SNVSB70F May   2019  – June 2021 LM61460-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

10.2.3 Application Curves

GUID-F9C68715-3AFB-4283-A114-6F90AECCD21D-low.gif
VOUT = 3.3 V FSW = 400 kHz Auto Mode
Figure 10-5 LM61460-Q1 Efficiency
GUID-41C83CC1-BAA5-43B0-B20D-27870F67CFB7-low.gif
VOUT = 3.3 V FSW = 2100 kHz AUTO Mode
Figure 10-7 LM61460-Q1 Efficiency
GUID-A4F8B061-DAFF-44D1-BF17-EC7F9C716F18-low.gif
VOUT = 5 V FSW = 400 kHz AUTO Mode
Figure 10-9 LM61460-Q1 Efficiency
GUID-B8D3BF4A-67EA-4D74-AD7A-E4E96EE6375F-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
Figure 10-11 LM61460-Q1 Efficiency
GUID-49A8B68E-D2A7-4818-8DF2-16D08A48D8DB-low.gif
VOUT = 3.3 V FSW = 400 kHz Auto Mode
Figure 10-13 LM61460-Q1 Load and Line Regulation
GUID-44889586-48AA-440C-9388-82055EDAAAAE-low.gif
VOUT = 3.3 V FSW = 2100 kHz AUTO Mode
Figure 10-15 LM61460-Q1 Load and Line Regulation
GUID-CDF85840-8283-4FBF-A572-8CEDAD3F6780-low.gif
VOUT = 5 V FSW = 400 kHz AUTO Mode
Figure 10-17 LM61460-Q1 Load and Line Regulation
GUID-E2246C8A-3A24-48B3-95FE-5F1A1BB360B4-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
Figure 10-19 LM61460-Q1 Load and Line Regulation
GUID-D02F2FE6-34E1-43D3-B704-B040E4FCE455-low.gif
VOUT = 3.3 V FSW = 400 kHz AUTO Mode
Figure 10-21 LM61460-Q1 Dropout Curve
GUID-248040D5-054E-4400-B4EB-126460F78FFE-low.gif
VOUT = 5 V FSW = 400 kHz AUTO Mode
Figure 10-23 Dropout Curve
GUID-481CE63C-9B41-4011-8307-5878984C2D2D-low.gif
VOUT = 3.3 V FSW = 400 kHz AUTO Mode
Figure 10-25 LM61460-Q1 Frequency Dropout
GUID-6ABB667F-B1ED-429F-A7B0-D2D97F711648-low.gif
VOUT = 5 V FSW = 400 kHz AUTO Mode
Figure 10-27 LM61460-Q1 Frequency Dropout Curve
GUID-F81DC974-E2B5-4165-BC79-497F2EFC3755-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
IOUT = 50 mA VIN = 13.5 V
Figure 10-29 LM61460-Q1 Switching Waveform and VOUT Ripple
GUID-446DE865-5091-49FE-A59C-A19B257DA52D-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
IOUT = 50 mA VIN = 13.5 V
Figure 10-31 LM61460-Q1 Start-up with 50-mA Load
GUID-0CE3E275-CF3E-4D9C-9C0E-8D0535EC565D-low.gif
VOUT = 3.3 V FSW = 2100 kHz FPWM Mode
IOUT = 3.25 A VIN = 13.5 V
Figure 10-33 LM61460-Q1 Start-up with 3.25-A
GUID-8EBA46DB-1CEE-47D2-A22A-6F2748148A41-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = Short Circuit to 5 A VIN = 13.5 V
Figure 10-35 LM61460-Q1 Short Circuit Recovery
GUID-287B4C5C-731C-4CF5-8E2B-52801109D680-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = 4 A VIN = 13.5 V to 4 V to 13.5 V
Figure 10-37 Graceful Recovery from Dropout
GUID-48C59BAA-6A85-49A5-829E-B7ABF0B4149F-low.gif
VOUT = 5 V FSW = 400 kHz FPWM Mode
IOUT = 0 A to 6 A to 0 A VIN = 13.5 V TR = TF = 6 µs
Figure 10-39 LM61460-Q1 Load Transient
GUID-DC36844D-6B8E-4235-A710-286E91E84612-low.gif
VOUT = 5 V FSW = 400 kHz AUTO Mode
IOUT = 50 mA to 6 A to 50 mA VIN = 13.5 V TR = TF = 6 µs
Figure 10-41 LM61460-Q1 Load Transient
GUID-EBE83123-CA62-4D37-A2BE-C43BD7F04DB3-low.gif
VOUT = 3.3 V FSW = 400 kHz AUTO Mode
IOUT = 2 A to 4 A to 2 A VIN = 13.5 V TR = TF = 2 µs
Figure 10-43 LM61460-Q1 Load Transient
GUID-D791E6E7-CEB7-488A-A133-CEB53FE197B6-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = 0 A to 6 A to 0 A VIN = 13.5 V TR = TF = 6 µs
Figure 10-45 LM61460-Q1 Load Transient
GUID-3BD2316C-E9FB-41E3-8DE0-E2DA065E05D5-low.gif
VOUT = 5 V FSW = 400 kHz IOUT = 5 A
Frequency Tested: 30 MHz to 108 MHz
Figure 10-47 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
GUID-1D7A6209-F6C1-4496-8A7C-B21D9CE642BC-low.gif
VOUT = 5 V FSW = 400 kHz IOUT = 5 A
Frequency Tested: 30 MHz to 300 MHz
Figure 10-49 Radiated EMI Bicon Vertical versus CISPR25 Limits
GUID-8D76EC0F-745D-4523-81AF-F72F7F366502-low.gif
VOUT = 5 V FSW = 400 kHz IOUT = 5 A
Frequency Tested: 300 MHz to 1 GHz
Figure 10-51 Radiated EMI Log Vertical versus CISPR25 Limits
GUID-3C8048EF-029D-46C3-B54D-E78FA1461C51-low.gif
 
 
 
 
FSW = 400 kHz Note: Measurements taken with LM61460EVM
Figure 10-53 Recommended Input EMI Filter
GUID-0479AFBA-C335-40AE-A4C0-E087BF11A1B3-low.gif
FSW = 2100 kHz VOUT = 5 V IOUT = 5 A
Frequency Tested: 30 MHz to 108 MHz
Figure 10-55 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
GUID-D1669238-AE73-4D67-9733-BDC7ED61869B-low.gif
VOUT = 3.3 V FSW = 400 kHz FPWM Mode
Figure 10-6 LM61460-Q1 Efficiency
GUID-5760F717-E53E-408D-A2D2-263954FBA1B6-low.gif
VOUT = 3.3 V FSW = 2100 kHz FPWM Mode
Figure 10-8 LM61460-Q1 Efficiency
GUID-F421AA2F-5E08-4B73-A0C2-0BDFBDA68AE2-low.gif
VOUT = 5 V FSW = 400 kHz FPWM Mode
Figure 10-10 LM61460-Q1 Efficiency
GUID-9A5806DB-C967-4829-865E-E52FE729CB1E-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
Figure 10-12 LM61460-Q1 Efficiency
GUID-30548AF7-435E-44F9-A731-C3EC31672880-low.gif
VOUT = 3.3 V FSW = 400 kHz FPWM Mode
Figure 10-14 LM61460-Q1 Load and Line Regulation
GUID-708BA71D-79EE-4E1C-8F75-7B0012E7CEAD-low.gif
VOUT = 3.3 V FSW = 2100 kHz FPWM Mode
Figure 10-16 LM61460-Q1 Load and Line Regulation
GUID-B243806C-426C-4970-BF63-C034E41B21EF-low.gif
VOUT = 5 V FSW = 400 kHz FPWM Mode
Figure 10-18 LM61460-Q1 Load and Line Regulation
GUID-EDF0CAE7-8A07-465E-BB17-E29BC9803DB3-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
Figure 10-20 LM61460-Q1 Load and Line Regulation
GUID-98C1AA68-0F1B-44E4-ACFB-E042327D0720-low.gif
VOUT = 3.3 V FSW = 2100 kHz AUTO Mode
Figure 10-22 LM61460-Q1 Dropout Curve
GUID-C71D974A-94A0-4C90-9F5D-7EE76307F9F2-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
Figure 10-24 LM61460-Q1 Dropout Curve
GUID-D0D8E8E2-C736-4371-8FDB-04EAEA630688-low.gif
VOUT = 3.3 V FSW = 2100 kHz AUTO Mode
Figure 10-26 LM61460-Q1 Frequency Dropout Curve
GUID-C414D320-FA0E-4A5D-A17F-843CF38EB5D1-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
Figure 10-28 LM61460-Q1 Frequency Dropout Curve
GUID-791E6825-64DF-43B9-A033-14E7C1D87396-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = 50 mA VIN = 13.5 V
Figure 10-30 LM61460-Q1 Switching Waveform and VOUT Ripple
GUID-8025D31C-9D11-4EBC-A72E-B7347E3FDA43-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = 50 mA VIN = 13.5 V
Figure 10-32 LM61460-Q1 Start-up with 50-mA
GUID-87F2A470-2FF1-4CC1-895E-27A8892A8925-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = 5 A to Short Circuit VIN = 13.5 V
Figure 10-34 LM61460-Q1 Short Circuit Protection
GUID-3D234A28-4EAB-4257-8D1E-0DC46EF0B40B-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = Short Circuit VIN = 13.5 V
Figure 10-36 LM61460-Q1 Short Circuit Performance
GUID-E28801DA-57A6-42DF-A9D2-6D79810D0757-low.gif
VOUT = 5 V FSW = 400 kHz AUTO Mode
IOUT = 0 A to 6 A to 0 A VIN = 13.5 V TR = TF = 6 µs
Figure 10-38 LM61460-Q1 Load Transient
GUID-19AA0704-CD10-4466-997D-4E6271F23097-low.gif
VOUT = 5 V FSW = 400 kHz AUTO Mode
IOUT = 2 A to 5 A to 2 A VIN = 13.5 V TR = TF = 3 µs
Figure 10-40 LM61460-Q1 Load Transient
GUID-6203CC53-456A-4C6B-9439-833AB3D9368F-low.gif
VOUT = 3.3 V FSW = 400 kHz AUTO Mode
IOUT = 0 A to 6 A to 0 A VIN = 13.5 V TR = TF = 6 µs
Figure 10-42 LM61460-Q1 Load Transient
GUID-B3C85E53-ECE6-42BD-86E4-09561E19A8B3-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
IOUT = 0 A to 6 A to 0 A VIN = 13.5 V TR = TF = 6 µs
Figure 10-44 LM61460-Q1 Load Transient
GUID-1EE635E2-EEB5-4B50-937A-2173F496EE7D-low.gif
FSW = 400 kHz VOUT = 5 V IOUT = 5 A
Frequency Tested: 150 kHz to 30 MHz
Figure 10-46 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
GUID-7D161623-8B8D-4399-BFEF-CB9F120E5B61-low.gif
VOUT = 5 V FSW = 400 kHz IOUT = 5 A
Frequency Tested: 150 kHz to 30 MHz
Figure 10-48 Radiated EMI Rod versus CISPR25 Limits
GUID-1D7A6209-F6C1-4496-8A7C-B21D9CE642BC-low.gif
VOUT = 5 V FSW = 400 kHz IOUT = 5 A
Frequency Tested: 30 MHz to 300 MHz
Figure 10-50 Radiated EMI Bicon Horizontal versus CISPR25 Limits
GUID-14EE1B7E-005E-4227-B91F-8A076F11A9FA-low.gif
VOUT = 5 V FSW = 400 kHz IOUT = 5 A
Frequency Tested: 300 MHz to 1 GHz
Figure 10-52 Radiated EMI Log Horizontal versus CISPR25 Limits
GUID-2377F28C-138C-4189-BCDC-0C68CA319D26-low.gif
FSW = 2100 kHz VOUT = 5 V IOUT = 5 A
Frequency Tested: 150 kHz to 30 MHz
Figure 10-54 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
GUID-9F56B465-DC78-4972-86E6-89213C3A96E9-low.gif
 
 
 
 
 
FSW = 2100 kHz
Figure 10-56 Recommended Input EMI Filter
Table 10-5 BOM for Typical Application Curves
VOUT FREQUENCY RFBB RT COUT CIN + CHF L CFF
3.3 V 400 kHz 43.2 kΩ 33.2 kΩ 6 x 22 µF 2 x 4.7 µF + 2 x 100 nF 4.7 µH (XHMI6060) 22 pF
3.3 V 2100 kHz 43.2 kΩ 6.04 kΩ 3 x 22 µF 2 x 4.7 µF + 2 x 100 nF 1 µH (XEL5030) 22 pF
5 V 400 kHz 24.9 kΩ 33.2 kΩ 4 x 22 µF 2 x 4.7 µF + 2 x 100 nF 4.7 µH (XHMI6060) 22 pF
5 V 2100 kHz 24.9 kΩ 6.04 kΩ 3 x 22 µF 2 x 4.7 µF + 2 x 100 nF 1 µH (XEL5030) 22 pF