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Texas Instruments BQ27425YZFT-G1
- Part No.:
- BQ27425YZFT-G1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-UFBGA, DSBGA
- Datasheet:
-
BQ27425YZFT-G1.pdf
- Description:
- IC FUEL GAUG COBLT OX 1C 15DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:179
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Product details
Overview
BQ27425YZFT-G1 from Texas Instruments is a system-side Impedance Track™ fuel gauge IC for single-cell LiCoO₂ battery packs, featuring integrated 10 mΩ sense resistor, I²C interface, on-chip LDO (2.5 V), and internal temperature sensor. It delivers real-time state-of-charge (%), remaining capacity (mAh), voltage (mV), and state-of-health (%) with <2% SOC error across aging, temperature, and load conditions - deployed in smartphones and portable media players.
For engineers reviewing the BQ27425YZFT-G1 datasheet, BQ27425YZFT-G1 pinout, BQ27425YZFT-G1 application, or BQ27425YZFT-G1 equivalent, key selection considerations include its 15-pin CSP package (2.69 × 1.75 mm), ultra-low sleep current (23 µA), integrated coulomb counter with 14-bit ADC resolution, and support for battery insertion detection via BIN pin - all critical for space-constrained, battery-life-sensitive designs.
Technical Context
The BQ27425YZFT-G1 implements Texas Instruments' patented Impedance Track™ algorithm to model battery discharge curves dynamically, compensating for aging, self-discharge, and temperature/rate inefficiencies without host MCU intervention. Its integrated 10 mΩ sense resistor enables direct SRX-to-VSS current sensing with ±10 µV input offset and 1 s conversion time.
It operates in four power modes - INITIALIZATION, NORMAL (118 µA), SLEEP (23 µA), and HIBERNATE (8 µA) - with automatic transitions triggered by load events or host commands. The 2.5 V LDO (2.4–2.6 V output, 325 mV dropout) powers the core and supports direct battery-pack operation, while the I²C interface (400 kHz, 600 ns setup/hold) enables bidirectional communication with system microcontrollers.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | VREGIN: 2.7–4.5 V; enables direct connection to Li-ion pack (3.0–4.2 V typical) without external regulator |
| Integrated Sense Resistor | 10 mΩ typical; eliminates external shunt, reduces PCB area, and minimizes thermal drift impact on current measurement |
| ADC Resolution | 14-bit for coulomb counting (SRX), 14-bit for cell voltage (BAT); ensures <10 mAh capacity resolution at 2000 mAh full charge |
| I²C Interface Speed | 400 kHz standard-mode; compatible with most host MCUs and supports fast polling of SOC, voltage, and flags registers |
| Operating Temperature | –40°C to +85°C; validated for smartphone and PDA environments with internal temperature compensation |
| EEPROM Endurance | 100 k write cycles, 10-year data retention; stores calibration data, learned Qmax, and Ra tables for long-term accuracy |
| Power Modes | NORMAL (118 µA), SLEEP (23 µA), HIBERNATE (8 µA); enables >1-year shelf life with periodic wake-up for SOC updates |
Pinout & Package
Package: 15-pin CSP (YZF), 2.69 × 1.75 mm, 0.5 mm pitch - optimized for ultra-thin mobile devices with minimal board footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRX (B1) | Coulomb counter analog input | Connects to PACK–; measures voltage drop across integrated 10 mΩ resistor for precise current integration |
| VSS (C1) | Analog/digital ground | Reference node for SRX, BAT, and internal LDO; must be low-impedance path to minimize measurement error |
| VCC (D1) | LDO output supply | Provides regulated 2.5 V to internal circuitry; requires 1 µF ceramic decoupling to VSS |
| REGIN (E1) | LDO input | Accepts raw battery voltage (2.7–4.5 V); requires 0.1 µF ceramic decoupling to VSS |
| CE (D2) | Chip enable | Drives internal LDO off when low; enables system-level power gating for zero-quiescent shutdown |
| BAT (E2) | Cell voltage sense | ADC input for pack voltage measurement (0.05–1 V range after internal scaling); max 4.8 V absolute rating |
| SCL (A3) | I²C clock input | Open-drain, 10 kΩ pull-up required; defines timing for command/data transfers with host MCU |
| SDA (B3) | I²C data I/O | Open-drain, 10 kΩ pull-up required; carries all Standard/Extended Commands and register reads/writes |
| BIN (C3) | Battery insertion detect | Logic-high-to-low transition triggers battery presence flag; supports removable battery systems with optional internal pull-up |
| GPOUT (A2) | Configurable open-drain output | Programmable as SOC interrupt or battery-low indicator; sinks up to 1 mA, requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Real-time modeling of battery impedance vs. SOC/temperature/aging - achieves <2% SOC error over full life cycle without host firmware overhead |
| Integrated 10 mΩ Sense Resistor | Eliminates external shunt, reduces BOM count and layout sensitivity, and avoids thermal coupling errors common with discrete resistors |
| On-Chip 2.5 V LDO | Enables direct battery-powered operation; supports 5 mA load with 325 mV dropout - removes need for external regulator in space-constrained designs |
| Internal Temperature Sensor | –40°C to +85°C range with –2 mV/°C gain; provides real-time thermal input to Impedance Track™ without external thermistor or routing |
| Configurable SOC Interrupts | Two programmable thresholds (SOC1/SOCF) drive GPOUT - enables hardware-triggered low-battery warnings without MCU polling |
| EEPROM-Based Learning | Stores learned Qmax and resistance tables across power cycles; retains calibration data for accurate gauging after battery removal/reinsertion |
Applications
| Smartphone Power Management | Feature Phone Battery Monitoring |
|---|---|
Use Scenario: Real-time battery level display and low-power warning during active use and standby. IC Role / Device Role / Timing Role: System-side fuel gauge providing SOC%, remaining capacity, and voltage via I²C; triggers GPOUT interrupt at 5% SOC. Use Value: Enables accurate battery estimation across charge/discharge cycles and temperature swings - reducing unexpected shutdowns by >90% versus voltage-only methods. | Use Scenario: Basic battery status reporting and charging control in cost-sensitive voice-centric handsets. IC Role / Device Role / Timing Role: Standalone gas gauge interfacing with baseband processor; reads StateOfCharge() and Flags() every 30 seconds. Use Value: Delivers reliable SOC indication using integrated sense resistor and LDO - eliminates external components and reduces bill-of-materials by 3 parts per unit. |
| Digital Camera Energy Tracking | Handheld Terminal Runtime Estimation |
Use Scenario: Predicting remaining shot count and video recording time based on flash usage and LCD backlight load. IC Role / Device Role / Timing Role: Coulomb-counting fuel gauge measuring average current (AI) and power (AP); reports RemainingCapacity() and AveragePower(). Use Value: Provides dynamic runtime prediction with <3% error under pulsed loads - improves user experience versus fixed-capacity estimates. | Use Scenario: Industrial barcode scanners requiring multi-shift runtime with battery swap capability. IC Role / Device Role / Timing Role: Removable-pack fuel gauge using BIN pin for hot-swap detection; updates FullChargeCapacity() and StateofHealth() after each insertion. Use Value: Enables accurate SOH tracking across 500+ cycles - extends usable battery life by identifying degradation before field failure. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27441-G1 | Same Impedance Track™ engine but adds SHA-1 authentication, enhanced EEPROM security, and extended temperature range (–40°C to +105°C) | Required for secure battery authentication in OEM-certified replacement packs | Select BQ27441-G1 when cryptographic validation or extended thermal operation is mandatory |
| BQ27220 | Lower-cost variant with no integrated sense resistor; requires external 10–20 mΩ shunt and lacks internal LDO | Suitable for cost-optimized designs where PCB area and component count are less constrained | Choose BQ27220 only if external shunt placement and additional regulator are acceptable trade-offs |
Compared with BQ27441-G1, the BQ27425YZFT-G1 offers lower system cost and simpler layout but lacks security features; versus BQ27220, it reduces total solution size and power consumption by integrating both sense resistor and LDO - making it optimal for mainstream consumer portables.
Availability
BQ27425YZFT-G1 is available at Aetrix Electronics and suitable for smartphones, feature phones, and digital cameras requiring stable component supply, long-term lifecycle support, and consistent Impedance Track™ fuel gauging performance.
Supply support for BQ27425YZFT-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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in battery management systems.
The BQ27425YZFT-G1 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for high-accuracy, low-footprint battery monitoring in portable Li-ion applications - emphasizing ease of configuration and minimal host firmware dependency.
FAQ
What is the primary function of the BQ27425YZFT-G1 in a battery system?
The BQ27425YZFT-G1 serves as a system-side fuel gauge IC that accurately reports state-of-charge (%), remaining capacity (mAh), voltage (mV), and state-of-health (%) for single-cell LiCoO₂ batteries. It uses the Impedance Track™ algorithm with an integrated 10 mΩ sense resistor and internal temperature sensor - eliminating the need for external components while maintaining <2% SOC error across operating conditions. The BQ27425YZFT-G1 communicates via I²C and supports battery insertion detection through the BIN pin.
Does the BQ27425YZFT-G1 require an external sense resistor?
No, the BQ27425YZFT-G1 does not require an external sense resistor. It integrates a precision 10 mΩ sense resistor between the SRX and VSS pins, enabling direct current measurement without added PCB area, thermal drift, or layout sensitivity. This integration simplifies design, reduces BOM count, and improves long-term accuracy - confirmed in the datasheet's "Integrated Sense Resistor Characteristics" table (TYP = 10 mΩ, TA = 25°C).
What power modes does the BQ27425YZFT-G1 support, and how do they affect system battery life?
The BQ27425YZFT-G1 supports four power modes: NORMAL (118 µA), SLEEP (23 µA), HIBERNATE (8 µA), and INITIALIZATION. Automatic transitions occur based on load activity, but the host can force mode changes via Control() subcommands like SET_HIBERNATE. In HIBERNATE mode, current drops to 8 µA - extending shelf life and enabling multi-year operation in low-duty-cycle devices. All modes retain EEPROM-stored learning data, ensuring rapid resumption of accurate gauging upon wake-up.
Can the BQ27425YZFT-G1 operate without an external LDO regulator?
Yes, the BQ27425YZFT-G1 includes an integrated 2.5 V LDO powered from REGIN (2.7–4.5 V), allowing direct connection to the Li-ion battery pack. The LDO delivers up to 5 mA with 325 mV dropout and requires only a 0.1 µF input capacitor (REGIN–VSS) and 0.47–1 µF output capacitor (VCC–VSS). This eliminates the need for an external regulator - verified in the "2.5V LDO REGULATOR" section of the datasheet, where VREG25 = 2.4–2.6 V over temperature and load.
How does the BQ27425YZFT-G1 handle battery insertion and removal detection?
The BQ27425YZFT-G1 uses the BIN pin for battery insertion detection: a logic-high-to-low transition triggers the [BAT_DET] flag in the Flags() register. When OpConfig[BIE] = 1 (default), this detection is automatic; when disabled, the host must issue BAT_INSERT/BAT_REMOVE Control() subcommands. The internal pull-up option (enabled via [BI_PU_EN]) reduces system power consumption. This dual-mode capability supports both embedded and removable battery configurations - documented in the "PIN FUNCTIONS" and "Control(): 0x00/0x01" sections.
BQ27425YZFT-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 15-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Cobalt Oxide
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-DSBGA
BQ27425YZFT-G1 FAQ
1.How can I place an order for BQ27425YZFT-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27425YZFT-G1 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 BQ27425YZFT-G1 reliable?
The price and inventory of BQ27425YZFT-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27425YZFT-G1 is usually 5 days.
3.What payment methods are accepted for BQ27425YZFT-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27425YZFT-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27425YZFT-G1?
BQ27425YZFT-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27425YZFT-G1 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 BQ27425YZFT-G1?
For technical support, including BQ27425YZFT-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27425YZFT-G1 requirements.
6.How does Aetrix verify that BQ27425YZFT-G1 is sourced from the original manufacturer or authorized distributors?
All BQ27425YZFT-G1 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 BQ27425YZFT-G1 meets industry standards.
7.What is the process for return or replacement of BQ27425YZFT-G1?
All BQ27425YZFT-G1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27425YZFT-G1, 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 BQ27425YZFT-G1 part is unused and in its original packaging.
Return procedure for BQ27425YZFT-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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