SNVS593J October   2008  – November 2014 LM25085 , LM25085-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
  6. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling Ratings - LM25085
    3. 6.3 Handling Ratings - LM25085-Q1
    4. 6.4 Recommended Operating Conditions
    5. 6.5 Thermal Information
    6. 6.6 Electrical Characteristics
    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  Regulation Control Circuit
      2. 7.3.2  On-Time Timer
      3. 7.3.3  Shutdown
      4. 7.3.4  Current Limiting
      5. 7.3.5  Current Limit Off-Time
      6. 7.3.6  VCC Regulator
      7. 7.3.7  PGATE Driver Output
      8. 7.3.8  P-Channel MOSFET Selection
      9. 7.3.9  Soft-Start
      10. 7.3.10 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Standby Mode with VIN <4.5 V
      2. 7.4.2 RT Shutdown Mode
  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  RFB1 and RFB2
        2. 8.2.2.2  RT, PFET
        3. 8.2.2.3  L1
        4. 8.2.2.4  RSEN, RADJ
        5. 8.2.2.5  COUT
        6. 8.2.2.6  R3, C1, C2
        7. 8.2.2.7  Alternate Output Ripple Configurations
          1. 8.2.2.7.1 Reduced Ripple Configuration
          2. 8.2.2.7.2 Lowest Cost Configuration
        8. 8.2.2.8  CIN, CBYP
        9. 8.2.2.9  D1
        10. 8.2.2.10 CVCC
        11. 8.2.2.11 IC Power Dissipation
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
    2. 11.2 Related Links
    3. 11.3 Trademarks
    4. 11.4 Electrostatic Discharge Caution
    5. 11.5 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

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

9 Power Supply Recommendations

The devices are designed to operate from an input voltage supply range between 4.5 V and 42 V. This input supply must be well regulated. If the input supply is located more than a few inches from the device, additional bulk capacitance may be required at the input terminals of the converter in addition to the calculated values to limit the inductive spikes due to the input cables or wires.