SLUSB48 July   2014

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Simplified Schematic
  5. 5 Revision History
  6. 6 Description (continued)
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1  Absolute Maximum Ratings
    2. 8.2  Handling Ratings
    3. 8.3  Recommended Operating Conditions
    4. 8.4  Thermal Information
    5. 8.5  Electrical Characteristics: Supply Current
    6. 8.6  Electrical Characteristics: I/O
    7. 8.7  Electrical Characteristics: ADC
    8. 8.8  Electrical Characteristics: Power-On Reset
    9. 8.9  Electrical Characteristics: Oscillator
    10. 8.10 Electrical Characteristics: Data Flash Memory
    11. 8.11 Electrical Characteristics: Register Backup
    12. 8.12 SMBus Timing Specifications
    13. 8.13 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1 Primary (1st Level) Safety Features
      2. 9.3.2 Secondary (2nd Level) Safety Features
      3. 9.3.3 Charge Control Features
      4. 9.3.4 Fuel Gauging
      5. 9.3.5 Lifetime Data Logging
      6. 9.3.6 Authentication
      7. 9.3.7 Battery Parameter Measurements
        1. 9.3.7.1 Current and Coulomb Counting
        2. 9.3.7.2 Voltage
        3. 9.3.7.3 Temperature
    4. 9.4 Device Functional Modes
    5. 9.5 Programming
      1. 9.5.1 Physical Interface
      2. 9.5.2 SMBus Address
      3. 9.5.3 SMBus On and Off State
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Applications
      1. 10.2.1 Schematic
      2. 10.2.2 Design Requirements
      3. 10.2.3 Detailed Design Procedure
        1. 10.2.3.1 Measurement System
          1. 10.2.3.1.1 Cell Voltages
          2. 10.2.3.1.2 External Average Cell Voltage
          3. 10.2.3.1.3 Current
          4. 10.2.3.1.4 Temperature
        2. 10.2.3.2 Gas Gauging
        3. 10.2.3.3 Charging
          1. 10.2.3.3.1 Fast Charging Voltage
          2. 10.2.3.3.2 Fast Charging Current
          3. 10.2.3.3.3 Other Charging Modes
        4. 10.2.3.4 Protection
        5. 10.2.3.5 Peripheral Features
          1. 10.2.3.5.1 LED Display
          2. 10.2.3.5.2 SMBus Address
      4. 10.2.4 Application Performance Plots
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Power Supply Decoupling Capacitor
      2. 12.1.2 MRST Connection
      3. 12.1.3 Communication Line Protection Components
      4. 12.1.4 ESD Spark Gap
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Related Documentation
    2. 13.2 Trademarks
    3. 13.3 Electrostatic Discharge Caution
    4. 13.4 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

1 Features

  • Compensated End-of-Discharge Voltage (CEDV) Gauging Algorithm
  • Supports SMBus Host Communication
  • Flexible Configuration for 3- to 5-Series (bq76920), 6- to 10-Series (bq76930), and 9- to 15-Series (bq76940) Li-Ion and LiFePO4 Batteries
  • Supports Battery Configurations up to 320 Ahr
  • Supports Charge and Discharge Current Reporting up to 320 A
  • External NTC Thermistor Support from Companion AFE
  • Full Array of Programmable Protection Features
    • Voltage
    • Current
    • Temperature
    • System Components
  • Lifetime Data Logging
  • Supports CC-CV Charging, Including Precharge, Charge Inhibit, and Charge Suspend
  • Offers an Optional Resistor Programmable SMBus Slave Address for up to Eight Different Bus Addresses
  • Drives up to a 5-Segment LED or LCD Display for State-Of-Charge Indication
  • Provides SHA-1 Authentication

2 Applications

  • Light Electric Vehicles (LEVs): eBikes, eScooters, Pedelec, and Pedal-Assist Bicycles
  • Power and Gardening Tools
  • Battery Backup and Uninterruptible Power Supply (UPS) Systems
  • Wireless Base Station Backup Systems
  • Telecom Power Systems

3 Description

The Texas Instruments bq78350 Li-Ion and LiFePO4 Battery Management Controller and companion to the bq769x0 family of Analog Front End (AFE) protection devices provides a comprehensive set of Battery Management System (BMS) subsystems, helping to accelerate product development for faster time-to-market.

Device Information(1)

PART NUMBER PACKAGE BODY SIZE (NOM)
bq78350 TSSOP (30) 7.80 mm x 6.40 mm
  1. For all available packages, see the orderable addendum at the end of the datasheet.

4 Simplified Schematic

SimpSchematic.gif