JAJSIO5B July   2019  – February 2020 LMR36506-Q1

ADVANCE INFORMATION for pre-production products; subject to change without notice.  

  1. 1 特長
  2. 2 アプリケーション
  3. 3 概要
    1.     Device Images
      1.      概略回路図
      2.      効率と出力電流の関係 VOUT = 3.3V (固定)、2.2MHz
  4. 4 改訂履歴
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD (Automotive) Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Characteristics
    7. 7.7 Switching Characteristics
    8. 7.8 System Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Output Voltage Selection
      2. 8.3.2  Enable and Start-up
      3. 8.3.3  External CLK SYNC (with MODE/SYNC)
      4. 8.3.4  Adjustable Switching Frequency (with RT)
      5. 8.3.5  Power-Good Flag Output
      6. 8.3.6  Internal LDO, VCC UVLO, and VOUT/BIAS Input
      7. 8.3.7  Bootstrap Voltage and VCBOOT-UVLO (CBOOT Terminal)
      8. 8.3.8  Spread Spectrum
      9. 8.3.9  Soft Start and Recovery from Dropout
        1. 8.3.9.1 Recovery from Dropout
      10. 8.3.10 Current Limit and Short Circuit
      11. 8.3.11 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Standby Mode
      3. 8.4.3 Active Mode
      4. 8.4.4 Continuous Conduction Mode (CCM)
      5. 8.4.5 Discontinuous Conduction Mode (DCM)
      6. 8.4.6 Pulse Frequency Modulation (PFM)
      7. 8.4.7 Forced Pulse Width Modulation Mode (FPWM)
      8. 8.4.8 Dropout Mode
  9. 9 Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Choosing the Switching Frequency
        2. 9.2.2.2 Setting the Output Voltage
          1. 9.2.2.2.1 FB for Adjustable Output
        3. 9.2.2.3 Inductor Selection
        4. 9.2.2.4 Output Capacitor Selection
        5. 9.2.2.5 Input Capacitor Selection
        6. 9.2.2.6 CBOOT
        7. 9.2.2.7 VCC
        8. 9.2.2.8 CFF Selection
          1. 9.2.2.8.1 External UVLO
        9. 9.2.2.9 Maximum Ambient Temperature
    3. 9.3 What to Do and What Not to Do
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Ground and Thermal Considerations
    2. 11.2 Layout Example
  12. 12デバイスおよびドキュメントのサポート
    1. 12.1 ドキュメントのサポート
      1. 12.1.1 関連資料
    2. 12.2 ドキュメントの更新通知を受け取る方法
    3. 12.3 サポート・リソース
    4. 12.4 商標
    5. 12.5 静電気放電に関する注意事項
    6. 12.6 Glossary
  13. 13メカニカル、パッケージ、および注文情報

パッケージ・オプション

メカニカル・データ（パッケージ｜ピン）
サーマルパッド・メカニカル・データ
発注情報

8.3.2 Enable and Start-up

Voltage on the EN pin controls the ON or OFF functionality of the LMR36506-Q1. The part stays in shutdown mode as long as the EN pin voltage is less than VEN-WAKE = 0.4 V. During the shutdown mode, the input current drawn by the device typically drops down to 1 µA. Applying a voltage at the EN pin greater than the VEN-WAKE causes the device to enter the standby mode, powering up the internal LDO to generate VCC. As the EN voltage further approaches VEN-VOUT, the device finally starts switching, allowing it to enter the start-up mode and begin the soft-start period. During the shutdown process, when the EN input is brought below VEN-VOUT by VEN-HYST, the regulator stops switching and re-enters the standby mode. Any further decrease in the EN pin voltage below VEN-WAKE finally shuts down the device. The EN input pin can be connected directly to VIN input pin if remote precision control is not needed. The EN input pin must not be allowed to float. The limits of various EN thresholds values listed here can be found in the Electrical Characteristics table.

LMR36506-Q1 FEATuvlFIG.gifFigure 2. VIN UVLO Using the EN pin