ZHCSF93E December   2015  – August 2020 LMR23630

PRODUCTION DATA  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 Revision History
  5. 5 Device Comparison Table
  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 Switching Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Fixed Frequency Peak Current Mode Control
      2. 8.3.2  Adjustable Frequency
      3. 8.3.3  Adjustable Output Voltage
      4. 8.3.4  Enable/Sync
      5. 8.3.5  VCC, UVLO
      6. 8.3.6  Minimum ON-time, Minimum OFF-time and Frequency Foldback at Dropout Conditions
      7. 8.3.7  Power Good (PGOOD)
      8. 8.3.8  Internal Compensation and CFF
      9. 8.3.9  Bootstrap Voltage (BOOT)
      10. 8.3.10 Overcurrent and Short-Circuit Protection
      11. 8.3.11 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Active Mode
      3. 8.4.3 CCM Mode
      4. 8.4.4 Light Load Operation (PFM Version)
      5. 8.4.5 Light Load Operation (FPWM Version)
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Applications
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1  Custom Design With WEBENCH® Tools
        2. 9.2.2.2  Output Voltage Setpoint
        3. 9.2.2.3  Switching Frequency
        4. 9.2.2.4  Inductor Selection
        5. 9.2.2.5  Output Capacitor Selection
        6. 9.2.2.6  Feed-Forward Capacitor
        7. 9.2.2.7  Input Capacitor Selection
        8. 9.2.2.8  Bootstrap Capacitor Selection
        9. 9.2.2.9  VCC Capacitor Selection
        10. 9.2.2.10 Undervoltage Lockout Setpoint
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
    2. 11.2 Layout Example
    3. 11.3 Compact Layout for EMI Reduction
    4. 11.4 Ground Plane and Thermal Considerations
    5. 11.5 Feedback Resistors
  12. 12Device and Documentation Support
    1. 12.1 Device Support
      1. 12.1.1 Development Support
        1. 12.1.1.1 Custom Design With WEBENCH® Tools
    2. 12.2 接收文档更新通知
    3. 12.3 支持资源
    4. 12.4 Trademarks
    5. 12.5 静电放电警告
    6. 12.6 术语表
  13. 13Mechanical, Packaging, and Orderable Information

封装选项

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • DRR|12
  • DDA|8
散热焊盘机械数据 (封装 | 引脚)
订购信息

8.3.2 Adjustable Frequency

The switching frequency can be programmed for the adjustable-switching-frequency version of LMR23630 by the impedance RT from the RT pin to ground. The frequency is inversely proportional to the RT resistance. The RT pin can be left floating and the LMR23630 operates at 400-kHz default switching frequency. The RT pin is not designed to be shorted to ground. For a desired frequency, typical RT resistance can be found by Equation 1. Table 8-1 gives typical RT values for a given fSW.

Equation 1. RT(kΩ) = 40200 / fSW(kHz) – 0.6
GUID-DEF90936-2F3B-473F-BB72-8F7A67482CFC-low.pngFigure 8-2 RT vs Frequency Curve
Table 8-1 Typical Frequency Setting RT Resistance
fSW (kHz) RT (kΩ)
200200
350115
50078.7
75053.6
100039.2
150026.1
200019.6
220017.8
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