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Texas Instruments BQ2084DBTR-V150G4
- Part No.:
- BQ2084DBTR-V150G4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBTR-V150G4.pdf
- Description:
- IC GAS GAUGE LI-ION 2-4C 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,703
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Product details
Overview
BQ2084DBTR-V150G4 from Texas Instruments is a Smart Battery Specification (SBS) v1.1-compliant gas gauge IC designed for Li-ion and Li-polymer battery packs. It delivers accurate remaining capacity measurement (<1% error), integrates a 16-bit delta-sigma ADC for voltage/temperature sensing, and uses a self-calibrating 16-bit integrating converter for current measurement with better than 0.65-nVh resolution and <1-µV offset error. It operates in 7.2-V to 14.4-V multi-cell systems and drives 3–5 segment LED displays for real-time fuel gauge indication.
For engineers reviewing the BQ2084DBTR-V150G4 datasheet, BQ2084DBTR-V150G4 pinout, BQ2084DBTR-V150G4 application, or BQ2084DBTR-V150G4 equivalent, this page provides verified technical context, SMBus 2-wire interface timing, coulomb-counting accuracy specs, LED driver capability, and integration requirements with the bq29312A AFE - all critical for smart battery pack design validation and SBS compliance verification.
Technical Context
The BQ2084DBTR-V150G4 implements dual sigma-delta ADC architecture: one dedicated to high-precision bipolar current sensing (–0.25 V to +0.25 V range) via SR1/SR2, and another for simultaneous pack voltage, individual cell voltage (via bq29312A interface), and temperature measurement. It performs continuous coulomb counting with auto-offset calibration and supports programmable cell modeling for state-of-charge compensation across temperature, rate, and aging.
It operates as a slave device on the SMBus 2-wire interface (10–100 kHz), communicates SBS v1.1 data (RemainingCapacity, FullChargeCapacity, Temperature, Voltage, Current, TimeToEmpty), and interfaces directly with the bq29312A AFE for protection, cell balancing, and power mode control. Its internal 1-kB flash stores configuration parameters including nominal capacity, self-discharge rate, and EDV thresholds, enabling adaptive learning of true full-charge capacity during qualified discharge cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - powers analog/digital sections separately (VDDA/VDDD); enables stable operation across Li-ion pack voltage ranges when paired with bq29312A. |
| Current Measurement Resolution | Better than 0.65 nVh - enables sub-mAh charge/discharge accumulation accuracy over extended runtime, critical for precise fuel gauging in portable instrumentation. |
| Offset Error (SR1–SR2) | <1 µV (typical) - achieved via auto-calibration; eliminates baseline drift in sense-resistor measurements without external trimming. |
| SMBus Frequency Range | 10–100 kHz - supports robust host communication in noisy embedded environments; includes timeout detection (25–35 ms) for bus fault recovery. |
| Operating Temperature | –20°C to +85°C - validated for industrial and medical portable equipment where thermal stability impacts capacity prediction fidelity. |
| LED Drive Capability | 5-channel open-drain outputs (LED1–LED5) - directly drives 3-, 4-, or 5-segment displays at 10 mA per segment for visual SOC indication without external drivers. |
| Data Flash Endurance | 20,000 write cycles / 10-year retention - stores learned FCC, EDV thresholds, and compensation factors persistently across battery lifecycle. |
Pinout & Package
Package: 38-pin TSSOP (DBT), 0.65-mm pitch, RoHS-compliant surface-mount package optimized for compact battery pack PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Cell voltage input | Accepts scaled pack/cell voltage from bq29312A CELL pin; enables individual cell monitoring and voltage-based RM correction. |
| SR1 / SR2 | Current sense differential inputs | Interface to 5–30 mΩ sense resistor; measures bidirectional current flow with ±0.25 V range and auto-zeroed offset for coulomb counting. |
| TS | Temperature sensor input | Supports NTC thermistor (e.g., Semitec 103AT) or internal die sensor; feeds temperature-compensated self-discharge and EDV algorithms. |
| SMBD / SMBC | SMBus data/clock | Open-drain bidirectional interface compliant with SBS v1.1; transmits RemainingCapacity(), Voltage(), Temperature(), and other SMBus commands. |
| LED1–LED5 | LED segment drivers | Open-drain outputs with 10 mA sink capability; enable direct connection to discrete LEDs for 20%/25%/33% SOC step indication. |
| RBI | Register backup supply | Accepts storage capacitor or auxiliary battery; maintains register state and flash integrity during main power loss or deep sleep. |
| PRES | Pack insertion sense | Active-low input detects battery insertion into host system; triggers normal operation and FET enable within 250 ms. |
| SAFE | Safety protection output | Active-low signal for secondary fuse blow or hardware-level shutdown; provides fail-safe layer beyond bq29312A protection. |
Key Features
| Feature | Design Value |
|---|---|
| SBS v1.1 Compliance | Fully implements Smart Battery Data (SBData) commands and charge-control functions required for interoperability with SBS-compliant hosts. |
| Integrated Flash Memory | 1-kB on-chip data flash stores user-configurable parameters (nominal capacity, EDV thresholds, rate/temp compensation) - eliminates external EEPROM and reduces BOM count. |
| Self-Calibrating Integrating ADC | Performs automatic SR1/SR2 offset cancellation (<1 µV) during SMBus idle periods - ensures long-term coulomb-counting accuracy without manual calibration. |
| Programmable Cell Modeling | Adjusts remaining capacity estimation based on real-time temperature, discharge rate, and aging - improves SOC accuracy to <1% across use conditions. |
| LED Display Control | Drives 3–5 discrete LED segments with configurable step sizes (20%, 25%, 33%) - provides intuitive, low-cost fuel gauge feedback without MCU intervention. |
Applications
| Notebook PCs | Medical Portable Devices |
|---|---|
Use Scenario: Integrated smart battery pack in ultraportable laptops requiring precise runtime prediction and SBS-compliant host communication. IC Role / Device Role / Timing Role: Primary gas gauge IC performing real-time coulomb counting, voltage/temperature monitoring, and SMBus reporting to EC/BIOS. Use Value: Enables accurate "Time to Empty" estimation and adaptive charging profiles, extending usable runtime by up to 8% versus fixed-model gauges. |
Use Scenario: Rechargeable battery module in handheld diagnostic instruments operating in variable ambient temperatures. IC Role / Device Role / Timing Role: Fuel gauge and safety coordinator interfacing with bq29312A for cell balancing and overvoltage/overcurrent protection. Use Value: Maintains <1% SOC accuracy across –10°C to +50°C, ensuring reliable low-battery warnings and preventing unexpected shutdown during critical procedures. |
| Test & Measurement Equipment | Industrial Portable Analyzers |
Use Scenario: Field-deployable multimeter or oscilloscope with hot-swappable Li-ion battery packs. IC Role / Device Role / Timing Role: SBS-compliant gas gauge managing remaining capacity, self-discharge compensation, and LED-based SOC display. Use Value: Supports firmware-updatable EDV thresholds and learned FCC, enabling consistent runtime accuracy across 500+ charge cycles without recalibration. |
Use Scenario: Ruggedized gas analyzer used in remote locations with infrequent charging opportunities. IC Role / Device Role / Timing Role: Core fuel management unit performing qualified discharge learning, temperature-compensated self-discharge modeling, and safe FET control. Use Value: Extends usable battery life by 12% through adaptive capacity learning and minimizes false low-battery alerts in wide-temperature deployments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBTR-V140 | Same DBT package and core architecture but configured for SBS v1.0; lacks v1.1-specific command set and enhanced EDV compensation logic. | Compatible only with legacy SBS v1.0 hosts; does not support newer TimeToFull() or CycleCount() registers defined in v1.1. | Select only if host system firmware does not require SBS v1.1 compliance or advanced learning features. |
| BQ20Z75-V150 | Successor device with integrated 32.768-kHz oscillator, higher-resolution ADC (18-bit), and expanded flash (2 kB); supports SBS v1.1 + manufacturer extensions. | Enables more granular temperature/rate modeling and longer data retention; requires updated firmware for new register map and extended commands. | Preferred for new designs requiring improved accuracy, longer flash endurance, or reduced external component count (no crystal/resistor needed). |
Compared with BQ2084DBTR-V150G4, the BQ2084DBTR-V140 offers backward compatibility at the cost of SBS v1.1 functionality, while the BQ20Z75-V150 delivers measurable improvements in resolution, integration, and learning fidelity - making it suitable for next-generation portable devices demanding higher fuel gauge precision and firmware extensibility.
Availability
BQ2084DBTR-V150G4 is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable devices, test equipment, and industrial analyzers requiring stable component supply, long-lifecycle support, and SBS v1.1 certification readiness.
Supply support for BQ2084DBTR-V150G4 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 experience in battery management solutions.
The BQ2084DBTR-V150G4 belongs to TI's Smart Battery Gas Gauge product line, engineered specifically for high-accuracy Li-ion/Li-polymer fuel gauging in portable systems requiring SBS v1.1 compliance, minimal external components, and adaptive learning of battery capacity under real-world usage conditions.
FAQ
What is the primary function of the BQ2084DBTR-V150G4 in a smart battery system?
The BQ2084DBTR-V150G4 serves as the core SBS v1.1-compliant gas gauge IC, performing real-time coulomb counting, voltage/temperature monitoring, and SMBus-based reporting of RemainingCapacity(), FullChargeCapacity(), and TimeToEmpty(). It works in tandem with the bq29312A AFE to deliver <1% fuel gauge accuracy while enabling LED-based SOC indication and adaptive capacity learning through qualified discharge cycles - all essential for reliable runtime prediction in portable electronics.
Does the BQ2084DBTR-V150G4 require an external crystal oscillator?
No - the BQ2084DBTR-V150G4 supports both internal and external clock sources. It can operate using either a 100-kΩ resistor on ROSC (pin 33) for internal oscillator mode or a 32.768-kHz crystal between XCK1/XCK2 (pins 34/33). The device automatically selects the active source at power-up; only one configuration should be implemented - never both simultaneously - to ensure stable timing for coulomb counting and SMBus communication.
How does the BQ2084DBTR-V150G4 achieve <1% state-of-charge accuracy?
The BQ2084DBTR-V150G4 achieves <1% SOC accuracy through three synergistic mechanisms: (1) a self-calibrating 16-bit integrating ADC with <1-µV offset error for precise coulomb counting, (2) dual-point voltage-based corrections (EDV1/EDV2) applied to the RemainingCapacity() register during discharge, and (3) programmable cell modeling that dynamically adjusts capacity estimation based on real-time temperature, discharge rate, and aging effects - all stored and executed from its 1-kB internal flash memory.
Can the BQ2084DBTR-V150G4 operate independently without the bq29312A AFE?
No - the BQ2084DBTR-V150G4 is designed explicitly for co-operation with the bq29312A analog front-end IC. It relies on the bq29312A for cell voltage multiplexing (feeding VIN), FET drive control (PCH/PDIS), overcurrent/overvoltage protection, and thermistor biasing. While the BQ2084DBTR-V150G4 handles computation and communication, the bq29312A provides the physical layer safety and sensing infrastructure; neither device is functionally complete without the other in production smart battery implementations.
What is the role of the RBI pin on the BQ2084DBTR-V150G4?
The RBI (Register Backup Input) pin on the BQ2084DBTR-V150G4 accepts a backup voltage source (≥1.3 V) from a storage capacitor or auxiliary battery to maintain register contents and flash integrity during main power loss or deep sleep. This ensures that critical parameters - including learned FullChargeCapacity(), EDV thresholds, and coulomb counter state - survive brownout events and enable seamless resume of fuel gauge operation upon power restoration, preserving accuracy across power cycles.
BQ2084DBTR-V150G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- Function:
- Battery Monitor
- Battery Chemistry:
- Lithium Ion/Polymer
- Number of Cells:
- 2 ~ 4
- Fault Protection:
- -
- Interface:
- SMBus
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP
BQ2084DBTR-V150G4 FAQ
1.How can I place an order for BQ2084DBTR-V150G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBTR-V150G4 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 BQ2084DBTR-V150G4 reliable?
The price and inventory of BQ2084DBTR-V150G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBTR-V150G4 is usually 5 days.
3.What payment methods are accepted for BQ2084DBTR-V150G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBTR-V150G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBTR-V150G4?
BQ2084DBTR-V150G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBTR-V150G4 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 BQ2084DBTR-V150G4?
For technical support, including BQ2084DBTR-V150G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBTR-V150G4 requirements.
6.How does Aetrix verify that BQ2084DBTR-V150G4 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBTR-V150G4 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 BQ2084DBTR-V150G4 meets industry standards.
7.What is the process for return or replacement of BQ2084DBTR-V150G4?
All BQ2084DBTR-V150G4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBTR-V150G4, 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 BQ2084DBTR-V150G4 part is unused and in its original packaging.
Return procedure for BQ2084DBTR-V150G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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