JAJS391E March   2001  – January 2025 TPS792

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Pin Configuration and Functions
  6. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Characteristics
  7. 6 Detailed Description
    1. 6.1 Overview
    2. 6.2 Functional Block Diagrams
    3. 6.3 Feature Description
      1. 6.3.1 Undervoltage Lockout (UVLO)
      2. 6.3.2 Shutdown
      3. 6.3.3 Active Discharge (New Chip)
      4. 6.3.4 Foldback Current Limit
      5. 6.3.5 Thermal Protection
      6. 6.3.6 Reverse Current
    4. 6.4 Device Functional Modes
      1. 6.4.1 Normal Operation
      2. 6.4.2 Dropout Operation
      3. 6.4.3 Disabled
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Adjustable Operation
      2. 7.1.2 Exiting Dropout
    2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
        1. 7.2.2.1 Capacitor Recommendations
        2. 7.2.2.2 Input and Output Capacitor Requirements
        3. 7.2.2.3 Noise Reduction and Feed-Forward Capacitor Requirements
      3. 7.2.3 Application Curves
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
        1. 7.4.1.1 Board Layout Recommendations to Improve PSRR and Noise Performance
        2. 7.4.1.2 Power Dissipation and Junction Temperature
      2. 7.4.2 Layout Example
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Development Support
        1. 8.1.1.1 Evaluation Modules
        2. 8.1.1.2 Spice Models
      2. 8.1.2 Device Nomenclature
    2. 8.2 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 ドキュメントの更新通知を受け取る方法
    4. 8.4 サポート・リソース
    5. 8.5 Trademarks
    6. 8.6 静電気放電に関する注意事項
    7. 8.7 用語集
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.2.2.2 Input and Output Capacitor Requirements

A 0.1μF or larger ceramic input bypass capacitor, connected between IN and GND and located close to the legacy chip of TPS792xx, is required for stability and improves transient response, noise rejection, and ripple rejection. A 1μF or larger ceramic input bypass capacitor, connected between IN and GND and located close to the new chip of TPS792xx, is required for stability and improves transient response, noise rejection, and ripple rejection. A higher-value input capacitor can be necessary if large, fast-rise-time load transients are anticipated or the device is located several inches from the power source.

Like most low-dropout regulators, the TPS792xx requires an output capacitor connected between OUT and GND to stabilize the internal control loop. The minimum recommended capacitance is 2.2μF. Any 2.2μF or larger ceramic capacitor is suitable, provided the capacitance does not vary significantly over temperature. If load current is not expected to exceed 100 mA, a 1.0μF ceramic capacitor can be used. If a feed-forward capacitor is not used (such as in a unity-gain configuration) or if an output voltage less than 1.8V is chosen, then the minimum recommended output capacitor is 4.7μF instead of 2.2μF. The table below lists the recommended output capacitor sizes for several common configurations.

Table 7-3 Output Capacitor Sizing
ConditionCOUT (µF)
VOUT < 1.8V or CFF = 0nF4.7
VOUT > 1.8V, IOUT > 100mA2.2
VOUT > 1.8V, IOUT < 100mA1