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Texas Instruments BQ2092SN-A311G4
- Part No.:
- BQ2092SN-A311G4
- Manufacturer:
- Texas Instruments
- Category:
- Battery Management
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
BQ2092SN-A311G4.pdf
- Description:
- IC GAS GAUGE LITH-ION 16-SOIC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
BQ2092SN-A311G4 from Texas Instruments is a gas gauge IC for NiCd, NiMH, and Li-Ion battery packs, providing real-time state-of-charge, remaining capacity (mAh), run-time-to-empty (minutes), and battery voltage via SMBus-like two-wire interface. It integrates an internal temperature sensor, programmable self-discharge compensation, and four-segment LED display control. Designed for embedded battery-pack integration, it operates from 3.0–5.5 V with 120 µA typical quiescent current.
For engineers reviewing the BQ2092SN-A311G4 datasheet, BQ2092SN-A311G4 pinout, BQ2092SN-A311G4 application, or BQ2092SN-A311G4 equivalent, key selection considerations include its support for SBData charge control commands, EEPROM-based calibration for chemistry-specific parameters, temperature-compensated current integration, and direct LED segment drive capability without external drivers.
Technical Context
The BQ2092SN-A311G4 implements coulomb counting using a precision sense-resistor input (SR–VSS) with ±50 µV typical offset voltage and integrated digital filtering to reject sub-threshold current transients. Its internal temperature sensor enables real-time compensation of charge/discharge efficiency and self-discharge rate-programmable from 0–25% per day at 25°C, doubling per +10°C rise.
It communicates via open-drain SCC/SCD pins using SMBus-compatible read word/write word protocols, supporting Smart Battery Data (SBData) registers including RemainingCapacity (0x0F), FullChargeCapacity (0x10), Temperature (0x08), Voltage (0x09), and BatteryStatus (0x16). Charge control is implemented by broadcasting ChargingCurrent() and ChargingVoltage() to Smart Charger address, with safety termination triggered at >256 mAh over FCC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 3.0–5.5 V - supports direct operation from 3-cell Ni-based packs; REF output enables low-cost microregulator for other configurations. |
| Operating Current | 120 µA typical - enables long-term monitoring in always-on battery packs without significant self-load. |
| Current Sensing Offset | ±50 µV typical - ensures accurate coulomb counting down to ~1 mA with standard 10 mΩ sense resistors. |
| Digital Filter Threshold | Programmable |VSRD| from ±0.23 mV to ±0.60 mV - suppresses noise-induced false charge/discharge counts below user-defined current levels. |
| Temperature Compensation | Internal sensor with 0.1°K resolution - adapts self-discharge estimation and RM register updates across –20°C to +70°C operating range. |
| LED Drive Capability | SEG1–SEG4 sink outputs - directly drives four LEDs in 25% increments for full-to-empty graphical display; DISP pin enables timed or charge-triggered activation. |
| EEPROM Interface | SCL/SDA pins - serial memory interface for external configuration EEPROM storing DesignCapacity, EDV thresholds, charge rates, and chemistry data. |
Pinout & Package
16-pin narrow SOIC (SOIC-16N) package, 3.9 mm × 9.9 mm body, 1.27 mm pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VCC | Power supply input | 3.0–5.5 V main supply; powers all internal circuitry and sources current for SEG1–SEG4 LED segments. |
| VSS | System ground | Reference node for SR, SCD, SCC, and analog sensing; requires single-point ground layout to minimize VOS error. |
| SR | Sense resistor input | Differential input measuring voltage drop across external sense resistor; integrated current accumulator with temperature-compensated offset correction. |
| SB | Battery sense input | High-impedance input monitoring pack voltage via resistor divider; used for EDV1/EDVF detection and charging voltage validation. |
| SCC / SCD | SMBus-like serial interface | Open-drain bidirectional clock/data lines compliant with SMBus timing; support read word/write word/block read protocols per Table 4. |
| SEG1–SEG4 | LED segment outputs | Active-low sink drivers for four-segment graphical battery level display; modulated at ~100 Hz with 30% duty cycle per segment bank. |
| DISP | Display control input | Logic input enabling LED display: high = disabled; floating = active during ≥100 mA charge; low = forced 4-second activation. |
| REF | Voltage reference output | Stable reference for external n-FET regulator; enables cost-effective VCC generation for non-3-cell configurations. |
| VOUT | EEPROM supply output | Provides regulated power to external configuration EEPROM; eliminates need for separate EEPROM supply rail. |
Key Features
| Feature | Design Value |
|---|---|
| Integrated temperature sensor | Eliminates external thermistor, reducing BOM count and PCB area while enabling real-time thermal compensation of capacity and self-discharge. |
| Self-discharge rate programming | User-configurable via EEPROM (0–25%/day at 25°C), with automatic doubling/halving per ±10°C deviation - matches actual battery aging behavior. |
| Two-mode LED display | Supports absolute mode (25% of DesignCapacity) or relative mode (25% of FullChargeCapacity), adapting display accuracy as battery wears. |
| Smart Battery Data compliance | Full support for SBData registers including RemainingCapacity, RunTimeToEmpty, BatteryStatus, and ChargingVoltage - interoperable with industry-standard smart battery systems. |
| Charge control broadcast | Automatically transmits ChargingCurrent() and ChargingVoltage() to Smart Charger address, enabling closed-loop charge management for NiMH/Li-Ion chemistries. |
| Digital magnitude filter | Configurable threshold (DMF register) rejects sub-threshold current noise, preventing erroneous capacity drift during standby or light-load conditions. |
Applications
| Portable Medical Devices | Industrial Handheld Scanners |
|---|---|
|
Use Scenario: Rechargeable battery-powered glucose meters and infusion pumps requiring precise remaining runtime estimation under variable load and temperature. IC Role / Device Role / Timing Role: Gas gauge IC performing real-time coulomb counting, temperature-compensated self-discharge modeling, and SMBus reporting of RemainingCapacity and RunTimeToEmpty. Use Value: Enables accurate low-battery warnings and prevents unexpected shutdown during critical procedures by tracking capacity degradation across charge cycles. |
Use Scenario: Ruggedized barcode scanners used in warehouse logistics with frequent intermittent discharge and ambient temperature swings from 0°C to 45°C. IC Role / Device Role / Timing Role: Battery fuel gauge managing state-of-charge for NiMH packs, using internal temperature sensor and programmable EDV thresholds to adapt end-of-discharge detection. Use Value: Extends usable runtime per charge by 8–12% compared to fixed-voltage cutoff, leveraging temperature-aware discharge profiling. |
| Smart Power Tools | Emergency Lighting Systems |
|
Use Scenario: Cordless drills and impact drivers with high-pulse discharge profiles (up to 6 A) and rapid thermal cycling during continuous use. IC Role / Device Role / Timing Role: Coulomb counter with dynamic digital filtering (disabling EDV monitoring above 6 A) and ΔT/Δt-based charge termination for NiMH packs. Use Value: Prevents premature capacity reporting during high-current bursts and ensures safe full-charge detection using temperature rise rate instead of voltage alone. |
Use Scenario: UL 924-compliant emergency exit lights with sealed NiCd battery packs requiring maintenance-free operation over 5+ years. IC Role / Device Role / Timing Role: Standby gas gauge monitoring self-discharge, executing periodic capacity recalibration, and reporting battery health via SMBus to building management system. Use Value: Reduces manual inspection frequency by 70% through automated capacity trend analysis and early degradation alerts before failure threshold. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar gas gauge applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| BQ20Z75-V165 | Higher-precision 16-bit ADC, integrated 256-byte EEPROM, supports Li-Ion only; no LED drivers or NiMH/NiCd support. | Targeted at premium Li-Ion laptop/smartphone packs requiring <1% SOC error; lacks multi-chemistry flexibility and LED display. | Select BQ20Z75-V165 only when Li-Ion-only operation, higher accuracy, and embedded EEPROM are required - not suitable for Ni-based chemistries or cost-sensitive LED-display designs. |
| MAX17043 | ModelGauge™ m3 algorithm, no SMBus interface (I²C only), no LED outputs, lower quiescent current (22 µA), no SBData command support. | Optimized for ultra-low-power IoT sensors and wearables; lacks Smart Battery ecosystem compatibility and hardware display control. | Choose MAX17043 for battery-constrained IoT nodes where SMBus interoperability and LED feedback are unnecessary - BQ2092SN-A311G4 remains preferred for industrial smart battery packs. |
Compared with BQ20Z75-V165 and MAX17043, the BQ2092SN-A311G4 uniquely balances multi-chemistry support (NiCd/NiMH/Li-Ion), SMBus/SBData compliance, integrated LED drive, and cost-effective external EEPROM architecture - making it the only option among the three qualified for legacy smart battery systems requiring backward-compatible charge control and visual status indication.
Availability
BQ2092SN-A311G4 is available at Aetrix Electronics and suitable for portable medical devices, industrial handheld scanners, smart power tools, and emergency lighting systems requiring stable component supply and long-lifecycle support.
Supply support for BQ2092SN-A311G4 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 and embedded processing technologies, with leadership in battery management, power conversion, and signal chain solutions.
The BQ2092SN-A311G4 belongs to TI's Smart Battery Fuel Gauge product line, designed specifically for cost-sensitive, multi-chemistry battery packs requiring SMBus interoperability, LED status indication, and field-programmable calibration without embedded memory.
FAQ
What battery chemistries does the BQ2092SN-A311G4 support?
The BQ2092SN-A311G4 supports NiCd, NiMH, and Li-Ion rechargeable battery chemistries. It implements chemistry-specific charge control algorithms, self-discharge models, and voltage threshold settings - all programmable via external EEPROM. The BQ2092SN-A311G4 does not support lead-acid or LiFePO₄ chemistries, and its SBData command set is validated only for the three supported types.
Does the BQ2092SN-A311G4 require an external EEPROM to operate?
Yes, the BQ2092SN-A311G4 requires an external EEPROM connected via SCL/SDA pins for proper operation. Critical parameters-including DesignCapacity, EDV thresholds, charging voltage/current, self-discharge rate, and battery chemistry-are stored exclusively in this EEPROM. Without it, the BQ2092SN-A311G4 defaults to invalid values and cannot report accurate state-of-charge or initiate charge control.
How does the BQ2092SN-A311G4 handle high-current discharge events?
The BQ2092SN-A311G4 disables end-of-discharge voltage (EDV) monitoring when discharge current exceeds approximately 6 A to prevent false low-battery triggers during pulse loads. EDV monitoring resumes automatically once current falls below that threshold. The core coulomb counting via SR–VSS remains fully active, ensuring uninterrupted capacity tracking even during high-current transients.
Can the BQ2092SN-A311G4 drive LEDs directly without external transistors?
Yes, the BQ2092SN-A311G4 features four dedicated LED sink outputs (SEG1–SEG4) capable of directly driving standard 20 mA LEDs without external transistors. Each segment sinks current sourced from VCC, and the outputs are internally modulated at ~100 Hz. The DISP pin provides flexible activation control - floating for charge-triggered display, low for timed 4-second activation, or high to disable entirely.
What is the role of the REF pin on the BQ2092SN-A311G4?
The REF pin on the BQ2092SN-A311G4 provides a stable voltage reference output used to build a simple, low-cost microregulator with an external n-channel FET and resistor. This allows the BQ2092SN-A311G4 to operate from non-standard battery configurations (e.g., 1–4 Li-Ion cells) by generating a regulated VCC rail - eliminating the need for a separate DC/DC converter in space-constrained battery packs.
BQ2092SN-A311G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Battery Monitor
- Battery Chemistry:
- Multi-Chemistry
- Number of Cells:
- -
- Fault Protection:
- -
- Interface:
- I2C
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
BQ2092SN-A311G4 FAQ
1.How can I place an order for BQ2092SN-A311G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for BQ2092SN-A311G4 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 BQ2092SN-A311G4 reliable?
The price and inventory of BQ2092SN-A311G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for BQ2092SN-A311G4 is usually 5 days.
3.What payment methods are accepted for BQ2092SN-A311G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for BQ2092SN-A311G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for BQ2092SN-A311G4?
BQ2092SN-A311G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your BQ2092SN-A311G4 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 BQ2092SN-A311G4?
For technical support, including BQ2092SN-A311G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your BQ2092SN-A311G4 requirements.
6.How does Aetrix verify that BQ2092SN-A311G4 is sourced from the original manufacturer or authorized distributors?
All BQ2092SN-A311G4 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 BQ2092SN-A311G4 meets industry standards.
7.What is the process for return or replacement of BQ2092SN-A311G4?
All BQ2092SN-A311G4 units undergo pre-shipment inspection (PSI). If there is an issue with BQ2092SN-A311G4, 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 BQ2092SN-A311G4 part is unused and in its original packaging.
Return procedure for BQ2092SN-A311G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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