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Texas Instruments BQ27505YZGT-J2
- Part No.:
- BQ27505YZGT-J2
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-UFBGA, DSBGA
- Datasheet:
-
BQ27505YZGT-J2.pdf
- Description:
- IC BATT FUEL GAUGE LIION 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
BQ27505YZGT-J2 from Texas Instruments is a system-side Impedance Track™ fuel gauge IC for single-cell Li-ion battery packs, providing real-time state-of-charge (%), remaining capacity (mAh), time-to-empty (min), voltage (mV), temperature (°C), and state-of-health (%) with <1% SOC error across operating conditions. It resides on the host system main board-not inside the battery-and interfaces via 400-kHz I²C using only PACK+, PACK–, and T terminals.
For engineers reviewing the BQ27505YZGT-J2 datasheet, BQ27505YZGT-J2 pinout, BQ27505YZGT-J2 application, or BQ27505YZGT-J2 equivalent, key selection considerations include its 12-ball NanoFree™ CSP package (2.43 mm × 1.96 mm), ultra-low quiescent current (4 µA in Hibernate mode), integrated coulomb counter with 14–15-bit resolution, internal temperature sensor, and support for external NTC thermistor (10.0 kΩ, B25/85 = 3435 K).
Technical Context
The BQ27505YZGT-J2 implements Texas Instruments' patented Impedance Track™ algorithm to model battery discharge curves, automatically compensating for aging, self-discharge, and temperature/rate inefficiencies. It uses dual oscillators-a 2.097-MHz high-frequency oscillator (±4.5% error over –40°C to 85°C) and a 32.768-kHz low-frequency oscillator (±4% error)-to synchronize fuel gauging and power-mode transitions.
Its integrating ADC performs coulomb counting with ±10 µV input offset and 2.5 MΩ effective input resistance on SRP/SRN pins, while the auxiliary ADC measures TS (thermistor) and BAT (cell voltage) with 14–15-bit resolution, 125-ms conversion time, and configurable input ranges (–0.2 V to 1 V for TS; –0.125 V to 5 V for BAT).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4–2.6 V typical; enables stable operation with low-noise LDO regulation and 0.1 µF decoupling at VCC. |
| Quiescent Current | 4 µA in Hibernate mode; extends system standby life without compromising wake-up responsiveness. |
| Coulomb Counter Resolution | 14–15 bits; supports accurate charge/discharge integration over wide dynamic range with ±10 µV offset. |
| I²C Interface Speed | 400 kHz; compatible with standard system microcontroller I²C ports without clock stretching overhead. |
| Temperature Sensing | Internal sensor (–40°C to 85°C) + external NTC interface (10.0 kΩ, B25/85 = 3435 K); enables dual-source thermal validation. |
| Data Flash Endurance | 20,000 write cycles; sufficient for field calibration updates, chemistry configuration, and lifetime SOH logging. |
| Operating Temperature | –40°C to 85°C ambient; validated for smartphone, PDA, and handheld terminal environments. |
Pinout & Package
Package: 12-ball NanoFree™ CSP (YZG), 2.43 mm × 1.96 mm, 0.5 mm pitch, bottom-terminal layout optimized for minimal PCB footprint and thermal performance (θJA = 89°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRP | Analog input (coulomb counter +) | Connects to high-side of 5–20 mΩ sense resistor; enables precision current measurement with 2.5 MΩ input impedance. |
| SRN | Analog input (coulomb counter –) | Connects to low-side of sense resistor; differential pair with SRP achieves <1% SOC accuracy under load transients. |
| BAT_LOW | Digital output (push-pull) | Asserts active-high battery-low warning; polarity configurable via [BATL_POL] bit for direct MCU interrupt routing. |
| SOC_INT | Open-drain I/O | Generates programmable state-of-charge interrupt pulses per Table 5-5; requires external pull-up for host wake-up signaling. |
| BI/TOUT | I/O (thermistor control) | Drives thermistor network bias; supports 1.8 MΩ pull-up for reliable battery-insertion detection and NTC excitation. |
| TS | Analog input (NTC sense) | ADC input for 103AT-type thermistor; 8 MΩ input impedance minimizes self-heating error in temperature reporting. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Delivers <1% state-of-charge error across battery lifetime by modeling OCV, impedance, aging, and thermal effects-no user calibration required. |
| System-Side Architecture | Eliminates need for embedded fuel gauge in battery pack; reduces BOM cost and enables firmware updates via host I²C without pack disassembly. |
| Multi-Mode Power Management | Five autonomous power states (NORMAL, SLEEP+, SLEEP, HIBERNATE, BAT INSERT CHECK) reduce average current to ≤19 µA during idle. |
| Non-Volatile Configuration Storage | 96 bytes of data flash retain battery profile, design capacity, and chemical ID across power cycles-enabling plug-and-play replacement compatibility. |
| Integrated Safety Monitoring | Hardware-level BAT_GD (battery-good) and BAT_LOW outputs provide fail-safe status signals independent of host software execution. |
Applications
| Smartphone Battery Management | PDA Power Optimization |
|---|---|
Use Scenario: Real-time battery status display, adaptive screen brightness control, and low-battery shutdown sequencing in compact handheld platforms. IC Role / Device Role / Timing Role: System-side fuel gauge providing SOC, TTE, and SOH via I²C; triggers SOC_INT interrupts at user-configurable thresholds. Use Value: Enables <1% SOC accuracy across 500+ charge cycles and –10°C to 45°C ambient, improving user-reported battery life consistency by >30%. |
Use Scenario: Long-duration field operation with intermittent connectivity, requiring precise runtime estimation and graceful suspend/resume behavior. IC Role / Device Role / Timing Role: Host-located coulomb counter and temperature monitor; manages SLEEP+ and HIBERNATE modes autonomously during idle periods. Use Value: Reduces average system standby current to ≤58 µA (SLEEP+), extending unplugged operation from 12 to >28 hours without sacrificing wake latency. |
| Digital Camera Power Control | Handheld Terminal Fuel Gauging |
Use Scenario: Burst-mode video recording with rapid current draw spikes, demanding accurate instantaneous current and voltage tracking. IC Role / Device Role / Timing Role: High-resolution (14–15-bit) integrating ADC measuring SRP/SRN differential voltage; reports ICR( ) and VOLT( ) every 1 s. Use Value: Captures transient discharge events ≥2 A with <0.5% current measurement error, preventing premature low-battery false alarms during capture. |
Use Scenario: Ruggedized industrial terminal with hot-swappable battery packs and field-updatable chemistry profiles. IC Role / Device Role / Timing Role: Removable-pack interface using PACK+, PACK–, and T terminals; stores multiple chem IDs and calibration data in 96-byte flash. Use Value: Supports seamless battery replacement across 3+ Li-ion chemistries without host firmware changes-verified via CHEM_ID( ) and DF_CHECKSUM validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | Lower-cost variant with reduced data flash (32 B), no internal temperature sensor, and fixed 400-kHz I²C only (no 100-kHz fallback). | Targeted at cost-sensitive consumer electronics where external thermistor is mandatory and firmware update frequency is low. | Select BQ27426YZFT when flash storage, internal temp sensing, and multi-speed I²C are non-critical; verify thermistor bias network compatibility. |
| BQ27510-G3YZFT | Newer generation with enhanced Impedance Track™ v2.0, 200-kHz I²C option, and extended –40°C to 100°C functional range. | Designed for automotive infotainment and extended-temperature industrial devices requiring higher reliability certification. | Choose BQ27510-G3YZFT for designs needing AEC-Q200 alignment, wider thermal margin, or improved aging compensation beyond 800 cycles. |
Compared with BQ27505YZGT-J2, BQ27426YZFT trades flash capacity and internal sensing for lower unit cost, while BQ27510-G3YZFT upgrades thermal range and algorithm fidelity at higher complexity-neither is pin-compatible, requiring PCB layout revision and firmware adaptation.
Availability
BQ27505YZGT-J2 is available at Aetrix Electronics and suitable for smartphone battery management, PDA power optimization, digital camera power control, handheld terminal fuel gauging, and portable medical device monitoring requiring stable component supply and long-term lifecycle support.
Supply support for BQ27505YZGT-J2 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 battery management IP development.
The BQ27505YZGT-J2 belongs to TI's Impedance Track™ fuel gauge product line, engineered specifically for system-side, single-cell Li-ion applications where accuracy, small size, and firmware-upgradable battery models are critical.
FAQ
What is the primary function of the BQ27505YZGT-J2 in a battery-powered system?
The BQ27505YZGT-J2 serves as a system-side fuel gauge IC that accurately reports remaining capacity (mAh), state-of-charge (%), time-to-empty (min), voltage (mV), temperature (°C), and state-of-health (%) for single-cell Li-ion batteries. Unlike pack-integrated gauges, it resides on the host main board and communicates via I²C, enabling firmware updates and eliminating reliance on battery-pack intelligence.
Does the BQ27505YZGT-J2 require an external sense resistor, and what value range is supported?
Yes, the BQ27505YZGT-J2 requires an external low-value sense resistor between PACK– and system ground. It supports resistor values from 5 mΩ to 20 mΩ, with optimal accuracy achieved using 10 mΩ. The device's integrating ADC features ±10 µV input offset and 2.5 MΩ effective input resistance on SRP/SRN pins to minimize measurement error.
How does the BQ27505YZGT-J2 handle temperature measurement-with internal or external sensing?
The BQ27505YZGT-J2 supports both internal and external temperature sensing. Its internal sensor covers –40°C to 85°C and provides system-level thermal context. For battery-specific temperature, it interfaces with an external NTC thermistor (e.g., Semitec 103AT, 10.0 kΩ, B25/85 = 3435 K) via the TS and BI/TOUT pins, using a 1.8 MΩ pull-up resistor for accurate biasing and insertion detection.
What power modes does the BQ27505YZGT-J2 support, and how low is its minimum current draw?
The BQ27505YZGT-J2 supports five autonomous power modes: NORMAL, SLEEP+, SLEEP, HIBERNATE, and BAT INSERT CHECK. In HIBERNATE mode, its current draw drops to 4 µA-verified across –40°C to 85°C-making it suitable for ultra-low-power standby in portable electronics where battery drain must be minimized over weeks or months.
Is the BQ27505YZGT-J2 pin-compatible with other members of the BQ275xx family, such as the BQ27510?
No, the BQ27505YZGT-J2 is not pin-compatible with the BQ27510 or other BQ275xx variants. While all share the 12-ball NanoFree™ CSP package outline, pin assignments differ-for example, BAT_GD is on A2 in BQ27505YZGT-J2 but on C1 in BQ27510-G3YZFT. Any migration requires PCB layout revision and firmware register mapping updates.
BQ27505YZGT-J2 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 12-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:
- 12-DSBGA
BQ27505YZGT-J2 FAQ
1.How can I place an order for BQ27505YZGT-J2 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27505YZGT-J2 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 BQ27505YZGT-J2 reliable?
The price and inventory of BQ27505YZGT-J2 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27505YZGT-J2 is usually 5 days.
3.What payment methods are accepted for BQ27505YZGT-J2?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27505YZGT-J2 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27505YZGT-J2?
BQ27505YZGT-J2 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27505YZGT-J2 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 BQ27505YZGT-J2?
For technical support, including BQ27505YZGT-J2 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27505YZGT-J2 requirements.
6.How does Aetrix verify that BQ27505YZGT-J2 is sourced from the original manufacturer or authorized distributors?
All BQ27505YZGT-J2 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 BQ27505YZGT-J2 meets industry standards.
7.What is the process for return or replacement of BQ27505YZGT-J2?
All BQ27505YZGT-J2 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27505YZGT-J2, 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 BQ27505YZGT-J2 part is unused and in its original packaging.
Return procedure for BQ27505YZGT-J2:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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