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

9.4.6 0-V Charging Function Enabled

This feature enables recharging a connected battery that has very low voltage due to self-discharge. When the charger applies a voltage greater than or equal to V0CHG to Pack+ and Pack– connections, the COUT pin gate drive is fixed by the BAT pin voltage.

Once the voltage between the gate and the source of the charging FET becomes equal to or greater than the turn ON voltage due to the charger voltage, the charging FET is ON and the battery is charged with current flow through the charging FET and the internal parasitic diode of the discharging FET. Once the battery voltage is equal to or higher than the over-discharge release voltage, the device enters normal status.

CAUTION:
  1. Some battery providers do not recommend charging a depleted (self-discharged) battery. Consult the battery supplier to determine whether to have the 0-V battery charger function.
  2. The 0-V battery charge feature has a higher priority than the charge overcurrent detection function. In this case, the 0-V charging will be allowed and the battery charges forcibly, which results in charge overcurrent detection being disabled if the battery voltage is lower than the over-discharge detection voltage.