SNVSBK9C November   2019  – September 2020 LM63635-Q1

PRODUCTION DATA  

  1. Features
  2. Applications
  3. Description
  4. Revision History
  5. Device Comparison Table
  6. Pin Configuration and Functions
    1.     Pin Functions
  7. Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 Timing Characteristics
    7. 7.7 Switching Characteristics
    8. 7.8 System Characteristics
    9. 7.9 Typical Characteristics
  8. Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Sync/Mode Selection
      2. 8.3.2 Output Voltage Selection
      3. 8.3.3 Switching Frequency Selection
        1. 8.3.3.1 Spread Spectrum Option
      4. 8.3.4 Enable and Start-up
      5. 8.3.5 RESET Flag Output
      6. 8.3.6 Undervoltage Lockout and Thermal Shutdown and Output Discharge
    4. 8.4 Device Functional Modes
      1. 8.4.1 Overview
      2. 8.4.2 Light Load Operation
        1. 8.4.2.1 Sync/FPWM Operation
      3. 8.4.3 Dropout Operation
      4. 8.4.4 Minimum On-time Operation
      5. 8.4.5 Current Limit and Short-Circuit Operation
  9. Application and Implementation
    1. 9.1 Application Information
    2. 9.2 Typical Application
      1. 9.2.1 Design Requirements
      2. 9.2.2 Detailed Design Procedure
        1. 9.2.2.1 Choosing the Switching Frequency
        2. 9.2.2.2 Setting the Output Voltage
          1. 9.2.2.2.1 CFF Selection
        3. 9.2.2.3 Inductor Selection
        4. 9.2.2.4 Output Capacitor Selection
        5. 9.2.2.5 Input Capacitor Selection
        6. 9.2.2.6 CBOOT
        7. 9.2.2.7 VCC
        8. 9.2.2.8 External UVLO
        9. 9.2.2.9 Maximum Ambient Temperature
      3. 9.2.3 Full Feature Design Example
      4. 9.2.4 Application Curves
      5. 9.2.5 EMI Performance Curves
    3. 9.3 What to Do and What Not to Do
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Ground and Thermal Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Glossary
    6. 12.6 Electrostatic Discharge Caution
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

Application Curves

GUID-B613DC2A-3044-46EE-85DA-1D7F8811FE51-low.gif
VOUT = 5 VƒSW = 2100 kHz (AUTO)
Figure 9-8 Efficiency
GUID-2FA5E641-1F3A-4ED3-90CB-96686C7807D2-low.gif
VOUT = 5 V ƒSW = 400 kHz (AUTO)
Figure 9-10 Efficiency
GUID-09DAAEBA-9959-410A-97EB-958D88CD3CE7-low.gif
VOUT = 5 V ƒSW = 2100 kHz (AUTO)
Figure 9-12 Line and Load Regulation
GUID-BDF1B561-8A0F-4310-B638-27AF35A45057-low.gif
VOUT = 3.3 V ƒSW = 2100 kHz (AUTO)
Figure 9-9 Efficiency
GUID-ED2284C8-AA01-4C26-AC1D-6E107E46B051-low.gif
VOUT = 3.3 V ƒSW = 400 kHz (AUTO)
Figure 9-11 Efficiency
GUID-141E5912-0493-4B60-A67D-769825B19BC4-low.gif
VOUT = 3.3 V ƒSW = 2100 kHz (AUTO)
Figure 9-13 Line and Load Regulation
GUID-E8E6B32B-1E0A-4DB7-B7B1-64B968DE7BB5-low.gif
VIN = 13.5 VƒSW = 2100 kHz (AUTO)
Figure 9-14 Switching Frequency versus Output Current
GUID-D81C8A72-42F7-4A9C-B0FE-33C8189DA3DE-low.gif
VOUT = 5 V
Figure 9-16 Dropout Voltage versus Output Current for -1% Drop
GUID-E28BF272-A681-4E42-9C25-23BDCCB4F596-low.gif
VOUT = 5 V
Figure 9-18 Input Supply Current versus Output Current
GUID-D28CDEB9-BBCA-4383-B601-39462AA45B7F-low.gif
VOUT = 3.3 VƒSW = 2100 kHz (AUTO)
Figure 9-15 Switching Frequency vs Input Voltage
GUID-12ED4B29-1668-4F72-B314-AD4E63F23FB2-low.gif
VOUT = 5 V
Figure 9-17 Dropout Voltage versus Output Current to 1.85 MHz
GUID-80EC5F17-CBF1-4B44-A158-B0E577A3B3CE-low.gif
VOUT = 3.3 V
Figure 9-19 Input Supply Current versus Output Current
GUID-CF66C723-D076-46DD-A802-8F683D1DAEC4-low.gif
0 A to 3.25 A, 2 µsVOUT = 5 VƒSW = 400 kHz
Figure 9-20 Load Transient
GUID-9ED21B65-64BD-4011-8F96-64D14FA86921-low.gif
0 A to 3.25 A, 2 µs VOUT = 5 V ƒSW = 2100 kHz
Figure 9-22 Load Transient
GUID-DE12B7F3-9DFA-4AC0-B02A-9EB063C2B2AB-low.gif
VOUT = 5 V ƒSW = 400 kHz
AUTO 1 A to 3.25 A, 2 µs
Figure 9-24 Load Transient
GUID-3E547B2C-0136-4E5A-9460-9F15DC7A7164-low.gif
0 A to 3.25 A, 2 µsVOUT = 3.3 VƒSW = 400 kHz
Figure 9-21 Load Transient
GUID-739927C6-A78F-48E5-9B0A-F9AC8FDFD0FB-low.gif
0 A to 3.25 A, 2 µs VOUT = 3.3 V ƒSW = 2100 kHz
Figure 9-23 Load Transient
GUID-17BB9D9A-F5B3-4D02-B102-8358AF4D11FC-low.gif
VOUT = 3.3 V ƒSW = 400 kHz
AUTO 1 A to 3.25 A, 2 µs
Figure 9-25 Load Transient
GUID-B0801334-3F79-40FB-9D50-7DD7F0BC5470-low.gif Figure 9-26 Circuit for Typical Application Curves
Table 9-3 BOM for Typical Application Curves
VOUT(1) FREQUENCY OUTPUT CURRENT COUT L U1
3.3 V 400 kHz 3.25 A 3 × 22 µF 6.8 µH, 22 mΩ LM63635
3.3 V 2100 kHz 3.25 A 3 × 22 µF 1.5 µH, 10 mΩ LM63635
5 V 400 kHz 3.25 A 3 × 22 µF 6.8 µH, 22 mΩ LM63635
5 V 2100 kHz 3.25 A 3 × 22 µF 1.5 µH, 10 mΩ LM63635
The values in this table were selected to enhance certain performance criteria and may not represent typical values.