SNVSBK9F November   2019  – September 2024 LM63635-Q1

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 Timing Characteristics
    7. 6.7 Switching Characteristics
    8. 6.8 System Characteristics
    9. 6.9 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 Sync/Mode Selection
      2. 7.3.2 Output Voltage Selection
      3. 7.3.3 Switching Frequency Selection
        1. 7.3.3.1 Spread Spectrum Option
      4. 7.3.4 Enable and Start-Up
      5. 7.3.5 RESET Flag Output
      6. 7.3.6 Undervoltage Lockout and Thermal Shutdown and Output Discharge
    4. 7.4 Device Functional Modes
      1. 7.4.1 Overview
      2. 7.4.2 Light Load Operation
        1. 7.4.2.1 Sync/FPWM Operation
      3. 7.4.3 Dropout Operation
      4. 7.4.4 Minimum On-time Operation
      5. 7.4.5 Current Limit and Short-Circuit Operation
  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 Choosing the Switching Frequency
        2. 8.2.2.2 Setting the Output Voltage
          1. 8.2.2.2.1 CFF Selection
        3. 8.2.2.3 Inductor Selection
        4. 8.2.2.4 Output Capacitor Selection
        5. 8.2.2.5 Input Capacitor Selection
        6. 8.2.2.6 CBOOT
        7. 8.2.2.7 VCC
        8. 8.2.2.8 External UVLO
        9. 8.2.2.9 Maximum Ambient Temperature
      3. 8.2.3 Full Feature Design Example
      4. 8.2.4 Application Curves
      5. 8.2.5 EMI Performance 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 Device Nomenclature
    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
    1. 11.1 Tape and Reel Information

Package Options

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

8.2.4 Application Curves

Unless otherwise specified, the following conditions apply: VIN = 13.5 V, TA = 25°C. Table 8-3 shows the circuit with the appropriate BOM from Figure 8-26.

LM63635-Q1 Efficiency
VOUT = 5 VƒSW = 2100 kHz (AUTO)
Figure 8-8 Efficiency
LM63635-Q1 Efficiency
VOUT = 5 V ƒSW = 400 kHz (AUTO)
Figure 8-10 Efficiency
LM63635-Q1 Line and Load Regulation
VOUT = 5 V ƒSW = 2100 kHz (AUTO)
Figure 8-12 Line and Load Regulation
LM63635-Q1 Switching Frequency versus Output Current
VIN = 13.5 V ƒSW = 2100 kHz (AUTO)
Figure 8-14 Switching Frequency versus Output Current
LM63635-Q1 Dropout Voltage versus Output Current for -1% Drop
VOUT = 5 V
Figure 8-16 Dropout Voltage versus Output Current for -1% Drop
LM63635-Q1 Input Supply Current versus Output Current
VOUT = 5 V
Figure 8-18 Input Supply Current versus Output Current
LM63635-Q1 Load Transient
0 A to 3.25 A, 2 µs VOUT = 5 V ƒSW = 400 kHz
Figure 8-20 Load Transient
LM63635-Q1 Load Transient
0 A to 3.25 A, 2 µs VOUT = 5 V ƒSW = 2100 kHz
Figure 8-22 Load Transient
LM63635-Q1 Load Transient
VOUT = 5 V ƒSW = 400 kHz
AUTO 1 A to 3.25 A, 2 µs
Figure 8-24 Load Transient
LM63635-Q1 Efficiency
VOUT = 3.3 V ƒSW = 2100 kHz (AUTO)
Figure 8-9 Efficiency
LM63635-Q1 Efficiency
VOUT = 3.3 V ƒSW = 400 kHz (AUTO)
Figure 8-11 Efficiency
LM63635-Q1 Line and Load Regulation
VOUT = 3.3 V ƒSW = 2100 kHz (AUTO)
Figure 8-13 Line and Load Regulation
LM63635-Q1 Switching Frequency vs Input Voltage
VOUT = 3.3 V ƒSW = 2100 kHz (FPWM)
Figure 8-15 Switching Frequency vs Input Voltage
LM63635-Q1 Dropout Voltage versus Output Current to 1.85 MHz
VOUT = 5 V
Figure 8-17 Dropout Voltage versus Output Current to 1.85 MHz
LM63635-Q1 Input Supply Current versus Output Current
VOUT = 3.3 V
Figure 8-19 Input Supply Current versus Output Current
LM63635-Q1 Load Transient
0 A to 3.25 A, 2 µs VOUT = 3.3 V ƒSW = 400 kHz
Figure 8-21 Load Transient
LM63635-Q1 Load Transient
0 A to 3.25 A, 2 µs VOUT = 3.3 V ƒSW = 2100 kHz
Figure 8-23 Load Transient
LM63635-Q1 Load Transient
VOUT = 3.3 V ƒSW = 400 kHz
AUTO 1 A to 3.25 A, 2 µs
Figure 8-25 Load Transient
LM63635-Q1 Circuit for Typical Application Curves Figure 8-26 Circuit for Typical Application Curves
Table 8-3 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 LM63635D
3.3 V 2100 kHz 3.25 A 3 × 22 µF 1.5 µH, 10 mΩ LM63635D
5 V 400 kHz 3.25 A 3 × 22 µF 6.8 µH, 22 mΩ LM63635D
5 V 2100 kHz 3.25 A 3 × 22 µF 1.5 µH, 10 mΩ LM63635D
(1) The values in this table were selected to enhance certain performance criteria and may not represent typical values.