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Texas Instruments BQ27621YZFR-G1A
- Part No.:
- BQ27621YZFR-G1A
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 9-UFBGA, DSBGA
- Datasheet:
-
BQ27621YZFR-G1A.pdf
- Description:
- IC BATT FUEL GAUGE LIION 9DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,106
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Product details
Overview
BQ27621YZFR-G1 from Texas Instruments is a system-side single-cell Li-ion fuel gauge IC that resides on the host board 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 BQ27621YZFR-G1 datasheet, BQ27621YZFR-G1 pinout, BQ27621YZFR-G1 application, or BQ27621YZFR-G1 equivalent, key selection considerations include I²C interface compatibility (400 kHz), ultra-low shutdown current (0.6 µA), integrated temperature sensing, Kelvin-pack connection support, and preconfigured chemistry profiles requiring minimal firmware integration.
Technical Context
The BQ27621YZFR-G1 implements TI's proprietary Dynamic Voltage Correlation algorithm to estimate state-of-charge without current-sense resistors-relying instead on real-time cell voltage, open-circuit voltage (OCV), and impedance modeling. Its internal ADC provides 15-bit effective resolution for voltage and temperature measurements with 125-ms conversion time.
It operates in five power modes-NORMAL (27 µA), SLEEP (21 µA), HIBERNATE (9 µA), SHUTDOWN (0.6 µA), and INITIALIZATION-with automatic transitions triggered by bus activity or battery events. The device uses a fixed 7-bit I²C address (0x55) and supports standard, incremental, quick-read, and one-byte write transactions per JEDEC-compliant timing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Voltage Range | 2.45 V to 4.5 V BAT input-supports full Li-ion operating range including 4.35 V high-voltage cells. |
| LDO Output | 1.8 V ±0%-powers internal circuitry and external logic; decoupled with 0.47 µF ceramic capacitor. |
| I²C Speed | Up to 400 kHz Fast Mode-enables rapid host polling without protocol overhead; 100 kHz Standard Mode also supported. |
| ADC Resolution | 15-bit effective-delivers high-precision voltage and temperature readings critical for SOC accuracy across temperature. |
| Shutdown Current | 0.6 µA-minimizes battery drain during long-term storage or system sleep states. |
| Operating Temp | –40°C to +85°C-qualified for consumer and industrial portable electronics environments. |
| Chemistry Support | Three preloaded profiles: CHEM_ID 0x1202 (4.2 V), 0x1210 (4.3 V), 0x354 (4.35 V)-selected via I²C command without reprogramming. |
Pinout & Package
Package: 9-pin YZF (DSBGA), 1.62 mm × 1.58 mm, 0.5 mm pitch, bottom-side ball layout. Designed for ultra-compact system-board integration with minimal footprint and no external components beyond decoupling capacitors.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | LDO input & battery voltage sense | Kelvin-connected to PACK+; requires 1 µF decoupling to VSS for measurement stability and LDO regulation. |
| BIN | Battery insertion detection input | Digital input with configurable pullup/pulldown; detects pack presence when [BIE]=1 or triggers host-managed insertion/removal events. |
| GPOUT | Configurable open-drain output | Signals BAT_LOW warning or SOC_INT interrupt; exits shutdown when toggled; requires 10-kΩ pullup to VDD. |
| SCL | I²C clock input | Open-drain; requires 10-kΩ pullup to VPU (1.62–3.6 V); supports 100/400 kHz timing compliance. |
| SDA | I²C data bidirectional line | Open-drain; shares same 10-kΩ pullup as SCL; handles all I²C read/write/quick/incremental protocols. |
| VDD | 1.8-V regulated output | Powers internal logic and may supply adjacent low-power peripherals; decoupled with 0.47 µF ceramic cap. |
| VSS | Ground reference | B2 is primary ground; C1 is floating but usable as top-layer bridge to PCB ground plane-no via required. |
Key Features
| Feature | Design Value |
|---|---|
| Dynamic Voltage Correlation Algorithm | Enables accurate SOC estimation without sense resistor-reducing BOM cost and PCB area while maintaining <±0.1% voltage error across –40°C to +85°C. |
| Integrated Temperature Sensing | On-die sensor eliminates external thermistor placement complexity and improves thermal response time for self-discharge compensation. |
| Multi-Chemistry Support | Three factory-programmed Li-ion profiles (4.2 V / 4.3 V / 4.35 V) selectable via I²C-no custom calibration or firmware modification needed. |
| Ultra-Low-Power Operation | 0.6 µA shutdown current extends shelf life of battery-powered devices; auto-wake on I²C activity or GPOUT toggle. |
| System-Side Architecture | Resides on host board-not inside battery pack-simplifying certification, enabling firmware updates, and supporting embedded or removable batteries. |
Applications
| Smartphones & Tablets | Digital Cameras |
|---|---|
|
Use Scenario: Real-time battery level reporting and low-battery warnings during video capture and display backlight operation. IC Role / Device Role / Timing Role: System-side fuel gauge providing filtered RemainingCapacity() and StateOfCharge() via I²C every 1–5 seconds. Use Value: Enables precise power budgeting and prevents unexpected shutdown during high-current discharge phases (e.g., flash LED, image sensor burst mode). |
Use Scenario: Accurate runtime estimation during continuous autofocus, image processing, and LCD/EVF usage. IC Role / Device Role / Timing Role: Host-controlled fuel gauge delivering InternalTemperature() and Voltage() at 2-Hz intervals to adjust power management algorithms. Use Value: Maintains ±1% SOC accuracy across wide temperature swings encountered in outdoor photography-critical for reliable "battery remaining" UI. |
| Handheld Terminals | MP3/Multimedia Players |
|
Use Scenario: Long-duration field operation with intermittent barcode scanning, wireless communication, and GPS. IC Role / Device Role / Timing Role: Low-power fuel gauge in HIBERNATE mode between scans; wakes on I²C poll to report RemainingCapacityUnfiltered(). Use Value: Achieves >1-year shelf life with 0.6 µA shutdown current while preserving SOC history through deep sleep cycles. |
Use Scenario: Portable audio playback with variable load (DAC, amplifier, Bluetooth) and ambient temperature variation. IC Role / Device Role / Timing Role: System-side gauge supplying EffectiveCurrent() and AveragePower() to dynamically scale CPU frequency and audio codec bias. Use Value: Extends playback time by 8–12% versus fixed-threshold fuel gauges through adaptive discharge modeling and self-discharge compensation. |
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, 1.8-V LDO, 400-kHz I²C-but uses Impedance Track™ algorithm requiring sense resistor and more complex calibration. | Requires PCB layout changes for sense resistor and Kelvin traces; higher BOM cost and firmware overhead. | Select when higher accuracy under dynamic load or multi-cell configurations is required-BQ27621YZFR-G1 preferred for cost-sensitive, single-cell, resistorless designs. |
| MAX17048G+T | 3.3-V supply only; no integrated LDO; 12-bit ADC resolution; supports 4.2-V chemistry only; different I²C address (0x6D). | Cannot operate directly from battery; lacks 4.3/4.35-V profile support; lower voltage measurement precision impacts SOC at low charge. | Choose only if existing design uses 3.3-V rail and 4.2-V cells exclusively-BQ27621YZFR-G1 offers broader voltage support and true system-side autonomy. |
Compared with BQ27426YZFT and MAX17048G+T, the BQ27621YZFR-G1 uniquely combines resistorless operation, triple-chemistry support, ultra-low shutdown current, and direct battery-powered LDO-all in a 1.62 × 1.58 mm CSP-making it optimal for space-constrained, single-cell consumer electronics where BOM simplicity and fast integration are priorities.
Availability
BQ27621YZFR-G1 is available at Aetrix Electronics and suitable for smartphones, digital cameras, handheld terminals, and multimedia players requiring stable component supply, long-term lifecycle assurance, and consistent parametric performance across production batches.
Supply support for BQ27621YZFR-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, embedded processing, and power management technologies, with leadership in battery management ICs since 2005.
The BQ27621YZFR-G1 belongs to TI's bq27xxx fuel gauge family designed specifically for system-side, single-cell Li-ion applications where minimal host intervention, ultra-low power, and resistorless architecture are essential.
FAQ
What is the primary function of the BQ27621YZFR-G1 in a battery management system?
The BQ27621YZFR-G1 serves as a system-side fuel gauge IC that estimates remaining capacity (mAh), state-of-charge (%), voltage (mV), and temperature (°C) for single-cell Li-ion batteries using TI's Dynamic Voltage Correlation algorithm-without requiring a current-sense resistor. It communicates results over I²C to the host processor and integrates a 1.8-V LDO powered directly from the battery, making the BQ27621YZFR-G1 ideal for compact, low-cost portable electronics.
Does the BQ27621YZFR-G1 require an external current-sense resistor?
No, the BQ27621YZFR-G1 does not require an external current-sense resistor. Its Dynamic Voltage Correlation algorithm derives state-of-charge and remaining capacity solely from battery voltage, temperature, and internal impedance modeling. This eliminates the need for sense resistors, associated Kelvin traces, and related layout complexity-significantly simplifying design and reducing BOM cost compared to traditional coulomb-counting gauges like the BQ27426YZFT.
How many battery chemistry profiles does the BQ27621YZFR-G1 support, and how are they selected?
The BQ27621YZFR-G1 supports three preloaded Li-ion chemistry profiles: CHEM_ID 0x1202 (4.2 V max charge), 0x1210 (4.3 V), and 0x354 (4.35 V). These are selected dynamically via I²C Control() subcommands ALT_CHEM1 or ALT_CHEM2-no firmware reprogramming or OTP writing is needed. The default profile (0x1202) activates at power-up, and switching occurs in real time, allowing the BQ27621YZFR-G1 to adapt to different battery types within the same hardware platform.
What is the minimum supply current of the BQ27621YZFR-G1 in shutdown mode?
The BQ27621YZFR-G1 draws just 0.6 µA in SHUTDOWN mode, as specified in the datasheet's Supply Current section. This ultra-low quiescent current preserves battery charge during extended storage or system hibernation. The device exits shutdown either via I²C bus activity or a toggle on the GPOUT pin-ensuring responsive wake-up without compromising energy efficiency. This value is confirmed across –40°C to +85°C operating conditions.
Can the BQ27621YZFR-G1 be used with both embedded and removable battery packs?
Yes, the BQ27621YZFR-G1 supports both embedded and removable battery configurations. For removable packs, the BIN pin detects insertion/removal using a pulldown resistor on the pack and a pullup on the system board. For embedded batteries, BIN is tied to VSS with [BIE]=1 enabled. In both cases, the BQ27621YZFR-G1 resides on the system board-not inside the pack-enabling easier certification, firmware updates, and compatibility with standardized battery interfaces.
BQ27621YZFR-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
BQ27621YZFR-G1A FAQ
1.How can I place an order for BQ27621YZFR-G1A through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27621YZFR-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 BQ27621YZFR-G1A reliable?
The price and inventory of BQ27621YZFR-G1A are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27621YZFR-G1A is usually 5 days.
3.What payment methods are accepted for BQ27621YZFR-G1A?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27621YZFR-G1A transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27621YZFR-G1A?
BQ27621YZFR-G1A orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27621YZFR-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 BQ27621YZFR-G1A?
For technical support, including BQ27621YZFR-G1A datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27621YZFR-G1A requirements.
6.How does Aetrix verify that BQ27621YZFR-G1A is sourced from the original manufacturer or authorized distributors?
All BQ27621YZFR-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 BQ27621YZFR-G1A meets industry standards.
7.What is the process for return or replacement of BQ27621YZFR-G1A?
All BQ27621YZFR-G1A units undergo pre-shipment inspection (PSI). If there is an issue with BQ27621YZFR-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 BQ27621YZFR-G1A part is unused and in its original packaging.
Return procedure for BQ27621YZFR-G1A:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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