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

9.2.3 Application Curves

Unless otherwise specified the following conditions apply: VIN = 12 V, TA = 25°C. The circuit is shown in Figure 17, with the appropriate BOM from Table 4.

LM60440 LM60430 Eff_5Vout_Low_load_PR.gif
VOUT = 5 V 400 kHz
Figure 11. Low-Load Efficiency
LM60440 LM60430 LoadReg_PR.gif
VOUT = 5 V
Figure 13. Line and Load Regulation
LM60440 LM60430 Load_transient_0_to_4A_PR.gif
VIN = 12 V VOUT = 5 V
IOUT = 0 A to 4 A tf = tr = 4 µs
Figure 15. Load Transient
LM60440 LM60430 Eff_5Vout_HighLoad_PR.gif
VOUT = 5 V 400 kHz
Figure 12. High-Load Efficiency
LM60440 LM60430 startup_4A_PR.gif
VIN = 13.5 V VOUT = 5 V IOUT = 4 A
Figure 14. Start-up
LM60440 LM60430 Load_transient_2_to_4A_PR.gif
VIN = 12 V VOUT = 5 V
tf = tr = 2 µs IOUT = 2 A to 4 A
Figure 16. Load Transient
LM60440 LM60430 typ_app_char_cir5.gifFigure 17. Circuit for Application Curves

Table 4. BOM for Typical Application Curves

VOUT FREQUENCY RFBB COUT CIN + CHF L U1
5 V 400 kHz 24.9 k 2 x 47 µF + 22µF 4.7 µF + 2 × 220 nF 6.8 µH, 20.8 mΩ LM60440ARPKPR
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