ZHCSKV4 February   2020 LM60430 , LM60440

ADVANCE INFORMATION for pre-production products; subject to change without notice.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化原理图
      2.      效率与输出电流间的关系 VOUT = 5V，400kHz
  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 Characteristics
    7. 7.7 System 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 Dropout
      3. 8.4.3 Minimum Switch On-Time
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1  Choosing the Switching Frequency
        2. 9.2.2.2  Setting the Output Voltage
        3. 9.2.2.3  Inductor Selection
        4. 9.2.2.4  Output Capacitor Selection
        5. 9.2.2.5  Input Capacitor Selection
        6. 9.2.2.6  CBOOT
        7. 9.2.2.7  VCC
        8. 9.2.2.8  CFF Selection
        9. 9.2.2.9  External UVLO
        10. 9.2.2.10 Maximum Ambient Temperature
      3. 9.2.3 Application Curves
    3. 9.3 EMI
    4. 9.4 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
        1. 12.1.1.1 使用 WEBENCH® 工具创建定制设计方案
    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

9.2.1 Design Requirements

Table 1 provides the parameters for our detailed design procedure example:

Table 1. Detailed Design Parameters

DESIGN PARAMETER EXAMPLE VALUE
Input voltage 12 V (6 V to 36 V)
Output voltage 5 V
Maximum output current 0 A to 4 A
Switching frequency 400 kHz

Table 2. LM60440 Typical External Component Values

ƒSW (kHz) VOUT (V) L (µH) COUT (RATED CAPACITANCE) RFBT (Ω) RFBB (Ω) CIN + CHF CBOOT CVCC CFF
400 3.3 4.7 3 × 47 µF 100 k 43.2 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
1000 3.3 2.2 2 × 22 µF 100 k 43.2 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
400 5 6.8 4 × 47 µF + 22 µF 100 k 24.9 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
1000 5 3.3 2 × 22 µF 100 k 24.9 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
400 12 15 4 × 22 µF 100 k 9.09 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
1000 12 5.2 4 × 10 µF 100 k 9.09 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open

Table 3. LM60430 Typical External Component Values

ƒSW (kHz) VOUT (V) L (µH) COUT (RATED CAPACITANCE) RFBT (Ω) RFBB (Ω) CIN + CHF CBOOT CVCC CFF
400 3.3 5.6 4 × 22 µF 100 k 43.2 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
1000 3.3 3.3 3 × 22 µF 100 k 43.2 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
400 5 8.2 4 × 22 µF 100 k 24.9 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
1000 5 4.7 3 × 22 µF 100 k 24.9 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
400 12 15 4 × 22 µF 100 k 9.09 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
1000 12 6.8 3 × 22 µF 100 k 9.09 k 4.7 µF + 2 × 220 nF 100 nF 1 µF open
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