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Texas Instruments BQ27505YZGR-J5
- Part No.:
- BQ27505YZGR-J5
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-UFBGA, DSBGA
- Datasheet:
-
BQ27505YZGR-J5.pdf
- Description:
- IC BATT FUEL GAUGE LIION 12DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,352
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Product details
Overview
BQ27505YZGR-J5 from Texas Instruments is a system-side Li-ion battery fuel gauge IC for single-cell packs, delivering <1% state-of-charge (SOC) error via Impedance Track™ algorithm, 14-bit coulomb counting with ±10 µV input offset, and integrated temperature sensing. It resides on the host main board and interfaces via 400-kHz I²C to report remaining capacity (mAh), time-to-empty (min), voltage (mV), temperature (°C), and state of health (%).
For engineers reviewing the BQ27505YZGR-J5 datasheet, BQ27505YZGR-J5 pinout, BQ27505YZGR-J5 application, or BQ27505YZGR-J5 equivalent, this page provides verified technical context, real-world design meaning of specifications, validated pin functions, confirmed alternatives, and supply support for portable electronics design cycles requiring accurate, low-power battery monitoring.
Technical Context
The BQ27505YZGR-J5 implements Texas Instruments' proprietary Impedance Track™ algorithm to model battery discharge curves, dynamically adjusting for aging, self-discharge, and temperature/rate inefficiencies using real-time voltage, current, and thermistor inputs. Its dual-oscillator architecture combines 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) for precise timing in fuel gauging and power mode transitions.
It operates across five power modes-NORMAL (114 µA), SLEEP+ (58 µA), SLEEP (19 µA), HIBERNATE (4 µA), and BAT INSERT CHECK-with automatic mode switching triggered by events like charge/discharge activity or thermistor detection. The device supports both external NTC thermistor (10.0 kΩ @ 25°C) and internal temperature sensing, with dedicated ADC channels for TS and BAT inputs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.4 V to 2.6 V - tight regulation required; deviation beyond limits disables fuel gauging accuracy and triggers power-on reset at 2.09–2.31 V threshold. |
| Coulomb Counter Resolution | 14–15 bits - enables sub-mAh remaining capacity resolution with ±10 µV input offset, critical for <1% SOC error over battery lifetime. |
| I²C Interface Speed | 400 kHz - supports fast host polling of real-time parameters (e.g., TTE, SOC, voltage) without bus contention in resource-constrained systems. |
| Operating Temperature | –40°C to +85°C - validated for smartphone, PDA, and handheld terminal environments where thermal gradients impact battery modeling fidelity. |
| Data Flash Retention | 10 years - preserves calibrated battery profiles, chemistry IDs, and learned Qmax values across product lifecycle without external EEPROM. |
| Sense Resistor Range | 5 mΩ to 20 mΩ - allows use of ultra-low-value shunts to minimize power loss (<10 mW at 2 A), essential for high-efficiency portable designs. |
| Power Modes | NORMAL, SLEEP+, SLEEP, HIBERNATE, BAT INSERT CHECK - enables adaptive current draw from 114 µA down to 4 µA, extending system standby time. |
Pinout & Package
Package: 12-ball NanoFree™ CSP (2.43 mm × 1.96 mm, 0.5 mm pitch), optimized for space-constrained mobile PCBs with minimal thermal resistance (θJA = 115°C/W).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRP / SRN | Coulomb counter analog inputs | Differential sense inputs for 5–20 mΩ shunt; ±0.125 V common-mode range ensures accurate current integration during charge/discharge cycles. |
| BAT | Cell voltage measurement input | ADC input with 0–5 V range; used for OCV sampling and impedance modeling-requires no external level-shifting for standard Li-ion voltages. |
| TS | Thermistor voltage sense | Analog input for 10.0 kΩ NTC (e.g., Semitec 103AT); 8 MΩ effective input resistance minimizes loading error on thermistor divider network. |
| BI/TOUT | Battery insertion detection & thermistor mux control | Configurable I/O that powers thermistor network and detects pack presence; requires >1 MΩ pull-up for reliable insertion sensing. |
| /BAT_GD | Battery-good indicator | Active-low push-pull output signaling valid battery connection and voltage within operational range; polarity configurable via Operation Configuration register. |
| SOC_INT | State-of-charge interrupt | Open-drain output generating pulses when SOC crosses user-defined thresholds-enables host wake-up without continuous polling. |
| SDA / SCL | I²C serial interface | Open-drain data/clock lines compatible with 400 kHz operation; require 10 kΩ pull-ups to VCC for noise-immune communication with host MCU. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Delivers <1% SOC error across operating conditions and battery aging by modeling discharge curves using real-time voltage, current, and temperature inputs-not just voltage lookup tables. |
| Integrated Temperature Sensing | Supports both external 10.0 kΩ NTC thermistor and internal sensor; temperature data directly feeds fuel gauging and protection logic, eliminating need for separate thermal IC. |
| 96-Byte Non-Volatile FLASH | Stores battery profile, chemistry ID, and learned parameters (e.g., Qmax, Ra table); retains calibration data for 10 years without backup power or external memory. |
| Low-Power Operation | HIBERNATE mode draws only 4 µA-reduces system quiescent current during long-term storage while preserving battery state awareness. |
| Configurable Interrupt Outputs | BAT_LO and SOC_INT outputs support programmable polarity and thresholds, enabling flexible host wake-up and low-battery warning without firmware polling overhead. |
Applications
| Smartphone Battery Management | Digital Camera Power Monitoring |
|---|---|
|
Use Scenario: Real-time tracking of remaining runtime and battery health during video capture, flash charging, and display backlight modulation. IC Role / Device Role / Timing Role: System-side fuel gauge providing SOC, TTE, and SOH via I²C; triggers SOC_INT at 15% and 5% thresholds for UI alerts and graceful shutdown. Use Value: Enables accurate battery percentage display and predictive low-power warnings-reducing unexpected shutdowns during critical recording sessions. |
Use Scenario: Monitoring battery capacity degradation across repeated charge cycles in compact digital still/video cameras with removable Li-ion packs. IC Role / Device Role / Timing Role: Embedded fuel gauge on mainboard interfacing with removable battery via PACK+/PACK−/T pins; reports SOH (%) and FCC (mAh) to camera firmware. Use Value: Allows camera UI to display "battery wear" status and recommend replacement after 300+ cycles-improving user trust and serviceability. |
| Handheld Terminal Runtime Estimation | MP3 Player Low-Power Optimization |
|
Use Scenario: Predicting remaining operational time under variable load (RF scanning, barcode reading, GPS) in industrial handheld terminals. IC Role / Device Role / Timing Role: Fuel gauge supplying TTEatConstantPower (TTECP) and AveragePower (mW) values every 2 seconds via I²C; supports dynamic CPU throttling decisions. Use Value: Extends field-use duration by 12–18% through intelligent power budgeting-based on actual battery impedance rather than fixed voltage thresholds. |
Use Scenario: Enabling ultra-low-power sleep states in portable multimedia players during audio playback pauses or screen-off periods. IC Role / Device Role / Timing Role: Entering HIBERNATE mode (4 µA) when player is idle; waking host MCU via SOC_INT upon reaching 10% SOC or thermistor-detected temperature rise. Use Value: Reduces average system standby current by 75% versus always-on polling-extending shelf life from 3 weeks to >3 months. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT | Same 12-ball CSP package, but uses newer Impedance Track v2 algorithm with improved cold-temperature accuracy; lacks internal temperature sensor. | Requires external thermistor for all temperature-dependent gauging; better suited for cost-sensitive designs where external sensing is already present. | Select BQ27426YZFT if upgrading legacy BQ27505-based designs and external thermistor infrastructure exists; not drop-in due to register map differences. |
| MAX17048G+T | 10-pin µDFN package (3 mm × 3 mm); ModelGauge™ m3 algorithm; no integrated LDO; requires external 1.8–3.6 V supply. | Higher pin count and different footprint; supports wider input voltage range but adds external regulator complexity. | Choose MAX17048G+T for designs needing broader VCC flexibility or tighter board-level integration with other Maxim PMICs-requires layout revision. |
Compared with BQ27505YZGR-J5, the BQ27426YZFT offers enhanced low-temperature modeling but removes internal thermal sensing, while the MAX17048G+T trades package size for supply voltage flexibility and demands additional power conditioning-neither is pin-compatible, and both require firmware adaptation for command register access.
Availability
BQ27505YZGR-J5 is available at Aetrix Electronics and suitable for smartphone battery management, digital camera power monitoring, handheld terminal runtime estimation, and MP3 player low-power optimization requiring stable component supply across multi-year production cycles.
Supply support for BQ27505YZGR-J5 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 BQ27505YZGR-J5 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for system-side, single-cell Li-ion applications demanding high-accuracy runtime prediction and minimal host MCU firmware overhead.
FAQ
What is the primary function of the BQ27505YZGR-J5 in a portable electronics design?
The BQ27505YZGR-J5 serves as a system-side Li-ion battery fuel gauge IC that accurately reports remaining capacity (mAh), state-of-charge (%), time-to-empty (min), voltage (mV), temperature (°C), and state of health (%) using Texas Instruments' Impedance Track™ algorithm. It resides on the host main board-not inside the battery pack-and communicates via I²C, reducing firmware development effort while maintaining <1% SOC error across battery aging and temperature variation. The BQ27505YZGR-J5 eliminates the need for host-based gauging logic.
Does the BQ27505YZGR-J5 require an external sense resistor, and what value range is supported?
Yes, the BQ27505YZGR-J5 requires an external low-value sense resistor between PACK– and system ground to measure charge/discharge current. It supports resistor values from 5 mΩ to 20 mΩ, enabling precise coulomb counting with ±10 µV input offset and 14–15-bit resolution. This range allows designers to balance measurement accuracy against power loss-e.g., a 10 mΩ resistor dissipates only 40 mW at 2 A, making it ideal for power-sensitive portable devices using the BQ27505YZGR-J5.
How does the BQ27505YZGR-J5 handle temperature measurement for fuel gauging?
The BQ27505YZGR-J5 supports two temperature sensing methods: an external 10.0 kΩ NTC thermistor (e.g., Semitec 103AT) connected to the TS and BI/TOUT pins, or its internal temperature sensor. When using an external thermistor, a 18.2 kΩ pull-up resistor between BI/TOUT and TS is required. Temperature data directly feeds the Impedance Track™ algorithm to compensate for rate inefficiencies and aging effects-ensuring accurate SOC and SOH reporting across –40°C to +85°C ambient ranges in the BQ27505YZGR-J5.
What power-saving modes does the BQ27505YZGR-J5 support, and how low does current consumption go?
The BQ27505YZGR-J5 supports five power modes: NORMAL (114 µA), SLEEP+ (58 µA), SLEEP (19 µA), HIBERNATE (4 µA), and BAT INSERT CHECK. HIBERNATE mode draws only 4 µA-ideal for long-term storage or deep-sleep states-while retaining battery state awareness and enabling wake-up via SOC_INT or thermistor events. Mode transitions occur automatically based on system activity or can be commanded via I²C, allowing fine-grained power optimization in battery-powered devices using the BQ27505YZGR-J5.
Is the BQ27505YZGR-J5 pin-compatible with other TI fuel gauge ICs like the BQ27426?
No, the BQ27505YZGR-J5 is not pin-compatible with the BQ27426 or other TI fuel gauges. Although both use 12-ball NanoFree™ CSP packages, their pin assignments differ-for example, the BQ27426 relocates the TS and BI/TOUT functions and omits the internal temperature sensor path present in the BQ27505YZGR-J5. Any migration requires PCB layout changes and firmware adaptation due to differences in register maps, command sets, and feature implementation-even though both implement Impedance Track™ technology.
BQ27505YZGR-J5 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-J5 FAQ
1.How can I place an order for BQ27505YZGR-J5 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27505YZGR-J5 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-J5 reliable?
The price and inventory of BQ27505YZGR-J5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27505YZGR-J5 is usually 5 days.
3.What payment methods are accepted for BQ27505YZGR-J5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27505YZGR-J5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27505YZGR-J5?
BQ27505YZGR-J5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27505YZGR-J5 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-J5?
For technical support, including BQ27505YZGR-J5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27505YZGR-J5 requirements.
6.How does Aetrix verify that BQ27505YZGR-J5 is sourced from the original manufacturer or authorized distributors?
All BQ27505YZGR-J5 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-J5 meets industry standards.
7.What is the process for return or replacement of BQ27505YZGR-J5?
All BQ27505YZGR-J5 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27505YZGR-J5, 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-J5 part is unused and in its original packaging.
Return procedure for BQ27505YZGR-J5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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