SNVSAH3E February   2018  – July 2020 LMR23625

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  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 Switching Characteristics
    8. 6.8 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 Fixed-Frequency Peak-Current-Mode Control
      2. 7.3.2 Adjustable Output Voltage
      3. 7.3.3 Enable/Sync
      4. 7.3.4 VCC, UVLO
      5. 7.3.5 Minimum ON-time, Minimum OFF-time and Frequency Foldback at Drop-out Conditions
      6. 7.3.6 Internal Compensation and CFF
      7. 7.3.7 Bootstrap Voltage (BOOT)
      8. 7.3.8 Overcurrent and Short-Circuit Protection
      9. 7.3.9 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Active Mode
      3. 7.4.3 CCM Mode
      4. 7.4.4 Light Load Operation (PFM Option)
      5. 7.4.5 Light Load Operation (FPWM Option)
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      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  Output Voltage Setpoint
        3. 8.2.2.3  Switching Frequency
        4. 8.2.2.4  Inductor Selection
        5. 8.2.2.5  Output Capacitor Selection
        6. 8.2.2.6  Feed-forward Capacitor
        7. 8.2.2.7  Input Capacitor Selection
        8. 8.2.2.8  Bootstrap Capacitor Selection
        9. 8.2.2.9  VCC Capacitor Selection
        10. 8.2.2.10 Undervoltage Lockout Set-Point
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Compact Layout for EMI Reduction
    4. 10.4 Ground Plane and Thermal Considerations
    5. 10.5 Feedback Resistors
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Support Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • DDA|8
  • DRR|12
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.3 Application Curves

Unless otherwise specified the following conditions apply: VIN = 12 V, fSW = 2100 kHz, L = 2.2 µH, COUT = 47 µF, TA = 25 °C.
Unless otherwise specified the following conditions apply: VIN = 12 V, fSW = 2100 kHz, L = 2.2 µH, COUT = 47 µF, TA = 25 °C.GUID-78AB64F5-9784-48AC-A5DE-7DDB722BF538-low.png
VOUT = 5 V IOUT = 2.5 A fSW = 2100 kHz
Figure 8-2 CCM Mode. Unless otherwise specified the following conditions apply: VIN = 12 V, fSW = 2100 kHz, L = 2.2 µH, COUT = 47 µF, TA = 25 °C.
GUID-599AC7FE-69DA-43FC-BEEE-D40B20C382AE-low.png
VOUT = 5 V IOUT = 0 mA fSW = 2100 kHz
Figure 8-4 PFM Mode
GUID-381F26FD-348B-487E-9B30-A37A3A252D35-low.png
VIN = 12 V VOUT = 5 V IOUT = 2 A
Figure 8-6 Start-Up by VIN
GUID-4733BB59-ADE1-434D-B23F-3EA61ED9012C-low.png
VIN = 12 V IOUT = 0.2 A to 2.5 A, 100 mA / μs
VOUT = 5 V
Figure 8-8 Load Transient
GUID-FA47528E-A16B-4EB7-8279-4B15FCD8F42A-low.png
VOUT = 5 V IOUT = 1 A to short
Figure 8-10 Short Protection
GUID-476D14B1-64E5-46A7-85D9-10F7929A93EB-low.png
VOUT = 5 V IOUT = 100 mA fSW = 2100 kHz
Figure 8-3 DCM Mode
GUID-DDDE9243-60B1-49D3-BB07-758DAA36DCC5-low.png
VOUT = 5 V IOUT = 0 mA fSW = 2100 kHz
Figure 8-5 FPWM Mode
GUID-82E58E45-6960-4AAA-B45B-D574BFD37515-low.png
VIN = 12 V VOUT = 5 V IOUT = 2 A
Figure 8-7 Start-Up by EN
GUID-CF67B505-2492-49FE-9ACC-C650B3060CCD-low.png
VOUT = 5 V VIN = 7 V to 36 V, 2 V / μs
IOUT = 2.5 A
Figure 8-9 Line Transient
GUID-CB9504AA-62D1-436E-AE3A-04257E4C6E91-low.png
VOUT = 5 V IOUT = short to 1 A
Figure 8-11 Short Recovery