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Texas Instruments BQ27741YZFT-G1
- Part No.:
- BQ27741YZFT-G1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-UFBGA, DSBGA
- Datasheet:
-
BQ27741YZFT-G1.pdf
- Description:
- IC FUEL GAUGE LI-ION 1CL 15DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,463
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Product details
Overview
BQ27741YZFT-G1 from Texas Instruments is a single-cell Li-ion battery fuel gauge IC with integrated hardware protection, featuring Impedance Track™ algorithm for <1% state-of-charge error, 14.5-Ah capacity support, 15-ball NanoFree™ DSBGA (2.78 mm × 1.96 mm) package, and dual HDQ/I²C interface. It operates as a microcontroller-peripheral fuel gauging and protector inside battery packs for smartphones and portable electronics.
For engineers reviewing the BQ27741YZFT-G1 datasheet, BQ27741YZFT-G1 pinout, BQ27741YZFT-G1 application, or BQ27741YZFT-G1 equivalent, key selection criteria include coulomb counter resolution (14–15 bit), protection thresholds (e.g., 4.39 V OVP, 2.407 V UVP), thermal sensor gain (–2 mV/°C), and dual-interface timing compliance (I²C up to 400 kHz, HDQ cycle time ≤250 µs).
Technical Context
The BQ27741YZFT-G1 integrates a high-side 14–15-bit delta-sigma coulomb counter with ±10 µV input offset and 1-second conversion time, paired with dual ADCs for cell voltage (VBAT) and pack temperature (TS) measurement. Its protection logic implements independent overvoltage (OVP), undervoltage (UVP), overcurrent in charge/discharge (OCC/OCD), and short-circuit (SCD) detection with configurable delays (e.g., tOVP = 1 s, tSCD = 312.5 µs).
It embeds an 8.389-MHz HFO and 32.768-kHz LFO clock system, a 2.5-V LDO regulator (2.3–2.6 V output, 16 mA max), and voltage-doubler circuitry enabling high-side N-channel FET control (CHG/DSG drivers). Firmware resides in 96 bytes of user-programmable flash, partitioned into two 64-byte Manufacturer Info Blocks.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| OVP Threshold | 4.390 V - triggers hardware disconnect at cell overvoltage, with 1-s delay and 0.053-V temp drift over –40°C to 85°C |
| UVP Threshold | 2.407 V - initiates protection shutdown below minimum safe Li-ion voltage, with 31.25-ms delay |
| Coulomb Counter Resolution | 14–15 bits - enables sub-mAh capacity resolution across 14.5-Ah range using 5–20 mΩ sense resistor |
| I²C Clock Frequency | 400 kHz - supports standard-mode I²C communication with SCL low pulse ≥1.3 µs and rise/fall time ≤300 ns |
| HDQ Cycle Time | ≤250 µs - defines maximum host-to-gauge command interval for single-wire HDQ interface operation |
| LDO Output | 2.5 V ±0.2 V - powers internal processor and external peripherals; requires 1-µF ceramic decoupling on REG25 |
| Operating Temp Range | –40°C to +85°C - validated functional performance including protection timing and ADC accuracy across full range |
Pinout & Package
Package: 15-ball NanoFree™ DSBGA (YZF), body size 2.78 mm × 1.96 mm, 0.4-mm ball pitch, bottom-side solder termination.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Analog input | Direct cell-voltage sensing node; connects to Li-ion anode for accurate voltage monitoring and SOC calculation |
| SRP / SRN | Analog inputs | High-side differential sense pair for coulomb counting; accepts ±34.4 mV OCD threshold across 5–20 mΩ shunt |
| CHG / DSG | Outputs | Open-drain drivers for external high-side N-channel FETs; support voltage doubler for gate drive above VPWR |
| PACKP | Analog input | Pack-voltage measurement for protector logic; tolerates up to 28 V when 2-kΩ series resistor used |
| TS | Analog input | Thermistor interface (103AT-type); ADC gain –2 mV/°C enables precise battery temperature reporting |
| SDA / SCL | I²C interface | Open-drain data/clock lines; require 10-kΩ pullups to REG25; compliant with 400-kHz I²C timing |
| HDQ | IO | Single-wire bidirectional interface; supports 190–250 µs cycle time and 1.8–2.2 s reset pulse |
| REG25 | Power output | 2.5-V regulated supply output; must be decoupled with 1-µF ceramic capacitor to VSS |
| VPWR | Power input | Main supply (2.8–5 V); requires 0.1-µF ceramic decoupling to VSS; powers LDO and core logic |
| VSS | Ground | Primary device ground reference; common return for all analog and digital circuits |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Delivers <1% state-of-charge error across aging, temperature, and discharge rate variations via real-time battery model adaptation |
| Integrated Protection Logic | Hardware-based OVP/UVP/OCD/OCC/SCD with independent thresholds and programmable delays-no MCU intervention required |
| High-Side Coulomb Counting | 14–15-bit delta-sigma ADC with ±10 µV offset enables accurate charge/discharge tracking using low-value (5–20 mΩ) sense resistors |
| Dual Communication Interface | Simultaneous HDQ (single-wire) and I²C (two-wire) support simplifies integration into host systems with legacy or space-constrained designs |
| Temperature-Aware Gauging | Internal thermistor interface (TS) with –2 mV/°C gain and dedicated ADC enables dynamic compensation of self-discharge and impedance changes |
Applications
| Smartphones | Digital Cameras |
|---|---|
Use Scenario: Compact handheld device requiring precise runtime estimation and battery safety during fast charging and video recording. IC Role / Device Role / Timing Role: Primary fuel gauge and protector co-located with battery pack; provides real-time SOC, TTE, and hardware-level overcurrent cutoff. Use Value: Enables OEMs to eliminate external protection ICs and reduce BOM count while maintaining UL/IEC 62133 compliance through certified hardware safeguards. |
Use Scenario: High-current burst discharge during flash charging and continuous image capture, demanding accurate capacity tracking under thermal stress. IC Role / Device Role / Timing Role: Embedded pack-side fuel gauge with integrated temperature sensing and short-circuit protection (312.5 µs response). Use Value: Prevents thermal runaway during rapid discharge by detecting >74.6 mV SCD events and disabling DSG within microseconds-no firmware dependency. |
| Handheld Terminals | MP3/Multimedia Players |
Use Scenario: Rugged industrial terminal operating across –20°C to 60°C ambient, requiring reliable low-power runtime prediction during barcode scanning. IC Role / Device Role / Timing Role: Low-power fuel gauge in SLEEP+ mode (88 µA) with wake-on-current comparator; interfaces via I²C to application processor. Use Value: Extends battery life by 3× vs. active polling via wake-triggered measurements-reducing average current draw without sacrificing accuracy. |
Use Scenario: Consumer audio player with removable battery pack needing secure authentication and lifetime logging for warranty analytics. IC Role / Device Role / Timing Role: Pack-integrated gauge with SHA-1/HMAC authentication engine and 64-byte non-volatile scratch pad for usage history. Use Value: Supports anti-counterfeit verification and battery health diagnostics via encrypted data flash access-enabling service lifecycle management. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauge and protector applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27742YZFT-G1 | Firmware version 1.08; identical pinout and electrical specs; differs only in factory-programmed configuration data | No functional difference in protection thresholds, gauging accuracy, or interface behavior | Select when preconfigured calibration data matching specific cell chemistry is required |
| BQ27427YZFT | Lower-cost variant without integrated protection; lacks CHG/DSG drivers, OVP/UVP/OCD/SCD logic, and voltage doubler | Requires external protection IC and higher BOM cost; suitable only where safety certification is handled externally | Choose only if system already includes discrete protection and cost sensitivity outweighs integration benefit |
Compared with BQ27741YZFT-G1, the BQ27742YZFT-G1 offers identical hardware functionality but ships with different default firmware settings, whereas the BQ27427YZFT omits all protection circuitry-requiring additional components and layout area to achieve equivalent safety coverage.
Availability
BQ27741YZFT-G1 is available at Aetrix Electronics and suitable for smartphones, digital cameras, handheld terminals, and MP3 players requiring stable component supply, long-term lifecycle support, and certified battery safety compliance.
Supply support for BQ27741YZFT-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 delivering analog and embedded processing solutions, with deep expertise in power management, signal chain, and battery management systems.
The BQ27741YZFT-G1 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for space-constrained, safety-critical single-cell Li-ion applications where high-accuracy gauging and autonomous hardware protection are mandatory.
FAQ
What communication interfaces does the BQ27741YZFT-G1 support?
The BQ27741YZFT-G1 supports both I²C and HDQ serial interfaces. I²C uses open-drain SDA/SCL pins with 10-kΩ pullups to REG25 and operates up to 400 kHz. HDQ is a single-wire interface with 190–250 µs cycle time and 1.8–2.2 s reset pulse. Both interfaces allow full register and data flash access, and the device ships configured for I²C mode by default.
How does the BQ27741YZFT-G1 implement battery protection without external components?
The BQ27741YZFT-G1 integrates hardware-based protection logic for overvoltage (4.39 V), undervoltage (2.407 V), overcurrent in charge (20 mV), overcurrent in discharge (34.4 mV), and short-circuit (74.6 mV). It drives external high-side N-channel FETs via CHG and DSG pins, using an internal voltage doubler to ensure sufficient gate drive above VPWR-eliminating need for external charge pumps or protection controllers.
What is the role of the SRP and SRN pins on the BQ27741YZFT-G1?
The SRP and SRN pins form a differential input pair for the integrated 14–15-bit delta-sigma coulomb counter. They connect across a high-side sense resistor (5–20 mΩ) to measure battery current flow. SRP links near PACK+, SRN near CELL+, enabling bidirectional current detection: positive VSRP–VSRN indicates charge; negative indicates discharge. Input offset is ±10 µV, supporting sub-mA resolution.
Does the BQ27741YZFT-G1 support temperature compensation for fuel gauging?
Yes, the BQ27741YZFT-G1 supports full thermal compensation via its TS pin, which interfaces with a 103AT-type NTC thermistor. The internal ADC has a calibrated gain of –2 mV/°C, enabling precise temperature measurement. This data feeds the Impedance Track™ algorithm to dynamically adjust SOC, time-to-empty, and aging models-ensuring <1% error across –40°C to +85°C operating range.
What packaging and thermal characteristics apply to the BQ27741YZFT-G1?
The BQ27741YZFT-G1 uses a 15-ball NanoFree™ DSBGA (YZF) package measuring 2.78 mm × 1.96 mm. Its thermal metrics include RθJA = 70°C/W, RθJB = 20°C/W, and ψJB = 18°C/W. The device operates from –40°C to +85°C ambient, with functional temperature extended to +100°C. A 0.1-µF ceramic capacitor on VPWR and 1-µF on REG25 are mandatory for stable thermal performance.
BQ27741YZFT-G1 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 15-UFBGA, DSBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Multi-Function Controller
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- Over Current, Over Temperature, Over/Under Voltage, Short Circuit
- Interface:
- HDQ, I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 15-DSBGA
BQ27741YZFT-G1 FAQ
1.How can I place an order for BQ27741YZFT-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27741YZFT-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 BQ27741YZFT-G1 reliable?
The price and inventory of BQ27741YZFT-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27741YZFT-G1 is usually 5 days.
3.What payment methods are accepted for BQ27741YZFT-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27741YZFT-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27741YZFT-G1?
BQ27741YZFT-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27741YZFT-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 BQ27741YZFT-G1?
For technical support, including BQ27741YZFT-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27741YZFT-G1 requirements.
6.How does Aetrix verify that BQ27741YZFT-G1 is sourced from the original manufacturer or authorized distributors?
All BQ27741YZFT-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 BQ27741YZFT-G1 meets industry standards.
7.What is the process for return or replacement of BQ27741YZFT-G1?
All BQ27741YZFT-G1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27741YZFT-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 BQ27741YZFT-G1 part is unused and in its original packaging.
Return procedure for BQ27741YZFT-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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