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Texas Instruments BQ27546YZFT-G1
- Part No.:
- BQ27546YZFT-G1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-UFBGA, DSBGA
- Datasheet:
-
BQ27546YZFT-G1.pdf
- Description:
- IC BATT FUEL GAUGE LI-ION 15DSBG
- Quantity:
- Payment:
- Shipping:
Inventory:5,276
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Product details
Overview
BQ27546YZFT-G1 from Texas Instruments is a single-cell Li-ion battery fuel gauge IC implementing Impedance Track™ technology for accurate state-of-charge (SoC), remaining capacity (mAh), and time-to-empty estimation. It supports 5–20 mΩ sense resistors, integrates SHA-1/HMAC authentication, and operates in I²C or HDQ interface modes. It is designed for integration inside battery packs or on mainboards of space-constrained portable electronics.
For engineers reviewing the BQ27546YZFT-G1 datasheet, BQ27546YZFT-G1 pinout, BQ27546YZFT-G1 application, or BQ27546YZFT-G1 equivalent, key selection considerations include its 15-ball DSBGA package (2.61 mm × 1.96 mm), dual-interface support (I²C/HDQ), coulomb counter resolution (14–15 bits), low-power operating modes (down to 8 µA in HIBERNATE), and embedded temperature sensing with thermistor or internal sensor options.
Technical Context
The BQ27546YZFT-G1 uses a patented Impedance Track™ algorithm that models battery discharge curves by correlating cell voltage, current (via SRP/SRN differential sensing), and temperature to dynamically adjust for aging, self-discharge, and rate/temperature inefficiencies. Its integrating ADC provides 14–15-bit resolution for coulomb counting and 14–15-bit resolution for BAT/TS analog inputs.
It features dual communication interfaces - open-drain I²C (SCL/SDA, 400 kHz) and single-wire HDQ - both supporting secure SHA-1/HMAC authentication. Power management includes four operational modes (NORMAL, SLEEP, FULLSLEEP, HIBERNATE), with supply current ranging from 118 µA (NORMAL) to 8 µA (HIBERNATE), regulated by an internal 2.5-V LDO powered from REGIN.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Interface | I²C (400 kHz) and HDQ single-wire serial; enables host system communication without dedicated UART or SPI resources |
| Sense Resistor Range | 5 mΩ to 20 mΩ; allows high-accuracy current measurement with minimal power loss and board space |
| Coulomb Counter Resolution | 14–15 bits; delivers precise charge/discharge integration for sub-1% SoC error across battery lifetime |
| Operating Temp Range | –40°C to +85°C; qualified for consumer and industrial portable equipment environments |
| Supply Current (HIBERNATE) | 8 µA; extends battery pack shelf life and reduces parasitic drain during long idle periods |
| LDO Output | 2.5 V ±0.2 V (2.3–2.6 V); powers internal circuitry from 2.45–4.5 V REGIN input with 0.47 µF output capacitor |
| Data Flash | 64 bytes non-volatile FLASH (two 32-byte blocks); stores calibration data, manufacturer info, and security keys |
Pinout & Package
Package: 15-ball Nano-Free™ DSBGA (YZF), 2.61 mm × 1.96 mm, 0.4-mm pitch, bottom-side solder balls.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRP / SRN | Differential current-sense inputs | Connect across 5–20 mΩ sense resistor; enable high-precision coulomb counting with 10 µV offset and 1 s conversion time |
| BAT | Cell voltage ADC input | Measures single-cell Li-ion voltage up to 5 V with 14–15-bit resolution and 100 kΩ input impedance during measurement |
| TS | Thermistor voltage sense input | Supports 10 kΩ NTC (e.g., Semitec 103AT) for accurate pack temperature reporting; 8 MΩ input impedance when not measuring |
| SCL / SDA | I²C clock/data lines | Open-drain, require 10-kΩ pull-ups; support standard-mode (100 kHz) and fast-mode (400 kHz) I²C transactions |
| HDQ | Single-wire HDQ interface | Bi-directional, open-drain; enables minimal-pin-count communication with host using TI's HDQ protocol |
| REGIN / VCC | LDO input/output power rails | REGIN accepts 2.45–4.5 V; VCC delivers regulated 2.5 V to internal logic; decoupling requires 0.1 µF (REGIN–VSS) and 0.47–1 µF (VCC–VSS) |
| CE | Chip Enable control | Drives internal LDO off when low; reduces quiescent current during storage or system sleep |
| SE | Shutdown Enable output | Push-pull output signaling shutdown status; used for pack-level protection coordination |
| VSS | Ground reference | Primary analog/digital ground; must be low-impedance connection to battery pack negative terminal |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Delivers <1% SoC error across battery life by modeling OCV, load voltage, temperature, and aging effects in real time |
| SHA-1/HMAC Authentication | Enables secure battery pack identification and anti-counterfeiting via 128-bit secret key stored in protected flash |
| Internal Short & Tab Disconnection Detection | Monitors SRP/SRN and BAT/TS anomalies to flag unsafe mechanical or electrical failures before field failure |
| Autocalibration Engine | Automatically corrects SRP/SRN offset drift during SLEEP mode or after ≥256 mV voltage or ≥8°C temperature change |
| Lifetime Data Logging | Records cycle count, full charge cycles, and usage history in non-volatile memory for predictive maintenance and warranty analytics |
Applications
| Smartphones | Tablets |
|---|---|
Use Scenario: Real-time battery state reporting during multi-tasking, video playback, and cellular connectivity. IC Role / Device Role / Timing Role: Fuel gauge IC performing coulomb counting, SoC calculation, and authenticated communication with AP over I²C. Use Value: Enables accurate % battery display and low-battery warnings without user calibration, extending perceived runtime confidence. | Use Scenario: Long-duration media consumption with variable screen brightness and background app activity. IC Role / Device Role / Timing Role: Embedded fuel gauge providing RemainingCapacity(), TimeToEmpty(), and Temperature() via HDQ or I²C to PMIC or system controller. Use Value: Supports adaptive power management and thermal throttling decisions based on validated cell health metrics. |
| Digital Cameras | Handheld Terminals |
Use Scenario: Burst-mode photography with rapid flash charging and LCD preview, causing high transient current draw. IC Role / Device Role / Timing Role: Battery fuel gauge monitoring instantaneous current via SRP/SRN and compensating SoC for rate-dependent voltage sag. Use Value: Prevents premature "battery empty" shutdown during high-current events by distinguishing true depletion from voltage droop. | Use Scenario: Ruggedized industrial scanners operating in wide ambient temperatures (-20°C to 60°C). IC Role / Device Role / Timing Role: Integrated fuel gauge with internal temperature sensor and autocalibration, communicating over I²C to MCU under intermittent power. Use Value: Maintains SoC accuracy across temperature extremes and long storage intervals without manual recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27542YZFT-G1 | Same DSBGA-15 package and Impedance Track™ core, but firmware version 2.00 vs. 250; lacks tab disconnection detection | Targeted at cost-sensitive designs where advanced fault detection is not required | Select BQ27542YZFT-G1 only if SHA-1 authentication and tab disconnect detection are unnecessary |
| BQ27546YZFR-G1 | Identical electrical specs and firmware (v250), but shipped in tape-and-reel (3000 pcs) vs. BQ27546YZFT-G1's tray packaging | No functional difference; intended for automated SMT assembly rather than prototyping or low-volume integration | Choose BQ27546YZFR-G1 for high-volume production; BQ27546YZFT-G1 is preferred for evaluation and small-batch pack integration |
Compared with BQ27546YZFT-G1, the BQ27542YZFT-G1 offers reduced feature set at lower cost, while BQ27546YZFR-G1 provides identical functionality in alternate packaging-neither is pin-compatible with unrelated families like BQ27742 or BQ27623.
Availability
BQ27546YZFT-G1 is available at Aetrix Electronics and suitable for smartphones, tablets, digital cameras, and handheld terminals requiring stable component supply, long-term lifecycle support, and authentic TI-sourced fuel gauge ICs.
Supply support for BQ27546YZFT-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 solutions.
The BQ27546YZFT-G1 belongs to TI's bq27xxx fuel gauge product line, engineered specifically for high-accuracy, low-power, single-cell Li-ion battery state monitoring in portable consumer and industrial devices.
FAQ
What is the primary function of the BQ27546YZFT-G1?
The BQ27546YZFT-G1 is a single-cell Li-ion battery fuel gauge IC that accurately reports state-of-charge (SoC), remaining capacity (mAh), time-to-empty (minutes), voltage (mV), and temperature (°C) using TI's Impedance Track™ algorithm. It resides inside the battery pack or on the mainboard and communicates via I²C or HDQ. The BQ27546YZFT-G1 performs autonomous calibration, supports SHA-1 authentication, and detects internal faults such as short circuits or tab disconnection.
Does the BQ27546YZFT-G1 support both I²C and HDQ interfaces simultaneously?
No - the BQ27546YZFT-G1 is factory-configured for I²C operation (as indicated in the device comparison table), but it retains full HDQ capability and can be reconfigured to HDQ mode via firmware command. Both interfaces share the same physical pins (SCL/SDA mapped to HDQ functionality in HDQ mode), and only one interface is active at a time. The BQ27546YZFT-G1 does not operate both protocols concurrently.
What is the minimum sense resistor value supported by the BQ27546YZFT-G1?
The BQ27546YZFT-G1 supports sense resistors from 5 mΩ to 20 mΩ, with 5 mΩ being the minimum specified value. At 5 mΩ, a 1-A load produces only 5 mV across SRP–SRN - well within the ±125 mV input range and compatible with the device's 10 µV typical input offset. Using resistors below 5 mΩ risks violating the minimum differential voltage requirement for accurate coulomb counting in the BQ27546YZFT-G1.
How does the BQ27546YZFT-G1 handle battery temperature measurement?
The BQ27546YZFT-G1 supports two temperature sensing methods: external NTC thermistor (via TS pin, optimized for 10 kΩ 103AT-type) or internal die temperature sensor. The TS pin provides 14–15-bit ADC resolution with 8 MΩ input impedance when idle. Internal sensing is enabled via configuration register and avoids external components but reflects die temperature, not pack temperature. The BQ27546YZFT-G1 uses temperature data to correct SoC, aging, and impedance models in real time.
Is the BQ27546YZFT-G1 pin-compatible with other members of the bq275xx family?
Yes - the BQ27546YZFT-G1 shares the same 15-ball DSBGA (YZF) package, pinout, and footprint with BQ27542YZFT-G1, BQ27546YZFR-G1, and BQ27541YZFT-G1. All use identical SRP/SRN/BAT/TS/SCL/SDA/HDQ/REGIN/VCC/VSS/CE/SE assignments. However, firmware differences (e.g., v250 vs. v2.00) and feature enablement (e.g., tab disconnect detection) mean functional compatibility requires verification per application requirements. The BQ27546YZFT-G1 is not pin-compatible with larger-footprint variants like BQ27742.
BQ27546YZFT-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:
- HDQ, I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-DSBGA
BQ27546YZFT-G1 FAQ
1.How can I place an order for BQ27546YZFT-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27546YZFT-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 BQ27546YZFT-G1 reliable?
The price and inventory of BQ27546YZFT-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27546YZFT-G1 is usually 5 days.
3.What payment methods are accepted for BQ27546YZFT-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27546YZFT-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27546YZFT-G1?
BQ27546YZFT-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27546YZFT-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 BQ27546YZFT-G1?
For technical support, including BQ27546YZFT-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27546YZFT-G1 requirements.
6.How does Aetrix verify that BQ27546YZFT-G1 is sourced from the original manufacturer or authorized distributors?
All BQ27546YZFT-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 BQ27546YZFT-G1 meets industry standards.
7.What is the process for return or replacement of BQ27546YZFT-G1?
All BQ27546YZFT-G1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27546YZFT-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 BQ27546YZFT-G1 part is unused and in its original packaging.
Return procedure for BQ27546YZFT-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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