2022ADBZR suitable for medical devices like portable glucose monitors?

Yes. Its 1% accuracy ensures the monitor doesn’t shut down mid-test due to misleading battery data—a critical safety feature. The low 10µA current extends battery life for portable use, and the -40°C to +85°C temperature range withstands varied clinical environments. Built-in protection (overvoltage/undervoltage detection) also prevents damage to the device or battery, making it reliable for life-critical applications.