ZHCSSB2G march   2008  – june 2023 TPS799-Q1

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 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagrams
    3. 7.3 Feature Description
      1. 7.3.1 Internal Current Limit
      2. 7.3.2 Shutdown
      3. 7.3.3 Dropout Voltage
      4. 7.3.4 Start-Up
      5. 7.3.5 Undervoltage Lockout (UVLO)
    4. 7.4 Device Functional Modes
  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 and Output Capacitor Requirements
        2. 8.2.2.2 Feedback Capacitor Requirements (TPS79901-Q1 Only)
        3. 8.2.2.3 Output Noise
        4. 8.2.2.4 Transient Response
        5. 8.2.2.5 Minimum Load
      3. 8.2.3 Application Curve
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Board Layout Recommendations to Improve PSRR and Noise Performance
        2. 8.4.1.2 Thermal Consideration
        3. 8.4.1.3 Power Dissipation
        4. 8.4.1.4 Package Mounting
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Documentation Support
      1. 9.1.1 Related Documentation
    2. 9.2 接收文档更新通知
    3. 9.3 支持资源
    4. 9.4 Trademarks
    5. 9.5 静电放电警告
    6. 9.6 术语表
  11. 10Mechanical, Packaging, and Orderable Information

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8.1 Application Information

The TPS799-Q1 LDO regulator combines the high performance required of many RF and precision analog applications with ultra-low current consumption. High PSRR is provided by a high gain, high bandwidth error loop with good supply rejection at very low headroom (VIN – VOUT). Fixed-voltage versions provide a noise reduction pin to bypass noise generated by the band-gap reference and to improve PSRR while a quick-start circuit fast-charges this capacitor at start-up. The combination of high performance and low ground current also make the TPS799-Q1 designed for portable applications. All versions have thermal and overcurrent protection and are fully specified from –40°C to +125°C.

Figure 8-1 shows the basic circuit connections for fixed-voltage model. Figure 8-2 gives the connections for the adjustable output version (TPS79901-Q1). R1 and R2 can be calculated for any output voltage using the formula in Figure 8-2. Sample resistor values for common output voltages are shown in Figure 8-2.