JAJSDR0A July   2017  – September 2017 TPS7A39

PRODUCTION DATA.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
  4. 4 改訂履歴
  5. 5 Pin Configuration and 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 Startup Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Voltage Regulation
        1. 7.3.1.1 DC Regulation
        2. 7.3.1.2 AC and Transient Response
      2. 7.3.2 User-Settable Buffered Reference
      3. 7.3.3 Active Discharge
      4. 7.3.4 System Start-Up Controls
        1. 7.3.4.1 Start-Up Tracking
        2. 7.3.4.2 Sequencing
          1. 7.3.4.2.1 Enable (EN)
          2. 7.3.4.2.2 Undervoltage Lockout (UVLO) Control
    4. 7.4 Device Functional Modes
      1. 7.4.1 Normal Operation
      2. 7.4.2 Dropout Operation
      3. 7.4.3 Disabled
  8. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1  Setting the Output Voltages on Adjustable Devices
      2. 8.1.2  Capacitor Recommendations
      3. 8.1.3  Input and Output Capacitor (CINx and COUTx)
      4. 8.1.4  Feed-Forward Capacitor (CFFx)
      5. 8.1.5  Noise-Reduction and Soft-Start Capacitor (CNR/SS)
      6. 8.1.6  Buffered Reference Voltage
      7. 8.1.7  Overriding Internal Reference
      8. 8.1.8  Start-Up
        1. 8.1.8.1 Soft-Start Control (NR/SS)
          1. 8.1.8.1.1 In-Rush Current
        2. 8.1.8.2 Undervoltage Lockout (UVLOx) Control
      9. 8.1.9  AC and Transient Performance
        1. 8.1.9.1 Power-Supply Rejection Ratio (PSRR)
        2. 8.1.9.2 Channel-to-Channel Output Isolation and Crosstalk
        3. 8.1.9.3 Output Voltage Noise
        4. 8.1.9.4 Optimizing Noise and PSRR
        5. 8.1.9.5 Load Transient Response
      10. 8.1.10 DC Performance
        1. 8.1.10.1 Output Voltage Accuracy (VOUTx)
        2. 8.1.10.2 Dropout Voltage (VDO)
      11. 8.1.11 Reverse Current
      12. 8.1.12 Power Dissipation (PD)
        1. 8.1.12.1 Estimating Junction Temperature
    2. 8.2 Typical Applications
      1. 8.2.1 Design 1: Single-Ended to Differential Isolated Supply
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Switcher Choice
          2. 8.2.1.2.2 Full Bridge Rectifier With Center-Tapped Transformer
          3. 8.2.1.2.3 Total Solution Efficiency
          4. 8.2.1.2.4 Feedback Resistor Selection
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Design 2: Getting the Full Range of a SAR ADC
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Detailed Design Description
          1. 8.2.2.3.1 Regulation of -0.2 V
          2. 8.2.2.3.2 Feedback Resistor Selection
        4. 8.2.2.4 Application Curves
  9. 9 Power-Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Board Layout Recommendations to Improve PSRR and Noise Performance
    2. 10.2 Layout Example
    3. 10.3 Package Mounting
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 デバイス・サポート
      1. 11.1.1 開発サポート
        1. 11.1.1.1 評価モジュール
        2. 11.1.1.2 SPICEモデル
    2. 11.2 ドキュメントのサポート
      1. 11.2.1 関連資料
    3. 11.3 ドキュメントの更新通知を受け取る方法
    4. 11.4 コミュニティ・リソース
    5. 11.5 商標
    6. 11.6 静電気放電に関する注意事項
    7. 11.7 Glossary
  12. 12メカニカル、パッケージ、および注文情報

9 Power-Supply Recommendations

The input supply for the LDO must be within the recommended operating conditions. The input voltage must provide adequate headroom in order for the device to have a regulated output. Place the 10-µF input capacitors as close to the device as possible. If the input supply is noisy, additional input capacitors can help improve the output noise performance.