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Texas Instruments BQ2084DBT-V143G4
- Part No.:
- BQ2084DBT-V143G4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBT-V143G4.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,845
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Product details
Overview
BQ2084DBT-V143 from Texas Instruments is an SBS v1.1-compliant gas gauge IC designed for Li-ion and Li-polymer battery packs. It performs coulomb counting with better than 0.65-nVh resolution, integrates a 16-bit delta-sigma ADC for voltage/temperature measurement, supports SMBus 2-wire interface, and operates in a 38-pin TSSOP (DBT) package for 7.2-V to 14.4-V systems.
For engineers reviewing the BQ2084DBT-V143 datasheet, BQ2084DBT-V143 pinout, BQ2084DBT-V143 application, or BQ2084DBT-V143 equivalent, key selection considerations include its self-calibrating integrating converter offset error (<1 µV), integrated flash memory for programmable cell modeling, LED driver support for 3–5-segment displays, and co-design with bq29312 AFE for complete smart battery electronics.
Technical Context
The BQ2084DBT-V143 implements a low-power RISC CPU core with dedicated peripherals for battery fuel gauging. Its integrating ADC continuously samples SR1/SR2 differential voltage (–0.25 V to +0.25 V) to compute charge/discharge flow, while a separate 16-bit delta-sigma ADC digitizes VIN, TS, and internal temperature sensor outputs every second.
It communicates via SMBus slave mode (10–100 kHz), interfaces directly with bq29312 AFE through SDATA/SCLK/CLKOUT/SAFE signals, and uses RBI input for register backup during low-voltage conditions. The device supports automatic offset calibration, EDV-based RM correction at three voltage thresholds, and FCC learning during qualified discharge cycles.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - powers analog (VDDA/VSSA) and digital (VDDD/VSSD) domains independently |
| Coulomb Counting Resolution | Better than 0.65 nVh - enables sub-mAh accuracy in portable Li-ion applications over full temperature range |
| ADC Type & Bits | 16-bit delta-sigma - provides high-precision voltage, temperature, and current measurement with <1% error |
| Offset Error (SR1/SR2) | <1 µV typical - ensures minimal zero-current drift in charge/discharge integration |
| SMBus Frequency Range | 10–100 kHz - compatible with standard system management bus timing without external clock stretching |
| Operating Temperature | –20°C to +85°C - validated for notebook PC and medical equipment ambient environments |
| Data Flash Capacity | 1 kByte - stores nominal capacity, self-discharge rate, cell-modeling coefficients, and learned FCC values |
Pinout & Package
Package: 38-pin TSSOP (DBT), 0.65 mm pitch, body size 9.7 mm × 4.4 mm, exposed thermal pad not present.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Differential current sense inputs | Accept ±0.25 V across external sense resistor; enable bidirectional coulomb counting with auto-offset calibration |
| VIN | Cell voltage input | Receives scaled individual cell voltage from bq29312 AFE; used for VCELL1–VCELL4 reporting |
| TS | Thermistor voltage input | Supports NTC (e.g., Semitec 103AT) or internal temperature sensor; enables temperature-compensated self-discharge estimation |
| SMBD / SMBC | SMBus data/clock | Open-drain bidirectional I/O; compliant with SMBus 2.0 electrical specs up to 100 kHz |
| LED1–LED5 | LED segment drivers | Push-pull outputs capable of 10 mA sink; support 3-, 4-, or 5-segment remaining-capacity display |
| RBI | Register backup input | Accepts storage capacitor or backup battery; maintains RAM and flash configuration during main supply dropout |
| SAFE | Safety protection output | Active-low signal for secondary fuse control or hardware shutdown path in conjunction with bq29312 |
Key Features
| Feature | Design Value |
|---|---|
| SBS v1.1 Compliance | Fully implements Smart Battery Data (SBData) commands including RemainingCapacity(), Current(), Temperature(), and PackStatus() registers |
| Programmable Cell Modeling | Enables runtime adjustment of capacity prediction using 16 configurable data flash parameters for rate, temperature, and aging compensation |
| Integrated Time Base | Internal oscillator (±2% freq error) eliminates external crystal; optional 32.768-kHz XTAL supported via XCK1/XCK2 pins |
| LED Display Control | Direct drive of 3–5 LED segments with user-selectable 20%/25%/33% capacity increments; no external driver IC required |
| Co-Processor Interface | Dedicated SDATA/SCLK/CLKOUT lines for deterministic, low-latency communication with bq29312 AFE for cell balancing and protection |
Applications
| Notebook PCs | Medical and Test Equipment |
|---|---|
Use Scenario: Real-time battery run-time prediction and state-of-charge reporting in clamshell laptops with hot-swappable smart battery packs. IC Role / Device Role / Timing Role: Primary fuel gauge IC that computes RemainingCapacity() and FullChargeCapacity() via coulomb counting and voltage-based EDV correction. Use Value: Enables accurate "minutes remaining" display and graceful OS shutdown before deep discharge, leveraging <1 µV offset error and 0.65-nVh resolution. | Use Scenario: Power management in portable ultrasound or patient monitors requiring FDA-compliant battery health tracking and low-voltage safety cutoff. IC Role / Device Role / Timing Role: SBS-compliant gas gauge interfacing with bq29312 AFE to enforce dual-tier overvoltage/overcurrent protection and cell balancing. Use Value: Supports EDV2-triggered capacity correction at battery low % threshold and SAFE output activation for hardware-level fault isolation. |
| Portable Instrumentation | Industrial Handheld Terminals |
Use Scenario: Field-deployable gas analyzers or multimeters operating on rechargeable Li-ion packs with 8–12 hour runtime requirements. IC Role / Device Role / Timing Role: Fuel gauge providing Temperature(), AverageCurrent(), and Voltage() telemetry every 1 s for embedded power optimization algorithms. Use Value: Delivers <1% error in capacity prediction across –20°C to +85°C using integrated 16-bit delta-sigma ADC and programmable NTC thermistor model. | Use Scenario: Ruggedized warehouse scanners and mobile POS terminals requiring reliable battery insertion detection and LED-based charge indication. IC Role / Device Role / Timing Role: System-side gas gauge managing PRES input for pack-insertion detection and driving LED1–LED5 for visual SOC feedback. Use Value: Achieves 250 ms FET turn-on after PRES assertion and supports floating PRES input when NR bit is set in Misc Config. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084RTT-V143 | Same die, 36-pin QFN (RTT) package; 0.5 mm pitch; no exposed pad; higher thermal resistance | Preferred for space-constrained PCBs where TSSOP footprint is prohibitive; requires reflow-compatible layout | Select when board area is critical and thermal load is moderate; verify PCB land pattern against TI SLUS732 package addendum |
| BQ20Z75-V143 | Successor generation with enhanced accuracy (±0.5% SOC), integrated 32.768-kHz oscillator, and extended data flash (2 kB) | Supports newer SBS v1.2 features and higher cell counts (up to 6-series); requires updated firmware stack | Choose for new designs needing improved long-term stability and broader voltage range; not drop-in compatible due to register map changes |
Compared with BQ2084DBT-V143, the RTT variant offers identical functionality in a smaller footprint but reduced thermal performance, while the BQ20Z75-V143 delivers higher accuracy and expanded flash at the cost of firmware migration and non-pin-compatible layout.
Availability
BQ2084DBT-V143 is available at Aetrix Electronics and suitable for notebook PCs, medical instrumentation, portable test equipment, and industrial handheld terminals requiring stable component supply and long-lifecycle support.
Supply support for BQ2084DBT-V143 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 company headquartered in Dallas, Texas, delivering analog and embedded processing solutions for industrial, automotive, and personal electronics markets.
The BQ2084DBT-V143 belongs to TI's battery management IC portfolio, specifically engineered to provide SBS-compliant fuel gauging for multi-cell Li-ion packs in portable computing and mission-critical portable equipment.
FAQ
What is the primary function of the BQ2084DBT-V143 in a smart battery system?
The BQ2084DBT-V143 serves as the core SBS v1.1-compliant fuel gauge IC, performing real-time coulomb counting, voltage/temperature monitoring, and capacity prediction for Li-ion/Li-polymer battery packs. It interfaces with the bq29312 AFE to report RemainingCapacity(), Current(), Temperature(), and PackStatus() over SMBus - all essential for host-controlled power management in systems like notebook PCs and medical devices. The BQ2084DBT-V143 also drives LED indicators and supports firmware-updatable cell modeling.
Does the BQ2084DBT-V143 require an external crystal oscillator?
No, the BQ2084DBT-V143 does not require an external crystal oscillator. It includes an internal oscillator trimmed to ±2% frequency error, enabled by default via the ROSC pin (pin 33). A 100-kΩ resistor (±0.1% tolerance, ±50 ppm drift) connected between ROSC and VSSA suffices for operation. An external 32.768-kHz crystal may be used instead via XCK1/XCK2 pins, but both configurations must not be populated simultaneously. The BQ2084DBT-V143 automatically selects the active time base at power-up.
How does the BQ2084DBT-V143 achieve high-accuracy current measurement?
The BQ2084DBT-V143 achieves high-accuracy current measurement using a self-calibrating integrating sigma-delta ADC with better than 0.65-nVh resolution and <1-µV typical offset error. It continuously monitors the differential voltage across an external sense resistor (SR1–SR2), integrates charge/discharge flow over time, and corrects for temperature and rate effects using programmable cell-modeling coefficients stored in its 1-kByte flash memory. Auto-calibration occurs when SMBus lines remain low for ≥20 s, shorting SR1 to SR2 internally to nullify offset drift - a feature critical for maintaining mAh-level accuracy across temperature and aging.
Can the BQ2084DBT-V143 operate without the bq29312 analog front-end IC?
No, the BQ2084DBT-V143 is co-designed to operate exclusively with the bq29312 AFE IC. It relies on the bq29312 for cell voltage multiplexing (via VIN), protection logic (SAFE, EVENT, PFIN), cell balancing control, and power delivery from the cell stack. The BQ2084DBT-V143 lacks internal high-voltage analog switches, overvoltage/overcurrent comparators, or FET gate drivers - all implemented in the bq29312. While the BQ2084DBT-V143 handles computation and SMBus communication, the bq29312 provides the physical layer safety and sensing infrastructure; neither functions standalone in a compliant smart battery implementation.
What is the role of the RBI pin on the BQ2084DBT-V143?
The RBI (Register Backup Input) pin on the BQ2084DBT-V143 provides a dedicated supply path to retain RAM contents and flash configuration during main VDD dropout. When VDD falls below the power-on reset threshold (~2.1–2.5 V), the RBI pin - connected to a storage capacitor or small backup battery - sustains internal registers and prevents loss of learned FullChargeCapacity(), calibration data, and operational state. This ensures seamless resume after brief interruptions and preserves battery history across power cycles, a requirement for accurate long-term fuel gauging in portable systems. The BQ2084DBT-V143 draws only 10–100 nA from RBI under retention conditions.
BQ2084DBT-V143G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- 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
BQ2084DBT-V143G4 FAQ
1.How can I place an order for BQ2084DBT-V143G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBT-V143G4 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 BQ2084DBT-V143G4 reliable?
The price and inventory of BQ2084DBT-V143G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBT-V143G4 is usually 5 days.
3.What payment methods are accepted for BQ2084DBT-V143G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBT-V143G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBT-V143G4?
BQ2084DBT-V143G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBT-V143G4 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 BQ2084DBT-V143G4?
For technical support, including BQ2084DBT-V143G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBT-V143G4 requirements.
6.How does Aetrix verify that BQ2084DBT-V143G4 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBT-V143G4 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 BQ2084DBT-V143G4 meets industry standards.
7.What is the process for return or replacement of BQ2084DBT-V143G4?
All BQ2084DBT-V143G4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBT-V143G4, 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 BQ2084DBT-V143G4 part is unused and in its original packaging.
Return procedure for BQ2084DBT-V143G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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