SNVSB35C May   2018  – November 2024 LM26420-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 Per Buck
    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 Soft Start
      2. 6.3.2 Power Good
      3. 6.3.3 Precision Enable
    4. 6.4 Device Functional Modes
      1. 6.4.1 Output Overvoltage Protection
      2. 6.4.2 Undervoltage Lockout
      3. 6.4.3 Current Limit
      4. 6.4.4 Thermal Shutdown
  8. 7 Application and Implementation
    1. 7.1 Application Information
      1. 7.1.1 Programming Output Voltage
      2. 7.1.2 VINC Filtering Components
      3. 7.1.3 Using Precision Enable and Power Good
      4. 7.1.4 Overcurrent Protection for HTSSOP-20 Package
      5. 7.1.5 Current Limit and Short-Circuit Protection for WQFN-16 Package
    2. 7.2 Typical Applications
      1. 7.2.1 2.2-MHz, 0.8-V Typical High-Efficiency Application Circuit
        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 Inductor Selection
          3. 7.2.1.2.3 Input Capacitor Selection
          4. 7.2.1.2.4 Output Capacitor
          5. 7.2.1.2.5 Calculating Efficiency and Junction Temperature
        3. 7.2.1.3 Application Curves
      2. 7.2.2 2.2-MHz, 1.8-V Typical High-Efficiency Application Circuit
        1. 7.2.2.1 Design Requirements
        2. 7.2.2.2 Detailed Design Procedure
        3. 7.2.2.3 Application Curves
      3. 7.2.3 LM26420-Q12.2-MHz, 2.5-V Typical High-Efficiency Application Circuit
        1. 7.2.3.1 Design Requirements
        2. 7.2.3.2 Detailed Design Procedure
        3. 7.2.3.3 Application Curves
    3. 7.3 Power Supply Recommendations
      1. 7.3.1 Power Supply Recommendations - HTSSOP-20 Package
      2. 7.3.2 Power Supply Recommendations - WQFN-16 Package
    4. 7.4 Layout
      1. 7.4.1 Layout Guidelines
      2. 7.4.2 Layout Example
      3. 7.4.3 Thermal Considerations
        1. 7.4.3.1 Method 1: Silicon Junction Temperature Determination
        2. 7.4.3.2 Thermal Shutdown Temperature Determination
  9. 8 Device and Documentation Support
    1. 8.1 Device Support
      1. 8.1.1 Third-Party Products Disclaimer
      2. 8.1.2 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

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5.6 Typical Characteristics

All curves taken at VIN = 5 V with configuration in typical application circuits shown in Section 7. TJ = 25°C, unless otherwise specified.

LM26420-Q1 Efficiency vs LoadFigure 5-1 Efficiency vs Load
LM26420-Q1 Efficiency vs LoadFigure 5-3 Efficiency vs Load
LM26420-Q1 Efficiency vs LoadFigure 5-5 Efficiency vs Load
LM26420-Q1 Load Regulation
VIN = 3 V VOUT = 1.8 V
Figure 5-7 Load Regulation
LM26420-Q1 Oscillator Frequency vs Temperature,Figure 5-9 Oscillator Frequency vs Temperature,
LM26420-Q1 RDSON Bottom Vs Temperature (WQFN-16 Package)Figure 5-11 RDSON Bottom Vs Temperature (WQFN-16 Package)
LM26420-Q1 RDSON Bottom vs Temperature (HTSSOP-20 Package)Figure 5-13 RDSON Bottom vs Temperature (HTSSOP-20 Package)
LM26420-Q1 VFB vs TemperatureFigure 5-15 VFB vs Temperature
LM26420-Q1 Reverse Current Limit vs TemperatureFigure 5-17 Reverse Current Limit vs Temperature
LM26420-Q1 IQ (Quiescent Current) vs Temperature (Q0 Grade)Figure 5-19 IQ (Quiescent Current) vs Temperature (Q0 Grade)
LM26420-Q1 Current Limit vs Temperature (Q0 Grade)Figure 5-21 Current Limit vs Temperature (Q0 Grade)
LM26420-Q1 RDSON Top vs Temperature (Q0 Grade)Figure 5-23 RDSON Top vs Temperature (Q0 Grade)
LM26420-Q1 Oscillator Frequency vs Temperature (Q0 Grade)Figure 5-25 Oscillator Frequency vs Temperature (Q0 Grade)
LM26420-Q1 Efficiency vs LoadFigure 5-2 Efficiency vs Load
LM26420-Q1 Efficiency vs LoadFigure 5-4 Efficiency vs Load
LM26420-Q1 Load Regulation
VIN = 5 V VOUT = 1.8 V
Figure 5-6 Load Regulation
LM26420-Q1 Line Regulation
VOUT = 1.8 V IOUT = 1000 mA
Figure 5-8 Line Regulation
LM26420-Q1 RDSON Top Vs Temperature (WQFN-16 Package)Figure 5-10 RDSON Top Vs Temperature (WQFN-16 Package)
LM26420-Q1 RDSON Top Vs Temperature (HTSSOP-20 Package)Figure 5-12 RDSON Top Vs Temperature (HTSSOP-20 Package)
LM26420-Q1 IQ (Quiescent Current Switching)Figure 5-14 IQ (Quiescent Current Switching)
LM26420-Q1 Current Limit vs Temperature
VIN = 5 V and 3.3 V
Figure 5-16 Current Limit vs Temperature
LM26420-Q1 Short-Circuit WaveformsFigure 5-18 Short-Circuit Waveforms
LM26420-Q1 VFB vs Temperature (Q0 Grade)Figure 5-20 VFB vs Temperature (Q0 Grade)
LM26420-Q1 Reverse Current Limit vs Temperature (Q0 Grade)Figure 5-22 Reverse Current Limit vs Temperature (Q0 Grade)
LM26420-Q1 RDSON Bottom vs Temperature (Q0 Grade)Figure 5-24 RDSON Bottom vs Temperature (Q0 Grade)