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Texas Instruments BQ27621YZFT-G1A
- Part No.:
- BQ27621YZFT-G1A
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 9-UFBGA, DSBGA
- Datasheet:
-
BQ27621YZFT-G1A.pdf
- Description:
- IC BATT FUEL GAUGE LIION 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:5,379
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Product details
Overview
BQ27621YZFT-G1 from Texas Instruments is a system-side single-cell Li-ion fuel gauge IC that resides on the host PCB and reports remaining capacity (mAh), state-of-charge (%), battery voltage (mV), and temperature (°C) using Dynamic Voltage Correlation-eliminating the need for a sense resistor. It supports 4.2 V, 4.3 V, and 4.35 V chemistries and integrates a 1.8-V LDO regulator powered directly from the battery pack.
For engineers reviewing the BQ27621YZFT-G1 datasheet, BQ27621YZFT-G1 pinout, BQ27621YZFT-G1 application, or BQ27621YZFT-G1 equivalent, key selection considerations include I²C interface compatibility (400 kHz), ultra-low shutdown current (0.6 µA), integrated temperature sensing, Kelvin-pack connection requirements, and preconfigured chemistry profiles with programmable CHEM_ID selection.
Technical Context
The BQ27621YZFT-G1 implements Texas Instruments' proprietary Dynamic Voltage Correlation algorithm to estimate remaining capacity and SOC by correlating real-time cell voltage, open-circuit voltage (OCV), and computed impedance-without current-sense resistors. It operates in five power modes (NORMAL, SLEEP, HIBERNATE, SHUTDOWN, INITIALIZATION) with automatic transitions triggered by load conditions or host commands.
Communication occurs via a fixed 7-bit I²C address (0x55), supporting standard read/write, incremental read/write, and quick read functions. The device uses an internal 15-bit ADC for voltage and temperature measurement, with typical voltage accuracy of ±0.1% and temperature accuracy within ±5°C across –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Battery Type | Single-cell Li-ion (supports 4.2 V / 4.3 V / 4.35 V chemistries via CHEM_ID) |
| I²C Interface | 400-kHz fast-mode compatible; fixed 7-bit address 0x55; open-drain SDA/SCL |
| Supply | Powered directly from battery (2.45–4.5 V BAT input); regulated 1.8-V VDD output |
| Accuracy | Voltage: ±0.1% full-scale; Temperature: ±5°C; SOC: smoothed filter with self-discharge compensation |
| Power Modes | NORMAL (27 µA), SLEEP (21 µA), HIBERNATE (9 µA), SHUTDOWN (0.6 µA) |
| ADC Resolution | 15-bit effective resolution for voltage and temperature measurements |
| Operating Temp | –40°C to +85°C ambient; internal temperature sensor or host-reported option |
Pinout & Package
The BQ27621YZFT-G1 is housed in a 9-pin YZF (DSBGA) package measuring 1.62 mm × 1.58 mm with 0.5 mm pitch. Grounding uses dual VSS pins (B2 primary, C1 floating but usable as ground bridge). Kelvin connections are required at BAT and VSS for optimal voltage accuracy.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | LDO input & battery voltage sense | Kelvin-connected to PACK+; requires 1-µF decoupling to VSS for accuracy |
| BIN | Battery insertion detection input | Pullup/pulldown configuration enables removable or embedded battery detection |
| GPOUT | Configurable open-drain output | Signals BAT_LOW or SOC_INT; exits shutdown when toggled; requires 10-kΩ pullup |
| SCL | I²C clock input | 400-kHz compatible; requires 10-kΩ pullup to VDD |
| SDA | I²C data bidirectional line | Open-drain; requires 10-kΩ pullup to VDD; supports incremental/quick read/write |
| VDD | 1.8-V LDO output | Supplies internal circuitry; decoupled with 0.47-µF ceramic capacitor to VSS |
| VSS | Ground reference | B2 is primary ground; C1 is floating but routable to board ground plane without via |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Voltage Correlation Algorithm | Enables resistorless fuel gauging with high SOC accuracy across discharge rates and temperatures |
| Integrated 1.8-V LDO | Eliminates external regulator; powers internal circuitry directly from battery (2.45–4.5 V input range) |
| Preconfigured Chemistry Profiles | Three factory-set LiCoO₂ profiles (0x1202/0x1210/0x354) selectable via I²C without custom calibration |
| Ultra-Low Power Shutdown | 0.6 µA quiescent current in SHUTDOWN mode preserves battery life during long idle periods |
| Internal Temperature Sensing | On-die sensor provides real-time thermal data for SOC correction; host temperature override supported |
Applications
| Smartphones | Tablets |
|---|---|
|
Use Scenario: Real-time battery status reporting during multi-tasking, video playback, and cellular connectivity. IC Role / Device Role / Timing Role: System-side fuel gauge providing mAh remaining, % SOC, and voltage telemetry over I²C to application processor. Use Value: Enables accurate low-battery warnings and adaptive power management without adding sense-resistor footprint or BOM cost. |
Use Scenario: Battery health monitoring across diverse usage patterns including standby, screen-on, and charging cycles. IC Role / Device Role / Timing Role: Host-located fuel gauge delivering filtered SOC and unfiltered capacity data for OS-level power estimation. Use Value: Maintains ±0.1% voltage accuracy and ±5°C thermal tracking to sustain reliable runtime prediction over 500+ charge cycles. |
| Digital Cameras | Handheld Terminals |
|
Use Scenario: Instant power availability assessment before burst-mode photo capture or video recording. IC Role / Device Role / Timing Role: Standalone fuel gauge interfacing with camera SoC to trigger auto-shutdown at critical SOC thresholds. Use Value: Leverages DVC algorithm to deliver stable SOC readings despite rapid current transients during flash charging or sensor activation. |
Use Scenario: Ruggedized portable devices requiring reliable battery telemetry under industrial temperature extremes. IC Role / Device Role / Timing Role: Embedded fuel gauge operating from –40°C to +85°C with internal temperature compensation. Use Value: Achieves <9 µA HIBERNATE current and Kelvin-pack sensing to ensure field-deployed runtime consistency. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | Same YZF package; supports only 4.2-V chemistry; no 4.3/4.35-V profile support | Limited to standard LiCoO₂ cells; lacks alternate CHEM_ID flexibility | Select when design uses fixed 4.2-V batteries and requires lower firmware complexity |
| BQ27510-G3YZFT | Higher-accuracy Impedance Track™ algorithm; requires sense resistor; larger 12-pin YFP package | Supports multi-cell and higher-precision applications; adds current-sense path overhead | Choose when absolute mAh accuracy >±1% is required and PCB space allows for sense resistor layout |
Compared with BQ27621YZFT-G1, BQ27426YZFT offers reduced feature set but simpler integration for basic 4.2-V use cases, while BQ27510-G3YZFT trades resistorless operation for higher precision and broader chemistry support-requiring additional layout effort and BOM cost.
Availability
BQ27621YZFT-G1 is available at Aetrix Electronics and suitable for smartphones, tablets, digital cameras, and handheld terminals requiring stable component supply, long-term lifecycle support, and production-ready fuel gauging functionality.
Supply support for BQ27621YZFT-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 company specializing in analog and embedded processing technologies, with leadership in power management, signal chain, and battery management solutions.
The BQ27621YZFT-G1 belongs to TI's bq27xxx fuel gauge family designed specifically for system-side, resistorless battery monitoring in space-constrained portable electronics with minimal firmware overhead.
FAQ
What is the primary function of the BQ27621YZFT-G1 in a battery management system?
The BQ27621YZFT-G1 serves as a system-side fuel gauge IC that estimates remaining capacity (mAh), state-of-charge (%), battery voltage (mV), and temperature (°C) for single-cell Li-ion batteries. It uses the Dynamic Voltage Correlation algorithm to eliminate the need for a sense resistor, relying instead on precise voltage and temperature measurements. The BQ27621YZFT-G1 communicates this data to the host processor via I²C, enabling accurate battery status reporting without adding current-sensing components to the PCB.
Does the BQ27621YZFT-G1 require external passive components for basic operation?
Yes-the BQ27621YZFT-G1 requires two mandatory external capacitors: a 1-µF ceramic capacitor between BAT and VSS for LDO input stability, and a 0.47-µF ceramic capacitor between VDD and VSS for LDO output filtering. Additionally, 10-kΩ pullup resistors are required on SCL, SDA, and GPOUT lines to VDD. A 1.8-MΩ pullup on BIN (for removable packs) and 10-kΩ pulldown (on pack side) complete the minimal external component set for functional deployment of the BQ27621YZFT-G1.
How does the BQ27621YZFT-G1 handle different battery chemistries?
The BQ27621YZFT-G1 supports three preconfigured LiCoO₂ chemistries via I²C-accessible CHEM_ID values: 0x1202 (4.2 V max charge), 0x1210 (4.3 V), and 0x354 (4.35 V). These profiles are selected using ALT_CHEM1 or ALT_CHEM2 subcommands under Control(). No user-provided characterization data or custom profile loading is supported-the BQ27621YZFT-G1 relies entirely on these factory-tuned algorithms. Chemistry selection must occur during initialization or configuration update mode, and the active CHEM_ID is reported via the CHEM_ID subcommand.
What power-saving modes does the BQ27621YZFT-G1 support, and how are they triggered?
The BQ27621YZFT-G1 supports five power modes: NORMAL (27 µA), SLEEP (21 µA), HIBERNATE (9 µA), SHUTDOWN (0.6 µA), and INITIALIZATION. Transitions occur automatically based on load activity and timer events, or can be forced via I²C Control() subcommands (e.g., SET_HIBERNATE, SHUTDOWN). GPOUT toggling wakes the device from SHUTDOWN. The BQ27621YZFT-G1 enters SLEEP when I²C inactivity exceeds timeout, and HIBERNATE after extended low-load periods-enabling ultra-low quiescent current in always-on portable applications.
Can the BQ27621YZFT-G1 operate without an external temperature sensor?
Yes-the BQ27621YZFT-G1 includes an integrated on-die temperature sensor used by default for SOC correction and self-discharge compensation. However, it also accepts host-reported temperature via the Temperature() command, allowing systems with higher-accuracy external thermistors or thermal diodes to override the internal reading. The internal sensor operates across –40°C to +85°C with ±5°C accuracy, and its data is accessible via InternalTemperature() command. This dual-sensing capability makes the BQ27621YZFT-G1 flexible for both cost-sensitive and high-precision thermal designs.
BQ27621YZFT-G1A Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 9-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 9-DSBGA
BQ27621YZFT-G1A FAQ
1.How can I place an order for BQ27621YZFT-G1A through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27621YZFT-G1A on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for BQ27621YZFT-G1A reliable?
The price and inventory of BQ27621YZFT-G1A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27621YZFT-G1A is usually 5 days.
3.What payment methods are accepted for BQ27621YZFT-G1A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27621YZFT-G1A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27621YZFT-G1A?
BQ27621YZFT-G1A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27621YZFT-G1A order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for BQ27621YZFT-G1A?
For technical support, including BQ27621YZFT-G1A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27621YZFT-G1A requirements.
6.How does Aetrix verify that BQ27621YZFT-G1A is sourced from the original manufacturer or authorized distributors?
All BQ27621YZFT-G1A products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that BQ27621YZFT-G1A meets industry standards.
7.What is the process for return or replacement of BQ27621YZFT-G1A?
All BQ27621YZFT-G1A units undergo pre-shipment inspection (PSI). If there is an issue with BQ27621YZFT-G1A, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The BQ27621YZFT-G1A part is unused and in its original packaging.
Return procedure for BQ27621YZFT-G1A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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