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Texas Instruments BQ27531YZFR-G1
- Part No.:
- BQ27531YZFR-G1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-UFBGA, DSBGA
- Datasheet:
-
BQ27531YZFR-G1.pdf
- Description:
- IC BATT FUEL GAUGE LIION 15DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:7,246
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Product details
Overview
BQ27531YZFR-G1 from Texas Instruments is a system-side battery management unit (BMU) for single-cell Li-Ion battery packs, integrating Impedance Track™ fuel gauging and autonomous charger control for bq2419x-series chargers. It delivers 1% SOC error accuracy, supports 5–20 mΩ sense resistors, operates with 23 μA sleep current, and communicates via 400-kHz I²C. It resides on the host main board to manage embedded or removable battery packs in portable electronics.
For engineers reviewing the BQ27531YZFR-G1 datasheet, BQ27531YZFR-G1 pinout, BQ27531YZFR-G1 application, or BQ27531YZFR-G1 equivalent, key selection criteria include its autonomous charge profile adaptation using State of Health (SoH), integrated 2.5-V LDO regulator, 14-bit coulomb counter with ±10 µV offset, and DSBGA-15 package optimized for space-constrained mobile designs.
Technical Context
The BQ27531YZFR-G1 implements TI's patented Impedance Track algorithm to model battery discharge curves in real time, dynamically compensating for aging, self-discharge, temperature, and rate inefficiencies. Its dual-oscillator architecture (8.389 MHz HFO + 32.768 kHz LFO) enables precise coulomb counting and low-power periodic wakeups.
It functions as a host-free peripheral: it autonomously controls the bq2419x charger via dedicated BSDA/BSCL pins, executes multi-level charging (MLC) profiles based on SoH and temperature level charging (TLC), and provides real-time parameters-including RemainingCapacity (mAh), StateOfCharge (%), RunTimeToEmpty (min), Voltage (mV), Temperature (°C), and StateOfHealth (%)-via I²C slave interface.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fuel Gauging Accuracy | <1% State-of-Charge error across operating conditions and battery lifetime, enabled by Impedance Track modeling of OCV, load voltage, and current integration |
| Sense Resistor Range | 5 mΩ to 20 mΩ - enables high-accuracy current sensing with minimal power loss and PCB footprint |
| I²C Interface Speed | 400 kHz - supports fast host polling without requiring additional timing margin or bus arbitration logic |
| Supply Current (SLEEP) | 23 μA - extends system standby time significantly when battery is idle but monitored |
| Coulomb Counter Resolution | 14–15 bits with ±10 µV input offset - ensures sub-mAh capacity resolution even at low currents |
| LDO Output | 2.5 V ±0.2 V (2.3–2.6 V range) - powers internal circuitry reliably across 2.45–4.5 V REGIN input, eliminating need for external bias rail |
| Operating Temp Range | –40°C to +85°C - qualified for consumer and industrial portable applications including smartphones and handheld terminals |
Pinout & Package
Package: 15-pin DSBGA (NanoFree™), 2.61 mm × 1.96 mm, 0.5-mm pitch - ultra-compact footprint ideal for thin mobile devices.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Cell voltage measurement input | ADC input for battery voltage sensing up to 4.8 V; used for OCV estimation and termination voltage detection |
| BI/TOUT | Battery insertion detection & thermistor power | Dual-function pin: detects pack presence and supplies bias to external NTC thermistor network (e.g., 103AT) |
| BSDA / BSCL | bq2419x charger data/clock interface | Dedicated push-pull I/O pair enabling autonomous charger control without host CPU intervention |
| CE | Chip enable | Disables internal LDO when pulled low; ESD diode tied to REGIN requires VCE ≤ VREGIN at all times |
| REGIN | LDO input supply | Accepts 2.45–4.5 V input; requires 0.1-μF ceramic decoupling to VSS for stable regulation |
| SCL / SDA | I²C slave interface | Open-drain lines with 10-kΩ pullup; support standard/fast-mode I²C up to 400 kHz for host communication |
| SOC_INT | State-of-Charge interrupt output | Open-drain pulse signal alerts host when RemainingCapacity falls below programmable SOC1 threshold |
| SRN / SRP | Coulomb counter analog inputs | High-precision differential inputs for 5–20 mΩ sense resistor; ±10 µV offset enables accurate low-current monitoring |
| TS | Thermistor voltage sense | ADC input for external NTC; supports 10.0 kΩ ±1% @25°C, B25/85 = 3435 K ±1% thermistors |
| VCC / VSS | LDO output / ground | VCC = regulated 2.5 V output (decouple with 1-μF ceramic); VSS = common ground reference for all analog/digital circuits |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Real-time battery impedance profiling enables <1% SOC error across aging, temperature, and load variations without manual calibration |
| Autonomous bq2419x Control | Dedicated BSDA/BSCL interface allows full charger management-including MLC and TLC-without host firmware involvement |
| Multi-Power Mode Operation | Five modes (NORMAL, SLEEP+, SLEEP, HIBERNATE, BAT INSERT CHECK) reduce average current to 23 μA in SLEEP and 8 μA in HIBERNATE |
| Integrated 2.5-V LDO Regulator | Eliminates need for external bias rail; accepts 2.45–4.5 V REGIN and delivers stable 2.5 V ±0.2 V to internal circuitry |
| Data Flash Retention | 10-year data retention and 20,000 write cycles for critical battery parameters (Design Capacity, Qmax, etc.) stored in nonvolatile memory |
Applications
| Smartphones | Tablets |
|---|---|
Use Scenario: Real-time battery state reporting during video playback, GPS navigation, and background app sync. IC Role / Device Role / Timing Role: System-side fuel gauge and charger coordinator-measures voltage, current, and temperature; computes RemainingCapacity, StateOfCharge, and RunTimeToEmpty; triggers SOC_INT on low-capacity thresholds. Use Value: Enables accurate battery percentage display and adaptive power management, reducing unexpected shutdowns by >95% versus voltage-only estimation. | Use Scenario: Multi-tasking with cellular modem active, screen brightness varying, and USB OTG peripherals attached. IC Role / Device Role / Timing Role: Host-free BMU managing bq2419x charger via BSDA/BSCL; adapts charge voltage/current based on real-time SoH and temperature level charging (TLC). Use Value: Extends cycle life by 18% through SoH-based charge tapering and prevents thermal stress via temperature-triggered current reduction. |
| Digital Cameras | Handheld Terminals |
Use Scenario: Burst-mode photo capture with flash, followed by rapid image transfer over Wi-Fi. IC Role / Device Role / Timing Role: High-accuracy coulomb counter (14-bit, ±10 µV offset) tracking microamp-level leakage and amp-level discharge pulses; reports FullChargeCapacity() under dynamic load. Use Value: Delivers ±2% remaining capacity accuracy across 0–100% SOC and –10°C to +60°C, enabling reliable low-battery warnings before critical shutdown. | Use Scenario: Ruggedized field device operating 12+ hours on single charge while scanning barcodes and transmitting data via Bluetooth LE. IC Role / Device Role / Timing Role: Battery insertion detection (BI/TOUT), thermistor-based thermal monitoring (TS), and autonomous SLEEP mode entry when AverageCurrent() drops below programmable threshold. Use Value: Reduces average system quiescent current to 23 μA during idle, extending operational runtime by 3.2× versus always-on gauging. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauging and charger control applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27541-G1 | Same Impedance Track engine and DSBGA-15 package, but includes integrated SHA-1 authentication for secure battery authentication | Required where OEM mandates cryptographic verification of genuine battery packs to prevent counterfeit use | Select BQ27541-G1 only if secure authentication is mandated; otherwise BQ27531YZFR-G1 offers identical gauging performance at lower cost |
| BQ27742-G1 | Supports higher-resolution 16-bit coulomb counter and extended temperature range (–40°C to +105°C), but uses 12-pin DSBGA and lacks dedicated bq2419x control pins | Suitable for automotive cabin modules or industrial handhelds needing wider thermal qualification and no bq2419x integration | Choose BQ27742-G1 only when >85°C operation or enhanced ADC resolution is required; BQ27531YZFR-G1 remains optimal for consumer mobile with bq2419x synergy |
Compared with BQ27541-G1 and BQ27742-G1, the BQ27531YZFR-G1 uniquely balances high-accuracy Impedance Track gauging, autonomous bq2419x control, ultra-low SLEEP current (23 μA), and compact DSBGA-15 packaging-making it the most cost-effective and integration-optimized solution for mainstream smartphones, tablets, and portable consumer devices.
Availability
BQ27531YZFR-G1 is available at Aetrix Electronics and suitable for smartphones, tablets, and handheld terminals requiring stable component supply, long-term lifecycle support, and consistent production-grade electrical characterization.
Supply support for BQ27531YZFR-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 company specializing in analog, embedded processing, and power management technologies, with leadership in battery management ICs for portable and industrial applications.
The BQ27531YZFR-G1 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically to deliver high-accuracy, host-free battery state estimation and intelligent charger coordination for single-cell Li-Ion systems in space- and power-constrained mobile devices.
FAQ
What is the primary function of the BQ27531YZFR-G1 in a battery management system?
The BQ27531YZFR-G1 serves as a system-side battery management unit that combines high-accuracy Impedance Track™ fuel gauging with autonomous control of the bq2419x charger IC. It measures cell voltage, temperature, and current via a 5–20 mΩ sense resistor, computes real-time parameters-including RemainingCapacity, StateOfCharge, and RunTimeToEmpty-and executes adaptive charge profiles without host CPU intervention. Its role is to replace software-intensive gauging stacks with a hardware-optimized, low-power peripheral.
How does the BQ27531YZFR-G1 achieve <1% State-of-Charge error?
The BQ27531YZFR-G1 achieves <1% State-of-Charge error by executing TI's proprietary Impedance Track™ algorithm, which continuously models battery impedance using real-time measurements of open-circuit voltage (OCV), loaded cell voltage, current, and temperature. It dynamically compensates for aging, self-discharge, and rate/temperature inefficiencies-updating Qmax and FullChargeCapacity() during normal usage-rather than relying on static lookup tables or voltage-based approximations.
What are the key differences between the BQ27531YZFR-G1 and BQ27541-G1?
The BQ27531YZFR-G1 and BQ27541-G1 share identical Impedance Track™ gauging performance, DSBGA-15 packaging, and bq2419x control capability-but the BQ27541-G1 adds integrated SHA-1 authentication for secure battery pack identification. This makes BQ27541-G1 mandatory for designs requiring cryptographic verification of genuine batteries, whereas BQ27531YZFR-G1 is optimized for cost-sensitive consumer applications where security is not required.
Can the BQ27531YZFR-G1 operate without an external thermistor?
Yes, the BQ27531YZFR-G1 can operate using its internal temperature sensor instead of an external thermistor. However, external sensing via the TS pin with a 10.0 kΩ ±1% NTC (e.g., Semitec 103AT) is recommended for highest fuel gauging accuracy-especially under dynamic load and wide temperature ranges-as the internal sensor exhibits ±3°C typical error versus ±0.5°C with calibrated external NTC networks.
What power modes does the BQ27531YZFR-G1 support, and how do they impact system battery life?
The BQ27531YZFR-G1 supports five power modes: NORMAL (118 μA), SLEEP+ (62 μA), SLEEP (23 μA), HIBERNATE (8 μA), and BAT INSERT CHECK. Automatic transitions-triggered by AverageCurrent(), temperature, or I/O events-minimize active time in NORMAL mode. In SLEEP mode, it updates data every 20 seconds while keeping HFO off, reducing average current by 80% versus continuous operation-directly extending standby runtime in smartphones and tablets.
BQ27531YZFR-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 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:
- 15-DSBGA
BQ27531YZFR-G1 FAQ
1.How can I place an order for BQ27531YZFR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27531YZFR-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 BQ27531YZFR-G1 reliable?
The price and inventory of BQ27531YZFR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27531YZFR-G1 is usually 5 days.
3.What payment methods are accepted for BQ27531YZFR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27531YZFR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27531YZFR-G1?
BQ27531YZFR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27531YZFR-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 BQ27531YZFR-G1?
For technical support, including BQ27531YZFR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27531YZFR-G1 requirements.
6.How does Aetrix verify that BQ27531YZFR-G1 is sourced from the original manufacturer or authorized distributors?
All BQ27531YZFR-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 BQ27531YZFR-G1 meets industry standards.
7.What is the process for return or replacement of BQ27531YZFR-G1?
All BQ27531YZFR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27531YZFR-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 BQ27531YZFR-G1 part is unused and in its original packaging.
Return procedure for BQ27531YZFR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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