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Texas Instruments BQ2083DBT
- Part No.:
- BQ2083DBT
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2083DBT.pdf
- Description:
- IC GAS GAUGE FOR BQ29311 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,732
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Product details
Overview
BQ2083DBT from Texas Instruments is a Smart Battery Specification (SBS) v1.1–compliant gas gauge IC for Li-ion and Li-polymer battery packs, featuring a 16-bit integrating ADC with <1-µV offset error, self-calibrating coulomb counting, and integrated 512-byte flash memory for programmable cell modeling. It operates with the bq29311 AFE to deliver complete pack electronics for 10.8-V or 14.4-V systems in notebook PCs and portable instrumentation.
For engineers reviewing the BQ2083DBT datasheet, BQ2083DBT pinout, BQ2083DBT application, or BQ2083DBT equivalent, this page delivers verified technical context, SMBus 2-wire interface timing, LED display driver capability, voltage/temperature measurement accuracy, and real-world fuel gauge calibration behavior - all specific to the BQ2083DBT TSSOP-38 package and its documented V1P2 revision.
Technical Context
The BQ2083DBT implements dual sigma-delta ADCs: one 16-bit integrating converter for current sensing (SR1/SR2) with <3-nVh resolution and <1-µV offset, and another for simultaneous voltage (VIN) and temperature (TS) measurement. It performs real-time coulomb counting, self-discharge compensation across −20°C to 85°C, and midrange voltage-based capacity correction at VOC25/VOC50/VOC75 thresholds.
It communicates via SMBus 2-wire protocol (10–100 kHz), supports SBS command set including RemainingCapacity(), FullChargeCapacity(), and Temperature(), and interfaces gluelessly with the bq29311 AFE for cell balancing, safety control, and power delivery - eliminating external regulators and reducing BOM count in smart battery designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V - powers analog (VDDA) and digital (VDDD) domains independently; enables stable operation across Li-ion pack voltage ranges. |
| Integrating ADC Resolution | <3-nVh - provides sub-microamp-level current integration fidelity for accurate long-term coulomb counting in portable devices. |
| Offset Error | <1 µV (typical) - ensures minimal zero-current drift in charge/discharge measurement, critical for low-load battery monitoring. |
| SMBus Frequency | 10–100 kHz - supports standard system management bus communication with host controllers without requiring custom timing logic. |
| Operating Temperature | −20°C to 85°C - validated for use in notebook PCs, medical equipment, and industrial portable instruments with thermal cycling. |
| Data Flash Memory | 512 bytes - stores nominal capacity, self-discharge rate, temperature compensation coefficients, and learned FCC values for field calibration. |
| LED Drive Capability | 5-segment push-pull outputs (LED1–LED5) - directly drives discrete LEDs for 20%/25%/33% remaining capacity indication without external drivers. |
Pinout & Package
38-pin Thin Shrink Small Outline Package (TSSOP-DBT), 0.65 mm pitch, exposed pad not specified, RoHS-compliant surface-mount footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Cell voltage input | Accepts scaled single-cell voltage from bq29311 for pack-level voltage reporting and EDV threshold detection. |
| SR1 / SR2 | Current sense differential inputs | Connects to 10–20 mΩ sense resistor; enables bipolar current measurement (±0.3 V range) for charge/discharge tracking. |
| TS | Thermistor voltage input | Supports external NTC (e.g., Semitec 103AT) or internal temperature sensor for self-discharge and capacity compensation. |
| SMBC / SMBD | SMBus clock/data | Open-drain bidirectional pins compliant with SMBus v2.0; enable host communication of RemainingCapacity(), Voltage(), and Current(). |
| LED1–LED5 | LED segment drivers | Push-pull outputs capable of sinking ≥10 mA each; support 3-/4-/5-segment visual fuel gauge without external transistors. |
| RBI | Register backup supply | Accepts capacitor or battery input (≥1.3 V) to retain data registers during main supply brownout or removal. |
| SAFE | Safety protection output | Drives external fuse or latch circuit for overvoltage/overcurrent shutdown when used with bq29311 AFE. |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating integrating ADC | Automatically cancels SR1/SR2 offset down to <1 µV during 20-s SMBus idle, eliminating manual calibration in production. |
| Programmable cell modeling | Uses flash-stored coefficients (DF 0x2a–0xad) to adapt capacity estimation to temperature, discharge rate, and aging - improving fuel gauge accuracy beyond fixed-table approaches. |
| Voltage-based capacity correction | Applies RM register adjustments at three EDV thresholds (EDV0/EDV1/EDV2) and three midrange points (VOC25/VOC50/VOC75) to correct drift from coulomb counting alone. |
| Qualified discharge learning | Updates FullChargeCapacity() only after verified full discharge (RM ≥ FCC − Near Full to EDV2) with no charge activity, enabling true battery capacity adaptation in end-user conditions. |
| Integrated SMBus slave interface | Directly responds to SBS commands (e.g., 0x0F RemainingCapacity, 0x10 FullChargeCapacity) without firmware translation - simplifies host-side battery management software. |
Applications
| Smart Notebook Battery Pack | Medical Portable Monitor |
|---|---|
|
Use Scenario: Integrated into 3- or 4-cell Li-ion battery packs powering clinical-grade portable monitors with 8+ hour runtime requirements. IC Role / Device Role / Timing Role: Primary fuel gauge IC performing real-time coulomb counting, temperature-compensated self-discharge modeling, and SMBus reporting of RemainingCapacity() and RunTimeToEmpty(). Use Value: Enables precise low-battery warnings and runtime prediction under variable load (ECG, SpO₂, display), meeting IEC 62304 Class C software safety requirements. |
Use Scenario: Used in battery-powered handheld diagnostic tools requiring FDA-cleared battery state-of-health tracking and recalibration during field service. IC Role / Device Role / Timing Role: Gas gauge core with flash-based cell modeling and qualified discharge learning to maintain ±3% capacity accuracy over 500 cycles and 2-year shelf life. Use Value: Supports regulatory documentation of battery performance decay and enables automated recalibration during device maintenance without host intervention. |
| Industrial Handheld Tester | Test Equipment Battery Module |
|
Use Scenario: Embedded in ruggedized handheld multimeters and insulation testers operating in −10°C to 60°C ambient environments. IC Role / Device Role / Timing Role: Measures charge flow via SR1/SR2, compensates for temperature-induced self-discharge using internal sensor, and drives 4-segment LED for %-remaining indication. Use Value: Delivers consistent runtime estimation despite wide temperature swings and intermittent high-current test pulses (e.g., 100 mA insulation test bursts). |
Use Scenario: Installed in benchtop oscilloscope or spectrum analyzer battery modules requiring hot-swap capability and precise capacity reporting to host firmware. IC Role / Device Role / Timing Role: SMBus slave providing standardized SBS v1.1 data (Voltage, Current, Temperature, CycleCount) while coordinating with bq29311 for cell balancing and overvoltage protection. Use Value: Enables seamless battery module replacement and host-side health analytics without proprietary communication protocols or calibration routines. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBT | Same pinout and firmware-compatible; adds enhanced self-discharge modeling and improved low-temperature accuracy below −10°C. | Preferred for medical devices requiring extended low-temp operation (−20°C to −10°C) and tighter SoC linearity at 5–15% remaining. | Select BQ2084DBT if design requires validated performance below −10°C or tighter EDV threshold consistency across aging. |
| BQ20Z75-V165 | Later-generation SBS gauge with integrated AFE, higher-resolution ADC (18-bit), and extended flash (2 KB); not pin-compatible. | Targets new designs needing higher accuracy, longer data retention (20 years), and embedded protection logic - requires PCB redesign. | Choose BQ20Z75-V165 for next-gen products where layout revision is acceptable and >±1% fuel gauge accuracy is mandatory. |
Compared with BQ2083DBT, BQ2084DBT offers incremental low-temperature improvements in the same footprint, while BQ20Z75-V165 delivers architectural upgrades at the cost of compatibility - making BQ2083DBT optimal for cost-sensitive, volume-manufactured smart battery packs with established validation.
Availability
BQ2083DBT is available at Aetrix Electronics and suitable for notebook PC battery packs, portable medical monitors, industrial handheld testers, and test equipment battery modules requiring stable component supply and long-lifecycle support.
Supply support for BQ2083DBT 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 specializing in analog, embedded processing, and power management technologies, with leadership in battery management ICs since the 1990s.
The BQ2083DBT belongs to TI's Smart Battery Fuel Gauge product line, designed specifically for SBS v1.1–compliant Li-ion/Li-polymer battery packs in portable computing and portable instrumentation where accuracy, low power, and SMBus interoperability are essential.
FAQ
What is the primary function of the BQ2083DBT in a battery management system?
The BQ2083DBT serves as a Smart Battery Specification v1.1–compliant fuel gauge IC that accurately tracks remaining battery capacity using coulomb counting, temperature-compensated self-discharge modeling, and voltage-based corrections. It reports RemainingCapacity(), FullChargeCapacity(), and other SBS parameters via SMBus to the host system, enabling precise runtime prediction and state-of-charge indication in the BQ2083DBT-based battery pack.
Does the BQ2083DBT require an external microcontroller to operate?
No, the BQ2083DBT contains an integrated low-power RISC CPU core and 512 bytes of flash memory, allowing it to execute fuel gauge algorithms autonomously. It does not require an external MCU for basic operation - the host system only needs to read SMBus registers (e.g., 0x0F RemainingCapacity) to obtain battery status. The BQ2083DBT handles all real-time coulomb integration, self-calibration, and capacity learning internally.
How does the BQ2083DBT achieve high-accuracy current measurement?
The BQ2083DBT uses a dedicated 16-bit integrating sigma-delta ADC with <1-µV offset error and <3-nVh resolution on SR1/SR2 pins. It performs continuous sampling and auto-calibration during SMBus idle periods, enabling sub-microamp current integration fidelity. This architecture minimizes drift and noise accumulation - critical for accurate long-term capacity tracking in the BQ2083DBT's intended applications.
Can the BQ2083DBT drive LEDs directly without external components?
Yes, the BQ2083DBT integrates five push-pull LED drivers (LED1–LED5) capable of sinking ≥10 mA per segment. It supports 3-, 4-, or 5-segment displays for remaining capacity indication at 20%, 25%, or 33% increments - eliminating the need for external transistors or current-limiting resistors in most implementations of the BQ2083DBT-based design.
What is the role of the RBI pin on the BQ2083DBT?
The RBI (Register Backup Input) pin on the BQ2083DBT accepts a backup voltage source (≥1.3 V) - typically from a small capacitor or coin cell - to retain critical data registers (e.g., RemainingCapacity, FullChargeCapacity) during main supply removal or brownout. This ensures nonvolatile state preservation without relying on external EEPROM, a key reliability feature of the BQ2083DBT in mission-critical portable systems.
BQ2083DBT 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:
- -
- Fault Protection:
- -
- Interface:
- SMBus
- Operating Temperature:
- -20°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 38-TSSOP
BQ2083DBT FAQ
1.How can I place an order for BQ2083DBT through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2083DBT 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 BQ2083DBT reliable?
The price and inventory of BQ2083DBT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2083DBT is usually 5 days.
3.What payment methods are accepted for BQ2083DBT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2083DBT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2083DBT?
BQ2083DBT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2083DBT 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 BQ2083DBT?
For technical support, including BQ2083DBT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2083DBT requirements.
6.How does Aetrix verify that BQ2083DBT is sourced from the original manufacturer or authorized distributors?
All BQ2083DBT 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 BQ2083DBT meets industry standards.
7.What is the process for return or replacement of BQ2083DBT?
All BQ2083DBT units undergo pre-shipment inspection (PSI). If there is an issue with BQ2083DBT, 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 BQ2083DBT part is unused and in its original packaging.
Return procedure for BQ2083DBT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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