My Inquiry
My Account
Texas Instruments BQ2084DBT-V143
- Part No.:
- BQ2084DBT-V143
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2084DBT-V143.pdf
- Description:
- IC GAS GAUGE FOR BQ29312 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:610
Please send an inquiry. Send us your inquiry, and we will respond immediately.
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, featuring a 16-bit delta-sigma integrating ADC for current measurement (better than 0.65-nVh resolution, <1-µV offset error), integrated 1-kB flash memory for programmable cell modeling, and SMBus 2-wire interface for host communication in notebook PCs and portable instrumentation.
For engineers reviewing the BQ2084DBT-V143 datasheet, BQ2084DBT-V143 pinout, BQ2084DBT-V143 application, or BQ2084DBT-V143 equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternative parts with functional distinctions, and supply-ready availability details - all grounded in TI's SLUS732 datasheet and official package documentation.
Technical Context
The BQ2084DBT-V143 implements coulomb counting via a self-calibrating 16-bit integrating ADC on SR1/SR2 pins, continuously sampling charge/discharge flow with sub-µV offset correction. It pairs exclusively with the bq29312 AFE to monitor individual cell voltages, enable cell balancing, and drive protection FETs - no standalone operation.
Its RISC CPU executes SBS v1.1 commands (e.g., RemainingCapacity, Voltage, Temperature) over SMBus at up to 100 kHz, while internal flash stores configuration parameters including nominal capacity, self-discharge rate, and temperature-compensated EDV thresholds. LED drivers (LED1–LED5) support 3–5-segment remaining-capacity indication without external components.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 3.0–3.6 V - powers analog (VDDA/VSSA) and digital (VDDD/VSSD) domains separately; supports operation across full –20°C to 85°C industrial range. |
| Current measurement ADC | 16-bit delta-sigma integrating converter - achieves <1-µV typical offset error and better than 0.65-nVh resolution for accurate coulomb counting in portable Li-ion systems. |
| SMBus interface | 2-wire open-drain, 10–100 kHz - compliant with SBS v1.1; enables host access to RemainingCapacity(), FullChargeCapacity(), Voltage(), Temperature(), and PackStatus() registers. |
| Internal flash memory | 1 kB data flash - stores programmable cell-modeling factors (e.g., rate/temperature compensation), nominal capacity, and learned full-charge capacity (FCC) with 10-year retention. |
| Operating temperature | –20°C to +85°C - specified for continuous operation; enables deployment in notebook PCs, medical equipment, and industrial portable instruments. |
| Package | 38-pin TSSOP (DBT) - surface-mount, 0.65-mm pitch; pin-compatible with bq2084RTT-V143 QFN variant but requires PCB redesign due to different thermal and mechanical footprint. |
| LED drive capability | 5-channel open-drain outputs (LED1–LED5) - each drives 10 mA; supports 20%/25%/33% remaining-capacity segmentation without external drivers or resistors. |
Pinout & Package
38-pin Thin Shrink Small Outline Package (TSSOP, DBT), 12.5 mm × 6.1 mm × 1.2 mm body, 0.65 mm lead pitch, exposed thermal pad (not electrically connected). Pin 1 marked by dot; top-side marking includes "BQ2084" and date code.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| SR1 / SR2 | Current sense differential input | Measures bipolar voltage drop (–0.25 V to +0.25 V) across external sense resistor; feeds integrating ADC for coulomb counting with auto-offset calibration. |
| VIN | Analog voltage input | Receives scaled cell/pack voltage from bq29312 AFE; used for Voltage(), VCELL1–VCELL4 reporting and EDV threshold detection. |
| TS | Temperature sensor input | Accepts NTC thermistor (e.g., Semitec 103AT) or internal sensor; enables temperature-compensated self-discharge estimation and FCC learning. |
| SMBD / SMBC | SMBus bidirectional data/clock | Open-drain I/O; implements SBS v1.1 command protocol (e.g., Read Word, Block Read) with 10–100 kHz timing compliance. |
| LED1–LED5 | LED segment drivers | Open-drain outputs; directly drive external LEDs for visual state-of-charge indication in 3-, 4-, or 5-segment configurations. |
| PRES | System insertion detection | Active-low input; signals pack insertion into host system, triggering normal operation mode and discharge FET turn-on within 250 ms. |
| RBI | Register backup supply | Accepts storage capacitor or backup battery; maintains RAM/register state during main supply brownout or removal (e.g., hot-swap scenarios). |
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 SBS-compliant hosts without custom firmware. |
| Programmable cell modeling | Configurable via 1-kB flash to adapt fuel-gauge accuracy to specific Li-ion/Li-polymer chemistries, aging, temperature, and discharge-rate profiles. |
| Auto-offset calibration | Performs <1-µV offset cancellation on SR1/SR2 during SMBus idle (>20 s low), eliminating manual calibration and ensuring long-term coulomb-counting stability. |
| Integrated time base | On-chip oscillator (internal 100-kΩ ROSC or external 32.768-kHz crystal) removes need for external crystal - reduces BOM count and layout sensitivity. |
| LED display control | Dedicated 5-segment drivers with configurable increment logic (20%/25%/33%) - provides immediate visual SOC feedback without MCU intervention or external logic. |
Applications
| Notebook PC Battery Management | Medical Portable Diagnostic Device |
|---|---|
Use Scenario: Integrated into removable Li-ion battery packs for Windows-based laptops requiring precise runtime prediction and SBS-compliant host communication. IC Role / Device Role / Timing Role: Primary gas gauge IC; performs real-time coulomb counting, voltage/temperature monitoring, and SMBus reporting of RemainingCapacity(), AtRate(), and TimeToEmpty(). Use Value: Enables accurate battery-level UI rendering and OS-level power management decisions - reducing unexpected shutdowns by maintaining ±1% capacity prediction error after learning cycles. |
Use Scenario: Embedded in sealed, rechargeable battery modules for handheld ultrasound or blood glucose analyzers needing FDA-grade charge tracking and safety logging. IC Role / Device Role / Timing Role: Fuel gauge and safety coordinator; interfaces with bq29312 AFE to enforce dual-tier overvoltage/overcurrent protection and log discharge history to flash. Use Value: Supports regulatory traceability via stored FCC/DCR history and temperature-compensated EDV thresholds - meeting IEC 62304 Class B software requirements for medical battery systems. |
| Industrial Portable Test Equipment | High-Reliability Field Instrumentation |
Use Scenario: Used in battery-powered oscilloscopes and multimeters operating in variable ambient temperatures (–20°C to 60°C) with multi-cell 7.2–14.4 V packs. IC Role / Device Role / Timing Role: Core capacity estimator; leverages programmable cell modeling and internal temperature sensor option to maintain accuracy across wide thermal gradients. Use Value: Delivers stable runtime estimates despite rapid load transients and thermal drift - critical for field technicians relying on single-charge operation during extended deployments. |
Use Scenario: Deployed in explosion-proof gas detectors and environmental sensors requiring >5-year field life and guaranteed low-power storage mode (<8 µA). IC Role / Device Role / Timing Role: Long-term energy accounting unit; uses RBI-supplied register backup and low-power storage mode to retain state during infrequent usage intervals. Use Value: Eliminates periodic recalibration; preserves learned FCC and self-discharge parameters across years of intermittent operation - reducing maintenance overhead and calibration downtime. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2085DBT-V143 | Same DBT package and pinout; adds enhanced cell-balancing control logic and improved EDV temperature compensation algorithm per SLUS777. | Targeted for higher-cell-count (5–6S) packs requiring tighter voltage matching; not validated for 3S/4S use cases where BQ2084DBT-V143 is qualified. | Select BQ2085DBT-V143 only if cell-balancing precision and extended temperature compensation are required - otherwise BQ2084DBT-V143 offers lower cost and proven qualification for 3–4S notebook packs. |
| BQ20Z75-V143 | Successor device with integrated AFE (no bq29312 dependency); 48-pin TSSOP; supports SBS v1.1 + v2.0 extensions and SHA-1 authentication. | Designed for next-gen smart batteries requiring cryptographic security and autonomous protection - incompatible with existing bq29312-based layouts and firmware. | Choose BQ20Z75-V143 for new designs needing tamper-resistant fuel gauging and reduced component count; retain BQ2084DBT-V143 for legacy bq29312-based platforms or cost-sensitive volume production. |
Compared with BQ2085DBT-V143 and BQ20Z75-V143, the BQ2084DBT-V143 delivers optimal balance of SBS v1.1 compliance, proven reliability in 3–4S notebook packs, and minimal BOM dependency on the bq29312 - making it the preferred choice for cost-constrained, high-volume portable instrumentation where advanced security or 5S+ balancing is unnecessary.
Availability
BQ2084DBT-V143 is available at Aetrix Electronics and suitable for notebook PCs, medical portable diagnostic devices, and industrial test equipment requiring stable component supply, long-lifecycle support, and TI-qualified gas gauge performance in Li-ion battery management systems.
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 leader specializing in analog, embedded processing, and power management technologies, with decades of expertise in battery management ICs and industrial-grade signal conditioning.
The BQ2084DBT-V143 belongs to TI's bq20xx gas gauge product line, engineered specifically for SBS v1.1-compliant smart battery systems in portable computing and instrumentation - emphasizing accuracy, flash-based adaptability, and seamless AFE co-design with the bq29312.
FAQ
What is the primary function of the BQ2084DBT-V143 in a battery system?
The BQ2084DBT-V143 serves as an SBS v1.1-compliant gas gauge IC that accurately measures and reports remaining battery capacity, voltage, temperature, and current using coulomb counting and integrated ADCs. It operates exclusively with the bq29312 AFE to manage protection, cell balancing, and host communication - the BQ2084DBT-V143 itself does not provide direct FET control or standalone protection.
Does the BQ2084DBT-V143 require an external crystal oscillator?
No - the BQ2084DBT-V143 integrates an internal oscillator that uses a 100-kΩ resistor on the ROSC pin (pin 33) for timing. A 32.768-kHz crystal may be used instead via XCK1/XCK2 pins, but both must not be installed simultaneously. The internal oscillator eliminates crystal BOM cost and layout sensitivity while meeting SBS timing requirements for SMBus and coulomb counting.
How does the BQ2084DBT-V143 achieve high-accuracy fuel gauging?
The BQ2084DBT-V143 achieves high accuracy through three key mechanisms: (1) a self-calibrating 16-bit integrating ADC on SR1/SR2 with <1-µV offset error, (2) programmable cell modeling stored in 1-kB flash to compensate for temperature, rate, and aging effects, and (3) voltage-based RM corrections at EDV0/EDV1/EDV2 thresholds. These features collectively deliver <1% capacity prediction error after qualified discharge learning cycles.
Can the BQ2084DBT-V143 operate without the bq29312 AFE?
No - the BQ2084DBT-V143 is architecturally dependent on the bq29312 AFE for analog front-end functions including cell voltage monitoring, protection FET drive, and level translation. Its VIN, SCLK, SDATA, and SAFE pins are designed for direct interconnection with the bq29312. Attempting standalone operation will result in missing voltage/temperature data and non-functional protection outputs.
What is the role of the RBI pin on the BQ2084DBT-V143?
The RBI (Register Backup Input) pin on the BQ2084DBT-V143 accepts a backup voltage source (e.g., storage capacitor or coin cell) to maintain RAM and register contents during main supply interruption or brownout. This ensures retained state - including learned FullChargeCapacity() and discharge history - across hot-swap events or temporary power loss, enabling consistent fuel-gauge operation without reinitialization.
BQ2084DBT-V143 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 38-TFSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- 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
BQ2084DBT-V143 FAQ
1.How can I place an order for BQ2084DBT-V143 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2084DBT-V143 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-V143 reliable?
The price and inventory of BQ2084DBT-V143 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2084DBT-V143 is usually 5 days.
3.What payment methods are accepted for BQ2084DBT-V143?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2084DBT-V143 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2084DBT-V143?
BQ2084DBT-V143 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2084DBT-V143 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-V143?
For technical support, including BQ2084DBT-V143 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2084DBT-V143 requirements.
6.How does Aetrix verify that BQ2084DBT-V143 is sourced from the original manufacturer or authorized distributors?
All BQ2084DBT-V143 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-V143 meets industry standards.
7.What is the process for return or replacement of BQ2084DBT-V143?
All BQ2084DBT-V143 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2084DBT-V143, 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-V143 part is unused and in its original packaging.
Return procedure for BQ2084DBT-V143:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2084DBT-V143 Tags
-
BQ29700DSER
Texas Instruments
-
S-8241ABKMC-GBKT2G
ABLIC Inc.
-
S-8241ABPMC-GBPT2G
ABLIC Inc.
-
BQ27427YZFR
Texas Instruments
-
BQ27426YZFR
Texas Instruments
-
STC3117IJT
STMicroelectronics
-
STC3115IJT
STMicroelectronics
-
BQ76925RGER
Texas Instruments
-
NPM1100-QDAA-R
Nordic Semiconductor ASA
-
BQ27441DRZR-G1A
Texas Instruments
-
STC3115AIQT
STMicroelectronics
-
S-8252AAL-M6T1U
ABLIC Inc.
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
