SLUSC67B March 2016  – October 2017

PRODUCTION DATA. 

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Pin Configuration and Functions
  6. Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 ESD Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics: Supply Current
    6. 6.6 Electrical Characteristics: Power Supply Control
    7. 6.7 Electrical Characteristics: AFE Power-On Reset
    8. 6.8 Electrical Characteristics: AFE Watchdog Reset and Wake Timer
    9. 6.9 Electrical Characteristics: Current Wake Comparator
    10. 6.10Electrical Characteristics: VC1, VC2, VC3, VC4, BAT, PACK
    11. 6.11Electrical Characteristics: SMBD, SMBC
    12. 6.12Electrical Characteristics: PRES, BTP_INT, DISP
    13. 6.13Electrical Characteristics: LEDCNTLA, LEDCNTLB, LEDCNTLC
    14. 6.14Electrical Characteristics: Coulomb Counter
    15. 6.15Electrical Characteristics: CC Digital Filter
    16. 6.16Electrical Characteristics: ADC
    17. 6.17Electrical Characteristics: ADC Digital Filter
    18. 6.18Electrical Characteristics: CHG, DSG FET Drive
    19. 6.19Electrical Characteristics: PCHG FET Drive
    20. 6.20Electrical Characteristics: FUSE Drive
    21. 6.21Electrical Characteristics: Internal Temperature Sensor
    22. 6.22Electrical Characteristics: TS1, TS2, TS3, TS4
    23. 6.23Electrical Characteristics: PTC, PTCEN
    24. 6.24Electrical Characteristics: Internal 1.8-V LDO
    25. 6.25Electrical Characteristics: High-Frequency Oscillator
    26. 6.26Electrical Characteristics: Low-Frequency Oscillator
    27. 6.27Electrical Characteristics: Voltage Reference 1
    28. 6.28Electrical Characteristics: Voltage Reference 2
    29. 6.29Electrical Characteristics: Instruction Flash
    30. 6.30Electrical Characteristics: Data Flash
    31. 6.31Electrical Characteristics: OCD, SCC, SCD1, SCD2 Current Protection Thresholds
    32. 6.32Timing Requirements: OCD, SCC, SCD1, SCD2 Current Protection Timing
    33. 6.33Timing Requirements: SMBus
    34. 6.34Timing Requirements: SMBus XL
    35. 6.35Typical Characteristics
  7. Detailed Description
    1. 7.1Overview
    2. 7.2Functional Block Diagram
    3. 7.3Feature Description
      1. 7.3.1 Primary (1st Level) Safety Features
      2. 7.3.2 Secondary (2nd Level) Safety Features
      3. 7.3.3 Charge Control Features
      4. 7.3.4 Gas Gauging
      5. 7.3.5 Configuration
        1. 7.3.5.1Oscillator Function
        2. 7.3.5.2System Present Operation
        3. 7.3.5.3Emergency Shutdown
        4. 7.3.5.41-Series, 2-Series, 3-Series, or 4-Series Cell Configuration
        5. 7.3.5.5Cell Balancing
      6. 7.3.6 Battery Parameter Measurements
        1. 7.3.6.1Charge and Discharge Counting
      7. 7.3.7 Battery Trip Point (BTP)
      8. 7.3.8 Lifetime Data Logging Features
      9. 7.3.9 Authentication
      10. 7.3.10LED Display
      11. 7.3.11Voltage
      12. 7.3.12Current
      13. 7.3.13Temperature
      14. 7.3.14Communications
        1. 7.3.14.1SMBus On and Off State
        2. 7.3.14.2SBS Commands
    4. 7.4Device Functional Modes
  8. Applications and Implementation
    1. 8.1Application Information
    2. 8.2Typical Applications
      1. 8.2.1Design Requirements
      2. 8.2.2Detailed Design Procedure
        1. 8.2.2.1High-Current Path
          1. 8.2.2.1.1Protection FETs
          2. 8.2.2.1.2Chemical Fuse
          3. 8.2.2.1.3Lithium-Ion Cell Connections
          4. 8.2.2.1.4Sense Resistor
          5. 8.2.2.1.5ESD Mitigation
        2. 8.2.2.2Gas Gauge Circuit
          1. 8.2.2.2.1Coulomb-Counting Interface
          2. 8.2.2.2.2Power Supply Decoupling and PBI
          3. 8.2.2.2.3System Present
          4. 8.2.2.2.4SMBus Communication
          5. 8.2.2.2.5FUSE Circuitry
        3. 8.2.2.3Secondary-Current Protection
          1. 8.2.2.3.1Cell and Battery Inputs
          2. 8.2.2.3.2External Cell Balancing
          3. 8.2.2.3.3PACK and FET Control
          4. 8.2.2.3.4Temperature Output
          5. 8.2.2.3.5LEDs
          6. 8.2.2.3.6Safety PTC Thermistor
      3. 8.2.3Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1Layout Guidelines
      1. 10.1.1Protector FET Bypass and Pack Terminal Bypass Capacitors
      2. 10.1.2ESD Spark Gap
    2. 10.2Layout Example
  11. 11Device and Documentation Support
    1. 11.1Documentation Support
      1. 11.1.1Related Documentation
    2. 11.2Community Resources
    3. 11.3Trademarks
    4. 11.4Electrostatic Discharge Caution
    5. 11.5Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Features

  • High-Side Protection N-CH FET Drive Enables Serial Bus Communication During Fault Conditions
  • Cell Balancing with Internal Bypass Optimizes Battery Health
  • Diagnostic Lifetime Data Monitor and Black Box Recorder for Failure Analysis
  • Full Array of Programmable Protection Features: Voltage, Current, Temperature
  • JEITA Charge Algorithms Support Smart Charging
  • Analog Front End with Two Independent ADCs
    • Simultaneous Current and Voltage Sampling
    • High-Accuracy Coulomb Counter with Input Offset Error < 1 μV (Typical)
  • Supports Battery Trip Point (BTP) Function for Windows® Integration
  • LED Display for State of Charge and Battery Status Indication
  • 100-KHz SMBus v1.1 Communications Interface for Programming and Data Access with Alternate 400-KHz Mode
  • SHA-1 Authentication Responder for Increased Battery Pack Security
  • Compact 32-Pin VQFN Package (RSM)

Applications

  • Notebooks
  • Medical and Test Equipment
  • Portable Instrumentation
  • Cordless Vacuum Cleaners and Vacuum Robots

Description

The Texas Instruments bq4050 device, incorporating Compensated End-of-Discharge Voltage (CEDV) technology, is a highly integrated, accurate, 1-series to 4-series cell gas gauge and protection solution, enabling autonomous charger control and cell balancing.

The bq4050 device provides a fully integrated pack-based solution with a flash programmable custom reduced instruction-set CPU (RISC), safety protection, and authentication for Li-Ion and Li-Polymer battery packs.

The bq4050 gas gauge communicates via an SMBus-compatible interface and combines an ultra-low power, high-speed TI bqBMP processor, high-accuracy analog measurement capabilities, integrated flash memory, an array of peripheral and communication ports, an N-CH FET drive, and a SHA-1 Authentication transform responder into a complete, high-performance battery management solution.

Device Information(1)

PART NUMBERPACKAGEBODY SIZE (NOM)
bq4050VQFN (32) 4.00 mm × 4.00 mm
  1. For all available packages, see the orderable addendum at the end of this data sheet.

Simplified Schematic

bq4050 Simp_Schematic.gif