BQ27621-G1 Texas Instruments Integrated Circuit (BGA) In Stock
Texas Instruments BQ27621-G1 is a system-side single-cell Li-Ion battery fuel gauge IC using Dynamic Voltage Correlation (DVC) technology to estimate state of charge without coulomb counting. It communicates via I2C interface and requires no sense resistor, reducing BOM cost and PCB space. Available in BGA packaging for compact wearable and IoT device designs with worldwide distribution.
- Manufacturer
- Texas Instruments
- Package
- BGA
- Pin Count
- 9
- Lifecycle
- ACTIVE
- Datasheet
- BQ27621-G1 Datasheet PDF
- Category
- Integrated Circuit
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
What are the key features of BQ27621-G1?
- System-side fuel gauge with Dynamic Voltage Correlation (DVC) requiring no sense resistor, reducing BOM cost and PCB footprint
- I2C communication interface enabling easy integration with host microcontrollers for state-of-charge reporting in portable devices
- Optimized for single-cell Li-Ion batteries in ultra-compact BGA package suitable for space-constrained wearable and IoT designs
What is BQ27621-G1 used for?
The BQ27621-G1 is designed for battery-powered portable devices such as wearables, fitness trackers, wireless earbuds, and IoT sensors where accurate state-of-charge estimation is needed without the complexity of coulomb counting. Its no-sense-resistor design simplifies the power path layout and reduces heat generation, making it ideal for ultra-thin and miniaturized product designs. The device also suits smartphones, smart glasses, and medical wearables where battery life monitoring is critical for user experience and safety.
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
Where can I find the BQ27621-G1 datasheet?
BQ27621-G1 Datasheet DownloadOfficial datasheet from Texas Instruments
What are equivalent replacements for BQ27621-G1?
Compatible alternatives and drop-in replacements for BQ27621-G1:
Frequently Asked Questions
How does the BQ27621-G1 estimate battery state of charge?
The BQ27621-G1 uses Dynamic Voltage Correlation (DVC) technology to estimate the state of charge of a single-cell Li-Ion battery. Unlike traditional coulomb-counting fuel gauges, DVC correlates the battery's open-circuit voltage with its charge level using a learned voltage-to-capacity curve, eliminating the need for an external sense resistor and simplifying overall circuit design.
What interface does the BQ27621-G1 use to communicate with a host processor?
The BQ27621-G1 communicates via the I2C serial interface, allowing a host microcontroller to read battery state-of-charge, remaining capacity, voltage, and other fuel gauge parameters over a standard two-wire bus. This simplifies firmware integration and enables sharing the I2C bus with other sensors and peripherals in multi-component system designs.
Does the BQ27621-G1 require an external sense resistor?
No, the BQ27621-G1 does not require an external current-sense resistor, which is one of its key advantages over coulomb-counting fuel gauges. By using voltage-based Dynamic Voltage Correlation instead of measuring current flow, the BQ27621-G1 reduces the component count, eliminates resistor power dissipation, and simplifies PCB layout in compact battery-powered designs.
What battery chemistry is the BQ27621-G1 designed for?
The BQ27621-G1 is designed specifically for single-cell lithium-ion (Li-Ion) and lithium-polymer (LiPo) batteries, which are the most common chemistries in portable consumer electronics. The fuel gauge's DVC algorithm is calibrated for the voltage-to-capacity characteristics of Li-Ion cells, making it best suited for applications using standard 3.6V to 4.2V nominal single-cell battery packs.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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