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Texas Instruments BQ2084DBT-V133G4
- Part No.:
- BQ2084DBT-V133G4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBT-V133G4.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,482
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Product details
Overview
BQ2084DBT-V133 from Texas Instruments is a Smart Battery Specification (SBS) v1.1-compliant gas gauge IC designed for Li-ion/Li-polymer battery packs. It performs coulomb counting with <0.65-nVh resolution, integrates a 16-bit delta-sigma ADC for voltage/temperature measurement, and works in tandem with the bq29312 AFE to deliver full pack electronics for 7.2-V to 14.4-V systems in notebook PCs and portable medical instrumentation.
For engineers reviewing the BQ2084DBT-V133 datasheet, BQ2084DBT-V133 pinout, BQ2084DBT-V133 application, or BQ2084DBT-V133 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 with documented functional trade-offs.
Technical Context
The BQ2084DBT-V133 implements a self-calibrating 16-bit integrating ADC for charge/discharge current sensing across SR1–SR2 (±0.25 V range), achieving <1-µV offset error. Its dual sigma-delta architecture separately handles current integration and 16-bit voltage/temperature sampling at 1 Hz update rate.
It operates as the system-level fuel gauge controller in an SBS v1.1 architecture-communicating via SMBus 2-wire interface (10–100 kHz), driving LED segments directly, and coordinating protection, cell balancing, and voltage translation through dedicated control signals (SAFE, CLKOUT, EVENT) to the bq29312 AFE.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–3.6 V - powers analog (VDDA) and digital (VDDD) domains independently; supports operation across full industrial temperature range. |
| Current Measurement | <0.65-nVh resolution, <1-µV offset - enables sub-mAh accuracy in coulomb counting over multi-hour discharge cycles. |
| SMBus Interface | 10–100 kHz slave mode - compatible with standard system management bus controllers without custom timing logic. |
| Operating Temp | –20°C to +85°C - validated for use in portable computing and medical equipment enclosures with passive thermal management. |
| Data Flash | 1 kB internal flash - stores programmable cell models, EDV thresholds, self-discharge rates, and learned FCC values with 10-year retention. |
| ADC Resolution | 16-bit delta-sigma - provides ≤1% error in voltage, temperature, and capacity prediction under dynamic load conditions. |
| LED Drive | 5-segment LED outputs (LED1–LED5) - supports direct connection to discrete LEDs for remaining capacity indication without external drivers. |
Pinout & Package
Package: 38-pin TSSOP (DBT), 0.65 mm pitch, body size 12.5 × 6.1 mm - surface-mount compatible with standard reflow profiles and automated assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Current sense differential input | Accepts ±0.25 V across external sense resistor; enables high-accuracy coulomb counting with auto-offset calibration. |
| VIN | Cell voltage input | Receives scaled individual cell voltage from bq29312 CELL pin; used for per-cell monitoring and EDV threshold detection. |
| TS | Thermistor input | Supports NTC (e.g., Semitec 103AT) or internal temperature sensor; critical for self-discharge compensation and EDV rate adjustment. |
| SMBC / SMBD | SMBus clock/data | Open-drain bidirectional I/O - interfaces directly with host system SMBus controller for SBS v1.1 command exchange (e.g., RemainingCapacity, Voltage). |
| LED1–LED5 | LED segment drivers | Active-low open-drain outputs - drive external LEDs in 3-/4-/5-segment configurations for visual state-of-charge feedback. |
| SAFE | Safety fault output | Active-low signal to external fuse or protection circuit - asserts on critical faults (e.g., overvoltage, overcurrent) detected by bq29312 coordination. |
| PRES | System insertion detect | Active-low input - triggers normal operation and FET enable within 250 ms of pack insertion into host system. |
Key Features
| Feature | Design Value |
|---|---|
| SBS v1.1 Compliance | Fully implements SBData commands (e.g., AtRate, TimeToEmpty) and charge-control functions required for interoperability with compliant smart battery hosts. |
| Integrated Time Base | Internal 32.768-kHz oscillator (±2% error) or external crystal option - eliminates need for external timing components while maintaining SMBus synchronization. |
| Programmable Cell Modeling | Configurable via 1 kB flash - adjusts capacity estimation for temperature, discharge rate, and aging using user-defined coefficients (DF 0x95–0xc0). |
| Auto-Calibrating Integrating ADC | Performs on-demand offset cancellation (<1 µV residual) by shorting SR1–SR2 during SMBus idle - ensures long-term current measurement stability without manual recalibration. |
| LED Display Integration | Direct 5-segment driver outputs - reduces BOM count and PCB area vs. external LED drivers; supports 20%/25%/33% capacity step indication. |
Applications
| Notebook PC Battery Management | Portable Medical Instrumentation |
|---|---|
|
Use Scenario: Integrated into removable Li-ion battery packs for business-class laptops requiring accurate runtime prediction and SBS v1.1 host communication. IC Role / Device Role / Timing Role: Primary fuel gauge controller that maintains RemainingCapacity(), communicates via SMBus, and drives LED status indicators. Use Value: Enables precise low-battery warnings and graceful OS shutdown by delivering <1% capacity prediction error across temperature and aging conditions. |
Use Scenario: Used in battery-powered handheld diagnostic devices (e.g., ultrasound probes, glucose meters) where regulatory compliance and runtime reliability are critical. IC Role / Device Role / Timing Role: Core gas gauge managing charge/discharge accounting, temperature-compensated self-discharge, and EDV-based safety cutoffs. Use Value: Supports FDA-aligned power management by providing traceable, flash-stored capacity learning and fail-safe SAFE output activation on overvoltage events. |
| Industrial Portable Test Equipment | High-Accuracy Field Calibration Tools |
|
Use Scenario: Embedded in ruggedized multimeters and oscilloscope battery packs operating in variable ambient temperatures (-20°C to +85°C). IC Role / Device Role / Timing Role: Fuel gauge with integrated thermistor interface and programmable EDV thresholds for environment-aware capacity correction. Use Value: Delivers stable runtime estimates despite thermal cycling, using internal temperature sensor or calibrated NTC inputs with ≤1% error. |
Use Scenario: Deployed in metrology-grade handheld calibrators requiring long-term capacity consistency and field-updatable cell models. IC Role / Device Role / Timing Role: Flash-programmable gas gauge supporting post-deployment tuning of discharge rate compensation and aging factors. Use Value: Allows OEMs to refine fuel gauge accuracy in deployed units via SMBus writes to data flash locations DF 0x2a–0xc0 without hardware change. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z75-V163 | Higher integration: includes integrated AFE, 2-cell support, and enhanced SBS v1.1+ features (e.g., authentication); no external bq29312 required. | Reduces total component count but requires redesign of protection circuitry and firmware adaptation for extended SBS registers. | Select when consolidating AFE + gauge functionality is prioritized over reuse of existing bq29312-based layout. |
| BQ20Z65-V133 | Same pinout and firmware-compatible variant with updated flash programming algorithm and improved low-current measurement linearity below 10 mA. | Drop-in replacement for legacy BQ2084DBT-V133 designs; retains identical SMBus register map and LED driver behavior. | Select for production continuity where minimal validation effort and unchanged PCB layout are mandatory. |
Compared with BQ2084DBT-V133, the BQ20Z65-V133 offers identical form-factor and register compatibility with improved low-current accuracy, while the BQ20Z75-V163 replaces both gauge and AFE but demands full system-level requalification due to expanded feature set and security functions.
Availability
BQ2084DBT-V133 is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical instrumentation, and industrial test equipment requiring stable component supply, long-lifecycle support, and SBS v1.1 compliance.
Supply support for BQ2084DBT-V133 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 BQ2084DBT-V133 belongs to TI's Smart Battery Fuel Gauge product line, engineered specifically for high-accuracy, SBS-compliant Li-ion/Li-polymer battery monitoring in portable computing and mission-critical portable electronics.
FAQ
What is the primary function of the BQ2084DBT-V133 in a smart battery system?
The BQ2084DBT-V133 serves as the core SBS v1.1-compliant fuel gauge IC, performing real-time coulomb counting, voltage/temperature monitoring, and capacity prediction. It communicates remaining capacity, time-to-empty, and health metrics to the host system via SMBus, while coordinating protection and cell balancing functions with the bq29312 AFE. The BQ2084DBT-V133 is essential for accurate runtime estimation and safe battery operation in compliant smart battery packs.
Does the BQ2084DBT-V133 require an external crystal oscillator?
No-the BQ2084DBT-V133 includes an internal 32.768-kHz oscillator that uses a 100-kΩ resistor on ROSC (pin 33) for timing. An external crystal may be used instead by connecting it between XCK1 (pin 34) and XCK2 (pin 33), but both options are mutually exclusive. The internal oscillator achieves ±2% frequency accuracy and eliminates the need for external timing components unless tighter tolerance is required.
How does the BQ2084DBT-V133 handle temperature compensation for capacity estimation?
The BQ2084DBT-V133 supports both external NTC thermistors (e.g., Semitec 103AT on TS pin) and its internal temperature sensor. Temperature data feeds into programmable flash-based coefficients (DF 0xb5–0xc0) to adjust self-discharge modeling and EDV threshold calculation. This enables <1% capacity prediction error across –20°C to +85°C, critical for medical and industrial applications where thermal variation impacts runtime accuracy.
Can the BQ2084DBT-V133 operate without the bq29312 AFE?
No-the BQ2084DBT-V133 is architecturally dependent on the bq29312 AFE for cell voltage monitoring, protection FET control, and cell balancing. Its VIN, SAFE, CLKOUT, and EVENT pins are explicitly designed for interoperation with the bq29312. While the BQ2084DBT-V133 handles computation and communication, the bq29312 provides the analog front-end and safety layer; neither IC is functionally complete without the other in this reference design.
What is the role of the 1 kB internal flash memory in the BQ2084DBT-V133?
The 1 kB internal flash stores user-configurable parameters including nominal capacity/voltage, self-discharge rate, rate/temperature compensation coefficients, EDV thresholds, and learned FullChargeCapacity (FCC) values. It enables field-updatable cell modeling and retains calibration data for ≥10 years. Flash programming requires 8–12 mA supply current and supports up to 20,000 write cycles-making it suitable for factory configuration and post-deployment tuning of the BQ2084DBT-V133.
BQ2084DBT-V133G4 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-V133G4 FAQ
1.How can I place an order for BQ2084DBT-V133G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBT-V133G4 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-V133G4 reliable?
The price and inventory of BQ2084DBT-V133G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBT-V133G4 is usually 5 days.
3.What payment methods are accepted for BQ2084DBT-V133G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBT-V133G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBT-V133G4?
BQ2084DBT-V133G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBT-V133G4 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-V133G4?
For technical support, including BQ2084DBT-V133G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBT-V133G4 requirements.
6.How does Aetrix verify that BQ2084DBT-V133G4 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBT-V133G4 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-V133G4 meets industry standards.
7.What is the process for return or replacement of BQ2084DBT-V133G4?
All BQ2084DBT-V133G4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBT-V133G4, 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-V133G4 part is unused and in its original packaging.
Return procedure for BQ2084DBT-V133G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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