ZHCSBU8D October   2013  – April 2018

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      可调输出选项
      2.      固定输出选项
  4. 4 修订历史记录
  5. 5 Device Comparison
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  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 Electrical Characteristics
    6. 7.6 Timing Requirements
    7. 7.7 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagrams
    3. 8.3 Feature Description
      1. 8.3.1 Enable (EN)
      2. 8.3.2 Regulated Output (VOUT)
      3. 8.3.3 Power-On-Reset (RESET)
      4. 8.3.4 Reset Delay Timer (DELAY)
      5. 8.3.5 Adjustable Output Voltage (ADJ for TPS7B6701)
      6. 8.3.6 Undervoltage Shutdown
      7. 8.3.7 Thermal Shutdown
      8. 8.3.8 Thermal Protection
    4. 8.4 Device Functional Modes
      1. 8.4.1 Operation With VIN < 4 V
      2. 8.4.2 Operation With EN Control
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Power Dissipation and Thermal Considerations
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
    1. 10.1 Dropout Recovery
      1. 10.1.1 LDO Dropout Recovery Explained
      2. 10.1.2 TPS7B67xx-Q1 Dropout During Startup
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Enhanced Thermal Pad
      2. 11.1.2 Package Mounting
      3. 11.1.3 Board Layout Recommendations to Improve PSRR and Noise Performance
      4. 11.1.4 Additional Layout Considerations
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 相关链接
    2. 12.2 接收文档更新通知
    3. 12.3 社区资源
    4. 12.4 商标
    5. 12.5 静电放电警告
    6. 12.6 术语表
  13. 13机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

10.1.1 LDO Dropout Recovery Explained

When an LDO is in dropout the output voltage is below the accuracy specification. This condition causes the error amplifier to force the gate of the pass transistor such that the pass transistor is fully on and provides the least resistance possible, meaning VOUT tracks VIN as closely as possible. When the input voltage recovers, the error amplifier must force the gate of the pass device to the opposite rail making the pass transistor more resistive. The change in gate voltage takes a finite amount of time, as dictated by the bandwidth of the error amplifier. If VIN rises quickly during that time then VOUT tracks VIN and overshoots above the nominal output voltage. Figure 25 depicts a graphical representation of an LDO recovering from dropout.

The amplitude of the overshoot is determined by both the speed of the VIN ramp and the transient response of the LDO, which determines how long is required for the error amplifier to respond to changes on VOUT. The amount of time required for the overshoot to be discharged is determined by the load current that must drain the excess charge that has accumulated on COUT.

TPS7B6701-Q1 TPS7B6733-Q1 TPS7B6750-Q1 startup_dropout.gifFigure 25. LDO Response Entering and Exiting Dropout