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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机械数据 (封装 | 引脚)
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订购信息

7.3.4 Load Switch/LDO Output and Control

The device integrates a low Iq load switch which can also be used as a regulated output. The LDO/LS has a dedicated input pin VINLS and can support up to 150 mA of load current.

The LS/LDO may be enabled/disabled through I2C. The output voltage is programmable using the LS_LDO bits in the registers. To limit voltage drop or voltage transients, a small ceramic capacitor must be placed close to VINLS pin.

Table 7-2 LDO Mode Control
I2C EN_LS_LDOLS_CONFIGLS/LDO OUTPUT
00Pulldown
01Pulldown
10LDO
11Load Switch

The current capability of the LDO will depend on the VINLS input voltage and the programmed output voltage. When the LS/LDO output is disabled through the register, an internal pull-down will discharge the output. The LDO has output current limit protection, limiting the output current in the event of a short in the output. When the LDO output current limit trips and is active for at least 1 ms, the device will set a flag and send an interrupt to the host. The host must take action to disable the LDO if desired. The LDO may be set to operate as a load switch by setting the LS_SWITCH_CONFG bit. Note that in order to change the configuration the LDO must be disabled first, then the LS_SWITCH_CONFG bit is set for it to take effect. This is not the case when updating the LDO output voltage which can be done on the fly without the need of disabling the LDO first.