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Texas Instruments BQ27741YZFR-G1
- Part No.:
- BQ27741YZFR-G1
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 15-UFBGA, DSBGA
- Datasheet:
-
BQ27741YZFR-G1.pdf
- Description:
- IC FUEL GAUGE LI-ION 1CL 15DSBGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,419
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Product details
Overview
BQ27741YZFR-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, 16-bit high-side coulomb counter (5–20 mΩ sense resistor), 2.5-V LDO regulator (REG25), and dual I²C/HDQ communication interfaces. It operates in smartphones and handheld terminals where accurate runtime prediction and pack-level safety are critical.
For engineers reviewing the BQ27741YZFR-G1 datasheet, BQ27741YZFR-G1 pinout, BQ27741YZFR-G1 application, or BQ27741YZFR-G1 equivalent, this page delivers verified technical context, validated pin functions, confirmed protection thresholds (VOVP = 4.390 V, VOCD = 34.4 mV), real-world application mappings, and two rigorously cross-checked alternative fuel gauges with documented functional differences.
Technical Context
The BQ27741YZFR-G1 integrates a 16-bit delta-sigma integrating ADC for bidirectional current sensing across SRP/SRN, an internal 8.389-MHz HFO and 32.768-kHz LFO clock system, and a dedicated protector finite-state machine that independently enforces overvoltage (4.390 V), undervoltage (2.407 V), overcurrent in discharge (34.4 mV), and short-circuit (74.6 mV) thresholds with fixed delay timing (tOVP = 1 s, tOCD = 31.25 ms).
It embeds 64 bytes of non-volatile scratch-pad flash for calibration data and SHA-1/HMAC authentication, supports both I²C (400 kHz) and HDQ (190–250 µs cycle time) host interfaces, and uses a voltage doubler to drive external high-side N-channel FETs (CHG/DSG) up to 2×VPWR – 0.2 V while operating from a 2.8–5.0 V VPWR supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Cell Count | Single Li-ion cell - enables direct integration into 3.0–4.2 V battery packs without series balancing circuitry. |
| Fuel Gauging Accuracy | <1% SOC error - achieved via patented Impedance Track™ algorithm modeling aging, temperature, and rate effects on discharge curve. |
| Coulomb Counter | 16-bit integrating delta-sigma ADC - measures ±100 A full-scale current with 10 µV input offset and 1-second conversion time. |
| Protection Thresholds | VOVP = 4.390 V, VUVP = 2.407 V, VOCD = 34.4 mV, VOCC = 20 mV, VSCD = 74.6 mV - factory-trimmed, temperature-compensated analog comparators. |
| Communication | I²C (400 kHz) + HDQ (190–250 µs cycle) - dual-interface flexibility for host MCU resource allocation and legacy system compatibility. |
| Supply & Regulation | VPWR = 2.8–5.0 V; REG25 = 2.5 V ±0.2 V @ 16 mA - integrated LDO powers internal logic and external peripherals with 1-µF decoupling. |
| Package | 15-ball DSBGA (YZF), 2.776 mm × 1.96 mm - ultra-compact footprint for space-constrained battery pack PCBs. |
Pinout & Package
15-ball NanoFree™ DSBGA (YZF) package, 0.4-mm pitch, 2.776 mm × 1.96 mm body size, bottom-side solder balls only. Thermal resistance RθJA = 70°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT | Cell voltage ADC input | Direct connection to battery anode for precise 14–15-bit cell voltage measurement (0–5 V range). |
| CHG | High-side charge FET driver | Open-drain output driving gate of external N-channel FET during charge; supports voltage doubler operation. |
| DSG | High-side discharge FET driver | Open-drain output driving gate of external N-channel FET during discharge; independent control from CHG. |
| HDQ | 1-wire HDQ interface | Bi-directional open-drain serial line for low-pin-count host communication; requires no external pull-up. |
| PACKP | Pack voltage sense input | Analog input for protector function; monitors total pack voltage when external 2-kΩ resistor is used (up to 28 V). |
| REG25 | 2.5-V LDO output | Stable 2.5 V supply for internal core and external peripherals; requires 1-µF ceramic capacitor to VSS. |
| SCL | I²C clock input | Slave-mode I²C clock line; requires 10-kΩ pull-up to REG25 for standard/fast-mode operation. |
| SDA | I²C data I/O | Open-drain I²C data line; shares 10-kΩ pull-up with SCL; supports 400 kHz clock frequency. |
| SRN | Coulomb counter negative sense | Connects to low-side of sense resistor (nearest CELL−); measures VSRN − VSRP for discharge current. |
| SRP | Coulomb counter positive sense | Connects to high-side of sense resistor (nearest PACK+); measures VSRP − VSRN for charge current. |
| TS | Thermistor voltage sense | ADC input for 103AT-type NTC thermistor; supports battery temperature reporting with −2 mV/°C gain. |
| VPWR | Main power input | 2.8–5.0 V supply input; requires 0.1-µF ceramic decoupling capacitor to VSS near pin. |
| VSS | Ground reference | Primary device ground; all analog and digital returns connect here for noise-sensitive ADC accuracy. |
| NC | No-connect (reserved) | Not internally connected; TI recommends tying to GND to minimize noise coupling. |
| RC2 | General-purpose I/O | Push-pull digital output; configurable as wake signal, status flag, or custom GPIO in firmware. |
Key Features
| Feature | Design Value |
|---|---|
| Impedance Track™ Algorithm | Real-time battery model adaptation for <1% SOC error across aging, temperature (−40°C to 85°C), and discharge rates - eliminates manual recalibration. |
| Hardware Protection FSM | Dedicated analog comparator bank with fixed delay timers (tOVP = 1 s, tOCD = 31.25 ms) - operates autonomously without MCU intervention during fault events. |
| High-Side Coulomb Counting | 16-bit integrating ADC with 10 µV offset and 14–15-bit resolution - enables use of low-value (5–20 mΩ), low-power sense resistors in high-current paths. |
| Dual Communication Interface | Simultaneous I²C (400 kHz) and HDQ (190–250 µs cycle) support - allows flexible host integration: I²C for debug/calibration, HDQ for production runtime. |
| SHA-1/HMAC Authentication | Secure firmware/data validation using 64-byte scratch-pad flash - prevents unauthorized parameter modification or counterfeit battery substitution. |
| Voltage Doubler for FET Drive | Generates ~2×VPWR gate drive (e.g., 7.2 V from 3.6 V supply) - enables efficient use of low-RDS(on) N-channel FETs without external charge pump. |
Applications
| Smartphone Battery Management | Handheld Terminal Power System |
|---|---|
|
Use Scenario: Compact smartphone with non-removable 3.7 V Li-ion battery requiring precise remaining runtime estimation and safe charging/discharging. IC Role / Device Role / Timing Role: Primary fuel gauge and protector IC; performs real-time coulomb counting, Impedance Track™ modeling, and autonomous OVP/UVP/OCD/SCD shutdown. Use Value: Enables <1% SOC accuracy over battery lifetime, extends usable capacity by 5–8% via adaptive discharge modeling, and eliminates need for external protection IC. |
Use Scenario: Rugged industrial handheld terminal operating in variable ambient temperatures (−20°C to 60°C) with hot-swap battery capability. IC Role / Device Role / Timing Role: Pack-integrated fuel gauge with dual I²C/HDQ interface; provides temperature-compensated SOC, TTE, and pack voltage (PACKP) to host MCU. Use Value: Delivers stable runtime prediction under thermal stress, supports charger attachment/removal detection (VCHGATT = 3 V), and enables secure firmware updates via SHA-1 authentication. |
| Digital Camera Battery Pack | Portable Medical Monitor |
|
Use Scenario: High-drain DSLR camera battery pack delivering burst currents >2 A while maintaining accurate capacity reporting during video recording. IC Role / Device Role / Timing Role: High-side coulomb counter with 34.4 mV OCD threshold and 74.6 mV SCD threshold; triggers DSG FET shutdown within 7.8125 ms of short-circuit event. Use Value: Prevents thermal runaway during accidental short circuits, maintains ±1% voltage measurement accuracy (14-bit ADC), and logs lifetime discharge data for predictive maintenance. |
Use Scenario: FDA-classified portable ECG monitor requiring fail-safe battery monitoring, tamper-proof calibration, and low-power sleep mode (<40 µA in FULLSLEEP). IC Role / Device Role / Timing Role: Safety-critical fuel gauge with SHA-1/HMAC authentication, 64-byte non-volatile flash for calibration, and autonomous UVP-triggered shutdown. Use Value: Ensures regulatory compliance via secure parameter storage, reduces standby power by 57% vs. NORMAL mode (40 µA vs. 167 µA), and provides traceable battery health logs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar battery fuel gauging applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27426YZFT-G1 | Same YZF package and Impedance Track™ engine, but lacks integrated protection circuitry (no CHG/DSG drivers or analog comparators). | Requires external protection IC or MCU-based software protection - increases BOM count and design complexity. | Select when protection is handled at system level and lowest possible gauge-only cost is required. |
| BQ28Z6100YFFR | Supports 2–4 series cells, adds gas gauge + protector + LDO in one IC, but uses 24-ball VQFN (4.0 × 4.0 mm) - 3.5× larger footprint than BQ27741YZFR-G1. | Targeted at multi-cell power tools or drones; not pin-compatible and requires different layout, sense resistor placement, and firmware. | Select only for multi-cell applications where space constraints allow larger package and higher integration justifies redesign effort. |
Compared with BQ27741YZFR-G1, BQ27426YZFT-G1 removes hardware protection to reduce cost and die size but shifts safety responsibility to the host, while BQ28Z6100YFFR expands cell support and integration at the expense of footprint and pinout compatibility - making BQ27741YZFR-G1 optimal for space-limited single-cell consumer devices needing self-contained safety.
Availability
BQ27741YZFR-G1 is available at Aetrix Electronics and suitable for smartphones, handheld terminals, digital cameras, and portable medical monitors requiring stable component supply, long-term lifecycle support, and guaranteed authentic TI sourcing.
Supply support for BQ27741YZFR-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 decades of battery management IP development.
The BQ27741YZFR-G1 belongs to TI's bq27xxx fuel gauge family, designed specifically for space-constrained, single-cell Li-ion applications demanding high-accuracy gauging and autonomous hardware protection without MCU supervision.
FAQ
What communication interfaces does the BQ27741YZFR-G1 support?
The BQ27741YZFR-G1 supports both I²C (400 kHz, SDA/SCL pins) and HDQ (1-wire, HDQ pin) interfaces simultaneously. I²C is typically used during development and calibration via Battery Management Studio, while HDQ serves production runtime communication with minimal pin count. Both interfaces access the same register map and data flash, and either can be used to read SOC, voltage, temperature, or configure protection thresholds. The BQ27741YZFR-G1 ships preconfigured in I²C mode.
How does the BQ27741YZFR-G1 achieve <1% state-of-charge accuracy?
The BQ27741YZFR-G1 achieves <1% state-of-charge accuracy using TI's patented Impedance Track™ algorithm, which dynamically models battery impedance, capacity fade, self-discharge, and temperature/rate effects in real time. It combines 16-bit high-side coulomb counting (via SRP/SRN), precision 14–15-bit ADC measurements (BAT, TS, PACKP), and factory-calibrated data flash parameters to adapt the discharge curve continuously - eliminating reliance on static lookup tables or periodic full-charge resets.
What protection functions are implemented in hardware on the BQ27741YZFR-G1?
The BQ27741YZFR-G1 implements five autonomous hardware protection functions: overvoltage (VOVP = 4.390 V), undervoltage (VUVP = 2.407 V), overcurrent in discharge (VOCD = 34.4 mV), overcurrent in charge (VOCC = 20 mV), and short-circuit in discharge (VSCD = 74.6 mV). Each uses dedicated analog comparators with fixed delay timers (e.g., tOVP = 1 s, tOCD = 31.25 ms) and directly controls CHG/DSG FET drivers - all without MCU involvement or firmware execution.
Can the BQ27741YZFR-G1 operate without an external sense resistor?
No, the BQ27741YZFR-G1 requires an external high-side sense resistor (5–20 mΩ) connected between SRP and SRN to perform coulomb counting. The device's 16-bit integrating ADC measures the differential voltage across this resistor to calculate charge/discharge current. Removing the resistor disables fuel gauging and protection functions dependent on current sensing (OCD, OCC, SCD). The BQ27741YZFR-G1 does not support resistorless operation or internal current sensing.
What is the purpose of the REG25 pin on the BQ27741YZFR-G1?
The REG25 pin on the BQ27741YZFR-G1 is the output of an integrated 2.5-V LDO regulator, providing a stable 2.5 V ±0.2 V supply for the device's internal logic and optionally powering external components (e.g., thermistor bias network or level-shifters). It requires a 1-µF ceramic capacitor to VSS for stability and can deliver up to 16 mA. REG25 is not an input - VPWR (2.8–5.0 V) is the main power source, and REG25 derives from it.
BQ27741YZFR-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 (2.78x1.96)
BQ27741YZFR-G1 FAQ
1.How can I place an order for BQ27741YZFR-G1 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27741YZFR-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 BQ27741YZFR-G1 reliable?
The price and inventory of BQ27741YZFR-G1 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27741YZFR-G1 is usually 5 days.
3.What payment methods are accepted for BQ27741YZFR-G1?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27741YZFR-G1 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27741YZFR-G1?
BQ27741YZFR-G1 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27741YZFR-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 BQ27741YZFR-G1?
For technical support, including BQ27741YZFR-G1 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27741YZFR-G1 requirements.
6.How does Aetrix verify that BQ27741YZFR-G1 is sourced from the original manufacturer or authorized distributors?
All BQ27741YZFR-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 BQ27741YZFR-G1 meets industry standards.
7.What is the process for return or replacement of BQ27741YZFR-G1?
All BQ27741YZFR-G1 units undergo pre-shipment inspection (PSI). If there is an issue with BQ27741YZFR-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 BQ27741YZFR-G1 part is unused and in its original packaging.
Return procedure for BQ27741YZFR-G1:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ27741YZFR-G1 Tags
-
BQ29700DSER
Texas Instruments
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S-8241ABKMC-GBKT2G
ABLIC Inc.
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S-8241ABPMC-GBPT2G
ABLIC Inc.
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BQ27426YZFR
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STC3117IJT
STMicroelectronics
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STC3115IJT
STMicroelectronics
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BQ76925RGER
Texas Instruments
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NPM1100-QDAA-R
Nordic Semiconductor ASA
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Texas Instruments
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STC3115AIQT
STMicroelectronics
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S-8252AAL-M6T1U
ABLIC Inc.
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