JAJSAB5F December   2006  – November 2016 LP38853

PRODUCTION DATA.  

  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
  4. 4 改訂履歴
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 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
    6. 6.6 Timing Requirements
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Undervoltage Lockout (UVLO)
      2. 7.3.2 Supply Sequencing
      3. 7.3.3 Reverse Voltage
      4. 7.3.4 Soft-Start
      5. 7.3.5 Setting The Output Voltage
      6. 7.3.6 Enable (EN) Operation
    4. 7.4 Device Functional Modes
      1. 7.4.1 Input Voltage
      2. 7.4.2 Bias Voltage
      3. 7.4.3 Enable Operation
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1 External Capacitors
          1. 8.2.2.1.1 Input Capacitor
          2. 8.2.2.1.2 Output Capacitor
          3. 8.2.2.1.3 Bias Capacitor
          4. 8.2.2.1.4 Set The Output Voltage
          5. 8.2.2.1.5 Feed Forward Capacitor, CFF
        2. 8.2.2.2 Power Dissipation and Heat Sinking
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
  11. 11デバイスおよびドキュメントのサポート
    1. 11.1 ドキュメントのサポート
      1. 11.1.1 関連資料
    2. 11.2 コミュニティ・リソース
    3. 11.3 商標
    4. 11.4 静電気放電に関する注意事項
    5. 11.5 Glossary
  12. 12メカニカル、パッケージ、および注文情報
  13. 12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

7.3.2 Supply Sequencing

There is no requirement for the order that VIN or VBIAS are applied or removed.

One practical limitation is that the soft-start circuit starts charging CSS when both VBIAS rises above the UVLO threshold and the EN pin is above the VEN(ON) threshold. If the application of VIN is delayed beyond this point the benefits of soft start are compromised.

In any case, the output voltage cannot be ensured until both VIN and VBIAS are within the range of specified operating values.

If used in a dual-supply system where the regulator output load is returned to a negative supply, the output pin must be diode clamped to ground. A Schottky diode is recommended for this diode clamp.