Overview
The Texas Instruments BQ27621-G1 is a system-side fuel gauge designed for accurate battery capacity and state-of-charge (SOC) monitoring of single-cell Li-ion batteries. This device utilizes the patented Impedance Track™ algorithm with Dynamic Voltage Correlation to provide high-accuracy fuel gauging without the need for a sense resistor. It supports various battery chemistries, including 4.2V, 4.3V, and 4.35V, and is particularly suited for space-constrained applications due to its compact 9-pin YZF package (1.62 mm × 1.58 mm, 0.5 mm pitch).
Key Specifications
| Parameter | Description | Value |
|---|---|---|
| Package | 9-pin YZF (DSBGA) | 1.62 mm × 1.58 mm, 0.5 mm pitch |
| Interface | 400-kHz I2C Serial Interface | |
| Supported Chemistries | 4.2V, 4.3V, and 4.35V | |
| Temperature Range | –40°C to 85°C | |
| Thermal Resistance (θJA) | Junction-to-ambient thermal resistance | 107.8 °C/W |
| Supply Current | At TA = 30°C and VREGIN = VBAT = 3.6 V | Typical values vary; see datasheet for details |
| Internal Temperature Sensor | Or host reported temperature |
Key Features
- Easy to configure fuel gauging based on the Dynamic Voltage Correlation algorithm, eliminating the need for a sense resistor.
- Automatically adjusts for self-discharge, temperature, and rate changes.
- Reports remaining capacity and state of charge (SOC) with a smoothing filter.
- Supports battery state of health (aging) estimation.
- Configurable SOC interrupt or battery low digital output warning.
- Internal temperature sensor or host reported temperature.
- Microcontroller peripheral supports including 400-kHz I2C serial interface.
Applications
- Smartphones, feature phones, and tablets.
- Digital still and video cameras.
- Handheld terminals.
- MP3 or multimedia players.
Q & A
- What is the BQ27621-G1 used for?
The BQ27621-G1 is used for accurate battery capacity and state-of-charge monitoring of single-cell Li-ion batteries.
- What algorithm does the BQ27621-G1 use for fuel gauging?
The BQ27621-G1 uses the patented Impedance Track™ algorithm with Dynamic Voltage Correlation.
- What are the supported battery chemistries?
The device supports 4.2V, 4.3V, and 4.35V battery chemistries.
- What interface does the BQ27621-G1 use?
The BQ27621-G1 uses a 400-kHz I2C serial interface.
- Does the BQ27621-G1 require a sense resistor?
No, the BQ27621-G1 does not require a sense resistor for calculating remaining battery capacity.
- How does the BQ27621-G1 adjust for battery aging and temperature?
The device automatically adjusts for self-discharge, temperature, and rate changes.
- What is the temperature range of the BQ27621-G1?
The temperature range is –40°C to 85°C.
- What package type is the BQ27621-G1 available in?
The BQ27621-G1 is available in a 9-pin YZF (DSBGA) package.
- Can the BQ27621-G1 be used in space-constrained applications?
- What are some common applications of the BQ27621-G1?
Common applications include smartphones, digital cameras, handheld terminals, and MP3 or multimedia players.
