SNVSCR9 October   2024 LM61495T-Q1

ADVANCE INFORMATION  

  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 Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 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  Output Voltage Selection
      2. 7.3.2  Enable EN Pin and Use as VIN UVLO
      3. 7.3.3  SYNC/MODE Uses for Synchronization
      4. 7.3.4  Clock Locking
      5. 7.3.5  Adjustable Switching Frequency
      6. 7.3.6  RESET Output Operation
      7. 7.3.7  Internal LDO, VCC UVLO, and BIAS Input
      8. 7.3.8  Bootstrap Voltage and VCBOOT-UVLO (CBOOT Pin)
      9. 7.3.9  Adjustable SW Node Slew Rate
      10. 7.3.10 Spread Spectrum
      11. 7.3.11 Soft Start and Recovery From Dropout
      12. 7.3.12 Overcurrent and Short-Circuit Protection
      13. 7.3.13 Hiccup
      14. 7.3.14 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
        1. 7.4.3.1 Peak Current Mode Operation
        2. 7.4.3.2 Auto Mode Operation
          1. 7.4.3.2.1 Diode Emulation
        3. 7.4.3.3 FPWM Mode Operation
        4. 7.4.3.4 Minimum On-time (High Input Voltage) Operation
        5. 7.4.3.5 Dropout
        6. 7.4.3.6 Recovery from Dropout
        7. 7.4.3.7 Other Fault Modes
  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
        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  BOOT Capacitor
        7. 8.2.2.7  BOOT Resistor
        8. 8.2.2.8  VCC
        9. 8.2.2.9  CFF and RFF Selection
        10. 8.2.2.10 RSPSP Selection
        11. 8.2.2.11 RT Selection
        12. 8.2.2.12 RMODE Selection
        13. 8.2.2.13 External UVLO
        14. 8.2.2.14 Maximum Ambient Temperature
      3. 8.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
        1. 8.4.1.1 Ground and Thermal Considerations
      2. 8.4.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
    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 Glossary
    7. 9.7 Electrostatic Discharge Caution
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Tape and Reel Information

Package Options

Mechanical Data (Package|Pins)
  • VAM|16
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.2.3 Application Curves

Unless otherwise specified, the following conditions apply: device: LM61495-Q1, VIN = 13.5V, TA = 25°C. The circuit is shown in Figure 8-1, with the appropriate BOM from Table 8-4.

LM61480T-Q1 LM61495T-Q1 Efficiency
VOUT = 5VFSW = 400kHzAuto mode
Figure 8-4 Efficiency
LM61480T-Q1 LM61495T-Q1 Efficiency
VOUT = 3.3VFSW = 400kHzAuto mode
Figure 8-6 Efficiency
LM61480T-Q1 LM61495T-Q1 Efficiency
VOUT = 5VFSW = 2.2MHzAuto mode
Figure 8-8 Efficiency
LM61480T-Q1 LM61495T-Q1 Efficiency
VOUT = 3.3VFSW = 2.2MHzAuto mode
Figure 8-10 Efficiency
LM61480T-Q1 LM61495T-Q1 Load and Line Regulation
VOUT = 5VFSW = 400kHzAuto mode
Figure 8-12 Load and Line Regulation
LM61480T-Q1 LM61495T-Q1 Load and Line Regulation
VOUT = 3.3VFSW = 400kHzAuto mode
Figure 8-14 Load and Line Regulation
LM61480T-Q1 LM61495T-Q1 Load and Line Regulation
VOUT = 5VFSW = 2.2MHzAuto mode
Figure 8-16 Load and Line Regulation
LM61480T-Q1 LM61495T-Q1 Load and Line Regulation
VOUT = 3.3VFSW = 2.2MHzAuto mode
Figure 8-18 Load and Line Regulation
LM61480T-Q1 LM61495T-Q1 Dropout
VOUT = 5VFSW = 400kHzAuto mode
Figure 8-20 Dropout
LM61480T-Q1 LM61495T-Q1 Dropout
VOUT = 5VFSW = 2.2MHzAuto mode
Figure 8-22 Dropout
LM61480T-Q1 LM61495T-Q1 Frequency Dropout
VOUT = 5VFSW = 400kHzAuto mode
Figure 8-24 Frequency Dropout
LM61480T-Q1 LM61495T-Q1 Frequency Dropout
VOUT = 5VFSW = 2.2MHzAuto mode
Figure 8-26 Frequency Dropout
LM61480T-Q1 LM61495T-Q1 Switching Waveform and VOUT Ripple
VOUT = 5V FSW = 2100kHz Auto mode
IOUT = 50mA VIN = 13.5V
Figure 8-28 Switching Waveform and VOUT Ripple
LM61480T-Q1 LM61495T-Q1 Start-Up With 50mA Load
VOUT = 5V FSW = 2100kHz Auto mode
IOUT = 50mA VIN = 13.5V
Figure 8-30 Start-Up With 50mA Load
LM61480T-Q1 LM61495T-Q1 Start-Up With 3.25A Load
VOUT = 3.3V FSW = 2100kHz FPWM mode
IOUT = 3.25A VIN = 13.5V
Figure 8-32 Start-Up With 3.25A Load
LM61480T-Q1 LM61495T-Q1 Short-Circuit Recovery
VOUT = 5V FSW = 2100kHz FPWM mode
IOUT = Short Circuit to 5A VIN = 13.5V
Figure 8-34 Short-Circuit Recovery
LM61480T-Q1 LM61495T-Q1 Load Transient
VOUT = 5V FSW = 400kHz Auto mode
IOUT = 10mA to 10A to 10mA VIN = 13.5V TR = TF = 1µs
Figure 8-36 Load Transient
LM61480T-Q1 LM61495T-Q1 Load Transient
VOUT = 5V FSW = 400kHz Auto mode
IOUT = 2A to 4A to 2A VIN = 13.5V TR = TF = 1µs
Figure 8-38 Load Transient
LM61480T-Q1 LM61495T-Q1 Load Transient
VOUT = 3.3VFSW = 400kHzAuto mode
IOUT = 10mA to 10A to 10mAVIN = 13.5VTR = TF = 1µs
Figure 8-40 Load Transient
LM61480T-Q1 LM61495T-Q1 Load Transient
VOUT = 5VFSW = 2200kHzFPWM mode
IOUT = 10mA to 10A to 10mAVIN = 13.5VTR = TF = 1µs
Figure 8-42 Load Transient
LM61480T-Q1 LM61495T-Q1 Load Transient
VOUT = 5VFSW = 2200kHzAuto mode
IOUT = 5A to 10A to 5AVIN = 13.5VTR = TF = 1µs
Figure 8-44 Load Transient
LM61480T-Q1 LM61495T-Q1 Radiated EMI Bicon Horizontal vs CISPR25 Class 5 Limits
VOUT = 5VFSW = 400kHzIOUT = 10A
Frequency tested: 30MHz to 300MHz
Figure 8-46 Radiated EMI Bicon Horizontal vs CISPR25 Class 5 Limits
LM61480T-Q1 LM61495T-Q1 Radiated EMI Log Horizontal vs CISPR25 Class 5 Limits
VOUT = 5VFSW = 400kHzIOUT = 10A
Frequency tested: 300MHz to 1GHz
Figure 8-48 Radiated EMI Log Horizontal vs CISPR25 Class 5 Limits
LM61480T-Q1 LM61495T-Q1 Recommended Input EMI FilterFigure 8-50 Recommended Input EMI Filter
LM61480T-Q1 LM61495T-Q1 Radiated EMI Bicon Horizontal vs CISPR25 Class 5 Limits
VOUT = 5VFSW = 2.2MHzIOUT = 4A
Frequency tested: 30MHz to 300MHz
Figure 8-52 Radiated EMI Bicon Horizontal vs CISPR25 Class 5 Limits
LM61480T-Q1 LM61495T-Q1 Radiated EMI Log Horizontal vs CISPR25 Class 5 Limits
VOUT = 5VFSW = 2.2MHzIOUT = 4A
Frequency tested: 300MHz to 1GHz
Figure 8-54 Radiated EMI Log Horizontal vs CISPR25 Class 5 Limits
LM61480T-Q1 LM61495T-Q1 Recommended Input EMI FilterFigure 8-56 Recommended Input EMI Filter
LM61480T-Q1 LM61495T-Q1 Efficiency
VOUT = 5VFSW = 400kHzFPWM mode
Figure 8-5 Efficiency
LM61480T-Q1 LM61495T-Q1 Efficiency
VOUT = 3.3VFSW = 400kHzFPWM mode
Figure 8-7 Efficiency
LM61480T-Q1 LM61495T-Q1 Efficiency
VOUT = 5VFSW = 2.2MHzFPWM mode
Figure 8-9 Efficiency
LM61480T-Q1 LM61495T-Q1 Efficiency
VOUT = 3.3VFSW = 2.2MHzFPWM mode
Figure 8-11 Efficiency
LM61480T-Q1 LM61495T-Q1 Load and Line Regulation
VOUT = 5VFSW = 400kHzFPWM mode
Figure 8-13 Load and Line Regulation
LM61480T-Q1 LM61495T-Q1 Load and Line Regulation
VOUT = 3.3VFSW = 400kHzFPWM mode
Figure 8-15 Load and Line Regulation
LM61480T-Q1 LM61495T-Q1 Load and Line Regulation
VOUT = 5VFSW = 2.2MHzFPWM mode
Figure 8-17 Load and Line Regulation
LM61480T-Q1 LM61495T-Q1 Load and Line Regulation
VOUT = 3.3VFSW = 2.2MHzFPWM mode
Figure 8-19 Load and Line Regulation
LM61480T-Q1 LM61495T-Q1 Dropout
VOUT = 3.3VFSW = 400kHzAuto mode
Figure 8-21 Dropout
LM61480T-Q1 LM61495T-Q1 Dropout
VOUT = 3.3VFSW = 2.2MHzAuto mode
Figure 8-23 Dropout
LM61480T-Q1 LM61495T-Q1 Frequency Dropout
VOUT = 3.3VFSW = 400kHzAuto mode
Figure 8-25 Frequency Dropout
LM61480T-Q1 LM61495T-Q1 Frequency Dropout
VOUT = 3.3VFSW = 2.2MHzAuto mode
Figure 8-27 Frequency Dropout
LM61480T-Q1 LM61495T-Q1 Switching Waveform and VOUT Ripple
VOUT = 5V FSW = 2100kHz FPWM mode
IOUT = 50mA VIN = 13.5V
Figure 8-29 Switching Waveform and VOUT Ripple
LM61480T-Q1 LM61495T-Q1 Start-Up With 50mA Load
VOUT = 5V FSW = 2100kHz FPWM mode
IOUT = 50mA VIN = 13.5V
Figure 8-31 Start-Up With 50mA Load
LM61480T-Q1 LM61495T-Q1 Short-Circuit Protection
VOUT = 5V FSW = 2100kHz FPWM mode
IOUT = 5A to Short Circuit VIN = 13.5V
Figure 8-33 Short-Circuit Protection
LM61480T-Q1 LM61495T-Q1 Recovery from Dropout
VOUT = 5V FSW = 2100kHz FPWM mode
IOUT = 4A VIN = 13.5V to 4V to 13.5V
Figure 8-35 Recovery from Dropout
LM61480T-Q1 LM61495T-Q1 Load Transient
VOUT = 5V FSW = 400kHz FPWM mode
IOUT = 10mA to 10A to 10mA VIN = 13.5V TR = TF = 1µs
Figure 8-37 Load Transient
LM61480T-Q1 LM61495T-Q1 Load Transient
VOUT = 5V FSW = 400kHz Auto mode
IOUT = 5A to 10A to 5A VIN = 13.5V TR = TF = 1µs
Figure 8-39 Load Transient
LM61480T-Q1 LM61495T-Q1 Load Transient
VOUT = 3.3VFSW = 400kHzAuto mode
IOUT = 5A to 10A to 5AVIN = 13.5VTR = TF = 1µs
Figure 8-41 Load Transient
LM61480T-Q1 LM61495T-Q1 Load Transient
VOUT = 5V FSW = 2200kHz Auto mode
IOUT = 2A to 4A to 2A VIN = 13.5V TR = TF = 1µs
Figure 8-43 Load Transient
LM61480T-Q1 LM61495T-Q1 Conducted EMI vs CISPR25 Class 5 Limits (Green: Peak Signal, Blue: Average Signal)
VOUT = 5VFSW = 400kHzIOUT = 10A
Frequency tested: 150kHz to 30MHz
Figure 8-45 Conducted EMI vs CISPR25 Class 5 Limits (Green: Peak Signal, Blue: Average Signal)
LM61480T-Q1 LM61495T-Q1 Radiated EMI Bicon Vertical vs CISPR25 Class 5 Limits
VOUT = 5VFSW = 400kHzIOUT = 10A
Frequency tested: 30MHz to 300MHz
Figure 8-47 Radiated EMI Bicon Vertical vs CISPR25 Class 5 Limits
LM61480T-Q1 LM61495T-Q1 Radiated EMI Log Vertical vs CISPR25 Class 5 Limits
VOUT = 5VFSW = 400kHzIOUT = 10A
Frequency tested: 300MHz to 1GHz
Figure 8-49 Radiated EMI Log Vertical vs CISPR25 Class 5 Limits
LM61480T-Q1 LM61495T-Q1 Conducted EMI vs CISPR25 Class 5 Limits (Green: Peak Signal, Blue: Average Signal)
VOUT = 5VFSW = 2.2MHzIOUT = 4A
Frequency tested: 150kHz to 30MHz
Figure 8-51 Conducted EMI vs CISPR25 Class 5 Limits (Green: Peak Signal, Blue: Average Signal)
LM61480T-Q1 LM61495T-Q1 Radiated EMI Bicon Vertical vs CISPR25 Class 5 Limits
VOUT = 5VFSW = 2.2MHzIOUT = 4A
Frequency tested: 30MHz to 300MHz
Figure 8-53 Radiated EMI Bicon Vertical vs CISPR25 Class 5 Limits
LM61480T-Q1 LM61495T-Q1 Radiated EMI Log Vertical vs CISPR25 Class 5 Limits
VOUT = 5VFSW = 2.2MHzIOUT = 4A
Frequency tested: 300MHz to 1GHz
Figure 8-55 Radiated EMI Log Vertical vs CISPR25 Class 5 Limits
Table 8-4 BOM for Typical Application Curves
VOUTFREQUENCYRFBBCOUTCIN + CHFLCFF
3.3V400kHz43.2kΩ4 × 47µF + 100µF electrolytic + 2 × 2.2µF4 × 10µF + 2 × 470nF + 100µF electrolytic2.4µH (744325240)22pF
3.3V2.2MHz43.2kΩ2 × 47µF + 100µF electrolytic + 2 × 2.2µF2 × 10µF + 2 × 470nF + 100µF electrolytic0.68µH (744373460068)10pF
5V400kHz24.9kΩ4 × 47µF + 100µF electrolytic + 2 × 2.2µF4 × 10µF + 2 × 470nF + 100µF electrolytic2.4µH (744325240)22pF
5V2.2MHz24.9kΩ2 × 47µF + 100µF electrolytic + 2 × 2.2µF2 × 10µF + 2 × 470nF + 100µF electrolytic0.68µH (744373460068)10pF