ZHCSKA2A September   2019  – February 2020 LMR36520

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      效率与输出电流间的关系 VOUT = 5V，400kHz
      2.      简化原理图
  4. 4 修订历史记录
  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 System Characteristics
    9. 7.9 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 Power-Good Flag Output
      2. 8.3.2 Enable and Start-up
      3. 8.3.3 Current Limit and Short Circuit
      4. 8.3.4 Undervoltage Lockout and Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Auto Mode
      2. 8.4.2 Forced PWM Operation
      3. 8.4.3 Dropout
      4. 8.4.4 Minimum Switch On-Time
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design 1: Low Power 24-V, 2-A Buck Converter
        1. 9.2.1.1 Design Requirements
        2. 9.2.1.2 Detailed Design Procedure
          1. 9.2.1.2.1  Choosing the Switching Frequency
          2. 9.2.1.2.2  Setting the Output Voltage
          3. 9.2.1.2.3  Inductor Selection
          4. 9.2.1.2.4  Output Capacitor Selection
          5. 9.2.1.2.5  Input Capacitor Selection
          6. 9.2.1.2.6  CBOOT
          7. 9.2.1.2.7  VCC
          8. 9.2.1.2.8  CFF Selection
          9. 9.2.1.2.9  External UVLO
          10. 9.2.1.2.10 Maximum Ambient Temperature
      2. 9.2.2 Application Curves
    3. 9.3 What to Do and What Not to Do
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Ground and Thermal Considerations
    2. 11.2 Layout Example
  12. 12器件和文档支持
    1. 12.1 器件支持
      1. 12.1.1 开发支持
    2. 12.2 文档支持
      1. 12.2.1 相关文档
    3. 12.3 接收文档更新通知
    4. 12.4 支持资源
    5. 12.5 商标
    6. 12.6 静电放电警告
    7. 12.7 Glossary
  13. 13机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

9.2 Typical Application

shows a typical application circuit for the LMR36520. This device is designed to function over a wide range of external components and system parameters. However, the internal compensation is optimized for a certain range of external inductance and output capacitance. As a quick-start guide, Figure 13 provides typical component values for a range of the most common output voltages.

LMR36520 typical_apps_circuit_20-ADJ-output.gifFigure 13. Example Application Circuit

Table 2. Typical External Component Values

ƒSW (kHz) VOUT (V) L (µH) NOMINAL COUT (RATED CAPACITANCE) (1) MINIMUM COUT (RATED CAPACITANCE) (2) RFBT (Ω) RFBB (Ω) CIN CFF
400 3.3 6.8 3 × 22 µF 3 × 22 µF 100 k 43.2 k 2 × 4.7 µF + 220 nF None
400 5 10 2 × 22 µF 2 × 22 µF 100 k 24.9 k 2 × 4.7 µF + 220 nF None
400 12 33 4 × 10 µF 4 × 10 µF 100 k 9.09 k 2 × 4.7 µF + 220 nF None
(1) Optimized for superior load transient performance from 0 to 100% rated load.
(2) Optimized for size constrained end applications.
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