SNVSAV8B June   2017  – August 2020 LMR23615

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 Characteristics
    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 Frequency
      3. 7.3.3  Adjustable Output Voltage
      4. 7.3.4  Enable/Sync
      5. 7.3.5  VCC, UVLO
      6. 7.3.6  Minimum ON-Time, Minimum-OFF Time, and Frequency Foldback at Dropout Conditions
      7. 7.3.7  Internal Compensation and CFF
      8. 7.3.8  Bootstrap Voltage (BOOT)
      9. 7.3.9  Overcurrent and Short-Circuit Protection
      10. 7.3.10 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
  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  Feedforward 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 Setpoint
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Compact Layout for EMI Reduction
      2. 10.1.2 Ground Plane and Thermal Considerations
      3. 10.1.3 Feedback Resistors
    2. 10.2 Layout Example
  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

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

6.8 Typical Characteristics

Unless otherwise specified the following conditions apply: VIN = 12 V, fSW = 1600 kHz, L = 4.7 µH, COUT = 47 µF, TA = 25 °C.

GUID-77E1E0B5-3235-43F3-AE6C-F94F9F00B74C-low.gif
fSW = 1000 kHz VOUT = 5 V
Figure 6-1 Efficiency vs Load Current
GUID-595D2768-D526-4DF9-B811-BCEEAB334EF1-low.gif
fSW = 2200 kHz VOUT = 5 V
Figure 6-3 Efficiency vs Load Current
GUID-77B6CED0-8DDD-4B6E-9F63-7FBFE8F85173-low.gif
fSW = 1000 kHz VOUT = 5 V
Figure 6-5 Load Regulation
GUID-9C79A53B-C905-418B-9D9A-89FAA49B670B-low.gif
fSW = 1000 kHz VOUT = 5 V
Figure 6-7 Dropout Curve
GUID-2D144DC2-E4C1-454C-B8CF-D24DC411ED39-low.gif
VIN = 12 V VFB = 1.1 V
Figure 6-9 IQ vs Junction Temperature
GUID-0D46E0DF-09F6-4DA4-9FFB-2718ACBB355C-low.gif
Figure 6-11 VIN UVLO Hysteresis vs Junction Temperature
GUID-5F796552-0165-4DB6-B040-49EAE58D4FAD-low.gif
fSW = 1000 kHz VOUT = 3.3 V
Figure 6-2 Efficiency vs Load Current
GUID-9FED1F32-8345-496C-8894-A5132957B400-low.gif
fSW = 2200 kHz (Sync) VOUT = 3.3 V
Figure 6-4 Efficiency vs Load Current
GUID-661C648C-F44E-4630-89DD-5E0532195BA8-low.gif
fSW = 1000 kHz VOUT = 5 V
Figure 6-6 Line Regulation
GUID-C2F08AAF-ACEB-407C-8830-03C8EAD692BF-low.gif
fSW = 2200 kHz VOUT = 5 V
Figure 6-8 Dropout Curve
GUID-B69FEB03-B44C-4641-B251-BF66D27D2F02-low.gif
 
Figure 6-10 VIN UVLO Rising Threshold vs Junction Temperature
GUID-A519CCC8-D4EE-4547-8095-62F773C2109A-low.gif
VIN = 12 V
Figure 6-12 HS and LS Current Limit vs Junction Temperature