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Texas Instruments BQ27505YZGT-J3
- Part No.:
- BQ27505YZGT-J3
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-UFBGA, DSBGA
- Datasheet:
-
BQ27505YZGT-J3.pdf
- Description:
- IC BATT FUEL GAUGE LIION 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:250
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Product details
Overview
BQ27505YZGT-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 (%) with <1% SOC error across operating life. It resides on the host system main board, interfaces via 400-kHz I²C, and uses only PACK+, PACK–, and thermistor (T) connections - enabling integration in smartphones, PDAs, and digital cameras.
For engineers reviewing the BQ27505YZGT-J3 datasheet, BQ27505YZGT-J3 pinout, BQ27505YZGT-J3 application, or BQ27505YZGT-J3 equivalent, key selection considerations include its 12-pin NanoFree™ CSP package, integrated coulomb counter with ±10 mV input offset, dual-oscillator architecture (2.097 MHz + 32.768 kHz), 4-μA hibernate current, and support for external NTC thermistor (10.0 kΩ, B25/85 = 3435 K) or internal temperature sensing.
Technical Context
The BQ27505YZGT-J3 implements Texas Instruments' patented Impedance Track™ algorithm to model battery discharge curves, dynamically adjusting for aging, self-discharge, and temperature/rate inefficiencies. It performs coulomb counting using a 14–15-bit integrating ADC with 1-s conversion time and supports configurable SOC interrupt thresholds and battery-good/battery-low push-pull outputs.
Its dual-oscillator design enables precise timing for fuel gauging: a high-frequency oscillator (2.097 MHz, ±4.5% over –40°C to 85°C) drives core computation, while a low-frequency oscillator (32.768 kHz, ±4% over same range) supports sleep-mode timing and temperature sampling. Power management includes five modes - NORMAL (114 μA), SLEEP+ (58 μA), SLEEP (19 μA), HIBERNATE (4 μA), and BAT INSERT CHECK - with automatic transitions triggered by load conditions or host commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Supply | 2.4 V to 2.6 V - tight regulation required for ADC accuracy and stable Impedance Track™ convergence |
| Coulomb Counter Input Range | ±0.125 V across sense resistor - supports 5–20 mΩ shunts for accurate current measurement up to ±5 A typical |
| I²C Interface | 400 kHz standard-mode - compatible with most microcontrollers without level-shifting; open-drain SDA/SCL require 10 kΩ pull-ups |
| Temperature Sensing | Internal sensor (–40°C to 85°C, –2 mV/°C gain) or external NTC (10.0 kΩ, B25/85 = 3435 K) via TS pin with 18.2 kΩ pull-up |
| Data Flash | 96 bytes non-volatile FLASH - stores battery profile, calibration data, and user blocks; 10-year retention, 20,000 write cycles |
| Power Modes | HIBERNATE draws 4 μA - extends system standby life; automatically entered after prolonged inactivity or commanded via CONTROL( ) subcommand |
| Operating Temp | –40°C to 85°C ambient - functional range extends to 100°C, supporting industrial and portable consumer environments |
Pinout & Package
The BQ27505YZGT-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 portable designs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRP / SRN | Coulomb counter analog inputs | Differential sense inputs for current measurement; connect across 5–20 mΩ shunt between PACK– and system ground |
| BAT | Cell voltage ADC input | Measures battery voltage up to 5 V; requires decoupling and limits to ≤4.8 V for full-scale accuracy |
| TS | Thermistor voltage sense | Analog input for external NTC network; supports 103AT-type thermistors with 18.2 kΩ pull-up to BI/TOUT |
| BI/TOUT | Thermistor bias & multiplexer control | Provides bias current for thermistor network; also functions as battery-insertion detection input when configured |
| SOC_INT | State-of-charge interrupt output | Open-drain signal pulsed on SOC threshold crossing; requires external pull-up for host wake-up or alert handling |
| BAT_GD / BAT_LOW | Push-pull status indicators | Active-low battery-good and active-high battery-low outputs; polarity configurable via Operation Configuration register |
| SDA / SCL | I²C bidirectional data/clock | Standard 400-kHz I²C interface; SDA is open-drain, SCL is input-only; both require 10 kΩ pull-ups to VCC |
| VSS / VCC | Ground and power supply | VSS is system ground reference; VCC requires ≥0.1 μF ceramic decoupling close to pin for noise-sensitive ADC operation |
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 rate effects |
| Integrated Dual Oscillators | 2.097 MHz HF oscillator for computation timing + 32.768 kHz LF oscillator for low-power sleep-state timing and periodic sampling |
| Configurable Interrupt Outputs | SOC_INT, BAT_GD, and BAT_LOW support programmable thresholds and polarity - enabling flexible host power management and UI alerts |
| Non-Volatile Calibration Storage | 96-byte data flash retains battery-specific profiles, coulomb counter offsets, and board calibration values across power cycles and firmware updates |
| Ultra-Low Hibernate Current | 4 μA hibernate mode minimizes quiescent drain during long-term storage or device off-states without losing fuel gauge state |
Applications
| Smartphone Battery Management | PDA Power Monitoring |
|---|---|
Use Scenario: Real-time battery status reporting and low-battery warning in handheld mobile devices with removable Li-ion packs. IC Role / Device Role / Timing Role: System-side fuel gauge residing on main PCB; measures PACK+, PACK–, and T terminals to compute SOC, TTE, and SOH without pack-side electronics. Use Value: Enables accurate battery percentage display and graceful OS shutdown before deep discharge, extending usable runtime and preventing unexpected power loss. |
Use Scenario: Runtime estimation and battery health tracking in enterprise-grade personal digital assistants with embedded batteries. IC Role / Device Role / Timing Role: Host-processor peripheral providing calibrated coulomb counting and temperature-compensated OCV modeling via I²C. Use Value: Delivers consistent run-time predictions across charge cycles and temperature gradients, improving user confidence and field service planning. |
| Digital Camera Power Analytics | Handheld Terminal Fuel Gauging |
Use Scenario: Predictive power management in digital still/video cameras where burst-mode current draw causes rapid voltage sag. IC Role / Device Role / Timing Role: Measures instantaneous current and cell voltage at 1-s intervals; applies Impedance Track™ to distinguish true capacity loss from transient voltage drop. Use Value: Prevents premature "low battery" warnings during high-current recording, increasing effective shot count per charge by up to 12%. |
Use Scenario: Reliable battery status feedback in ruggedized handheld terminals used in logistics and field service applications. IC Role / Device Role / Timing Role: Provides battery insertion detection (via BI/TOUT), battery-good signaling, and configurable SOC interrupts for embedded Linux or RTOS hosts. Use Value: Ensures robust hot-swap capability and eliminates false "no battery" errors during battery replacement in mission-critical scanning operations. |
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 12-ball NanoFree™ CSP package; newer firmware with enhanced Impedance Track™ v2.0 and improved low-temperature accuracy below 0°C | Requires updated host driver for extended command set; supports additional chemistries including LiFePO₄ | Preferred for new designs requiring broader temperature performance or multi-chemistry support |
| BQ27510-G3YZFT | Pin-compatible 12-ball CSP; adds integrated LDO (1.8 V output) and supports higher I²C speeds (1 MHz); 256-byte data flash | Eliminates need for external LDO in space-constrained systems; enables faster profile updates during manufacturing | Select when system-level power efficiency or production-line programming throughput is critical |
Compared with BQ27505YZGT-J3, the BQ27426YZFT offers improved low-temperature fuel gauging fidelity and expanded chemistry support, while the BQ27510-G3YZFT integrates an LDO and doubles data flash capacity - both retain identical pinout and core Impedance Track™ functionality but require firmware and layout validation for migration.
Availability
BQ27505YZGT-J3 is available at Aetrix Electronics and suitable for smartphone battery management, PDA power monitoring, digital camera power analytics, and handheld terminal fuel gauging requiring stable component supply across extended product lifecycles.
Supply support for BQ27505YZGT-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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The BQ27505YZGT-J3 belongs to TI's battery fuel gauge product line, designed specifically for system-side, single-cell Li-ion applications where space, accuracy, and low quiescent power are critical - targeting portable consumer electronics with embedded or removable battery packs.
FAQ
What is the primary function of the BQ27505YZGT-J3?
The BQ27505YZGT-J3 is a system-side fuel gauge IC that provides accurate real-time battery metrics - including remaining capacity (mAh), state-of-charge (%), time-to-empty (min), voltage (mV), temperature (°C), and state-of-health (%) - for single-cell Li-ion battery packs. It uses the Impedance Track™ algorithm and resides on the host main board, not inside the battery pack. The BQ27505YZGT-J3 requires only three external connections: PACK+, PACK–, and thermistor (T).
Does the BQ27505YZGT-J3 support external thermistors?
Yes, the BQ27505YZGT-J3 supports external NTC thermistors via the TS and BI/TOUT pins. It is optimized for 10.0 kΩ, B25/85 = 3435 K thermistors (e.g., Semitec 103AT), requiring an 18.2 kΩ pull-up resistor between BI/TOUT and TS. The BQ27505YZGT-J3 also includes an internal temperature sensor with –2 mV/°C gain, configurable via firmware to supplement or replace external sensing.
What power modes does the BQ27505YZGT-J3 support, and how low is its minimum current draw?
The BQ27505YZGT-J3 supports five power modes: NORMAL (114 μA), SLEEP+ (58 μA), SLEEP (19 μA), HIBERNATE (4 μA), and BAT INSERT CHECK. Its lowest operational current is 4 μA in HIBERNATE mode - achieved after prolonged inactivity or via host-commanded CONTROL( ) subcommand SET_HIBERNATE. This ultra-low quiescent current preserves battery energy during extended standby or storage.
Is the BQ27505YZGT-J3 pin-compatible with other TI fuel gauge ICs?
The BQ27505YZGT-J3 uses a 12-ball NanoFree™ CSP package (CSP-12) with a defined pinout per TI SLUS986A. While the BQ27426YZFT and BQ27510-G3YZFT share the same 12-ball footprint and mechanical dimensions, pin assignments differ - notably in SDA/SCL placement and thermistor interface routing. Therefore, the BQ27505YZGT-J3 is not pin-compatible with those variants; PCB redesign is required for substitution.
How does the BQ27505YZGT-J3 achieve <1% state-of-charge accuracy?
The BQ27505YZGT-J3 achieves <1% SOC accuracy through Texas Instruments' Impedance Track™ algorithm, which continuously models battery impedance using real-time voltage, current, temperature, and historical usage data. It compensates for aging, self-discharge, and temperature/rate inefficiencies - validated across charge cycles and operating conditions. The BQ27505YZGT-J3 combines this with a 14–15-bit integrating ADC, low-offset coulomb counter (±10 mV), and dual-oscillator timing stability to maintain precision throughout battery life.
BQ27505YZGT-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
BQ27505YZGT-J3 FAQ
1.How can I place an order for BQ27505YZGT-J3 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27505YZGT-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 BQ27505YZGT-J3 reliable?
The price and inventory of BQ27505YZGT-J3 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27505YZGT-J3 is usually 5 days.
3.What payment methods are accepted for BQ27505YZGT-J3?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27505YZGT-J3 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27505YZGT-J3?
BQ27505YZGT-J3 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27505YZGT-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 BQ27505YZGT-J3?
For technical support, including BQ27505YZGT-J3 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27505YZGT-J3 requirements.
6.How does Aetrix verify that BQ27505YZGT-J3 is sourced from the original manufacturer or authorized distributors?
All BQ27505YZGT-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 BQ27505YZGT-J3 meets industry standards.
7.What is the process for return or replacement of BQ27505YZGT-J3?
All BQ27505YZGT-J3 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27505YZGT-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 BQ27505YZGT-J3 part is unused and in its original packaging.
Return procedure for BQ27505YZGT-J3:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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