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Texas Instruments BQ27441DRZT-G1B
- Part No.:
- BQ27441DRZT-G1B
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 12-VFDFN Exposed Pad
- Datasheet:
-
BQ27441DRZT-G1B.pdf
- Description:
- IC FUEL GAUGE LI-ION 1CELL 12SON
- Quantity:
- Payment:
- Shipping:
Inventory:2,246
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Product details
Overview
BQ27441DRZT-G1 from Texas Instruments is a system-side single-cell Li-ion battery fuel gauge IC using Impedance Track™ algorithm to report remaining capacity (mAh), state-of-charge (%), voltage (mV), and state-of-health. It integrates a 1.8-V LDO, 16-bit coulomb counter ADC, and internal temperature sensor, operating directly from the battery pack in smartphones and portable electronics.
For engineers reviewing the BQ27441DRZT-G1 datasheet, BQ27441DRZT-G1 pinout, BQ27441DRZT-G1 application, or BQ27441DRZT-G1 equivalent, key selection criteria include its pre-calibrated 10-mΩ sense resistor support, I²C interface timing compliance (400 kHz Fast Mode), shutdown current of 0.6 µA, and firmware version G1B (CHEM_ID 0x0312 for 4.3–4.35 V LiCoO₂ chemistry).
Technical Context
The BQ27441DRZT-G1 implements Texas Instruments' patented Impedance Track™ algorithm to model battery impedance across temperature, aging, and load conditions-enabling accurate SoC estimation without host calibration. Its coulomb counter uses a 16-bit integrating ADC with ±25 mV differential input range on SRP/SRN pins, supporting Kelvin-sense connection to a 10-mΩ external shunt.
It operates in four power modes-NORMAL (93 µA), SLEEP (21 µA), HIBERNATE (9 µA), and SHUTDOWN (0.6 µA)-with automatic transitions triggered by activity or host command. Wake-up from SHUTDOWN is initiated via rising edge on GPOUT (1.2 V threshold), and the integrated 1.8-V LDO powers internal circuitry from BAT (2.45–4.5 V input range).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Fuel Gauge Algorithm | Impedance Track™ - enables dynamic SoC estimation across aging, temperature, and rate without host recalibration |
| Chemistry Support | LiCoO₂ with CHEM_ID 0x0312 - optimized for 4.3–4.35 V max charge voltage profiles |
| Coulomb Counter | 16-bit integrating ADC - supports ±25 mV differential input on SRP/SRN for high-resolution current integration |
| I²C Interface | 400 kHz Fast Mode - compatible with standard microcontroller I²C peripherals; requires external 10-kΩ pullups on SDA/SCL |
| Power Modes | NORMAL (93 µA), SLEEP (21 µA), HIBERNATE (9 µA), SHUTDOWN (0.6 µA) - enables ultra-low-power battery monitoring during idle |
| LDO Output | 1.8 V regulated output - powers internal logic; requires 0.47 µF ceramic decoupling capacitor between VDD and VSS |
| Temperature Sensing | Integrated analog temperature sensor - provides internal die temperature measurement; host may override with external value |
Pinout & Package
VSON-12 package (2.50 mm × 4.00 mm), thermally enhanced, no-lead surface-mount format with exposed thermal pad (pin 13 not electrically connected). Designed for space-constrained portable applications requiring minimal board area and low profile.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| BAT (6) | LDO input & battery voltage monitor | Kelvin-sense connection point to PACK+; supplies LDO and enables cell voltage measurement (2.45–4.5 V range); requires 1 µF capacitor to VSS |
| SRP (8) / SRN (7) | Coulomb counter differential inputs | Accepts ±25 mV differential signal across 10-mΩ sense resistor in high-side current path; no calibration required |
| SDA (1) / SCL (2) | I²C bidirectional data/clock | Open-drain interface; requires external 10-kΩ pullup resistors to VPU (1.62–3.6 V); supports 400 kHz Fast Mode |
| GPOUT (12) | Configurable open-drain output | Default: SOC interrupt pulse; configurable as BAT_LOW warning; also serves as wake-up input (rising edge >1.2 V exits SHUTDOWN) |
| BIN (10) | Battery insertion detection input | Digital input with internal pullup control; detects removable battery presence via pulldown resistor on pack; supports embedded battery with 10-kΩ VSS tie |
| VDD (5) | 1.8-V regulated output | Internal LDO output; powers gauge core; not intended to supply external circuitry; requires 0.47 µF decoupling to VSS |
| VSS (3) | Ground reference | Primary analog/digital ground return; must be low-impedance connection shared with sense resistor and decoupling capacitors |
Key Features
| Feature | Design Value |
|---|---|
| Pre-calibrated coulomb counting | Factory-trimmed for 10-mΩ, 1% external sense resistor - eliminates system-level calibration effort and firmware overhead |
| Impedance Track™ modeling | Real-time compensation for battery aging, self-discharge, temperature drift, and load-rate effects - maintains <±5% SoC accuracy over life |
| Ultra-low-power shutdown | 0.6 µA quiescent current in SHUTDOWN mode - extends shelf-life and preserves battery charge during long-term storage |
| Integrated LDO regulator | 1.8-V output powered directly from battery (2.45–4.5 V input) - removes need for external bias rail and simplifies power architecture |
| Flexible battery detection | Configurable BIN pin with programmable pullup enable - supports both embedded and hot-swappable battery configurations |
| Host-override temperature input | Accepts external temperature via I²C - enables use of high-accuracy NTC or digital sensors instead of internal die sensor when needed |
Applications
| Smartphones | Tablets |
|---|---|
Use Scenario: Real-time battery level reporting and low-battery warning during active UI usage and background app operation. IC Role / Device Role / Timing Role: System-side fuel gauge providing smoothed SoC % and remaining mAh via I²C; triggers GPOUT interrupt on threshold crossing. Use Value: Enables accurate "X hours remaining" estimates and prevents unexpected shutdown by detecting voltage sag under load and aging-induced capacity loss. |
Use Scenario: Multi-tasking with display, Wi-Fi, and GPS active; battery monitoring during charging and discharging cycles. IC Role / Device Role / Timing Role: Primary coulomb counter and impedance modeler; reports FullChargeCapacity and StateOfHealth to OS power manager. Use Value: Delivers consistent runtime prediction across charge cycles and compensates for capacity fade due to calendar aging and cycle wear. |
| Digital Cameras | Handheld Terminals |
Use Scenario: Burst-mode video recording and flash usage causing high-current transients and rapid voltage drop. IC Role / Device Role / Timing Role: High-speed coulomb integration (1 s conversion time) and real-time OCV-based correction during idle periods. Use Value: Maintains SoC accuracy despite large current spikes and intermittent loads, avoiding premature "battery empty" alerts. |
Use Scenario: Rugged field device with removable battery packs used in logistics scanning and inventory management. IC Role / Device Role / Timing Role: Battery insertion detection (BIN pin), secure fuel gauging, and low-power sleep mode during scan standby. Use Value: Enables hot-swap battery replacement with instant SoC resumption and <9 µA HIBERNATE current for multi-shift operation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ27441DRZR-G1B | Same die, VSON-12 package but with different tape-and-reel orientation (reel vs. tray); identical electrical specs and firmware (G1B, CHEM_ID 0x0312) | No functional difference; selected based on assembly line feed requirements (reel-fed SMT vs. manual/tray placement) | Choose DRZR-G1B for automated pick-and-place systems requiring 3,000-unit reels; DRZT-G1B is supplied in 250-unit trays. |
| BQ27510-G3 | Higher-precision 18-bit coulomb counter, extended temperature range (–40°C to 105°C), and additional safety features (cell overvoltage/undervoltage flags) | Targeted at industrial and automotive-qualified designs requiring extended reliability and diagnostic coverage beyond consumer-grade BQ27441DRZT-G1 | Select BQ27510-G3 only if design mandates AEC-Q200 qualification, wider temp range, or enhanced fault reporting - not a drop-in replacement. |
Compared with BQ27441DRZT-G1, the DRZR-G1B variant offers identical performance in a reel-packaged form factor for high-volume SMT lines, while the BQ27510-G3 adds industrial-grade diagnostics and precision at higher cost and complexity - making BQ27441DRZT-G1 optimal for cost-sensitive, space-constrained consumer portable devices.
Availability
BQ27441DRZT-G1 is available at Aetrix Electronics and suitable for smartphones, tablets, and handheld terminals requiring stable component supply, long-lifecycle support, and guaranteed traceable sourcing for production ramp and sustained manufacturing.
Supply support for BQ27441DRZT-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 leadership in battery management ICs and precision analog signal chains.
The BQ27441DRZT-G1 belongs to TI's Impedance Track™ fuel gauge product line, designed specifically for system-side, single-cell Li-ion battery monitoring in space- and power-constrained portable electronics where accuracy, low quiescent current, and minimal host firmware overhead are critical.
FAQ
What battery chemistries does the BQ27441DRZT-G1 support?
The BQ27441DRZT-G1 supports LiCoO₂ chemistry with CHEM_ID 0x0312, optimized for 4.3–4.35 V maximum charge voltage. It is factory-configured for this profile and does not support LiFePO₄, NMC, or other chemistries without firmware reprogramming - which is not supported for the G1B variant. Always verify CHEM_ID via the Control() subcommand FW_VERSION and CHEM_ID before deployment.
How does the BQ27441DRZT-G1 achieve accurate state-of-charge estimation?
The BQ27441DRZT-G1 achieves accurate SoC estimation using Texas Instruments' Impedance Track™ algorithm, which continuously models battery impedance based on real-time voltage, current, temperature, and load history. It combines 16-bit coulomb counting with OCV-based correction and aging compensation - delivering <±5% SoC error across temperature, aging, and discharge rates without host calibration.
Can the BQ27441DRZT-G1 operate without an external sense resistor?
No. The BQ27441DRZT-G1 requires an external 10-mΩ, 1% precision sense resistor connected between PACK+ and VSYS for coulomb counting. Its SRP and SRN pins are differential analog inputs designed exclusively for Kelvin sensing across that resistor. Operation without the resistor disables current measurement and invalidates all capacity and SoC calculations - the device will not function as a fuel gauge.
What is the purpose of the BIN pin on the BQ27441DRZT-G1?
The BIN pin on the BQ27441DRZT-G1 provides battery insertion detection. When OpConfig [BI_PU_EN] = 1 (default), it senses a logic low as battery present - implemented via a 10-kΩ pulldown on the pack and 1.8-MΩ pullup on the system board. For embedded batteries, a fixed 10-kΩ pulldown to VSS is recommended. Leaving BIN unconnected or shorted risks incorrect battery detection and firmware misbehavior.
Does the BQ27441DRZT-G1 require calibration during system integration?
No. The BQ27441DRZT-G1 is factory-calibrated for a standard 10-mΩ, 1% external sense resistor and requires zero system-level calibration. Its Impedance Track™ algorithm auto-compensates for aging, temperature, and rate effects using built-in models. Host firmware only needs to issue standard I²C commands (e.g., StateOfCharge(), RemainingCapacity()) - no characterization or learning cycles are needed.
BQ27441DRZT-G1B Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- Impedance Track™
- Package/Case:
- 12-VFDFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion
- Number of Cells:
- 1
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-SON (2.5x4)
BQ27441DRZT-G1B FAQ
1.How can I place an order for BQ27441DRZT-G1B through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ27441DRZT-G1B 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 BQ27441DRZT-G1B reliable?
The price and inventory of BQ27441DRZT-G1B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ27441DRZT-G1B is usually 5 days.
3.What payment methods are accepted for BQ27441DRZT-G1B?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ27441DRZT-G1B transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ27441DRZT-G1B?
BQ27441DRZT-G1B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ27441DRZT-G1B 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 BQ27441DRZT-G1B?
For technical support, including BQ27441DRZT-G1B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ27441DRZT-G1B requirements.
6.How does Aetrix verify that BQ27441DRZT-G1B is sourced from the original manufacturer or authorized distributors?
All BQ27441DRZT-G1B 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 BQ27441DRZT-G1B meets industry standards.
7.What is the process for return or replacement of BQ27441DRZT-G1B?
All BQ27441DRZT-G1B units undergo pre-shipment inspection (PSI). If there is an issue with BQ27441DRZT-G1B, 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 BQ27441DRZT-G1B part is unused and in its original packaging.
Return procedure for BQ27441DRZT-G1B:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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