SNOSB24C October   2008  – November 2025 LM5576-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 / Standby
      2. 6.3.2 Soft Start
      3. 6.3.3 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 / Input Dropout Voltage
      6. 6.4.6 Boost Pin
      7. 6.4.7 Current Limit
  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
        5. 7.2.2.5  C3 (CRAMP)
        6. 7.2.2.6  C9, C10
        7. 7.2.2.7  D1
        8. 7.2.2.8  C1, C2
        9. 7.2.2.9  C8
        10. 7.2.2.10 C7
        11. 7.2.2.11 C4
        12. 7.2.2.12 R5, R6
        13. 7.2.2.13 R1, R2, C12
        14. 7.2.2.14 R7, C11
        15. 7.2.2.15 R4, C5, C6
      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 Documentation Support
      1. 8.2.1 Related Documentation
    3. 8.3 Receiving Notification of Documentation Updates
    4. 8.4 Support Resources
    5. 8.5 Trademarks
    6. 8.6 Electrostatic Discharge Caution
    7. 8.7 Glossary
  10. 9 Revision History
  11. 10Mechanical, Packaging, and Orderable Information

7.2.2.2 External Components

The procedure for calculating the external components is shown with the following design example. The Bill of Materials for this design is listed in Table 7-1.

Table 7-1 5V, 3A Demo Board Bill of Materials
ITEMPART NUMBERDESCRIPTIONVALUE
C1C4532X7R2A225MCAPACITOR, CER, TDK2.2 µ, 100V
C2C4532X7R2A225MCAPACITOR, CER, TDK2.2 µ, 100V
C3C0805C331G1GACCAPACITOR, CER, KEMET330p, 100V
C4C2012X7R2A103KCAPACITOR, CER, TDK0.01 µ, 100V
C5C2012X7R2A103KCAPACITOR, CER, TDK0.01 µ, 100V
C6OPENNOT USED
C7C2012X7R2A223KCAPACITOR, CER, TDK0.022 µ, 100V
C8C2012X7R1C474MCAPACITOR, CER, TDK0.47 µ, 16V
C9C3225X7R1C226MCAPACITOR, CER, TDK22 µ, 16V
C10EEFHE0J151RCAPACITOR, SP, PANASONIC150 µ, 6.3V
C11C0805C331G1GACCAPACITOR, CER, KEMET330p, 100V
C12OPENNOT USED
D1CSHD6-100CDIODE, 100V, CENTRAL
6CWQ10FNDIODE, 100V, IR (D1-ALT)
L1DR127-330INDUCTOR, COOPER33 µH
R1OPENNOT USED
R2OPENNOT USED
R3CRCW08052102FRESISTOR21kΩ
R4CRCW08054992FRESISTOR49.9kΩ
R5CRCW08055111FRESISTOR5.11kΩ
R6CRCW08051651FRESISTOR1.65kΩ
R7CRCW2512100JRESISTOR10, 1W
U1LM5576-Q1REGULATOR, TEXAS INSTRUMENTS