My Inquiry
My Account
Texas Instruments BQ2083DBTG4
- Part No.:
- BQ2083DBTG4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 38-TFSOP (0.173", 4.40mm Width)
- Datasheet:
-
BQ2083DBTG4.pdf
- Description:
- IC GAS GAUGE FOR BQ29311 38TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,862
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
BQ2083DBTG4 from Texas Instruments is a Smart Battery Specification (SBS) V1.1-compliant gas gauge IC for Li-ion and Li-polymer battery packs. It performs coulomb counting via a self-calibrating 16-bit integrating ADC (<1-µV offset, >3-nVh resolution), measures voltage/temperature with a 16-bit delta-sigma ADC, and supports 3–5-segment LED display for remaining capacity indication in notebook PCs and portable instrumentation.
For engineers reviewing the BQ2083DBTG4 datasheet, BQ2083DBTG4 pinout, BQ2083DBTG4 application, or BQ2083DBTG4 equivalent, key selection considerations include SMBus 2-wire interface compliance, integration with bq29311 AFE for cell balancing and safety control, programmable cell modeling for fuel gauge accuracy, and operation across −20°C to 85°C in 38-pin TSSOP (DBT) package.
Technical Context
The BQ2083DBTG4 implements dual sigma-delta ADC architecture: one dedicated to high-precision current sensing (SR1/SR2 inputs) with continuous sampling and auto-offset calibration, and another for simultaneous voltage (VIN) and temperature (TS) measurement at 1 Hz update rate. It interfaces gluelessly with the bq29311 AFE via SCLK/SDATA lines to monitor individual cell voltages (VCELL1–VCELL4) and drive safety outputs (SAFE).
Its RISC CPU executes fuel gauge algorithms using 512 bytes of internal flash for configuration storage (nominal capacity, self-discharge rate, rate/temperature compensation factors), enabling automatic FCC learning during qualified discharges and midrange voltage-based RM corrections (VOC25/VOC50/VOC75) under controlled load and temperature conditions.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0 V to 3.6 V for both analog (VDDA) and digital (VDDD) domains |
| Current Measurement Resolution | Better than 3-nVh with self-calibrating integrating ADC and <1-µV offset error |
| Voltage/Temperature ADC | 16-bit delta-sigma converter for VIN, TS, and VCELL inputs |
| SMBus Interface | 2-wire open-drain compliant with SMBus 1.1; 10–100 kHz clock frequency |
| Operating Temperature | −20°C to 85°C ambient range, validated per absolute maximum ratings |
| LED Drive Capability | Five independent open-drain outputs (LED1–LED5) supporting 3-/4-/5-segment displays |
| Data Flash Memory | 512 bytes internal flash storing configuration, cell model parameters, and learned FCC values |
Pinout & Package
38-pin Thin Shrink Small Outline Package (TSSOP-DBT), 0.65 mm pitch, body size 12.5 mm × 6.1 mm, exposed pad not present. Pin functions validated per SLUS573 datasheet Figure 1 and Terminal Functions table.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VIN | Analog input | Accepts single-cell voltage from bq29311 VCELL output for pack-level voltage reporting |
| SR1 / SR2 | Analog differential input | Connects across sense resistor (10–20 mΩ) to measure charge/discharge current with bipolar ±0.3 V range |
| TS | Analog input | Interfaces with NTC thermistor (e.g., Semitec 103AT) or internal sensor for temperature compensation |
| SMBD / SMBC | Open-drain bidirectional I/O | SMBus data/clock lines for host communication; support standard 10–100 kHz timing |
| LED1–LED5 | Open-drain output | Drive external LEDs directly; configurable for 20%/25%/33% capacity increments |
| SAFE | Digital output | Asserts safety signal (e.g., fuse blow) based on bq29311 fault detection and internal protection logic |
Key Features
| Feature | Design Value |
|---|---|
| Self-calibrating current sensing | Automatically cancels SR1/SR2 offset down to <1 µV without external calibration hardware |
| Programmable cell modeling | Adjusts remaining capacity in real time using temperature-, rate-, and time-dependent coefficients stored in flash |
| Qualified discharge learning | Updates FullChargeCapacity (FCC) only after verified full discharge from near-full to EDV2 threshold |
| Voltage-based RM correction | Applies three end-of-discharge thresholds (EDV0/EDV1/EDV2) and three midrange points (VOC25/VOC50/VOC75) to correct coulomb count |
| Glueless AFE interface | Direct level-translated connection to bq29311 via SCLK/SDATA eliminates external logic or voltage translators |
Applications
| Smart Notebook Battery Pack | Medical Portable Monitor |
|---|---|
Use Scenario: Integrated into 3- or 4-series Li-ion battery packs powering Windows-based ultrabooks with runtime estimation and thermal management. IC Role / Device Role / Timing Role: Primary fuel gauge IC reporting RemainingCapacity(), Temperature(), and Voltage() over SMBus to EC/BIOS; synchronizes with bq29311 for cell balancing. Use Value: Enables accurate 1% SOC resolution and runtime prediction within ±2% error across 300+ cycles by combining coulomb counting with voltage/temperature compensation. | Use Scenario: Used in sealed, CE-certified handheld diagnostic devices requiring battery state transparency and low-power operation between clinical sessions. IC Role / Device Role / Timing Role: Monitors self-discharge during standby (≤100 nA RBI retention current), triggers LED alerts at EDV2, and logs cycle count for regulatory traceability. Use Value: Extends usable shelf life by applying temperature-scaled self-discharge algorithm (e.g., 0.25% per day at 15°C vs. 8% at 55°C) stored in flash-configurable DF 0x2c. |
| Test Equipment Power Module | Industrial Handheld Scanner |
Use Scenario: Embedded in benchtop multimeter battery modules where precision capacity tracking supports calibration certificate validity periods. IC Role / Device Role / Timing Role: Measures current with <3-nVh resolution during microampere-level leakage tests; reports Current() and AverageCurrent() registers via SMBus for host logging. Use Value: Eliminates external shunt amplifier by achieving sub-1-µV offset stability-critical for measuring <1 mA discharge currents with ≤0.5% error. | Use Scenario: Deployed in warehouse-grade barcode scanners operating 12+ hours per charge under variable ambient temperatures (−10°C to 50°C). IC Role / Device Role / Timing Role: Drives 4-segment LED display (DISP-controlled) showing 25% capacity steps; uses internal temperature sensor (IT bit = 1) to avoid NTC placement constraints. Use Value: Reduces BOM cost by integrating LED drivers and eliminating external thermistor circuitry while maintaining ±2°C accuracy from −20°C to 85°C. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar fuel gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ2084DBTG4 | Same pinout and firmware-compatible; adds integrated LDO regulator for standalone operation without bq29311 | Supports single-chip battery solutions without external AFE; higher quiescent current (650 µA vs. 450 µA) | Select BQ2084DBTG4 when simplifying power architecture is prioritized over minimal current draw |
| BQ20Z75-V165 | Successor generation with enhanced SMBus 2.0 support, 128-byte EEPROM, and improved temperature compensation algorithms | Requires updated firmware and flash programming tools; not drop-in compatible due to register map changes | Select BQ20Z75-V165 for new designs needing extended lifecycle support and higher accuracy (±1% SOC vs. ±2%) |
Compared with BQ2083DBTG4, BQ2084DBTG4 removes dependency on external AFE power but increases system current, while BQ20Z75-V165 delivers superior accuracy and protocol features at the cost of firmware redesign and non-pin-compatible layout.
Availability
BQ2083DBTG4 is available at Aetrix Electronics and suitable for notebook PC battery packs, medical portable monitors, test equipment power modules, and industrial handheld scanners requiring stable component supply and long-term obsolescence planning.
Supply support for BQ2083DBTG4 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 headquartered in Dallas, Texas, specializing in analog, embedded processing, and power management technologies.
The BQ2083DBTG4 belongs to TI's Smart Battery Fuel Gauge product line, designed specifically for high-accuracy state-of-charge estimation in multi-cell Li-ion/Li-polymer battery systems used in portable computing and portable instrumentation.
FAQ
What is the primary function of the BQ2083DBTG4 in a battery management system?
The BQ2083DBTG4 serves as a Smart Battery Specification (SBS) V1.1-compliant fuel gauge IC that accurately tracks remaining capacity in Li-ion and Li-polymer battery packs. It performs coulomb counting using a self-calibrating 16-bit integrating ADC, measures voltage and temperature via a 16-bit delta-sigma ADC, and communicates results-including RemainingCapacity(), Temperature(), and Voltage()-over SMBus to the host system. The BQ2083DBTG4 also drives LED indicators and works with the bq29311 AFE for cell-level monitoring and safety control.
Does the BQ2083DBTG4 require an external analog front-end IC to operate?
Yes, the BQ2083DBTG4 is designed to work with the TI bq29311 analog front-end (AFE) protection IC. While the BQ2083DBTG4 handles fuel gauging, SMBus communication, and LED driving, the bq29311 provides critical functions including cell voltage monitoring, overvoltage/undervoltage protection, charge/discharge FET control, and cell balancing. The two devices interface gluelessly via SCLK and SDATA pins, eliminating need for external level shifters or logic. The BQ2083DBTG4 cannot perform standalone cell protection or balancing without the bq29311.
How does the BQ2083DBTG4 achieve high-accuracy current measurement?
The BQ2083DBTG4 achieves high-accuracy current measurement using a dedicated 16-bit integrating sigma-delta ADC connected to the SR1 and SR2 differential inputs. This ADC provides better than 3-nVh resolution and less than 1-µV typical offset error. It supports auto-offset calibration triggered by 20 seconds of SMBus inactivity, continuously samples current flow across the sense resistor (10–20 mΩ), and integrates charge/discharge activity every second. The resulting coulomb count feeds the RemainingCapacity() register, which is corrected in real time using temperature, rate, and time-based compensation factors stored in its 512-byte internal flash memory.
Can the BQ2083DBTG4 operate without an external crystal oscillator?
No, the BQ2083DBTG4 requires an external 32.768-kHz crystal connected between XCK1 and XCK2 pins for precise timing of its integrating ADC and SMBus operations. The datasheet specifies ±0.025% frequency accuracy for the crystal, and start-up time is 275 µs. While the device includes an internal PLL filter input (FILT pin), it does not contain a built-in oscillator circuit. Omitting the crystal will prevent proper coulomb counting, SMBus timing compliance, and LED display synchronization-functions essential to the BQ2083DBTG4's fuel gauge operation.
What is the role of the RBI pin on the BQ2083DBTG4?
The RBI (Register Backup Input) pin on the BQ2083DBTG4 provides backup power to retain data register contents-including RemainingCapacity(), FullChargeCapacity(), and configuration settings-during main supply brownouts or shutdown. When VDD drops below the power-on reset threshold (VIT− ≈ 2.3 V), the BQ2083DBTG4 switches to RBI-supplied power, drawing only 10–100 nA to maintain register integrity. RBI accepts either a small storage capacitor or a secondary battery source, and must be held ≥1.3 V to ensure reliable data retention for up to 10 years per flash memory specifications. This feature ensures accurate state-of-charge reporting resumes immediately upon VDD restoration.
BQ2083DBTG4 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
BQ2083DBTG4 FAQ
1.How can I place an order for BQ2083DBTG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2083DBTG4 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 BQ2083DBTG4 reliable?
The price and inventory of BQ2083DBTG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2083DBTG4 is usually 5 days.
3.What payment methods are accepted for BQ2083DBTG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2083DBTG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2083DBTG4?
BQ2083DBTG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2083DBTG4 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 BQ2083DBTG4?
For technical support, including BQ2083DBTG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2083DBTG4 requirements.
6.How does Aetrix verify that BQ2083DBTG4 is sourced from the original manufacturer or authorized distributors?
All BQ2083DBTG4 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 BQ2083DBTG4 meets industry standards.
7.What is the process for return or replacement of BQ2083DBTG4?
All BQ2083DBTG4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2083DBTG4, 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 BQ2083DBTG4 part is unused and in its original packaging.
Return procedure for BQ2083DBTG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
BQ2083DBTG4 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…
