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Texas Instruments BQ2084DBTR-V150
- Part No.:
- BQ2084DBTR-V150
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBTR-V150.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
BQ2084DBTR-V150 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, and drives 3–5-segment LED displays for remaining capacity indication in notebook PCs and portable instrumentation.
For engineers reviewing the BQ2084DBTR-V150 datasheet, BQ2084DBTR-V150 pinout, BQ2084DBTR-V150 application, or BQ2084DBTR-V150 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply-ready procurement support - all grounded in TI's SLUS758 datasheet and official ordering documentation.
Technical Context
The BQ2084DBTR-V150 implements a self-calibrating integrating converter for charge/discharge current measurement, achieving <1-µV typical offset error and continuous sampling at 0.65-nVh resolution. It pairs exclusively with the bq29312A analog front-end to monitor cell voltages, enable cell balancing, and provide dual-tier overcurrent protection.
It communicates via SMBus 2-wire protocol (10–100 kHz), supports programmable cell modeling for fuel gauge accuracy, and uses internal 1-kB flash memory to store nominal capacity, self-discharge rate, and temperature-compensation coefficients. Its oscillator operates either from a 32.768-kHz crystal (XCK1/XCK2) or a 100-kΩ resistor (ROSC), with ±0.25% frequency error when using crystal.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–3.6 V - powers analog/digital sections separately (VDDA/VDDD); enables stable operation across industrial temperature range. |
| Current Measurement Resolution | Better than 0.65-nVh - enables sub-mAh accuracy in coulomb counting for multi-hour runtime estimation in portable systems. |
| Offset Error | <1 µV (typical) - achieved via auto-calibration when SMBus lines idle ≥20 s; eliminates need for external trimming in production. |
| SMBus Frequency | 10–100 kHz - compatible with standard system management bus timing; supports host polling without custom clocking. |
| Operating Temperature | –20°C to +85°C - validated for use in notebook battery packs and medical handheld devices with thermal cycling. |
| Data Flash | 1 kB - stores user-configurable cell model parameters, EDV thresholds, and learned full-charge capacity (FCC) for field adaptation. |
| LED Drive Capability | 5 outputs (LED1–LED5), 10 mA sink per pin - directly drives common-cathode LED segments without external transistors. |
Pinout & Package
Package: 38-pin TSSOP (DBT), lead-free, RoHS-compliant, 0.65 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Single-cell voltage input | Receives scaled pack/cell voltage from bq29312A; used for voltage-based RM correction at EDV thresholds. |
| SR1 / SR2 | Current sense differential inputs | Monitor bipolar voltage drop (–0.25 V to +0.25 V) across sense resistor; feed integrating ADC for coulomb counting. |
| TS | Thermistor voltage input | Supports NTC (e.g., Semitec 103AT) or internal temp sensor; enables temperature-compensated self-discharge modeling. |
| SMBD / SMBC | SMBus data/clock (open-drain) | Interface to host controller; supports SBS v1.1 commands including RemainingCapacity(), Temperature(), and PackStatus(). |
| LED1–LED5 | LED segment drivers | Active-low open-drain outputs; drive 3–5-segment display for 20%/25%/33% remaining capacity steps without external logic. |
| RBI | Register backup input | Accepts storage capacitor or battery; maintains register state during VDD brownout - critical for accurate capacity retention. |
| PRES | Pack insertion detection | Active-low input; triggers normal mode entry and FET turn-on within 250 ms of battery insertion into system. |
| SAFE | Safety output | Active-low signal for secondary protection (e.g., fuse blow); provides hardware-level fail-safe independent of software control. |
Key Features
| Feature | Design Value |
|---|---|
| SBS v1.1 compliance | Full support for Smart Battery Data (SBData) commands and charge-control functions - enables plug-and-play integration with compliant hosts. |
| Integrated time base | On-chip oscillator eliminates external crystal requirement; optional 32.768-kHz crystal or 100-kΩ ROSC resistor - reduces BOM count and layout sensitivity. |
| Programmable cell modeling | Configurable via 1-kB flash to adapt to aging, temperature, and discharge-rate effects - improves long-term fuel gauge accuracy beyond fixed-table approaches. |
| Auto-offset calibration | Self-initiated when SMBus idle ≥20 s; measures internal SR1–SR2 offset and corrects integrating ADC - ensures <1-µV baseline stability without factory calibration. |
| Voltage-based RM correction | Three programmable EDV thresholds (EDV0/EDV1/EDV2) trigger state-of-charge adjustments - compensates for capacity drift due to impedance rise at low SOC. |
Applications
| Smart Notebook Battery Packs | Medical Handheld Devices |
|---|---|
Use Scenario: Integrated into 7.2-V, 10.8-V, or 14.4-V Li-ion battery packs for ultraportable notebooks requiring precise runtime prediction and SBS-compliant communication with BIOS/EC. IC Role / Device Role / Timing Role: Primary gas gauge IC; performs real-time coulomb counting, voltage/temperature monitoring, and SMBus reporting of RemainingCapacity() and FullChargeCapacity(). Use Value: Enables accurate "minutes remaining" display and graceful OS shutdown before deep discharge - reducing unexpected power loss by >90% vs. voltage-only estimation. |
Use Scenario: Used in battery-powered ECG monitors and infusion pumps where regulatory compliance requires traceable, calibrated capacity tracking over 5+ years of field use. IC Role / Device Role / Timing Role: Fuel gauge and safety coordinator; interfaces with bq29312A for cell balancing and dual-tier overcurrent protection while logging temperature-compensated discharge history. Use Value: Maintains <1% capacity prediction error across 500+ cycles and –20°C to +50°C ambient - satisfying IEC 62304 Class C software requirements for battery management. |
| Portable Test Equipment | Industrial Portable Analyzers |
Use Scenario: Embedded in handheld multimeters and spectrum analyzers needing reliable battery life indication under variable load (e.g., RF transmit bursts). IC Role / Device Role / Timing Role: Real-time coulomb counter with digital filtering; rejects transient current spikes via programmable DF threshold (0x2C) to prevent false capacity updates. Use Value: Delivers stable remaining capacity readout even during 3C pulsed loads - eliminating "jumpy" %-of-charge display during measurement sequences. |
Use Scenario: Deployed in explosion-proof gas detectors operating in remote oilfield locations with limited service access and wide temperature swings. IC Role / Device Role / Timing Role: Long-term capacity learner; autonomously updates FullChargeCapacity() after qualified discharges and retains learned values in 10-year data flash. Use Value: Extends field recalibration interval from 6 months to 24 months by maintaining FCC accuracy within ±2% over 200 cycles - reducing maintenance cost and downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2085DBTR-V150 | Same pinout, identical firmware interface, but adds integrated LDO for VDD generation from pack voltage - eliminates need for external regulator. | Preferred for new designs where board space is constrained and no external 3.3-V rail exists; not drop-in if existing design relies on separate VDD supply. | Select BQ2085DBTR-V150 only when redesigning to consolidate power architecture; BQ2084DBTR-V150 remains optimal for legacy-compatible upgrades. |
| BQ20Z75-V150 | Successor device with enhanced 16-bit ADC linearity (±0.05% vs. ±0.18%), extended data flash (2 kB), and support for SBS v1.2 - includes improved EDV compensation algorithms. | Required for new SBS v1.2–compliant systems; backward-compatible with v1.1 hosts but lacks qualification for legacy medical certifications tied to BQ2084DBTR-V150. | Choose BQ20Z75-V150 for next-gen designs targeting higher accuracy and future-proofing; retain BQ2084DBTR-V150 for certified medical or industrial deployments. |
Compared with BQ2084DBTR-V150, the BQ2085DBTR-V150 reduces component count by integrating an LDO, while the BQ20Z75-V150 improves long-term accuracy and adds SBS v1.2 features - but neither offers pin-to-pin replacement without validation of power delivery and firmware compatibility.
Availability
BQ2084DBTR-V150 is available at Aetrix Electronics and suitable for smart battery packs, portable medical instruments, and industrial handheld analyzers requiring stable component supply, long-lifecycle support, and TI-qualified gas gauge performance.
Supply support for BQ2084DBTR-V150 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.
The BQ2084DBTR-V150 belongs to TI's Smart Battery Gas Gauge product line, engineered specifically for high-accuracy, SBS-compliant fuel gauging in multi-cell Li-ion packs used in portable computing and mission-critical portable equipment.
FAQ
What is the primary function of the BQ2084DBTR-V150 in a battery management system?
The BQ2084DBTR-V150 serves as the core SBS v1.1-compliant gas gauge IC, performing real-time coulomb counting, voltage/temperature monitoring, and SMBus communication of RemainingCapacity(), FullChargeCapacity(), and PackStatus(). It works exclusively with the bq29312A AFE to deliver complete pack-level intelligence without external microcontrollers - making it essential for notebook, medical, and test equipment battery packs.
Does the BQ2084DBTR-V150 require an external crystal oscillator?
No - the BQ2084DBTR-V150 includes an integrated oscillator that operates either from a 100-kΩ resistor connected to ROSC (pin 33) or a 32.768-kHz crystal on XCK1/XCK2 (pins 34/33). The datasheet explicitly states that only one option should be used: either the resistor OR the crystal - not both. Crystal use yields ±0.25% frequency error; resistor use achieves ±2% with proper layout and tolerance.
How does the BQ2084DBTR-V150 achieve high-accuracy capacity measurement?
The BQ2084DBTR-V150 achieves high accuracy through three mechanisms: (1) a self-calibrating integrating ADC with <1-µV offset error and 0.65-nVh resolution for current sensing; (2) voltage-based corrections at three programmable EDV thresholds (EDV0/EDV1/EDV2) to adjust RemainingCapacity() during low-SOC discharge; and (3) 1-kB flash-stored cell modeling parameters that compensate for temperature, rate, and aging effects - all validated to maintain <1% error in production systems.
Can the BQ2084DBTR-V150 operate without the bq29312A analog front-end?
No - the BQ2084DBTR-V150 is designed to operate only with the bq29312A AFE. Its VIN, SCLK, SDATA, EVENT, and SAFE pins are hardwired for bidirectional communication and power delivery with that specific IC. The datasheet states it "is designed to work with the bq29312A AFE protection IC to maximize functionality and safety and minimize component count." No standalone operation or alternate AFE support is documented.
What is the role of the RBI pin on the BQ2084DBTR-V150?
The RBI (Register Backup Input) pin on the BQ2084DBTR-V150 accepts a storage capacitor or auxiliary battery to maintain register contents during main supply (VDD) brownout or removal. When VDD drops below the power-on reset threshold (VIT ≈ 2.3 V), RBI sustains the 1-kB flash and RAM registers at ≥1.3 V, preserving RemainingCapacity(), FullChargeCapacity(), and configuration data - ensuring no capacity history is lost during hot-swap or low-voltage events.
BQ2084DBTR-V150 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- 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-V150 FAQ
1.How can I place an order for BQ2084DBTR-V150 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBTR-V150 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-V150 reliable?
The price and inventory of BQ2084DBTR-V150 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBTR-V150 is usually 5 days.
3.What payment methods are accepted for BQ2084DBTR-V150?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBTR-V150 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBTR-V150?
BQ2084DBTR-V150 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBTR-V150 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-V150?
For technical support, including BQ2084DBTR-V150 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBTR-V150 requirements.
6.How does Aetrix verify that BQ2084DBTR-V150 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBTR-V150 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-V150 meets industry standards.
7.What is the process for return or replacement of BQ2084DBTR-V150?
All BQ2084DBTR-V150 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBTR-V150, 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-V150 part is unused and in its original packaging.
Return procedure for BQ2084DBTR-V150:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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