JAJSV55 August   2024 BQ2969

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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
    6. 6.6 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Pin Details
        1. 7.3.1.1 Input Sense Voltage, Vx
        2. 7.3.1.2 Output Drive, OUT
        3. 7.3.1.3 Supply Input, VDD
        4. 7.3.1.4 Regulated Supply Output, REG
      2. 7.3.2 Overvoltage Sensing for OUT
      3. 7.3.3 Regulator Output Voltage
    4. 7.4 Device Functional Modes
      1. 7.4.1 NORMAL Mode
      2. 7.4.2 OVERVOLTAGE Mode
      3. 7.4.3 UNDERVOLTAGE Mode
      4. 7.4.4 CUSTOMER TEST MODE
  9. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
      3. 8.2.3 Application Curves
  10. 9 Power Supply Recommendations
  11. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  12. 11Device and Documentation Support
    1. 11.1 サード・パーティ製品に関する免責事項
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 サポート・リソース
    4. 11.4 Trademarks
    5. 11.5 静電気放電に関する注意事項
    6. 11.6 用語集
  13. 12Revision History
  14. 13Mechanical, Packaging, and Orderable Information

7.4.3 UNDERVOLTAGE Mode

The UNDERVOLTAGE mode is detected if any of the cell voltage across (V1–VSS), (V2–V1), (V3–V2), or (V4–V3) is below the VUVREG threshold for tUVDELAY time. In this mode, the regulated output is disabled. To return to NORMAL mode, all the cell voltages must be above (VUVREG + VUVHYS) and below VOV.

If the device is used in a system with fewer than 4 cells, Vn pin can be shorted to the (Vn – 1) pin. The device ignores any differential cell voltage below the VUVQUAL threshold for undervoltage detection.

Even when in the UNDERVOLTAGE mode, the device continues to regularly monitor each cell voltage, checking if any cell voltage exceeds the VOV threshold. If a condition occurs whereby a cell voltage is above VOV and another cell voltage is below VUVREG, such as can happen in a heavily imbalanced pack, then the OUT pin is activated and the regulator is disabled.