SNVS089P July   2000  – September 2026 LM3488

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: LM3488
    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 Slope Compensation Ramp
      2. 6.3.2 Frequency Adjust, Synchronization, Shutdown
      3. 6.3.3 Short-Circuit Protection
    4. 6.4 Device Functional Modes
  8. 7 Application and Implementation
    1. 7.1 Application Information
    2. 7.2 Typical Applications
      1. 7.2.1 Boost Converter
        1. 7.2.1.1 Design Requirements
        2. 7.2.1.2 Detailed Design Procedure
          1. 7.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 7.2.1.2.2 Power Inductor Selection
          3. 7.2.1.2.3 Programming the Output Voltage
          4. 7.2.1.2.4 Setting the Current Limit
          5. 7.2.1.2.5 Current Limit With External Slope Compensation
          6. 7.2.1.2.6 Power Diode Selection
          7. 7.2.1.2.7 Power MOSFET Selection
          8. 7.2.1.2.8 Input Capacitor Selection
          9. 7.2.1.2.9 Output Capacitor Selection
        3. 7.2.1.3 Application Curve
      2. 7.2.2 Designing SEPIC Using LM3488
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
          1. 7.2.2.2.1 Power MOSFET Selection
          2. 7.2.2.2.2 Power Diode Selection
          3. 7.2.2.2.3 Selection Of Inductors L1 and L2
          4. 7.2.2.2.4 Sense Resistor Selection
          5. 7.2.2.2.5 SEPIC Capacitor Selection
          6. 7.2.2.2.6 Input Capacitor Selection
          7. 7.2.2.2.7 Output Capacitor Selection
    3. 7.3 Power Supply Recommendations
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
  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
7.2.1.2.3 Programming the Output Voltage

The output voltage can be programmed using a resistor divider between the output and the feedback pins, as shown in Figure 7-4. The resistors are selected such that the voltage at the feedback pin is 1.26V. RF1 and RF2 can be selected using the equation,

Equation 14. LM3488

A 100pF capacitor can be connected between the feedback and ground pins to reduce noise.

LM3488 Adjusting the Output VoltageFigure 7-4 Adjusting the Output Voltage