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Texas Instruments BQ27505YZGR-J3
- Part No.:
- BQ27505YZGR-J3
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-UFBGA, DSBGA
- Datasheet:
-
BQ27505YZGR-J3.pdf
- Description:
- IC FUEL GAUGE LI-ION 1CL 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,677
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Product details
Overview
BQ27505YZGR-J3 from Texas Instruments is a system-side Impedance Track™ fuel gauge IC for single-cell Li-ion battery packs, providing real-time remaining capacity (mAh), state-of-charge (%), time-to-empty (min), voltage (mV), temperature (°C), and state-of-health (%). It interfaces via 400-kHz I²C, uses a 10 mΩ sense resistor, and resides on the host system main board-not inside the battery pack. It supports embedded or removable battery configurations in space-constrained portable electronics.
For engineers reviewing the BQ27505YZGR-J3 datasheet, BQ27505YZGR-J3 pinout, BQ27505YZGR-J3 application, or BQ27505YZGR-J3 equivalent, key selection considerations include its NanoFree™ CSP-12 package (2.43 mm × 1.96 mm), integrated coulomb counter with 14-bit resolution, internal temperature sensor (–40°C to 85°C operating range), configurable SOC interrupt, and support for battery insertion detection and low-battery warning signals.
Technical Context
The BQ27505YZGR-J3 implements Texas Instruments' patented Impedance Track™ algorithm to model battery discharge curves and dynamically adjust for aging, self-discharge, and temperature/rate inefficiencies-achieving <1% SOC error across lifetime and conditions. It performs dual ADC measurements: a 14-bit integrating ADC for current sensing (SRP/SRN) and a 14-bit ADC for thermistor (TS) and cell voltage (BAT) inputs.
It operates in five power modes-NORMAL (114 µA), SLEEP+ (58 µA), SLEEP (19 µA), HIBERNATE (4 µA), and BAT INSERT CHECK-with automatic transitions triggered by events like charge/discharge activity or host I²C polling. Its 96-byte non-volatile data flash stores battery profiles, calibration data, and manufacturer information, accessible via sealed/unsealed access modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 2.4 V to 2.6 V - Tight regulation required; decoupling with ≥0.1 µF ceramic capacitor at VCC pin essential for stable operation. |
| I²C Interface | 400 kHz standard-mode - Compatible with common microcontroller I²C peripherals; open-drain SDA/SCL require 10 kΩ pull-ups. |
| Coulomb Counter | 14-bit integrating ADC - Measures current via SRP/SRN differential input (±0.125 V range); supports 5–20 mΩ sense resistors. |
| Temperature Sensing | Internal sensor + external NTC thermistor (10.0 kΩ @ 25°C) - TS pin accepts thermistor divider; internal sensor provides backup reporting. |
| Power Modes | NORMAL (114 µA), HIBERNATE (4 µA) - Enables ultra-low-power battery monitoring during device sleep states without host intervention. |
| Data Retention | 10 years - Non-volatile data flash retains battery profile, calibration, and configuration even after power loss. |
| Operating Temp | –40°C to +85°C - Qualified for industrial and consumer portable applications including smartphones and handheld terminals. |
Pinout & Package
The BQ27505YZGR-J3 is housed in a 12-ball NanoFree™ CSP (CSP-12) package measuring 2.43 mm × 1.96 mm with 0.5 mm pitch, optimized for ultra-compact PCB layouts in mobile devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRP / SRN | Coulomb counter analog inputs | Differential sense inputs for current measurement; connect across 5–20 mΩ resistor between PACK– and system ground. |
| BAT | Cell voltage ADC input | Measures single-cell Li-ion voltage (0–5 V range); used for OCV estimation and fuel gauging accuracy. |
| TS | Thermistor voltage sense | ADC input for external NTC network (e.g., 103AT-type); enables temperature-compensated SOC and safety monitoring. |
| BI/TOUT | Battery insertion detection & thermistor bias | Provides power and control for thermistor multiplexer; detects pack presence when configured with >1 MΩ pull-up. |
| SOC_INT | State-of-charge interrupt output | Open-drain signal pulses on configurable SOC thresholds; used to wake host MCU or trigger UI alerts. |
| BAT_LOW / BAT_GD | Dedicated status outputs | Push-pull active-high BAT_LOW and active-low BAT_GD indicate low-voltage condition and pack health status. |
| SDA / SCL | I²C serial interface | Standard 400-kHz I²C bus lines; require external 10 kΩ pull-ups to VCC for reliable communication with host processor. |
| VCC / VSS | Power supply and ground | VCC must be tightly regulated (2.4–2.6 V); VSS is system ground reference for all analog and digital circuitry. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Delivers <1% state-of-charge error over battery lifetime by modeling impedance changes due to aging, temperature, and load rate. |
| Integrated Coulomb Counter | 14-bit resolution integrating ADC with ±0.034% FSR INL enables precise mAh accumulation without external precision op-amps. |
| Configurable Interrupts | SOC_INT, BAT_LOW, and BAT_GD outputs support programmable thresholds and polarity-reducing host polling overhead and power use. |
| Non-Volatile Data Flash | 96 bytes of user-accessible flash store battery chemistry ID, design capacity, full charge capacity, and calibration offsets-surviving power cycles. |
| Multi-Power Mode Architecture | Five autonomous power states (including 4 µA HIBERNATE) allow continuous fuel gauging with minimal impact on system standby current. |
Applications
| Smartphone Battery Management | Digital Camera Power Monitoring |
|---|---|
|
Use Scenario: Real-time battery level display, low-battery warnings, and accurate shutdown prediction during video capture or GPS navigation. IC Role / Device Role: System-side fuel gauge that communicates SOC, TTE, and SOH to application processor via I²C-no firmware driver development needed. Use Value: Enables precise battery UX (e.g., % remaining, minutes until empty) while supporting fast-charging protocols and thermal derating logic. |
Use Scenario: Managing power during burst-mode image capture, flash charging, and extended playback-where sudden current spikes affect runtime estimates. IC Role / Device Role: Host-board-mounted coulomb counter and voltage/temperature monitor that feeds calibrated data to camera SoC power manager. Use Value: Delivers sub-1% SOC accuracy under dynamic loads using Impedance Track™, eliminating need for periodic full-discharge recalibration. |
| Handheld Terminal Runtime Estimation | MP3 Player Battery Health Tracking |
|
Use Scenario: Field-deployed logistics scanners requiring 8+ hour runtime per charge, with battery degradation tracking across 2+ years of service life. IC Role / Device Role: Fuel gauge providing SOH (%) and FCC (mAh) metrics to fleet management firmware-enabling predictive battery replacement scheduling. Use Value: Tracks capacity fade and internal resistance growth autonomously, reducing field failure rates and warranty claims. |
Use Scenario: Portable audio players with user-replaceable batteries needing accurate "time remaining" during variable-bitrate playback and Bluetooth streaming. IC Role / Device Role: Low-power fuel gauge operating in SLEEP+ mode (58 µA) between playback sessions-maintaining SOC continuity without host wake-up. Use Value: Extends usable battery life by minimizing background current draw while preserving <1% gauging accuracy across charge cycles. |
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 CSP-12 package, but newer generation with enhanced Impedance Track™ v2, lower quiescent current (3 µA hibernate), and improved low-current accuracy. | Requires updated firmware for extended command set; supports tighter SOC tolerance (<0.5%) under light loads. | Preferred for new designs targeting longer battery life and higher accuracy-especially in always-on wearable or IoT edge devices. |
| BQ27510-G3YZFT | Pin-compatible CSP-12 variant with identical pinout and register map, but includes factory-programmed gas gauge parameters and enhanced ESD rating (4 kV HBM). | Reduces production calibration effort; supports faster time-to-market for battery pack integrators. | Recommended when pre-calibrated out-of-box performance and robustness against handling ESD are critical in high-volume manufacturing. |
Compared with BQ27505YZGR-J3, the BQ27426YZFT offers superior low-power operation and next-gen algorithm fidelity, while the BQ27510-G3YZFT delivers plug-and-play readiness and higher ESD immunity-both retain full software compatibility but address distinct design priorities: accuracy evolution versus production scalability.
Availability
BQ27505YZGR-J3 is available at Aetrix Electronics and suitable for smartphone battery management, handheld terminal runtime estimation, and digital camera power monitoring requiring stable component supply across multi-year production cycles.
Supply support for BQ27505YZGR-J3 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 leadership in battery management ICs.
The BQ27505YZGR-J3 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for high-accuracy, system-side battery monitoring in space-constrained portable electronics where embedded firmware overhead must be minimized.
FAQ
What is the primary function of the BQ27505YZGR-J3 in a battery-powered system?
The BQ27505YZGR-J3 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. It resides on the host main board-not inside the battery-and uses TI's Impedance Track™ algorithm to deliver <1% SOC error across operating conditions and battery lifetime. The BQ27505YZGR-J3 eliminates the need for complex host-side gauging firmware by providing ready-to-use metrics via I²C.
Does the BQ27505YZGR-J3 require an external sense resistor, and what value is recommended?
Yes, the BQ27505YZGR-J3 requires an external current-sense resistor connected between PACK– and system ground. The datasheet specifies a range of 5 mΩ to 20 mΩ, with 10 mΩ being the typical recommendation. This resistor interfaces directly with the SRP and SRN pins, feeding the 14-bit integrating ADC. Using a low-value resistor minimizes power loss and thermal drift while maintaining sufficient signal for accurate coulomb counting in the BQ27505YZGR-J3.
Can the BQ27505YZGR-J3 operate with both embedded and removable battery packs?
Yes, the BQ27505YZGR-J3 is explicitly designed to support both embedded (non-removable) and removable battery pack configurations. It connects only to PACK+, PACK–, and T (thermistor) terminals-no direct connection to battery cells is required. The BI/TOUT pin enables battery insertion detection, and the device's architecture allows seamless integration whether the battery is soldered onto the PCB or hot-swappable via a connector. This flexibility is confirmed in the BQ27505YZGR-J3 datasheet Section 1.3 and Typical Application diagram.
What power modes does the BQ27505YZGR-J3 support, and how do they impact system power consumption?
The BQ27505YZGR-J3 supports five autonomous power modes: NORMAL (114 µA), SLEEP+ (58 µA), SLEEP (19 µA), HIBERNATE (4 µA), and BAT INSERT CHECK. These modes reduce current draw based on activity-e.g., entering HIBERNATE during prolonged idle periods while retaining flash-stored battery data. The BQ27505YZGR-J3 transitions automatically between modes or can be commanded by the host, enabling aggressive power savings without sacrificing fuel gauging continuity or accuracy.
Is the BQ27505YZGR-J3 pin-compatible with other members of the BQ275xx family?
No, the BQ27505YZGR-J3 is not fully pin-compatible with later BQ275xx variants such as the BQ27510-G3YZFT or BQ27541-G1YZFT. While all use the CSP-12 package, pin functions differ-for example, the BQ27510-G3 adds dedicated ALERT and QEN pins not present in the BQ27505YZGR-J3 pinout. The BQ27505YZGR-J3 pin assignment is fixed per Table 2-1 in SLUS986A, and substitution requires PCB layout revision unless verified as drop-in by TI documentation-which does not apply to this part.
BQ27505YZGR-J3 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
BQ27505YZGR-J3 FAQ
1.How can I place an order for BQ27505YZGR-J3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27505YZGR-J3 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 BQ27505YZGR-J3 reliable?
The price and inventory of BQ27505YZGR-J3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27505YZGR-J3 is usually 5 days.
3.What payment methods are accepted for BQ27505YZGR-J3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27505YZGR-J3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27505YZGR-J3?
BQ27505YZGR-J3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27505YZGR-J3 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 BQ27505YZGR-J3?
For technical support, including BQ27505YZGR-J3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27505YZGR-J3 requirements.
6.How does Aetrix verify that BQ27505YZGR-J3 is sourced from the original manufacturer or authorized distributors?
All BQ27505YZGR-J3 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 BQ27505YZGR-J3 meets industry standards.
7.What is the process for return or replacement of BQ27505YZGR-J3?
All BQ27505YZGR-J3 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27505YZGR-J3, 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 BQ27505YZGR-J3 part is unused and in its original packaging.
Return procedure for BQ27505YZGR-J3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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