ZHCSAM1F December   2012  – December 2017 TPS7A66-Q1 , TPS7A69-Q1

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      硬件启用选项
      2.      输入电压感测选项
  4. 4 修订历史记录
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 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 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Enable (EN)
      2. 7.3.2 Regulated Output (VOUT)
      3. 7.3.3 Power-On Reset (PG)
      4. 7.3.4 Reset Delay Timer (CT)
      5. 7.3.5 Sense Comparator (SI and SO for TPS7A69-Q1)
      6. 7.3.6 Adjustable Output Voltage (FB for TPS7A6601-Q1)
      7. 7.3.7 Undervoltage Shutdown
      8. 7.3.8 Low-Voltage Tracking
      9. 7.3.9 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Regulation
      2. 7.4.2 Disabled
      3. 7.4.3 Operation With V(VinUVLO)< VIN < VIN(min)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      1. 8.2.1 TPS7A66-Q1 Typical Application
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Input Capacitor
          2. 8.2.1.2.2 Output Capacitor
        3. 8.2.1.3 Application Curve
      2. 8.2.2 TPS7A69-Q1 Typical Application
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
          1. 8.2.2.2.1 Low-Voltage Tracking Threshold
        3. 8.2.2.3 Application Curve
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Package Mounting
      2. 10.1.2 Board Layout Recommendations to Improve PSRR and Noise Performance
    2. 10.2 Layout Examples
    3. 10.3 Power Dissipation and Thermal Considerations
  11. 11器件和文档支持
    1. 11.1 相关链接
    2. 11.2 接收文档更新通知
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 Glossary
  12. 12机械、封装和可订购信息

10.1.2 Board Layout Recommendations to Improve PSRR and Noise Performance

For the layout of TPS7A66-Q1 and TPS7A69-Q1, place the input and output capacitors close to the devices as shown in Figure 28 and Figure 29, respectively. In order to enhance the thermal performance, TI recommends surrounding the device with some vias.

To improve ac performance such as PSRR, output noise, and transient response, TI recommends a board design with separate ground planes for VIN and VOUT, with each ground plane connected only at the GND pin of the device. In addition, the ground connection for the output capacitor should connect directly to the GND pin of the device.

Minimize equivalent series inductance (ESL) and ESR in order to maximize performance and ensure stability. Place every capacitor as close as possible to the device and on the same side of the PCB as the regulator itself.

Do not place any of the capacitors on the opposite side of the PCB from where the regulator is installed. TI strongly discourages the use of vias and long traces because they may impact system performance negatively and even cause instability.

If possible, and to ensure the maximum performance specified in this product data sheet, use the same layout pattern used for the TPS7A66-Q1 and TPS7A69-Q1 evaluation board, available at www.ti.com.
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