SLUSBU9H March   2014  – June 2021 BQ2970 , BQ2971 , BQ2972 , BQ2973

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1. 6.1 Pin Descriptions
      1. 6.1.1 Supply Input: BAT
      2. 6.1.2 Cell Negative Connection: VSS
      3. 6.1.3 Voltage Sense Node: V–
      4. 6.1.4 Discharge FET Gate Drive Output: DOUT
      5. 6.1.5 Charge FET Gate Drive Output: COUT
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 DC Characteristics
    6. 7.6 Programmable Fault Detection Thresholds
    7. 7.7 Programmable Fault Detection Timer Ranges
    8. 7.8 Typical Characteristics
  8. 8 Parameter Measurement Information
    1. 8.1 Timing Charts
    2. 8.2 Test Circuits
    3. 8.3 Test Circuit Diagrams
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
    4. 9.4 Device Functional Modes
      1. 9.4.1 Normal Operation
      2. 9.4.2 Overcharge Status
      3. 9.4.3 Over-Discharge Status
      4. 9.4.4 Discharge Overcurrent Status (Discharge Overcurrent, Load Short-Circuit)
      5. 9.4.5 Charge Overcurrent Status
      6. 9.4.6 0-V Charging Function Enabled
      7. 9.4.7 0-V Charging Inhibit Function
      8. 9.4.8 Delay Circuit
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
      3. 10.2.3 Application Performance Plots
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Related Documentation
    2. 13.2 Support Resources
    3. 13.3 Trademarks
    4. 13.4 Electrostatic Discharge Caution
    5. 13.5 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

10.2.1 Design Requirements

For this design example, use the parameters listed in Table 10-1.

Table 10-1 Design Parameters
DESIGN PARAMETEREXAMPLE VALUE at TA = 25°C
Input voltage range4.5 V to 7 V
Maximum operating discharge current7 A
Maximum Charge Current for battery pack4.5 A
Overvoltage Protection (OVP)4.275 V
Overvoltage detection delay timer1.2 s
Overvoltage Protection (OVP) release voltage4.175 V
Undervoltage Protection (UVP)2.8 V
Undervoltage detection delay timer150 ms
Undervoltage Protection (UVP) release voltage2.9 V
Charge Overcurrent detection (OCC) voltage–70 mV
Charge Overcurrent Detection (OCC) delay timer9 ms
Discharge Overcurrent Detection (OCD) voltage100 mV
Discharge Overcurrent Detection (OCD) delay timer18 ms
Load Short Circuit Detection SCC) voltage, BAT to –V ≤ threshold500 mV
Load Short Circuit Detection (SCC) delay timer250 µs
Load Short Circuit release voltage, BAT to –V ≥ Threshold1 V