SNVSC10 March   2022 LM25143

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Switching Characteristics
    7. 8.7 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  Input Voltage Range (VIN)
      2. 9.3.2  High-Voltage Bias Supply Regulator (VCC, VCCX, VDDA)
      3. 9.3.3  Enable (EN1, EN2)
      4. 9.3.4  Power-Good Monitor (PG1, PG2)
      5. 9.3.5  Switching Frequency (RT)
      6. 9.3.6  Clock Synchronization (DEMB)
      7. 9.3.7  Synchronization Out (SYNCOUT)
      8. 9.3.8  Spread Spectrum Frequency Modulation (DITH)
      9. 9.3.9  Configurable Soft Start (SS1, SS2)
      10. 9.3.10 Output Voltage Setpoint (FB1, FB2)
      11. 9.3.11 Minimum Controllable On Time
      12. 9.3.12 Error Amplifier and PWM Comparator (FB1, FB2, COMP1, COMP2)
      13. 9.3.13 Slope Compensation
      14. 9.3.14 Inductor Current Sense (CS1, VOUT1, CS2, VOUT2)
        1. 9.3.14.1 Shunt Current Sensing
        2. 9.3.14.2 Inductor DCR Current Sensing
      15. 9.3.15 Hiccup Mode Current Limiting (RES)
      16. 9.3.16 High-Side and Low-Side Gate Drivers (HO1/2, LO1/2, HOL1/2, LOL1/2)
      17. 9.3.17 Output Configurations (MODE, FB2)
        1. 9.3.17.1 Independent Dual-Output Operation
        2. 9.3.17.2 Single-Output Interleaved Operation
        3. 9.3.17.3 Single-Output Multiphase Operation
    4. 9.4 Device Functional Modes
      1. 9.4.1 Standby Modes
      2. 9.4.2 Diode Emulation Mode
      3. 9.4.3 Thermal Shutdown
  10. 10Application and Implementation
    1. 10.1 Application Information
      1. 10.1.1 Power Train Components
        1. 10.1.1.1 Buck Inductor
        2. 10.1.1.2 Output Capacitors
        3. 10.1.1.3 Input Capacitors
        4. 10.1.1.4 Power MOSFETs
        5. 10.1.1.5 EMI Filter
      2. 10.1.2 Error Amplifier and Compensation
    2. 10.2 Typical Applications
      1. 10.2.1 Design 1 – 5-V and 3.3-V Dual-Output Buck Regulator for Computing Applications
        1. 10.2.1.1 Design Requirements
        2. 10.2.1.2 Detailed Design Procedure
          1. 10.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 10.2.1.2.2 Custom Design With Excel Quickstart Tool
          3. 10.2.1.2.3 Inductor Calculation
          4. 10.2.1.2.4 Current-Sense Resistance
          5. 10.2.1.2.5 Output Capacitors
          6. 10.2.1.2.6 Input Capacitors
          7. 10.2.1.2.7 Compensation Components
        3. 10.2.1.3 Application Curves
      2. 10.2.2 Design 2 – Two-Phase, 15-A, 2.1-MHz Single-Output Buck Regulator for Server Applications
        1. 10.2.2.1 Design Requirements
        2. 10.2.2.2 Detailed Design Procedure
        3. 10.2.2.3 Application Curves
      3. 10.2.3 Design 3 – Two-Phase, 50-A, 300-kHz Single-Output Buck Regulator for ASIC Power Applications
        1. 10.2.3.1 Design Requirements
        2. 10.2.3.2 Detailed Design Procedure
        3. 10.2.3.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Power Stage Layout
      2. 12.1.2 Gate-Drive Layout
      3. 12.1.3 PWM Controller Layout
      4. 12.1.4 Thermal Design and Layout
      5. 12.1.5 Ground Plane Design
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Device Support
      1. 13.1.1 Third-Party Products Disclaimer
      2. 13.1.2 Development Support
        1. 13.1.2.1 Custom Design With WEBENCH® Tools
    2. 13.2 Documentation Support
      1. 13.2.1 Related Documentation
        1. 13.2.1.1 PCB Layout Resources
        2. 13.2.1.2 Thermal Design Resources
    3. 13.3 Receiving Notification of Documentation Updates
    4. 13.4 Support Resources
    5. 13.5 Trademarks
    6. 13.6 Electrostatic Discharge Caution
    7. 13.7 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.7 Typical Characteristics

VIN = VEN1 = VEN2 = 12 V, TJ = 25°C, unless otherwise stated

GUID-73448E55-F720-4A06-99D9-607827BAFF25-low.gif
See Figure 10-4.VOUT = 5 VFSW = 2.1 MHz
Figure 8-1 Efficiency Versus Load
GUID-BCEB7450-98E6-4F7E-83EA-FEE35C2ECEDA-low.gifFigure 8-3 Switch Node Voltages
GUID-2E43799C-E0E1-4A7D-8B67-4EFCC0F393DF-low.gifFigure 8-5 Load Transient Response
GUID-A727B4B0-E5C5-46C7-B578-7628B705783A-low.gif
VEN1 = VEN2 = 0 V
Figure 8-7 Shutdown Current Versus Input Voltage
GUID-5E4E1453-2C84-48B6-A51E-B7189CD0DF7A-low.gifFigure 8-9 ULIQ Mode Standby Current Versus Temperature
GUID-C5AD6EA5-3076-496A-BB80-B0440FEB10C0-low.gifFigure 8-11 Fixed 5-V Output Voltage (VOUT1) Versus Temperature
GUID-F0B8F1B4-21E5-4AD7-96EE-C04C6E7636F0-low.gifFigure 8-13 PG UV Thresholds Versus Temperature
GUID-DB55DC8F-53F1-4507-8842-F79DCAC47F77-low.gifFigure 8-15 VCC Regulation Voltage Versus Temperature
GUID-3549A06A-833F-4075-A0F0-F7C8E80BAC7B-low.gifFigure 8-17 VCC Current Limit Versus Temperature
GUID-3283A7EF-850E-4281-8235-470C3C0662DD-low.gifFigure 8-19 VDDA UVLO Thresholds Versus Temperature
GUID-065589B9-1C76-4B18-ACAA-79BD65D7D3C6-low.gifFigure 8-21 VCCX Switch Resistance Versus Temperature
GUID-2D8021A2-3B85-4CC4-9F3D-B56C04037871-low.gifFigure 8-23 Current Sense (CS1) Amplifier Gain Versus Temperature
GUID-3C445573-B48D-4DCD-B8B0-59BDB455E268-low.gifFigure 8-25 BOOT (HB1) UVLO Thresholds Versus Temperature
GUID-7AB7F717-CD22-415D-92CA-47EB94707116-low.gifFigure 8-27 RT Resistance Versus Switching Frequency
GUID-48141EA4-3177-4EFD-95EC-C6CECAFB8526-low.gif
See Figure 10-4.VOUT = 3.3 VFSW = 2.1 MHz
Figure 8-2 Efficiency Versus Load
GUID-0608BA9C-E4C7-4928-BE26-C2968DE8C29E-low.gifFigure 8-4 Start-Up Characteristic
GUID-1F0BAB5B-E800-4E21-9190-ADBC35F98949-low.gif
VEN1 = VEN2 = 0 V
Figure 8-6 Shutdown Current Versus Temperature
GUID-D79CB201-5423-4093-81EA-8B4AA155B946-low.gif
VEN2 = 0 V
Figure 8-8 Channel 1 Standby Current Versus Temperature
GUID-EE511190-C2C0-420C-BC07-8756AAFED7E4-low.gifFigure 8-10 Fixed 3.3-V Output Voltage (VOUT1) Versus Temperature
GUID-3B4650F5-AC1F-4096-ACB1-82716FE681E1-low.gifFigure 8-12 Feedback Voltage Versus Temperature
GUID-92968645-9E8A-4CAD-9585-D866B577C24B-low.gifFigure 8-14 PG OV Thresholds Versus Temperature
GUID-E62B2B6B-1B1C-47B5-92F2-67CE55B871A4-low.gifFigure 8-16 VCC UVLO Thresholds Versus Temperature
GUID-C551048B-3EDB-423C-88CB-679104EC5ECA-low.gifFigure 8-18 VDDA Regulation Voltage Versus Temperature
GUID-BC3404D9-4B75-428F-BC4B-97F17FBDD1AC-low.gifFigure 8-20 VCCX On/Off Thresholds Versus Temperature
GUID-C4045119-29BB-4DB4-B45B-5F72EFEA2D87-low.gifFigure 8-22 Current Sense (CS1) Threshold Versus Temperature
GUID-EDC255F8-5C65-44DD-A9C9-5496F77D5692-low.gifFigure 8-24 Minimum On Time and Off Time (HO1) Versus Temperature
GUID-0015002F-D0E9-4BB3-BD84-DA6E0032BE3B-low.gifFigure 8-26 Soft-Start (SS1) Current Versus Temperature