JAJSFG6A May   2018  – July 2019 LM26420-Q1

PRODUCTION DATA.  

  1. 特長
  2. アプリケーション
  3. 概要
    1.     Device Images
      1.      LM26420デュアル降圧DC/DCコンバータ
      2.      LM26420の効率(最高93%)
  4. 改訂履歴
  5. Pin Configuration and Functions
    1.     Pin Functions: 16-Pin WQFN
    2.     Pin Functions 20-Pin HTSSOP
  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 Per Buck
    6. 6.6 Typical Characteristics
  7. Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Soft Start
      2. 7.3.2 Power Good
      3. 7.3.3 Precision Enable
    4. 7.4 Device Functional Modes
      1. 7.4.1 Output Overvoltage Protection
      2. 7.4.2 Undervoltage Lockout
      3. 7.4.3 Current Limit
      4. 7.4.4 Thermal Shutdown
  8. Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Programming Output Voltage
      2. 8.1.2 VINC Filtering Components
      3. 8.1.3 Using Precision Enable and Power Good
      4. 8.1.4 Overcurrent Protection
    2. 8.2 Typical Applications
      1. 8.2.1 2.2-MHz, 0.8-V Typical High-Efficiency Application Circuit
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 Inductor Selection
          3. 8.2.1.2.3 Input Capacitor Selection
          4. 8.2.1.2.4 Output Capacitor
          5. 8.2.1.2.5 Calculating Efficiency and Junction Temperature
        3. 8.2.1.3 Application Curves
      2. 8.2.2 2.2-MHz, 1.8-V Typical High-Efficiency Application Circuit
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
      3. 8.2.3 LM26420-Q12.2-MHz, 2.5-V Typical High-Efficiency Application Circuit
        1. 8.2.3.1 Design Requirements
        2. 8.2.3.2 Detailed Design Procedure
        3. 8.2.3.3 Application Curves
  9. Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Thermal Considerations
      1. 10.3.1 Method 1: Silicon Junction Temperature Determination
      2. 10.3.2 Thermal Shutdown Temperature Determination
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 デバイス・サポート
      1. 11.1.1 デベロッパー・ネットワークの製品に関する免責事項
      2. 11.1.2 WEBENCH®ツールによるカスタム設計
    2. 11.2 ドキュメントのサポート
      1. 11.2.1 関連資料
    3. 11.3 ドキュメントの更新通知を受け取る方法
    4. 11.4 コミュニティ・リソース
    5. 11.5 商標
    6. 11.6 静電気放電に関する注意事項
    7. 11.7 Glossary
  12. 12メカニカル、パッケージ、および注文情報

Typical Characteristics

All curves taken at VIN = 5 V with configuration in typical application circuits shown in Application and Implementation. TJ = 25°C, unless otherwise specified.
LM26420-Q1 30069682.png
Figure 1. Efficiency vs Load
LM26420-Q1 30069690.png
Figure 3. Efficiency vs Load
LM26420-Q1 30069641.png
Figure 5. Efficiency vs Load
LM26420-Q1 30069645_nvs579.gif
VIN = 3 V VOUT = 1.8 V
Figure 7. Load Regulation
LM26420-Q1 30069647.png
Figure 9. Oscillator Frequency vs Temperature,
LM26420-Q1 30069650_nvs579.gif
Figure 11. RDSON Bottom Vs Temperature
(WQFN-16 Package)
LM26420-Q1 30069692x_nvs579.gif
Figure 13. RDSON Bottom vs Temperature
(TSSOP-20 Package)
LM26420-Q1 30069659.png
Figure 15. VFB vs Temperature
LM26420-Q1 30069680_nvs579.gif
Figure 17. Reverse Current Limit vs Temperature
LM26420-Q1 C002_SNVS579.png
Figure 19. IQ (Quiescent Current) vs Temperature
(Q0 Grade)
LM26420-Q1 C005_SNVS579.png
Figure 21. Current Limit vs Temperature (Q0 Grade)
LM26420-Q1 C007_SNVS579.png
Figure 23. RDSON Top vs Temperature (Q0 Grade)
LM26420-Q1 C009_SNVS579.png
Figure 25. Oscillator Frequency vs Temperature (Q0 Grade)
LM26420-Q1 LM26420_Efficiency_Up_to_93_Percent.png
Figure 2. Efficiency vs Load
LM26420-Q1 30069688.png
Figure 4. Efficiency vs Load
LM26420-Q1 30069643_nvs579.gif
VIN = 5 V VOUT = 1.8 V
Figure 6. Load Regulation
LM26420-Q1 30069627_nvs579.gif
VOUT = 1.8 V IOUT = 1000 mA
Figure 8. Line Regulation
LM26420-Q1 30069649_nvs579.gif
Figure 10. RDSON Top Vs Temperature (WQFN-16 Package)
LM26420-Q1 30069691_nvs579.gif
Figure 12. RDSON Top Vs Temperature (TSSOP-20 Package)
LM26420-Q1 30069654_nvs579.gif
Figure 14. IQ (Quiescent Current Switching)
LM26420-Q1 30069653_nvs579.gif
VIN = 5 V and 3.3 V
Figure 16. Current Limit vs Temperature
LM26420-Q1 30069698.png
Figure 18. Short Circuit Waveforms
LM26420-Q1 C004_SNVS579.png
Figure 20. VFB vs Temperature (Q0 Grade)
LM26420-Q1 C006_SNVS579.png
Figure 22. Reverse Current Limit vs Temperature (Q0 Grade)
LM26420-Q1 C008_SNVS579.png
Figure 24. RDSON Bottom vs Temperature (Q0 Grade)