JAJSVG8 October   2024 LM251772

PRODUCTION DATA  

  1.   1
  2. 1 特長
  3. 2 アプリケーション
  4. 3 概要
  5. 4 Device Comparison
  6. 5 Pin Configuration and Functions
  7. 6 Specifications
    1. 6.1 Absolute Maximum Ratings
    2. 6.2 Handling 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
  8. 7 Parameter Measurement Information
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Buck-Boost Control Scheme
        1. 8.3.1.1 Buck Mode
        2. 8.3.1.2 Boost Mode
        3. 8.3.1.3 Buck-Boost Mode
      2. 8.3.2  Power Save Mode
      3. 8.3.3  Reference System
        1. 8.3.3.1 VIO LDO and nRST-PIN
      4. 8.3.4  Supply Voltage Selection – VSMART Switch and Selection Logic
      5. 8.3.5  Enable and Undervoltage Lockout
        1. 8.3.5.1 UVLO
      6. 8.3.6  Internal VCC Regulators
        1. 8.3.6.1 VCC1 Regulator
        2. 8.3.6.2 VCC2 Regulator
      7. 8.3.7  Error Amplifier and Control
        1. 8.3.7.1 Output Voltage Regulation
        2. 8.3.7.2 Output Voltage Feedback
        3. 8.3.7.3 Voltage Regulation Loop
        4. 8.3.7.4 Dynamic Voltage Scaling
      8. 8.3.8  Output Voltage Discharge
      9. 8.3.9  Peak Current Sensor
      10. 8.3.10 Short Circuit - Hiccup Protection
      11. 8.3.11 Current Monitor/Limiter
        1. 8.3.11.1 Overview
        2. 8.3.11.2 Output Current Limitation
        3. 8.3.11.3 Output Current Monitor
      12. 8.3.12 Oscillator Frequency Selection
      13. 8.3.13 Frequency Synchronization
      14. 8.3.14 Output Voltage Tracking
        1. 8.3.14.1 Analog Voltage Tracking
        2. 8.3.14.2 Digital Voltage Tracking
      15. 8.3.15 Slope Compensation
      16. 8.3.16 Configurable Soft Start
      17. 8.3.17 Drive Pin
      18. 8.3.18 Dual Random Spread Spectrum – DRSS
      19. 8.3.19 Gate Driver
      20. 8.3.20 Cable Drop Compensation (CDC)
      21. 8.3.21 CFG-pin and R2D Interface
      22. 8.3.22 Advanced Monitoring Features
        1. 8.3.22.1  Overview
        2. 8.3.22.2  BUSY
        3. 8.3.22.3  OFF
        4. 8.3.22.4  VOUT
        5. 8.3.22.5  IOUT
        6. 8.3.22.6  INPUT
        7. 8.3.22.7  TEMPERATURE
        8. 8.3.22.8  CML
        9. 8.3.22.9  OTHER
        10. 8.3.22.10 ILIM_OP
        11. 8.3.22.11 nFLT/nINT Pin Output
        12. 8.3.22.12 Status Byte
      23. 8.3.23 Protection Features
        1. 8.3.23.1  Thermal Shutdown (TSD)
        2. 8.3.23.2  Over Current Protection
        3. 8.3.23.3  Output Over Voltage Protection 1 (OVP1)
        4. 8.3.23.4  Output Over Voltage Protection 2 (OVP2)
        5. 8.3.23.5  Input Voltage Protection (IVP)
        6. 8.3.23.6  Input Voltage Regulation (IVR)
        7. 8.3.23.7  Power Good
        8. 8.3.23.8  Boot-Strap Under Voltage Protection
        9. 8.3.23.9  Boot-strap Over Voltage Clamp
        10. 8.3.23.10 CRC - CHECK
    4. 8.4 Device Functional Modes
      1. 8.4.1 Overview
      2. 8.4.2 Logic State Description
    5. 8.5 Programming
      1. 8.5.1 I2C Bus Operation
      2. 8.5.2 Clock Stretching
      3. 8.5.3 Data Transfer Formats
      4. 8.5.4 Single READ from a Defined Register Address
      5. 8.5.5 Sequential READ Starting from a Defined Register Address
      6. 8.5.6 Single WRITE to a Defined Register Address
      7. 8.5.7 Sequential WRITE Starting at a Defined Register Address
  10. 9 LM251772 Registers
  11. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1  Custom Design with WEBENCH Tools
        2. 10.2.2.2  Frequency
        3. 10.2.2.3  Feedback Divider
        4. 10.2.2.4  Inductor and Current Sense Resistor Selection
        5. 10.2.2.5  Output Capacitor
        6. 10.2.2.6  Input Capacitor
        7. 10.2.2.7  Slope Compensation
        8. 10.2.2.8  UVLO Divider
        9. 10.2.2.9  Soft-Start Capacitor
        10. 10.2.2.10 MOSFETs QH1 and QL1
        11. 10.2.2.11 MOSFETs QH2 and QL2
        12. 10.2.2.12 Loop Compensation
        13. 10.2.2.13 External Component Selection
      3. 10.2.3 Application Curves
    3. 10.3 Wireless Charging Supply
    4. 10.4 USB-PD Source with Power Path
    5. 10.5 Parallel (Multiphase) Operation
  12. 11Device and Documentation Support
    1. 11.1 Documentation Support
      1. 11.1.1 Related Documentation
    2. 11.2 ドキュメントの更新通知を受け取る方法
    3. 11.3 サポート・リソース
    4. 11.4 Trademarks
    5. 11.5 静電気放電に関する注意事項
    6. 11.6 用語集
  13. 12Revision History
  14. 13Mechanical, 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
発注情報

10.2.2.1 Custom Design with WEBENCH Tools

Click here to create a custom design using the LM251772 device with the WEBENCH® Power Designer.

  1. Start by entering your VIN, VOUT and IOUT requirements.
  2. Optimize your design for key parameters like efficiency, footprint and cost using the optimizer dial and compare this design with other possible solutions from Texas Instruments.
  3. WEBENCH Power Designer provides you with a customized schematic along with a list of materials with real time pricing and component availability.
  4. In most cases, you will also be able to:
    • Run electrical simulations to see important waveforms and circuit performance,
    • Run thermal simulations to understand the thermal performance of your board,
    • Export your customized schematic and layout into popular CAD formats,
    • Print PDF reports for the design, and share your design with colleagues.
  5. Get more information about WEBENCH tools at www.ti.com/webench.