SNOSB22D October   2008  – April 2025 LM5574-Q1

PRODUCTION DATA  

1.   1
2. 1 Features
3. 2 Applications
4. 3 Description
5. 4 Pin Configuration and Functions
6. 5 Specifications
   1. 5.1 Absolute Maximum Ratings
   2. 5.2 ESD Ratings
   3. 5.3 Recommended Operating Conditions
   4. 5.4 Thermal Information
   5. 5.5 Electrical Characteristics
   6. 5.6 Typical Characteristics
7. 6 Detailed Description
   1. 6.1 Overview
   2. 6.2 Functional Block Diagram
   3. 6.3 Feature Description
      1. 6.3.1 Shutdown and Standby
      2. 6.3.2 Current Limit
      3. 6.3.3 Soft Start
      4. 6.3.4 Thermal Protection
   4. 6.4 Device Functional Modes
      1. 6.4.1 High Voltage Start-Up Regulator
      2. 6.4.2 Oscillator and Sync Capability
      3. 6.4.3 Error Amplifier and PWM Comparator
      4. 6.4.4 Ramp Generator
      5. 6.4.5 Maximum Duty Cycle and Input Dropout Voltage
      6. 6.4.6 Boost Pin
8. 7 Application and Implementation
   1. 7.1 Application Information
      1. 7.1.1 Bias Power Dissipation Reduction
   2. 7.2 Typical Application
      1. 7.2.1 Design Requirements
      2. 7.2.2 Detailed Design Procedure
         1. 7.2.2.1  Custom Design With WEBENCH? Tools
         2. 7.2.2.2  External Components
         3. 7.2.2.3  R3 (RT)
         4. 7.2.2.4  L1- Inductor
         5. 7.2.2.5  C3- Ramp Capacitor
         6. 7.2.2.6  C9 -Output Capacitor
         7. 7.2.2.7  D1 - Async Diode
         8. 7.2.2.8  C1- Input Capacitor
         9. 7.2.2.9  C8 - Vcc Capacitor
         10. 7.2.2.10 C7 - BST Capacitor
         11. 7.2.2.11 C4 - SS Capacitor
         12. 7.2.2.12 R5, R6 - Feedback Resistor
         13. 7.2.2.13 R1, R2, C2 - SD Pin Components
         14. 7.2.2.14 R4, C5, C6 - Compensation Components
      3. 7.2.3 Application Curves
   3. 7.3 Power Supply Recommendations
   4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
      3. 7.4.3 Power Dissipation
      4. 7.4.4 Thermal Considerations
9. 8 Device and Documentation Support
   1. 8.1 Device Support
      1. 8.1.1 Development Support
         1. 8.1.1.1 Custom Design With WEBENCH? Tools
   2. 8.2 Receiving Notification of Documentation Updates
   3. 8.3 Support Resources
   4. 8.4 Trademarks
   5. 8.5 Electrostatic Discharge Caution
   6. 8.6 Glossary
10. 9 Revision History
11. 10Mechanical, Packaging, and Orderable Information

LM5574-Q1 75V, 0.5A, Automotive, Step-Down Switching Regulator