SNVSCH7 February   2024 LMR38025

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Device Comparison Table
  6. 5 Pin Configuration and Functions
  7. 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 System Characteristics
    7. 6.7 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Fixed Frequency Peak Current Mode Control
      2. 7.3.2  Adjustable Output Voltage
      3. 7.3.3  Enable
      4. 7.3.4  Switching Frequency and Synchronization (RT/SYNC)
      5. 7.3.5  Power-Good Flag Output
      6. 7.3.6  Minimum On Time, Minimum Off Time, and Frequency Foldback
      7. 7.3.7  Bootstrap Voltage
      8. 7.3.8  Overcurrent and Short-Circuit Protection
      9. 7.3.9  Soft Start
      10. 7.3.10 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Auto Mode
      2. 7.4.2 Forced PWM Operation
      3. 7.4.3 Dropout
      4. 7.4.4 Minimum Switch On Time
  9. 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 Custom Design With WEBENCH® Tools
        2. 8.2.2.2 Choosing the Switching Frequency
        3. 8.2.2.3 FB for Adjustable Output
        4. 8.2.2.4 Inductor Selection
        5. 8.2.2.5 Output Capacitor Selection
        6. 8.2.2.6 Input Capacitor Selection
        7. 8.2.2.7 CBOOT
        8. 8.2.2.8 External UVLO
        9. 8.2.2.9 Maximum Ambient Temperature
      3. 8.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Ground and Thermal Considerations
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
    3. 9.3 Receiving Notification of Documentation Updates
    4. 9.4 Support Resources
    5. 9.5 Trademarks
    6. 9.6 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8.2.3 Application Curves

Unless otherwise specified the following conditions apply: VIN = 48V, L = 12µH , TA = 25°C.

GUID-20230929-SS0I-SZLC-VGXR-CP8JCTKGNFT9-low.svg

12 V

LMR38025		 VOUT = 5V 400kHz

2.0ms/DIV

Figure 8-3 Start-Up by VIN
GUID-20230929-SS0I-12ND-HNJR-0FXSDWTDW5VN-low.svg
LMR38025 VOUT = 5V

AC Coupled

 No Load

8.0ms/DIV

Figure 8-5 PFM Switching
GUID-20230929-SS0I-WJB1-LNKS-8F1LZX1P2MGC-low.svg
LMR38025 VOUT = 5V 2.5A to Short

40ms/DIV

Figure 8-7 Short Circuit Applied
GUID-20230929-SS0I-M5FP-JRSH-VLQD0GHPVQDD-low.svg
LMR38025 VOUT = 5V No Load

4.0ms/DIV

Figure 8-9 Start-Up With Prebias
GUID-20230929-SS0I-KTTQ-GJNJ-T0FWZRGFX1DZ-low.svg
LMR38025(PFM) VOUT = 5V

(AC Coupled)

 400kHz,100µs/DIV
250mA to 2.25A at 200mA/µs
Figure 8-11 Load Transient
GUID-20240201-SS0I-9ZK2-R3LR-8GNXH4G0K7HV-low.svg
LMR38025 VOUT = 5V

PFM Version

 400kHz
Figure 8-13 5V Load Regulation
GUID-20230929-SS0I-2GBL-D5WM-JJGZJVHCJFGG-low.svg
LMR38025 VOUT = 5V 400kHz

2.0ms/DIV

Figure 8-4 Start-Up by EN
GUID-20230929-SS0I-CPK0-DZ6W-3CL7FJBH2X93-low.svg
LMR38025 VOUT = 5V

AC Coupled

 400kHz

1.0µs/DIV

Figure 8-6 Full Load Switching
GUID-20230929-SS0I-JXBX-LPTN-BCVN0Z3QDBMF-low.svg
LMR38025 VOUT = 5V Short Recovery

40ms/DIV

Figure 8-8 Short-Circuit Recovery
GUID-20230929-SS0I-KZTJ-TJRS-8DKLPSNTSRPQ-low.svg
LMR38025 VOUT = 5V 400kHz

2µs/DIV

Figure 8-10 Frequency Synchronization
GUID-20230929-SS0I-XQDW-VRZD-BGMSMGFFL0H7-low.svg
LMR38025(PFM) VOUT = 5V

(AC Coupled)

 400kHz

800µs/DIV

10V to 70V at 200V/ms
Figure 8-12 Line Transient
GUID-20240201-SS0I-JP7T-CRKW-4SFBJJVCXQ3N-low.svg
LMR38025 VOUT = 12V

PFM Version

 400kHz
Figure 8-14 12V Load Regulation
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