SNVSAN3F August   2017  – November 2020 LMR33630

PRODUCTION DATA  

  1.   1
  2. 1 Features
  3. 2 Applications
  4. 3 Description
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 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 System Characteristics
    8. 7.8 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1 Power-Good Flag Output
      2. 8.3.2 Enable and Start-up
      3. 8.3.3 Current Limit and Short Circuit
      4. 8.3.4 Undervoltage Lockout and Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Auto Mode
      2. 8.4.2 Dropout
      3. 8.4.3 Minimum Switch On-Time
  10. 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  Custom Design With WEBENCH® Tools
        2. 9.2.2.2  Choosing the Switching Frequency
        3. 9.2.2.3  Setting the Output Voltage
        4. 9.2.2.4  Inductor Selection
        5. 9.2.2.5  Output Capacitor Selection
        6. 9.2.2.6  Input Capacitor Selection
        7. 9.2.2.7  CBOOT
        8. 9.2.2.8  VCC
        9. 9.2.2.9  CFF Selection
        10. 9.2.2.10 External UVLO
        11. 9.2.2.11 Maximum Ambient Temperature
      3. 9.2.3 Application Curves
    3. 9.3 What to Do and What Not to Do
  11.   Power Supply Recommendations
  12. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Ground and Thermal Considerations
    2. 10.2 Layout Example
  13. 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 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 Glossary
  14. 12Mechanical, Packaging, and Orderable Information
    1. 12.1 Tape and Reel Information

Package Options

Refer to the PDF data sheet for device specific package drawings

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

9.2.3 Application Curves

Unless otherwise specified the following conditions apply: VIN = 12 V, TA = 25°C. The circuit is shown in Figure 9-31, with the appropriate BOM from Table 9-3 or Table 9-4.

LMR33630 Efficiency
VOUT = 5 V400 kHzDDA Package
Figure 9-7 Efficiency
LMR33630 Efficiency
VOUT = 5 V1.4 MHzDDA Package
Figure 9-9 Efficiency
LMR33630 Efficiency
VOUT = 5 V 2.1 MHz DDA Package
Figure 9-11 Efficiency
LMR33630 Efficiency
VOUT = 5 V 400 kHz RNX Package
Figure 9-13 Efficiency
LMR33630 Efficiency
VOUT = 5 V 1.4 MHz RNX Package
Figure 9-15 Efficiency
LMR33630 Efficiency
VOUT = 5 V 2.1 MHz RNX Package
Figure 9-17 Efficiency
LMR33630 Line and Load Regulation
VOUT = 5 V
Figure 9-19 Line and Load Regulation
LMR33630 Mode Change Thresholds
VOUT = 5 V ƒSW = 400 kHz
Figure 9-21 Mode Change Thresholds
LMR33630 Load Transient
VIN = 12 V VOUT = 5 V
tf = tr = 2 µs IOUT = 0 A to 3 A
Figure 9-23 Load Transient
LMR33630 Line and Load Regulation
VOUT = 3.3 V
Figure 9-25 Line and Load Regulation
LMR33630 Mode Change Thresholds
VOUT = 3.3 V ƒSW = 400 kHz
Figure 9-27 Mode Change Thresholds
LMR33630 Load Transient
VIN = 12 V VOUT = 3.3 V
tf = tr = 2 µs IOUT = 0 A to 3 A
Figure 9-29 Load Transient
LMR33630 Efficiency
VOUT = 3.3 V400 kHzDDA Package
Figure 9-8 Efficiency
LMR33630 Efficiency
VOUT = 3.3 V1.4 MHzDDA Package
Figure 9-10 Efficiency
LMR33630 Efficiency
VOUT = 3.3 V 2.1 MHz DDA Package
Figure 9-12 Efficiency
LMR33630 Efficiency
VOUT = 3.3 V 400 kHz RNX Package
Figure 9-14 Efficiency
LMR33630 Efficiency
VOUT = 3.3 V 1.4 MHz RNX Package
Figure 9-16 Efficiency
LMR33630 Efficiency
VOUT = 3.3 V 2.1 MHz RNX Package
Figure 9-18 Efficiency
LMR33630 Input Supply Current
VOUT = 5 V IOUT = 0 A RFBT = 1 MΩ
Figure 9-20 Input Supply Current
LMR33630 Switching Frequency versus Output Current
VOUT = 5 V ƒSW = 400 kHz
Figure 9-22 Switching Frequency versus Output Current
LMR33630 Load Transient
VIN = 12 V VOUT = 5 V
tf = tr = 2 µs IOUT = 1 A to 3 A
Figure 9-24 Load Transient
LMR33630 Input Supply Current
VOUT = 3.3 V IOUT = 0 A RFBT = 1 MΩ
Figure 9-26 Input Supply Current
LMR33630 Switching Frequency versus Output Current
VOUT = 3.3 V ƒSW = 400 kHz
Figure 9-28 Switching Frequency versus Output Current
LMR33630 Load Transient
VIN = 12 V VOUT = 3.3V IOUT = 1 A to 3 A
tf = tr = 2 µs
Figure 9-30 Load Transient
LMR33630 Circuit for Application CurvesFigure 9-31 Circuit for Application Curves

The values in this table were selected to enhance certain performance criteria and may not represent typical values.

Table 9-3 BOM for Typical Application Curves DDA Package
VOUTFREQUENCYRFBBCOUTCIN + CHFLU1
3.3 V400 kHz43.3 kΩ4 × 22 µF1 × 10 µF + 1 × 220 nF6.8 µH, 14 mΩ LMR33630ADDA
3.3 V1400 KHz43.3 kΩ4 × 22 µF1 × 10 µF + 1 × 220 nF2.2 µH, 11.4 mΩLMR33630BDDA
3.3 V2100 kHz43.3 kΩ4 × 22 µF1 × 10 µF + 1 × 220 nF1.2 µH, 16 mΩLMR33630CDDA
5 V400 kHz24.9 kΩ4 × 22 µF1 × 10 µF + 1 × 220 nF8 µH, 14 mΩ LMR33630ADDA
5 V1400 KHz24.9 kΩ4 × 22 µF1 × 10 µF + 1 × 220 nF2.2 µH, 11.4 mΩLMR33630BDDA
5 V2100 kHz24.9 kΩ4 × 22 µF1 × 10 µF + 1 × 220 nF1.5 µH, 8.2 mΩLMR33630CDDA
Table 9-4 BOM for Typical Application Curves RNX Package
VOUTFREQUENCYRFBBCOUTCIN + CHFLU1
3.3 V400 kHz43.3 kΩ4 × 22 µF2 × 4.7 µF + 2 × 100 nF6.8 µH, 14 mΩ LMR33630ARNX
3.3 V1400 KHz43.3 kΩ4 × 22 µF2 × 4.7 µF + 2 × 100 nF2.2 µH, 11.4 mΩLMR33630BRNX
3.3 V2100 kHz43.3 kΩ4 × 22 µF2 × 4.7 µF + 2 × 100 nF1.2 µH, 7 mΩLMR33630CRNX
5 V400 kHz24.9 kΩ4 × 22 µF2 × 4.7 µF + 2 × 100 nF8 µH, 25 mΩ LMR33630ARNX
5 V1400 KHz24.9 kΩ4 × 22 µF2 × 4.7 µF + 2 × 100 nF2.2 µH, 11.4 mΩLMR33630BRNX
5 V2100 kHz24.9 kΩ4 × 22 µF2 × 4.7 µF + 2 × 100 nF1.5 µH, 8.2 mΩ LMR33630CRNX