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Texas Instruments BQ27Z746YAHR
- Part No.:
- BQ27Z746YAHR
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-XFBGA, DSBGA
- Datasheet:
-
BQ27Z746YAHR.pdf
- Description:
- PACK-SIDE, SINGLE-CELL IMPEDANCE
- Quantity:
- Payment:
- Shipping:
Inventory:1,608
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Product details
Overview
BQ27Z746YAHR from Texas Instruments is a flash-programmable, single-cell Li-ion battery gas gauge and hardware protection IC featuring Impedance Track™ technology, dual 16-bit ADCs (coulomb counting and voltage/temperature sensing), SHA-256 authentication, and I²C interface operating down to 2.0V. It delivers accurate time-to-empty estimation and real-time state-of-charge reporting for compact portable electronics.
For engineers reviewing the BQ27Z746YAHR datasheet, BQ27Z746YAHR pinout, BQ27Z746YAHR application, or BQ27Z746YAHR equivalent, this page provides verified technical context, validated pin functions, confirmed low-power modes (SHIP: 10μA, SHUTDOWN: 0.2μA), exact protection thresholds (OVP: 4525mV factory default), and authentic alternative part comparisons - all extracted from TI's official SLUSDW2D production datasheet (Feb 2026 revision).
Technical Context
The BQ27Z746YAHR integrates a custom TI BQBMP RISC CPU with on-chip flash memory for firmware updates and secure SHA-256 authentication. Its dual-ADC architecture separates high-precision coulomb counting (SRP/SRN inputs, 1mΩ sense resistor support) from independent cell voltage (BAT), pack voltage (PACK), and temperature (TS, GPO/TS1) measurement paths.
Hardware protection includes N-channel high-side FET drivers (CHG/DSG), factory-trimmed overvoltage (4525mV) and undervoltage (2300mV) detection, configurable overcurrent thresholds (±16mV default), and firmware-based overtemperature trip points (e.g., TOTC_TRIP: 55.0°C). Kelvin-sense BAT_SP/BAT_SN outputs provide differential analog cell voltage with selectable buffer modes and fault detection.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage Range | 2.0V–5.5V - enables operation directly from low-voltage Li-ion cells without external LDO |
| Coulomb Counter ADC Resolution | 16-bit - supports ±32.768A current range with 1mΩ sense resistor for high-accuracy charge tracking |
| Protection OVP Threshold | 4525mV (factory trimmed) - precise hardware overvoltage cutoff prevents cell damage during charging |
| Ultra-Low Power Modes | SHIP mode: 10μA, SHUTDOWN: 0.2μA - extends shelf life and reduces parasitic drain in storage |
| I²C Interface Speed | 400kHz - compatible with standard fast-mode I²C controllers for efficient host communication |
| Cell Sensing Output Accuracy | ±7mV (RLO mode) - ensures reliable battery voltage monitoring for fuel gauging and safety decisions |
| Flash Endurance | Data Flash: 20,000 write cycles - sufficient for field calibration and firmware updates across product lifetime |
Pinout & Package
Package: 15-ball NanoFree™ DSBGA (YAH), body size 1.69mm × 2.57mm, 0.4mm max height.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SRP / SRN | Coulomb counter analog inputs | Differential current sense pair accepting up to ±100mV input; supports 1mΩ shunt for ±32.768A full-scale range |
| BAT_SP / BAT_SN | Kelvin-sense cell voltage outputs | Differential analog output with programmable buffer modes (BUF/RLO) and ±200mV fault detection thresholds |
| CHG / DSG | N-channel high-side FET gate drivers | Drive external MOSFETs with 2×VDD output swing; support hardware OVP/UVP/OCD/OCC/SCD protection |
| PACK | Pack voltage sense input | Connects via 5kΩ resistor to PACK+; enables voltage-based protection and charge termination logic |
| TS / GPO/TS1 | Thermistor input / dual-function pin | Internal 18kΩ pullup enables NTC reading; configurable as general-purpose output or secondary temperature channel |
| SCL / SDA | I²C serial interface | Open-drain, 400kHz-compatible bus pins requiring external 10kΩ pullups; support SHA-256 authentication handshake |
| VDD / VSS | LDO input / ground | VDD accepts 2.0–5.5V; internal 1.8V LDO powers core logic; 1µF decoupling capacitor required at VDD |
| ENAB | Active-low wake enable | Pulled up internally to VDD (1MΩ); driving to PACK– wakes device from SHIP mode without host intervention |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ modeling | Real-time discharge curve adaptation for ±1% SOC accuracy across aging, temperature, and load variations |
| Integrated protection logic | Hardware-enforced OVP/UVP/OCD/OCC/SCD with configurable delays (e.g., tSCD = 244µs default) and firmware-overridable thresholds |
| Dual 16-bit ADC architecture | Independent coulomb counting (SRP/SRN) and voltage/temperature (BAT/TS/GPO/TS1) measurement paths eliminate cross-talk and timing conflicts |
| Secure firmware execution | SHA-256 authentication engine validates firmware integrity before flash programming, preventing unauthorized code injection |
| Ultra-low power states | Five distinct power modes (NORMAL/SLEEP/SHIP/SHELF/SHUTDOWN) with sub-1µA shutdown current for long-term storage |
Applications
| Smartphones | Tablets |
|---|---|
Use Scenario: Real-time battery state-of-charge and time-to-empty display during video playback and cellular connectivity. IC Role / Device Role / Timing Role: Primary fuel gauge and hardware protector managing charge/discharge cycles, thermal limits, and voltage safety margins. Use Value: Enables accurate battery percentage reporting and prevents unsafe overvoltage conditions using factory-trimmed 4525mV OVP threshold. | Use Scenario: Multi-tasking with background GPS, Wi-Fi, and display backlight under varying ambient temperatures. IC Role / Device Role / Timing Role: Dual-ADC-based coulomb counter and temperature-compensated Impedance Track™ estimator. Use Value: Maintains ±1% SOC accuracy across –40°C to 85°C via adaptive modeling and internal/external thermistor inputs (TS + GPO/TS1). |
| Portable Medical Wearables | Industrial Handheld Scanners |
Use Scenario: Continuous ECG monitoring with Bluetooth LE transmission and low-power sleep between readings. IC Role / Device Role / Timing Role: Ultra-low-power gas gauge enabling SHIP mode (10μA) during device idle periods while retaining calibrated state. Use Value: Extends shelf life and eliminates need for battery reconditioning prior to deployment due to 0.2μA SHUTDOWN current. | Use Scenario: Rugged barcode scanning in warehouse environments with frequent drop events and wide temperature swings. IC Role / Device Role / Timing Role: Hardware-level short-circuit (SCD) and overcurrent (OCD/OCC) protection with 244µs fault response. Use Value: Prevents MOSFET failure during accidental battery terminal shorts using factory-trimmed –20mV SCD threshold and dedicated CHG/DSG drivers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauging and protection applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27Z561YFFR | 15-ball DSBGA package, identical Impedance Track™ algorithm, but lacks SHA-256 authentication and has lower OVP accuracy (±50mV vs. ±15mV) | No cryptographic security for firmware updates; suitable for cost-sensitive consumer devices without security requirements | Select BQ27Z561YFFR only when SHA-256 authentication and tighter OVP tolerance are not required |
| BQ28Z610YFFR | Supports 2-series Li-ion packs, higher voltage range (up to 8.4V), adds SMBus 2.0 interface, but consumes 35μA in SLEEP mode (vs. 20μA) | Designed for multi-cell battery management systems; incompatible with single-cell topologies without redesign | Choose BQ28Z610YFFR only for 2S battery configurations requiring extended voltage range and SMBus compatibility |
Compared with BQ27Z746YAHR, BQ27Z561YFFR offers reduced security and precision for lower cost, while BQ28Z610YFFR targets multi-cell systems with higher voltage and different communication protocol - neither is pin-compatible, and both require PCB layout changes and firmware adaptation.
Availability
BQ27Z746YAHR is available at Aetrix Electronics and suitable for smartphones, tablets, and portable medical wearables requiring stable component supply, long-term lifecycle support, and certified battery safety compliance.
Supply support for BQ27Z746YAHR 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 50 years of innovation in battery management systems.
The BQ27Z746YAHR belongs to TI's Impedance Track™ gas gauge product line, engineered specifically for high-accuracy, secure, single-cell Li-ion battery monitoring and hardware protection in space-constrained portable electronics.
FAQ
What is the factory-trimmed overvoltage protection (OVP) threshold for the BQ27Z746YAHR?
The BQ27Z746YAHR has a factory-trimmed hardware OVP threshold of 4525mV with ±15mV accuracy at 25°C. This value is stored in one-time-programmable memory and can be adjusted via firmware configuration in FULL ACCESS mode, though field recalibration is required if modified from default. The BQ27Z746YAHR uses this threshold to disable the CHG FET driver immediately upon detecting pack voltage exceeding the limit.
Does the BQ27Z746YAHR support SHA-256 authentication, and how is it implemented?
Yes, the BQ27Z746YAHR integrates a dedicated SHA-256 authentication engine that verifies firmware integrity before flash programming. During update, the host sends a challenge-response sequence; the BQ27Z746YAHR computes the hash using its private key and returns the signature. This prevents unauthorized firmware modification and ensures only authenticated code executes on the BQ27Z746YAHR device.
What is the minimum sense resistor value supported by the BQ27Z746YAHR for coulomb counting?
The BQ27Z746YAHR supports current sense resistors as low as 1mΩ, enabled by its high-gain coulomb counter ADC with ±100mV input range. With a 1mΩ shunt, the BQ27Z746YAHR achieves ±32.768A full-scale current measurement while maintaining 1mA resolution. Lower resistance values would reduce measurable current range and increase noise susceptibility, making 1mΩ the practical minimum for optimal accuracy.
How does the BQ27Z746YAHR achieve ultra-low power consumption in SHIP mode?
The BQ27Z746YAHR enters SHIP mode by disabling non-essential circuitry including the LFO oscillator, ADC conversions, and I²C interface while retaining RAM state and wake-up capability. It draws just 10μA typical from the battery, enabled by internal clock gating and optimized biasing. Wake-up occurs when ENAB is pulled low (e.g., connected to PACK–), allowing the BQ27Z746YAHR to resume full operation without external reset.
Can the BQ27Z746YAHR monitor battery temperature using two independent sensors?
Yes, the BQ27Z746YAHR supports dual temperature sensing: TS pin reads an external NTC thermistor with internal 18kΩ pullup, while GPO/TS1 serves as a second thermistor input channel with identical pullup. Both channels feed into separate ADC paths, enabling simultaneous monitoring of cell temperature and pack ambient - critical for accurate Impedance Track™ modeling and overtemperature protection (TOTC/TOTD) in the BQ27Z746YAHR.
BQ27Z746YAHR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 15-XFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Fuel Gauge
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 1
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-DSBGA (1.7x2.6)
BQ27Z746YAHR FAQ
1.How can I place an order for BQ27Z746YAHR through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27Z746YAHR 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 BQ27Z746YAHR reliable?
The price and inventory of BQ27Z746YAHR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27Z746YAHR is usually 5 days.
3.What payment methods are accepted for BQ27Z746YAHR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27Z746YAHR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27Z746YAHR?
BQ27Z746YAHR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27Z746YAHR 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 BQ27Z746YAHR?
For technical support, including BQ27Z746YAHR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27Z746YAHR requirements.
6.How does Aetrix verify that BQ27Z746YAHR is sourced from the original manufacturer or authorized distributors?
All BQ27Z746YAHR 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 BQ27Z746YAHR meets industry standards.
7.What is the process for return or replacement of BQ27Z746YAHR?
All BQ27Z746YAHR units undergo pre-shipment inspection (PSI). If there is an issue with BQ27Z746YAHR, 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 BQ27Z746YAHR part is unused and in its original packaging.
Return procedure for BQ27Z746YAHR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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