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Texas Instruments BQ27425YZFR-G1
- Part No.:
- BQ27425YZFR-G1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-UFBGA, DSBGA
- Datasheet:
-
BQ27425YZFR-G1.pdf
- Description:
- IC BATT FUEL GAUGE LICO2 15DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,760
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Product details
Overview
BQ27425YZFR-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 temperature sensor, and 2.5 V LDO regulator. It delivers accurate state-of-charge (%), remaining capacity (mAh), and battery voltage (mV) with <1% typical SOC error across aging, temperature, and load conditions - deployed in smartphones and portable media players.
For engineers reviewing the BQ27425YZFR-G1 datasheet, BQ27425YZFR-G1 pinout, BQ27425YZFR-G1 application, or BQ27425YZFR-G1 equivalent, key selection considerations include integrated sense resistor tolerance (±15%), I²C timing compliance (400 kHz), sleep current (23 μA), HIBERNATE mode (8 μA), and CSP-15 package thermal resistance (θJB = 20 °C/W).
Technical Context
The BQ27425YZFR-G1 implements Texas Instruments' patented Impedance Track™ algorithm to model battery discharge curves in real time using coulomb counting (14-bit ADC), cell voltage (0.05–1 V input range), and internal temperature sensing (–40°C to 85°C). It supports dynamic impedance compensation for aging, self-discharge, and rate/temperature inefficiencies without host microcontroller intervention.
Its architecture integrates a 2.5 V LDO (2.4–2.6 V output, 5 mA max), configurable GPOUT for SOC interrupt or low-battery indication, and battery insertion detection via BIN pin with programmable pull-up. Power modes - NORMAL (118 μA), SLEEP (23 μA), and HIBERNATE (8 μA) - are automatically managed based on load current thresholds and system events.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage (REGIN) | 2.7–4.5 V - powers internal LDO; supports operation down to 2.45 V at reduced load (3 mA) |
| Integrated Sense Resistor | 10 mΩ typical - eliminates external shunt, reduces PCB area, enables direct PACK− connection at SRX |
| I²C Interface Speed | 400 kHz - standard Fast-mode timing; open-drain SDA/SCL with 10 kΩ pull-up support |
| ADC Resolution | 14–15 bits - applied to both coulomb counting (SRX) and cell voltage (BAT) measurements |
| Operating Temperature | –40°C to +85°C - qualified for consumer handhelds; internal temp sensor gain = –2 mV/°C |
| EEPROM Retention | 10 years - stores calibration data, design parameters, and learned Qmax/Ra tables |
| Power Modes | NORMAL (118 μA), SLEEP (23 μA), HIBERNATE (8 μA) - automatic transitions reduce system-level standby power |
Pinout & Package
CSP-15 package: 2.69 × 1.75 mm, 0.5 mm pitch, bottom-side ball array. Thermally optimized for PCB-mounted battery management with θJB = 20 °C/W and ψJB = 18 °C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRX | Coulomb counter analog input | Connects directly to PACK−; measures voltage drop across integrated 10 mΩ resistor (±40 mV full-scale) |
| VSS | Analog/digital ground | Common reference for sense resistor, ADC, and digital logic; must be low-impedance return path |
| VCC | LDO output supply | 2.5 V regulated output powering core logic; requires 1 μF decoupling to VSS |
| REGIN | LDO input | Accepts 2.7–4.5 V battery or system rail; 0.1 μF ceramic capacitor required between REGIN and VSS |
| CE | Chip enable | Active-high; disconnects LDO from REGIN when driven low to force shutdown |
| BAT | Cell voltage ADC input | Measures PACK+ voltage (0.05–1 V range after internal scaling); max 4.8 V absolute rating |
| SCL / SDA | I²C clock/data lines | Open-drain, 5.5 V tolerant; require external 10 kΩ pull-ups to VCC for proper bus signaling |
| BIN | Battery insertion detect | Logic high-to-low transition triggers BAT_DET flag; supports internal or external >1 MΩ pull-up |
| GPOUT | Configurable open-drain output | Programmable as SOC interrupt or battery-low indicator; sinks up to 1 mA |
| NC | No connect | Pins A1, B2, C2, D3, E3 - must remain unconnected per TI layout guidelines |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ algorithm | Delivers <1% typical SOC error over battery lifetime by modeling OCV, impedance, and temperature dependencies |
| Integrated 10 mΩ sense resistor | Eliminates external shunt, reduces BOM count, and avoids placement-induced measurement errors |
| On-chip temperature sensor | –40°C to +85°C range with –2 mV/°C gain - enables real-time thermal compensation without external thermistor |
| Configurable GPOUT | Supports dual-role operation (SOC_INT or BATT_LOW) via firmware register control, reducing GPIO usage |
| Multi-tier power management | Three autonomous low-power states (NORMAL/SLEEP/HIBERNATE) cut quiescent current to 8 μA without host polling |
Applications
| Smartphones | Feature Phones |
|---|---|
Use Scenario: Real-time battery level reporting during active screen use, call, and background app synchronization. IC Role / Device Role / Timing Role: System-side fuel gauge providing SOC%, remaining mAh, and SOH% via I²C to application processor. Use Value: Enables accurate low-battery warnings and adaptive power management, extending usable runtime by up to 8% vs. voltage-only estimation. | Use Scenario: Battery status display and charge termination control in cost-sensitive voice-centric handsets. IC Role / Device Role / Timing Role: Standalone fuel gauge interfacing with baseband SoC; handles all gauging math autonomously. Use Value: Reduces firmware development effort - no host-side Impedance Track™ implementation required. |
| Digital Cameras | Portable Media Players |
Use Scenario: Predicting remaining shot count and video recording time under variable flash and zoom loads. IC Role / Device Role / Timing Role: Coulomb-counting fuel gauge with fast transient response (1 s current update interval). Use Value: Maintains ±3% SOC accuracy during burst capture sequences where current spikes exceed 2.5 A peak. | Use Scenario: Runtime estimation during audio playback, FM radio, and Bluetooth streaming with mixed discharge profiles. IC Role / Device Role / Timing Role: Battery monitor with integrated LDO powering its own logic and supplying auxiliary 2.5 V rail. Use Value: Eliminates need for separate LDO, saving 0.5 mm² PCB area and simplifying power tree design. |
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 | Higher-accuracy Impedance Track™ (0.5% SOC), extended EEPROM (512 B), supports LiMn₂O₄ chemistry | Targeted at premium smartphones requiring tighter SOC tolerance and multi-chemistry flexibility | Select BQ27441-G1 only if sub-0.7% SOC error and LiMn₂O₄ support are mandatory; otherwise BQ27425YZFR-G1 offers optimal cost/performance balance |
| MAX17048 | ModelGauge™ m3 algorithm, 1.8 V min VDD, no integrated sense resistor (requires external 2–10 mΩ) | Used in ultra-low-voltage systems (e.g., wearables) where 2.5 V LDO is not needed and board space allows external shunt | Choose MAX17048 when operating below 2.7 V or when external sense resistor placement improves thermal isolation; BQ27425YZFR-G1 preferred for compact, single-rail designs |
Compared with BQ27441-G1 and MAX17048, the BQ27425YZFR-G1 provides best-in-class integration (sense resistor + LDO + temp sensor) for cost-sensitive, space-constrained LiCoO₂ applications - delivering production-ready accuracy without host firmware overhead or external components.
Availability
BQ27425YZFR-G1 is available at Aetrix Electronics and suitable for smartphones, portable media players, and digital cameras requiring stable component supply, long-term lifecycle support, and consistent parametric performance across manufacturing lots.
Supply support for BQ27425YZFR-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 over 50 years of innovation in precision analog ICs.
The BQ27425YZFR-G1 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for high-accuracy, low-footprint battery monitoring in portable consumer electronics with removable or embedded Li-ion cells.
FAQ
What is the primary function of the BQ27425YZFR-G1 in a battery management system?
The BQ27425YZFR-G1 serves as a system-side fuel gauge IC that accurately reports state-of-charge (%), remaining capacity (mAh), full charge capacity (mAh), and state-of-health (%) for single-cell LiCoO₂ batteries. It uses the Impedance Track™ algorithm with integrated 10 mΩ sense resistor and on-die temperature sensor to deliver <1% typical SOC error without host microcontroller computation - making the BQ27425YZFR-G1 ideal for smartphones and portable media devices.
Does the BQ27425YZFR-G1 require an external sense resistor?
No, the BQ27425YZFR-G1 does not require an external sense resistor. It integrates a precision 10 mΩ sense resistor (typical) between SRX and VSS, enabling direct connection to the battery PACK− terminal. This eliminates BOM cost, PCB layout complexity, and thermal drift issues associated with discrete shunts - a key differentiator of the BQ27425YZFR-G1 versus competing fuel gauges.
What power modes does the BQ27425YZFR-G1 support, and how do they impact system power consumption?
The BQ27425YZFR-G1 supports three autonomous power modes: NORMAL (118 μA), SLEEP (23 μA), and HIBERNATE (8 μA). Transitions occur automatically based on load current thresholds and system events - no host polling required. This reduces average system standby power significantly compared to continuously active gauges, making the BQ27425YZFR-G1 especially valuable in always-on portable devices where battery life is critical.
Can the BQ27425YZFR-G1 be used with battery chemistries other than LiCoO₂?
The BQ27425YZFR-G1 is factory-configured and characterized for single-cell LiCoO₂ batteries. While its Impedance Track™ algorithm is adaptable, TI does not specify or guarantee performance with LiMn₂O₄, LiFePO₄, or NMC chemistries. For multi-chemistry support, TI recommends the BQ27441-G1. Using the BQ27425YZFR-G1 outside its specified LiCoO₂ scope may result in degraded SOC accuracy and invalid SOH reporting.
How is battery insertion detection implemented on the BQ27425YZFR-G1?
Battery insertion detection on the BQ27425YZFR-G1 is handled via the BIN pin: a logic high-to-low transition triggers the [BAT_DET] flag in the Flags() register. The device supports either internal pull-up (enabled via OpConfig[BI_PU_EN]) or external >1 MΩ pull-up to VCC. When BIE=0, host software can force detection using BAT_INSERT/BAT_REMOVE subcommands - ensuring robust presence sensing in both embedded and removable battery configurations using the BQ27425YZFR-G1.
BQ27425YZFR-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
BQ27425YZFR-G1 FAQ
1.How can I place an order for BQ27425YZFR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27425YZFR-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 BQ27425YZFR-G1 reliable?
The price and inventory of BQ27425YZFR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27425YZFR-G1 is usually 5 days.
3.What payment methods are accepted for BQ27425YZFR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27425YZFR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27425YZFR-G1?
BQ27425YZFR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27425YZFR-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 BQ27425YZFR-G1?
For technical support, including BQ27425YZFR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27425YZFR-G1 requirements.
6.How does Aetrix verify that BQ27425YZFR-G1 is sourced from the original manufacturer or authorized distributors?
All BQ27425YZFR-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 BQ27425YZFR-G1 meets industry standards.
7.What is the process for return or replacement of BQ27425YZFR-G1?
All BQ27425YZFR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27425YZFR-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 BQ27425YZFR-G1 part is unused and in its original packaging.
Return procedure for BQ27425YZFR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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