ZHCSK78A september   2019  – august 2023 BQ21061

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  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 Timing Requirements
    7. 6.7 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  Linear Charger and Power Path
        1. 7.3.1.1 Battery Charging Process
        2. 7.3.1.2 JEITA and Battery Temperature Dependent Charging
        3. 7.3.1.3 Input Voltage Based Dynamic Power Management (VINDPM) and Dynamic Power Path Management (DPPM)
        4. 7.3.1.4 Battery Supplement Mode
      2. 7.3.2  Protection Mechanisms
        1. 7.3.2.1 Input Over-Voltage Protection
        2. 7.3.2.2 Safety Timer and I2C Watchdog Timer
        3. 7.3.2.3 Thermal Protection and Thermal Charge Current Foldback
        4. 7.3.2.4 Battery Short and Over Current Protection
        5. 7.3.2.5 PMID Short Circuit
      3. 7.3.3  VDD LDO
      4. 7.3.4  Load Switch/LDO Output and Control
      5. 7.3.5  PMID Power Control
      6. 7.3.6  System Voltage (PMID) Regulation
      7. 7.3.7  MR Wake and Reset Input
        1. 7.3.7.1 MR Wake or Short Button Press Functions
        2. 7.3.7.2 MR Reset or Long Button Press Functions
      8. 7.3.8  14-Second Watchdog for HW Reset
      9. 7.3.9  Faults Conditions and Interrupts ( INT)
        1. 7.3.9.1 Flags and Fault Condition Response
      10. 7.3.10 Power Good ( PG) Pin
      11. 7.3.11 External NTC Monitoring (TS)
        1. 7.3.11.1 TS Thresholds
      12. 7.3.12 I2C Interface
        1. 7.3.12.1 F/S Mode Protocol
    4. 7.4 Device Functional Modes
      1. 7.4.1 Ship Mode
      2. 7.4.2 Low Power
      3. 7.4.3 Active Battery
      4. 7.4.4 Charger/Adapter Mode
      5. 7.4.5 Power-Up/Down Sequencing
    5. 7.5 Register Map
      1. 7.5.1 I2C Registers
  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
        1. 8.2.2.1 Input (IN/PMID) Capacitors
        2. 8.2.2.2 VDD, LDO Input and Output Capacitors
        3. 8.2.2.3 TS
        4. 8.2.2.4 Recommended Passive Components
      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 Device Support
      1. 11.1.1 第三方产品免责声明
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 接收文档更新通知
    4. 11.4 支持资源
    5. 11.5 静电放电警告
    6. 11.6 Trademarks
    7. 11.7 术语表
  13. 12Mechanical, Packaging, and Orderable Information

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订购信息

7.3.1 Linear Charger and Power Path

The BQ21061 IC integrates a linear charger that allows the battery to be charged with a programmable charge current of up to 500 mA. In addition to the charge current, other charging parameters can be programmed through I2C such as the battery regulation voltage, pre-charge current, termination current, and input current limit current.

The power path allows the system to be powered from PMID, even when the battery is dead or charging, by drawing power from IN pin. It also prioritizes the system load connected to PMID, reducing the charging current, if necessary, in order to support the load when input power is limited. If the input supply is removed and the battery voltage level is above VBATUVLO, PMID will automatically and seamlessly switch to battery power.

A more detailed description of the charger functionality is presented in the following sections of this document.