ZHCSE18B July   2015  – November 2017 LM46000-Q1

PRODUCTION DATA.  

1. 1 特性
2. 2 應(yīng)用
3. 3 說明
   1.     Device Images
      1.      簡化原理圖
      2.      輻射發(fā)射圖 VOUT = 3.3V，VIN = 24V，F(xiàn)S= 500kHz，IOUT = 0.5A
4. 4 修訂歷史記錄
5. 5 Pin Configuration and Functions
   1.     Pin Functions
6. 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 Timing Requirements
   7. 6.7 Switching Characteristics
   8. 6.8 Typical Characteristics
7. 7 Detailed Description
   1. 7.1 Overview
   2. 7.2 Functional Block Diagram
   3. 7.3 Feature Description
      1. 7.3.1  Fixed Frequency Peak Current Mode Controlled Step-Down Regulator
      2. 7.3.2  Light Load Operation
      3. 7.3.3  Adjustable Output Voltage
      4. 7.3.4  Enable (ENABLE)
      5. 7.3.5  VCC, UVLO, and BIAS
      6. 7.3.6  Soft Start and Voltage Tracking (SS/TRK)
      7. 7.3.7  Switching Frequency (RT) and Synchronization (SYNC)
      8. 7.3.8  Minimum ON-Time, Minimum OFF-Time and Frequency Foldback at Drop-Out Conditions
      9. 7.3.9  Internal Compensation and CFF
      10. 7.3.10 Bootstrap Voltage (BOOT)
      11. 7.3.11 Power Good (PGOOD)
      12. 7.3.12 Overcurrent and Short-Circuit Protection
      13. 7.3.13 Thermal Shutdown
   4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
      4. 7.4.4 CCM Mode
      5. 7.4.5 Light Load Operation
      6. 7.4.6 Self-Bias Mode
8. 8 Applications and Implementation
   1. 8.1 Application Information
   2. 8.2 Typical Applications
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
         1. 8.2.2.1  Custom Design With WEBENCH® Tools
         2. 8.2.2.2  Output Voltage Setpoint
         3. 8.2.2.3  Switching Frequency
         4. 8.2.2.4  Input Capacitors
         5. 8.2.2.5  Inductor Selection
         6. 8.2.2.6  Output Capacitor Selection
         7. 8.2.2.7  Feed-Forward Capacitor
         8. 8.2.2.8  Bootstrap Capacitors
         9. 8.2.2.9  VCC Capacitor
         10. 8.2.2.10 BIAS Capacitors
         11. 8.2.2.11 Soft-Start Capacitors
         12. 8.2.2.12 Undervoltage Lockout Setpoint
         13. 8.2.2.13 PGOOD
      3. 8.2.3 Application Performance Curves
9. 9 Power Supply Recommendations
10. 10Layout
    1. 10.1 Layout Guidelines
       1. 10.1.1 Compact Layout for EMI Reduction
       2. 10.1.2 Ground Plane and Thermal Considerations
       3. 10.1.3 Feedback Resistors
    2. 10.2 Layout Example
11. 11器件和文檔支持
    1. 11.1 器件支持
       1. 11.1.1 開發(fā)支持
          1. 11.1.1.1 使用 WEBENCH® 工具創(chuàng)建定制設(shè)計
    2. 11.2 接收文檔更新通知
    3. 11.3 社區(qū)資源
    4. 11.4 商標(biāo)
    5. 11.5 靜電放電警告
    6. 11.6 Glossary
12. 12機械、封裝和可訂購信息