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Texas Instruments BQ27546YZFR-G1
- Part No.:
- BQ27546YZFR-G1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-UFBGA, DSBGA
- Datasheet:
-
BQ27546YZFR-G1.pdf
- Description:
- IC BATT FUEL GAUGE LI-ION 15DSBG
- Quantity:
- Payment:
- Shipping:
Inventory:2,428
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Product details
Overview
BQ27546YZFR-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 integrates coulomb counting, 14–15-bit ADCs for voltage/temperature/sense-resistor measurement, SHA-1/HMAC authentication, and 64-byte user-programmable data flash. It operates in battery packs for smartphones and tablets with 5–20 mΩ sense resistors.
For engineers reviewing the BQ27546YZFR-G1 datasheet, BQ27546YZFR-G1 pinout, BQ27546YZFR-G1 application, or BQ27546YZFR-G1 equivalent, key selection criteria include I²C/HDQ dual-interface support, –40°C to 85°C operating range, 23 µA FULLSLEEP current, 2.5-V LDO regulator output, and integrated tab disconnection/internal short detection for safety-critical portable power systems.
Technical Context
The BQ27546YZFR-G1 uses a proprietary Impedance Track™ algorithm that models battery impedance across temperature, aging, and load conditions to deliver <1% SoC error. Its dual-mode coulomb counter supports 14–15-bit resolution with ±10 µV input offset and 1 s conversion time on SRP/SRN inputs.
It features dual communication interfaces-open-drain I²C (400 kHz) and HDQ single-wire-with independent timing specs and shared register access. Power management includes four low-power modes (NORMAL, SLEEP, FULLSLEEP, HIBERNATE), with HIBERNATE drawing only 8 µA and FULLSLEEP 23 µA, triggered by current thresholds or host commands.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | REGIN: 2.45–4.5 V; VCC: –0.3–2.75 V - supports direct connection to Li-ion cell or regulated supply |
| Coulomb Counter Resolution | 14–15 bits - enables precise charge/discharge integration with ±10 µV input offset for <1% SoC error |
| ADC Input Ranges | SRP/SRN: ±125 mV; BAT: 0–5 V; TS: VSS–0.125 to VCC - accommodates 5–20 mΩ sense resistors and NTC thermistors |
| Communication Interfaces | I²C (400 kHz) and HDQ - provides flexible host connectivity with open-drain SDA/SCL and bidirectional HDQ |
| Power Modes | HIBERNATE (8 µA), FULLSLEEP (23 µA), SLEEP (62 µA), NORMAL (118 µA) - enables ultra-low-power operation during idle periods |
| Data Flash | 64 bytes (2 × 32-byte blocks) - stores calibration data, manufacturer info, and secure keys with 10-year retention |
| Authentication | SHA-1/HMAC engine - enables secure battery pack authentication using 128-bit secret key stored in protected memory |
Pinout & Package
Package: 15-ball Nano-Free™ DSBGA (2.61 mm × 1.96 mm), 0.4-mm pitch, suitable for space-constrained portable battery packs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRP / SRN | Analog current-sense inputs | Connect across 5–20 mΩ sense resistor between CELL– and PACK–; enable high-accuracy coulomb counting |
| BAT | Cell voltage ADC input | Measures battery voltage up to 5 V with 14–15-bit resolution for OCV-based SoC calculation |
| TS | Thermistor voltage sense | Supports 10 kΩ NTC (e.g., Semitec 103AT) for temperature-compensated fuel gauging |
| SDA / SCL | I²C data/clock (open-drain) | Require 10-kΩ pull-up to VCC; enable standard host microcontroller interface at 400 kHz |
| HDQ | Single-wire HDQ interface | Open-drain bidirectional line for low-pin-count communication with dedicated HDQ host |
| REGIN / VCC | LDO input/output | REGIN powers internal 2.5-V LDO; VCC supplies core logic - decoupling required (0.1 µF + 1.0 µF) |
| CE | Chip Enable | Pulls internal LDO offline when low - enables system-level power gating of BQ27546YZFR-G1 |
| SE | Shutdown Enable output | Push-pull signal indicating device shutdown state; used for external FET control or status monitoring |
| VSS | Ground reference | Primary analog/digital ground plane connection - must be low-impedance for ADC accuracy |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Delivers <1% state-of-charge error across battery lifetime by modeling aging, self-discharge, and temperature-rate inefficiencies |
| Dual-Interface Communication | Simultaneous I²C and HDQ support allows flexible host integration without protocol translation or additional components |
| Integrated Safety Detection | Real-time internal short and tab disconnection detection - triggers alerts before thermal runaway or mechanical failure |
| Secure Authentication Engine | On-chip SHA-1/HMAC coprocessor with write-only 128-bit key storage prevents cloning and ensures OEM battery authenticity |
| Autocalibration Routine | Automatic SRP/SRN offset correction during SLEEP mode entry (if temp 5–45°C) maintains long-term measurement integrity |
Applications
| Smartphones | Tablets |
|---|---|
Use Scenario: Integrated into sealed battery packs for flagship Android/iOS devices requiring precise runtime prediction and OEM authentication. IC Role / Device Role / Timing Role: Primary fuel gauge and security authenticator - reports SoC%, remaining mAh, TTE, and validates pack legitimacy via SHA-1 challenge-response. Use Value: Enables adaptive power management, prevents third-party battery substitution, and reduces firmware calibration overhead through Impedance Track™ self-learning. | Use Scenario: Mounted on mainboard or embedded battery assembly in 7–10 inch tablets with high-capacity Li-ion cells (≥6,000 mAh). IC Role / Device Role / Timing Role: System-level battery monitor - measures cell voltage, temperature, and current to compute FullChargeCapacity() and NominalAvailableCapacity(). Use Value: Supports dynamic screen brightness scaling and app suspension based on accurate time-to-empty, extending usable runtime by up to 12% versus voltage-only gauges. |
| Digital Cameras | Handheld Terminals |
Use Scenario: Used in DSLR/mirrorless camera battery grips where rapid discharge pulses demand accurate low-SOC estimation. IC Role / Device Role / Timing Role: High-fidelity coulomb counter - integrates current via SRP/SRN with 1 s conversion time and 14-bit resolution under burst loads. Use Value: Prevents unexpected shutdown during video recording by detecting true remaining capacity even after high-current flash or sensor readout events. | Use Scenario: Deployed in ruggedized industrial handhelds (e.g., barcode scanners, asset trackers) operating across –20°C to 60°C ambient. IC Role / Device Role / Timing Role: Environmental-aware fuel gauge - uses TS input with 103AT thermistor to compensate SoC for temperature-induced voltage hysteresis. Use Value: Maintains ±3% SoC accuracy across wide temperature swings, enabling reliable low-battery warnings and scheduled maintenance alerts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27542-G1 | Same Impedance Track™ engine but lacks HDQ interface; I²C-only; 12-bit coulomb counter resolution | Suitable for cost-sensitive designs where single-interface suffices and <1% SoC error is not mandatory | Select BQ27542-G1 only if HDQ is unused and 12-bit ADC resolution meets system accuracy requirements |
| BQ27510-G1 | Smaller 12-ball DSBGA package; no internal LDO; requires external 2.5-V supply; 64-byte flash retained | Targeted at ultra-thin battery packs with strict height constraints and existing regulated power rails | Choose BQ27510-G1 when board space is critical and external 2.5-V regulation is already available |
Compared with BQ27546YZFR-G1, BQ27542-G1 trades HDQ support and 15-bit ADC resolution for lower cost, while BQ27510-G1 eliminates the integrated LDO to reduce footprint - both require revalidation of thermal performance and authentication key programming flow.
Availability
BQ27546YZFR-G1 is available at Aetrix Electronics and suitable for smartphones, tablets, and digital cameras requiring stable component supply, long-term lifecycle support, and secure battery authentication capabilities.
Supply support for BQ27546YZFR-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 leader specializing in analog, embedded processing, and power management technologies with over 90 years of innovation history.
The BQ27546YZFR-G1 belongs to TI's battery fuel gauge product line, designed specifically for high-accuracy, secure, single-cell Li-ion battery monitoring in consumer and industrial portable electronics.
FAQ
What communication interfaces does the BQ27546YZFR-G1 support?
The BQ27546YZFR-G1 supports both I²C (400 kHz, open-drain SDA/SCL) and HDQ (single-wire, bidirectional) interfaces. I²C is enabled by default at power-up; HDQ requires configuration via I²C command. Both share the same register map and data flash access, allowing host systems to choose the optimal interface based on pin count and protocol stack constraints. The BQ27546YZFR-G1 does not support SPI or UART.
How does the BQ27546YZFR-G1 achieve <1% state-of-charge accuracy?
The BQ27546YZFR-G1 achieves <1% state-of-charge accuracy using Texas Instruments' patented Impedance Track™ algorithm, which dynamically models battery impedance across aging, temperature, and load conditions. It combines 14–15-bit coulomb counting (SRP/SRN), 14–15-bit ADC measurements (BAT, TS), and real-time autocalibration to correct for sense-resistor offset. This multi-parameter approach eliminates reliance on voltage-only estimation, delivering consistent accuracy over the full battery lifecycle - a capability confirmed in TI's SLUA450 application report and validated in BQ27546YZFR-G1 production testing.
What is the purpose of the SE pin on the BQ27546YZFR-G1?
The SE (Shutdown Enable) pin on the BQ27546YZFR-G1 is a push-pull output that signals the device's active/shutdown state. When the BQ27546YZFR-G1 enters HIBERNATE or FULLSLEEP mode, SE asserts low; it returns high upon wake-up. This pin is commonly used to control external protection FETs or notify the host system of fuel gauge activity status. Unlike CE (Chip Enable), which disables the internal LDO, SE provides observable feedback without affecting BQ27546YZFR-G1 power domain operation.
Can the BQ27546YZFR-G1 operate without an external sense resistor?
No, the BQ27546YZFR-G1 requires an external 5–20 mΩ sense resistor connected between SRP and SRN to perform coulomb counting. The device does not support voltage-only fuel gauging modes. Without this resistor, the BQ27546YZFR-G1 cannot measure current flow, rendering RemainingCapacity(), AverageCurrent(), and FullChargeCapacity() registers invalid. While BAT and TS inputs allow basic voltage/temperature monitoring, accurate SoC and runtime estimation depend entirely on SRP/SRN differential voltage acquisition.
What security features does the BQ27546YZFR-G1 provide for battery authentication?
The BQ27546YZFR-G1 integrates a hardware SHA-1/HMAC authentication engine that performs challenge-response verification using a 128-bit secret key stored in write-only memory. During authentication, the host sends a 160-bit challenge; the BQ27546YZFR-G1 computes and returns a 160-bit digest. The default key (0x0123456789ABCDEFFEDCBA9876543210) must be replaced and the device sealed before deployment to prevent cloning. This ensures only authorized battery packs operate with the host system - a requirement verified in TI's bqStudio evaluation software and documented in SLUUB74 Technical Reference Manual.
BQ27546YZFR-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
BQ27546YZFR-G1 FAQ
1.How can I place an order for BQ27546YZFR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27546YZFR-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 BQ27546YZFR-G1 reliable?
The price and inventory of BQ27546YZFR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27546YZFR-G1 is usually 5 days.
3.What payment methods are accepted for BQ27546YZFR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27546YZFR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27546YZFR-G1?
BQ27546YZFR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27546YZFR-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 BQ27546YZFR-G1?
For technical support, including BQ27546YZFR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27546YZFR-G1 requirements.
6.How does Aetrix verify that BQ27546YZFR-G1 is sourced from the original manufacturer or authorized distributors?
All BQ27546YZFR-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 BQ27546YZFR-G1 meets industry standards.
7.What is the process for return or replacement of BQ27546YZFR-G1?
All BQ27546YZFR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27546YZFR-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 BQ27546YZFR-G1 part is unused and in its original packaging.
Return procedure for BQ27546YZFR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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