SNVSBE4C March   2020  – June 2021 LM61440-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Description (continued)
  6. 6 Device Comparison Table
  7. 7 Pin Configuration and Functions
  8. 8 Specifications
    1. 8.1 Absolute Maximum Ratings
    2. 8.2 ESD Ratings
    3. 8.3 Recommended Operating Conditions
    4. 8.4 Thermal Information
    5. 8.5 Electrical Characteristics
    6. 8.6 Timing Characteristics
    7. 8.7 Systems Characteristics
    8. 8.8 Typical Characteristics
  9. 9 Detailed Description
    1. 9.1 Overview
    2. 9.2 Functional Block Diagram
    3. 9.3 Feature Description
      1. 9.3.1  EN/SYNC Uses for Enable and VIN UVLO
      2. 9.3.2  EN/SYNC Pin Uses for Synchronization
      3. 9.3.3  Clock Locking
      4. 9.3.4  Adjustable Switching Frequency
      5. 9.3.5  PGOOD Output Operation
      6. 9.3.6  Internal LDO, VCC UVLO, and BIAS Input
      7. 9.3.7  Bootstrap Voltage and VCBOOT-UVLO (CBOOT Pin)
      8. 9.3.8  Adjustable SW Node Slew Rate
      9. 9.3.9  Spread Spectrum
      10. 9.3.10 Soft Start and Recovery From Dropout
      11. 9.3.11 Output Voltage Setting
      12. 9.3.12 Overcurrent and Short Circuit Protection
      13. 9.3.13 Thermal Shutdown
      14. 9.3.14 Input Supply Current
    4. 9.4 Device Functional Modes
      1. 9.4.1 Shutdown Mode
      2. 9.4.2 Standby Mode
      3. 9.4.3 Active Mode
        1. 9.4.3.1 CCM Mode
        2. 9.4.3.2 Auto Mode - Light Load Operation
          1. 9.4.3.2.1 Diode Emulation
          2. 9.4.3.2.2 Frequency Reduction
        3. 9.4.3.3 FPWM Mode - Light Load Operation
        4. 9.4.3.4 Minimum On-time (High Input Voltage) Operation
        5. 9.4.3.5 Dropout
  10. 10Application and Implementation
    1. 10.1 Application Information
    2. 10.2 Typical Application
      1. 10.2.1 Design Requirements
      2. 10.2.2 Detailed Design Procedure
        1. 10.2.2.1  Choosing the Switching Frequency
        2. 10.2.2.2  Setting the Output Voltage
        3. 10.2.2.3  Inductor Selection
        4. 10.2.2.4  Output Capacitor Selection
        5. 10.2.2.5  Input Capacitor Selection
        6. 10.2.2.6  BOOT Capacitor
        7. 10.2.2.7  BOOT Resistor
        8. 10.2.2.8  VCC
        9. 10.2.2.9  BIAS
        10. 10.2.2.10 CFF and RFF Selection
        11. 10.2.2.11 External UVLO
      3. 10.2.3 Application Curves
  11. 11Power Supply Recommendations
  12. 12Layout
    1. 12.1 Layout Guidelines
      1. 12.1.1 Ground and Thermal Considerations
    2. 12.2 Layout Example
  13. 13Device and Documentation Support
    1. 13.1 Documentation Support
      1. 13.1.1 Related Documentation
    2. 13.2 Receiving Notification of Documentation Updates
    3. 13.3 Support Resources
    4. 13.4 Trademarks
    5. 13.5 Electrostatic Discharge Caution
    6. 13.6 Glossary
  14. 14Mechanical, Packaging, and Orderable Information

Package Options

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

10.2.3 Application Curves

Unless otherwise specified, the following conditions apply: VIN = 13.5 V, TA = 25°C. The circuit is shown in Figure 10-1, with the appropriate BOM from Table 10-5.
Unless otherwise specified, the following conditions apply: VIN = 13.5 V, TA = 25°C. The circuit is shown in Figure 10-1, with the appropriate BOM from Table 10-5.GUID-C568F143-137F-495A-9A06-272580EE2DC5-low.gif
VOUT = 3.3 VFSW = 2100 kHzAUTO Mode
Figure 10-5 LM61440-Q1 Efficiency. Unless otherwise specified, the following conditions apply: VIN = 13.5 V, TA = 25°C. The circuit is shown in Figure 10-1, with the appropriate BOM from Table 10-5.
GUID-0E451E25-9E1C-458B-B5DD-DA62FBFEC683-low.gif
VOUT = 5 VFSW = 2100 kHzAUTO Mode
Figure 10-7 LM61440-Q1 Efficiency
GUID-570BEE7E-18C7-4C6F-9A88-7B56364BCA7B-low.gif
VOUT = 3.3 VFSW = 400 kHzAuto Mode
Figure 10-9 LM611440-Q1 Load and Line Regulation
GUID-34908425-B5CE-4B04-B738-B420D456B398-low.gif
VOUT = 3.3 VFSW = 2100 kHzAuto Mode
Figure 10-11 LM61440-Q1 Load and Line Regulation
GUID-AA7D8437-4844-4016-80C0-A4F8F140FFC1-low.gif
VOUT = 5VFSW = 400 kHzAuto Mode
Figure 10-13 LM61440-Q1 Load and Line Regulation
GUID-E7B8E9BD-61E6-4CEA-9588-548A3F7E4C51-low.gif
VOUT = 5VFSW = 2100 kHzAuto Mode
Figure 10-15 LM61440-Q1 Load and Line Regulation
GUID-6348A732-650D-4613-8718-B35561DAB77D-low.gif
VOUT = 3.3 VFSW = 400 kHzAUTO Mode
Figure 10-17 LM61440-Q1 Dropout Curve
GUID-52357CC7-8477-43DC-83F2-A709FBE06C10-low.gif
VOUT = 5 VFSW = 400 kHzAUTO Mode
Figure 10-19 LM61440-Q1 Dropout Curve
GUID-AB45343F-5B5E-457D-8D08-C2B960CCC70D-low.gif
VOUT = 3.3 VFSW = 400 kHzAUTO Mode
Figure 10-21 LM61440-Q1 Frequency Dropout Curve
GUID-AD5E6051-954C-493E-AA3B-4AB85AFC0FE6-low.gif
VOUT = 5 VFSW = 400 kHzAUTO Mode
Figure 10-23 LM61440-Q1 Frequency Dropout Curve
GUID-2C4AC070-93D5-4FF9-8F50-35E3C1F6753E-low.png
VOUT = 5 VFSW = 2100 kHzAUTO Mode
IOUT = 100 mAVIN = 13.5 V
Figure 10-25 LM61440-Q1 Switching Waveform and VOUT Ripple
GUID-9E9D786C-F960-4D10-BB12-023D05BF4D78-low.gif
VOUT = 3.3 VFSW = 2100 kHzFPWM Mode
IOUT = 3.25 AVIN = 13.5 V
Figure 10-27 LM61440-Q1 Start-up with 3.25-A
GUID-96E992B8-9048-4502-943C-B0D90BCA3E7C-low.gif
VOUT = 5 VFSW = 2100 kHzFPWM Mode
IOUT = Short Circuit to 2.5 AVIN = 13.5 V
Figure 10-29 LM61440-Q1 Short Circuit Recovery
GUID-AB7E7CE2-B64D-466B-893A-8B7966D8EAD6-low.png
VOUT = 3.3 VFSW = 400 kHzAUTO Mode
IOUT = 2 A to 4 A to 2 AVIN = 13.5 VTR = TF = 2µs
Figure 10-31 LM61440-Q1 Load Transient
GUID-762175D7-B571-4F55-97DA-F7DBC0342A77-low.png
VOUT = 5 VFSW = 2100 kHzAUTO Mode
IOUT = 2 A to 4 A to 2 AVIN = 13.5 VTR = TF = 2µs
Figure 10-33 LM61440-Q1 Load Transient
GUID-DE1942FA-6BB5-437D-9C12-79E3BEDA40ED-low.gif
VOUT = 5 VFSW = 400 kHzIOUT = 5 A
Frequency Tested: 30 MHz to 108 MHz
Figure 10-35 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
GUID-B4E55F90-3EF3-4ADE-85EE-FB5285EBE4ED-low.gif
VOUT = 5 VFSW = 400 kHzIOUT = 5 A
Frequency Tested: 30 MHz to 300 MHz
Figure 10-37 Radiated EMI Bicon Vertical versus CISPR25 Limits
GUID-877C4139-5105-49FE-95D8-3E75C383BD54-low.gif
VOUT = 5 VFSW = 400 kHzIOUT = 5 A
Frequency Tested: 300 MHz to 1 GHz
Figure 10-39 Radiated EMI Log Vertical versus CISPR25 Limits
GUID-FBBF115C-0894-4989-8321-8557DF5B1040-low.gif
FSW = 400 kHzNote: Measurements taken with LM61460EVM with 6 A variant
Figure 10-41 Recommended Input EMI Filter
GUID-0B5C6491-9CA0-402F-941B-AEA40A1DA093-low.gif
FSW = 2100 kHzVOUT = 5 VIOUT = 5 A
Frequency Tested: 30 MHz to 108 MHz
Figure 10-43 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
GUID-D3CA2467-1A8C-4B96-9839-D7B330F6D104-low.gif
VOUT = 3.3 VFSW = 2100 kHzFPWM Mode
Figure 10-6 LM61440-Q1 Efficiency
GUID-015EB34C-0F44-4B3B-BAB1-1D62F2F13819-low.gif
VOUT = 5 VFSW = 2100 kHzFPWM Mode
Figure 10-8 LM61440-Q1 Efficiency
GUID-2CB0DAA1-54ED-4456-B9E8-D12881665C46-low.gif
VOUT = 3.3 VFSW = 400 kHzFPWM Mode
Figure 10-10 LM61440-Q1 Load and Line Regulation
GUID-2CB0DAA1-54ED-4456-B9E8-D12881665C46-low.gif
VOUT = 3.3 VFSW = 2100 kHzFPWM Mode
Figure 10-12 LM61440-Q1 Load and Line Regulation
GUID-6CC1221A-6580-40B0-ACB5-55A7C3858669-low.gif
VOUT = 5 VFSW = 400 kHzFPWM Mode
Figure 10-14 LM61440-Q1 Load and Line Regulation
GUID-93EE0DD5-4F0C-43C0-80EB-B1A18C4E5D1A-low.gif
VOUT = 5VFSW = 2100 kHzFPWM Mode
Figure 10-16 LM61440-Q1 Load and Line Regulation
GUID-2FD93BD9-6266-4292-BA24-6706B4088687-low.gif
VOUT = 3.3 VFSW = 2100 kHzAUTO Mode
Figure 10-18 LM61440-Q1 Dropout Curve
GUID-F369F02E-D875-4CBC-B6F5-A70948690590-low.gif
VOUT = 5 VFSW = 2100 kHzAUTO Mode
Figure 10-20 LM61440-Q1 Dropout Curve
GUID-482E8B50-86BA-4101-ACE5-B1FCECD946AD-low.gif
VOUT = 3.3 VFSW = 2100 kHzAUTO Mode
Figure 10-22 LM61440-Q1 Frequency Dropout Curve
GUID-96BFF1C4-A254-4D01-A01B-46C47F2EA727-low.gif
VOUT = 5 VFSW = 2100 kHzAUTO Mode
Figure 10-24 LM61440-Q1 Frequency Dropout Curve
GUID-C2383EC2-A772-4047-845A-D3D70C9A3E92-low.gif
VOUT = 5 VFSW = 2100 kHzAUTO Mode
IOUT = 4 AVIN = 13.5 V
Figure 10-26 LM61440-Q1 Switching Waveform and VOUT Ripple
GUID-A1136D6A-8F05-4586-93C4-021F42B731DE-low.png
VOUT = 5 VFSW = 2100 kHzFPWM Mode
IOUT = 2.5 A to Short CircuitVIN = 13.5 V
Figure 10-28 LM61440-Q1 Short Circuit Protection
GUID-D5EBFE4C-C08C-4054-9C3F-6C7F2BA062D5-low.gif
VOUT = 5 VFSW = 2100 kHzFPWM Mode
IOUT = Short CircuitVIN = 13.5 V
Figure 10-30 LM61440-Q1 Short Circuit Performance
GUID-3E627E65-4E45-48EB-9444-CA73A9CECE47-low.png
VOUT = 3.3 VFSW = 2100 kHzAUTO Mode
IOUT = 2 A to 4 A to 2 AVIN = 13.5 VTR = TF = 2µs
Figure 10-32 LM61440-Q1 Load Transient
GUID-1A41920F-911A-4C1B-981A-B51CEFEFAE3D-low.gif
VOUT = 5 VFSW = 400 kHzIOUT = 5 A*
Frequency Tested: 150 kHz to 30 MHz
*Tested on 6 A Variant
Figure 10-34 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
GUID-0C52885A-4CC0-415E-A4E8-35B1577EC662-low.gif
VOUT = 5 VFSW = 400 kHzIOUT = 5 A
Frequency Tested: 150 kHz to 30 MHz
Figure 10-36 Radiated EMI Rod versus CISPR25 Limits
GUID-B4E55F90-3EF3-4ADE-85EE-FB5285EBE4ED-low.gif
VOUT = 5 VFSW = 400 kHzIOUT = 5 A
Frequency Tested: 30 MHz to 300 MHz
Figure 10-38 Radiated EMI Bicon Horizontal versus CISPR25 Limits
GUID-0945FEAD-15CD-4B6E-A277-D10C124FFF26-low.gif
VOUT = 5 VFSW = 400 kHzIOUT = 5 A
Frequency Tested: 300 MHz to 1 GHz
Figure 10-40 Radiated EMI Log Horizontal versus CISPR25 Limits
GUID-3F9B6263-2979-4968-8E4C-0E51A9713B94-low.gif
FSW = 2100 kHzVOUT = 5 VIOUT = 5 A*
Frequency Tested: 150 kHz to 30 MHz
*Tested on 6 A Variant
Figure 10-42 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
GUID-09D8B8C3-1AA0-4EA8-8E84-484305FE43CE-low.gif
Note: All EMI measurements taken with 6-A Variant
FSW = 2100 kHz
Figure 10-44 Recommended Input EMI Filter
Table 10-5 BOM for Typical Application Curves
VOUTFREQUENCYRFBBRTCOUTCIN + CHFLCFF
3.3 V400 kHz43.2 kΩ33.2 kΩ4 x 22 µF2 x 4.7 µF + 2 x 100 nF8.2 µH (XHMI6060)22 pF
3.3 V2100 kHz43.2 kΩ6.04 kΩ3 x 22 µF2 x 4.7 µF + 2 x 100 nF1.5 µH (MAPI 4020HT)22 pF
5 V400 kHz24.9 kΩ33.2 kΩ3 x 22 µF2 x 4.7 µF + 2 x 100 nF8.2 µH (XHMI6060)22 pF
5 V2100 kHz24.9 kΩ6.04 kΩ2 x 22 µF2 x 4.7 µF + 2 x 100 nF1.5 µH (MAPI 4020HT)22 pF