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Texas Instruments BQ2084DBT-V123
- Part No.:
- BQ2084DBT-V123
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBT-V123.pdf
- Description:
- IC BATT MON LI-ION 2-4CL 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,441
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Product details
Overview
BQ2084DBT-V123 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 performs coulomb counting with better than 0.65-nVh resolution, integrates a 16-bit delta-sigma ADC for voltage/temperature measurement, and operates with the bq29312 analog front-end to deliver complete pack electronics for 7.2-V, 10.8-V, or 14.4-V systems in portable medical equipment.
For engineers reviewing the BQ2084DBT-V123 datasheet, BQ2084DBT-V123 pinout, BQ2084DBT-V123 application, or BQ2084DBT-V123 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, SBS v1.1 compliance details, and two confirmed alternative gas gauges - all grounded in TI's SLUS619B revision June 2005 documentation.
Technical Context
The BQ2084DBT-V123 implements a self-calibrating integrating ADC for charge/discharge current sensing across SR1/SR2 (±0.25 V range), achieving <1-µV offset error and continuous sampling at 0.65-nVh resolution. Its dual 16-bit delta-sigma converters separately handle current integration and simultaneous cell/pack voltage + temperature acquisition - updated every second during operation.
It executes SBS v1.1–compliant SMBus 2-wire communication (10–100 kHz), supports programmable cell modeling via 1-kB internal flash, and interfaces directly with the bq29312 AFE for cell balancing, overvoltage/undervoltage protection, and thermistor-based temperature monitoring using Semitec 103AT or internal sensor configuration.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - powers analog/digital domains independently (VDDA/VDDD); enables stable operation across industrial temperature range. |
| Current Measurement | Better than 0.65-nVh resolution with self-calibration - ensures sub-1-µV offset error for accurate long-term coulomb counting in portable instrumentation. |
| Voltage/Temperature ADC | 16-bit delta-sigma converter - delivers <1% error on pack/cell voltage and temperature reporting for reliable state-of-charge prediction. |
| SMBus Interface | 10–100 kHz slave-mode timing - compatible with standard system management bus hosts without external clock conditioning. |
| Operating Temperature | –20°C to +85°C - validated for use in notebook PCs and medical devices requiring extended thermal reliability. |
| Internal Flash | 1-kB data flash - stores nominal capacity, self-discharge rate, rate compensation, and cell-modeling parameters for adaptive fuel gauging. |
| Package | 38-pin TSSOP (DBT) - surface-mount footprint optimized for compact battery pack PCB layouts with thermal pad grounding. |
Pinout & Package
Package: 38-pin Thin Shrink Small Outline Package (TSSOP-DBT) with exposed thermal pad; rated for –20°C to +85°C operating temperature.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Cell voltage input | Accepts single-cell voltage from bq29312 CELL output - enables individual cell monitoring and balancing control. |
| SR1 / SR2 | Current sense differential inputs | Monitor ±0.25 V across sense resistor (5–30 mΩ) - provides bipolar current flow detection for charge/discharge accumulation. |
| TS | Thermistor interface | Connects to NTC (e.g., Semitec 103AT) or internal sensor - enables temperature-compensated self-discharge estimation and EDV correction. |
| SMBC / SMBD | SMBus clock/data | Open-drain bidirectional I/O - implements SBS v1.1 communication with host controller for RemainingCapacity(), Voltage(), and Temperature() reads. |
| LED1–LED5 | LED segment drivers | Drive 3–5 external LEDs for 20%/25%/33% remaining capacity indication - eliminates need for external LED controller logic. |
| RBI | Register backup supply | Accepts capacitor or battery input - preserves flash-stored calibration data and register state during main power loss. |
| PRES | System insertion detect | Active-low input - triggers normal operation and FET enable within 250 ms of pack insertion into host system. |
| SAFE | Safety protection output | Active-low signal - drives external fuse or latch for secondary-level overcurrent/overvoltage shutdown per SBS safety requirements. |
Key Features
| Feature | Design Value |
|---|---|
| SBS v1.1 Compliance | Fully implements Smart Battery Data (SBData) commands and charge-control functions - enables plug-and-play integration with compliant host controllers. |
| Integrated Time Base | On-chip oscillator (with 100-kΩ ROSC or 32.768-kHz crystal option) - eliminates external crystal and reduces BOM count while maintaining ±2% frequency accuracy. |
| Programmable Cell Modeling | Configurable via flash registers (DF 0x2a–0xc0) - adapts fuel gauge accuracy to specific Li-ion/Li-polymer chemistry, aging, and temperature profiles. |
| Auto-Calibration | Self-initiated offset cancellation when SMBus lines idle ≥20 s - maintains <1-µV measurement drift without manual calibration steps. |
| LED Display Control | Dedicated DISP input and LED1–LED5 outputs - supports direct drive of segmented indicators for user-facing battery status without MCU intervention. |
Applications
| Medical Portable Monitors | Notebook PC Battery Packs |
|---|---|
|
Use Scenario: Continuous battery-powered ECG and SpO₂ monitoring in field-deployable diagnostic units. IC Role / Device Role / Timing Role: Primary fuel gauge and SMBus interface to host MCU - reports RemainingCapacity(), Temperature(), and Voltage() every second for runtime prediction. Use Value: Enables >99% accurate end-of-discharge warning via EDV2 threshold tracking and compensates for self-discharge during standby - critical for patient safety compliance. |
Use Scenario: Integrated smart battery management in ultraportable laptops with dual-cell (7.2 V) or triple-cell (10.8 V) Li-ion stacks. IC Role / Device Role / Timing Role: SBS v1.1–compliant gas gauge co-located with bq29312 AFE - handles coulomb counting, cell balancing, and SMBus communication to OS power manager. Use Value: Delivers <1% capacity prediction error through combined voltage-based (EDV) and coulomb-counting calibration - extends usable runtime by up to 8% vs. basic voltage-only gauges. |
| Industrial Handheld Testers | Portable Analytical Instruments |
|
Use Scenario: Battery-operated multimeters and insulation testers used in uncontrolled ambient conditions (-10°C to +60°C). IC Role / Device Role / Timing Role: Fuel gauge with temperature-compensated self-discharge modeling - uses TS input and internal flash programming to adapt to seasonal thermal cycles. Use Value: Maintains ±3% SoC accuracy across temperature swings by applying learned discharge curves stored in 1-kB flash - avoids premature shutdown during cold starts. |
Use Scenario: Field-deployable gas chromatographs and spectrometers requiring precise battery life estimation for mission-critical data collection. IC Role / Device Role / Timing Role: High-resolution coulomb counter interfacing with bq29312 for cell-level voltage monitoring and balancing - updates RM register every second. Use Value: Achieves better than 0.65-nVh resolution to detect microamp-level leakage currents - essential for multi-hour uninterrupted operation with low-power sensors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2085DBT-V123 | Same pinout, identical SBS v1.1 firmware, but includes enhanced EEPROM write endurance (50k cycles vs. 20k) and improved low-temperature performance below –20°C. | Preferred for outdoor industrial instruments requiring extended cold-weather operation and frequent flash reprogramming. | Select BQ2085DBT-V123 only if field firmware updates or sub–20°C deployment are required - otherwise BQ2084DBT-V123 offers full functional equivalence at lower cost. |
| BQ20Z75-V123 | Successor device with integrated 20-V AFE, higher-resolution 18-bit ADC, and support for SBS v1.2 - not pin-compatible; requires PCB redesign. | Targets next-gen smart batteries needing higher voltage tolerance (up to 20 V), tighter accuracy (<0.5%), and extended diagnostics. | Choose BQ20Z75-V123 for new designs demanding future-proof SBS compliance and higher precision - BQ2084DBT-V123 remains optimal for cost-sensitive, volume-manufactured SBS v1.1 systems. |
Compared with BQ2085DBT-V123, the BQ2084DBT-V123 trades minor EEPROM endurance and cold-temperature margin for proven stability in high-volume notebook and medical applications; versus BQ20Z75-V123, it offers drop-in compatibility with existing bq29312-based layouts and lower system-level BOM cost despite lacking SBS v1.2 features.
Availability
BQ2084DBT-V123 is available at Aetrix Electronics and suitable for notebook PCs, portable medical monitors, handheld test equipment, and analytical instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for BQ2084DBT-V123 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 - serving automotive, industrial, and computing markets since 1930.
The BQ2084DBT-V123 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for SBS v1.1–compliant Li-ion/Li-polymer battery packs in portable computing and medical devices where accuracy, safety, and SMBus interoperability are mandatory.
FAQ
What is the primary function of the BQ2084DBT-V123 in a smart battery system?
The BQ2084DBT-V123 serves as the core SBS v1.1–compliant gas gauge IC, performing high-accuracy coulomb counting, voltage/temperature monitoring, and SMBus communication to report RemainingCapacity(), Voltage(), and Temperature() to the host system. It works in tandem with the bq29312 AFE to provide full pack-level protection and cell balancing - making it essential for reliable runtime prediction in devices like notebook PCs and portable medical monitors. The BQ2084DBT-V123 achieves this using its self-calibrating integrating ADC and 1-kB internal flash for adaptive cell modeling.
Does the BQ2084DBT-V123 require an external crystal oscillator?
No - the BQ2084DBT-V123 includes an integrated oscillator that can operate with either a 100-kΩ resistor on the ROSC pin (XCK2) or a 32.768-kHz crystal between XCK1 and XCK2. TI's SLUS619B datasheet specifies that only one option should be used: the internal oscillator (ROSC) or the external crystal - not both. The internal solution eliminates BOM cost and board space, while maintaining ±2% frequency accuracy over temperature, making the BQ2084DBT-V123 suitable for cost-sensitive and space-constrained applications such as handheld test equipment.
How does the BQ2084DBT-V123 achieve accurate state-of-charge estimation?
The BQ2084DBT-V123 combines coulomb counting with voltage-based correction using three programmable end-of-discharge thresholds (EDV0, EDV1, EDV2). Its integrating ADC provides better than 0.65-nVh resolution for current integration, while its 16-bit delta-sigma ADC measures cell/pack voltage and temperature every second. During qualified discharges, it learns the true FullChargeCapacity() and applies temperature- and rate-compensated EDV corrections to the RemainingCapacity() register - delivering <1% error in real-world notebook PC and medical monitor deployments. This dual-method approach is central to the BQ2084DBT-V123's fuel gauge accuracy.
Can the BQ2084DBT-V123 drive LEDs directly without external components?
Yes - the BQ2084DBT-V123 integrates five dedicated LED drivers (LED1–LED5) and a DISP control input, enabling direct connection to external LEDs for remaining capacity indication in 3-, 4-, or 5-segment configurations. Each driver supports 10-mA sink current with 0.4-V VOL, eliminating the need for external transistors or current-limiting resistors in most designs. This capability is explicitly documented in TI's SLUS619B datasheet and is used in production notebook battery packs to reduce component count and simplify layout - a key design value of the BQ2084DBT-V123.
What is the role of the RBI pin on the BQ2084DBT-V123?
The RBI (Register Backup Input) pin on the BQ2084DBT-V123 provides a backup power source (≥1.3 V) to retain critical data-flash contents and register states during main supply interruption. When VDD drops below the power-on reset threshold (VIT ≈ 2.3 V), the BQ2084DBT-V123 switches to RBI-supplied power to preserve learned FullChargeCapacity(), calibration coefficients, and configuration settings - ensuring no loss of fuel gauge history or accuracy after brief power loss. This feature is vital for medical and industrial applications where battery removal or intermittent charging must not reset capacity learning. The BQ2084DBT-V123 specifies 10–100 nA RBI input current to minimize backup source drain.
BQ2084DBT-V123 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-V123 FAQ
1.How can I place an order for BQ2084DBT-V123 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBT-V123 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-V123 reliable?
The price and inventory of BQ2084DBT-V123 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBT-V123 is usually 5 days.
3.What payment methods are accepted for BQ2084DBT-V123?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBT-V123 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBT-V123?
BQ2084DBT-V123 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBT-V123 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-V123?
For technical support, including BQ2084DBT-V123 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBT-V123 requirements.
6.How does Aetrix verify that BQ2084DBT-V123 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBT-V123 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-V123 meets industry standards.
7.What is the process for return or replacement of BQ2084DBT-V123?
All BQ2084DBT-V123 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBT-V123, 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-V123 part is unused and in its original packaging.
Return procedure for BQ2084DBT-V123:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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