SNVSBP3B May   2020  – June 2021 LM62435-Q1

PRODUCTION DATA  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
  7. 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 Systems Characteristics
    8. 7.8 Typical Characteristics
  8. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  EN Uses for Enable and VIN UVLO
      2. 8.3.2  MODE/SYNC Pin Operation
        1. 8.3.2.1 Level-Dependent MODE/SYNC Pin Control
        2. 8.3.2.2 Pulse-Dependent MODE/SYNC Pin Control
        3. 8.3.2.3 Clock Locking
      3. 8.3.3  PGOOD Output Operation
      4. 8.3.4  Internal LDO, VCC UVLO, and BIAS Input
      5. 8.3.5  Bootstrap Voltage and VCBOOT-UVLO (CBOOT Pin)
      6. 8.3.6  Adjustable SW Node Slew Rate
      7. 8.3.7  Spread Spectrum
      8. 8.3.8  Soft Start and Recovery From Dropout
      9. 8.3.9  Output Voltage Setting
      10. 8.3.10 Overcurrent and Short Circuit Protection
      11. 8.3.11 Thermal Shutdown
      12. 8.3.12 Input Supply Current
    4. 8.4 Device Functional Modes
      1. 8.4.1 Shutdown Mode
      2. 8.4.2 Standby Mode
      3. 8.4.3 Active Mode
        1. 8.4.3.1 CCM Mode
        2. 8.4.3.2 Auto Mode - Light Load Operation
          1. 8.4.3.2.1 Diode Emulation
          2. 8.4.3.2.2 Frequency Reduction
        3. 8.4.3.3 FPWM Mode - Light Load Operation
        4. 8.4.3.4 Minimum On-time (High Input Voltage) Operation
        5. 8.4.3.5 Dropout
  9. 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  Choosing the Switching Frequency
        2. 9.2.2.2  Setting the Output Voltage
        3. 9.2.2.3  Inductor Selection
        4. 9.2.2.4  Output Capacitor Selection
        5. 9.2.2.5  Input Capacitor Selection
        6. 9.2.2.6  BOOT Capacitor
        7. 9.2.2.7  BOOT Resistor
        8. 9.2.2.8  VCC
        9. 9.2.2.9  BIAS
        10. 9.2.2.10 CFF and RFF Selection
        11. 9.2.2.11 External UVLO
      3. 9.2.3 Application Curves
  10. 10Power Supply Recommendations
  11. 11Layout
    1. 11.1 Layout Guidelines
      1. 11.1.1 Ground and Thermal Considerations
    2. 11.2 Layout Example
  12. 12Device and Documentation Support
    1. 12.1 Documentation Support
      1. 12.1.1 Related Documentation
    2. 12.2 Receiving Notification of Documentation Updates
    3. 12.3 Support Resources
    4. 12.4 Trademarks
    5. 12.5 Electrostatic Discharge Caution
    6. 12.6 Glossary
  13. 13Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.3 Application Curves

GUID-0ACCBC57-2770-4B28-89FC-23ABF0C62286-low.gif
VOUT = 3.3 V FSW = 2100 kHz AUTO Mode
Figure 9-5 LM62435-Q1 Efficiency
GUID-80553E09-AFBA-428E-BDCB-E5EC433FA9B0-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
Figure 9-7 LM62435-Q1 Efficiency
GUID-53CF3809-8E14-45DF-A7D5-023CF50FBDAF-low.gif
VOUT = 3.3 V FSW = 2100 kHz Auto Mode
Figure 9-9 LM62435-Q1 Load and Line Regulation
GUID-5D2B7554-95A1-4B3A-AD5C-B78B2104AFA2-low.gif
VOUT = 5V FSW = 2100 kHz Auto Mode
Figure 9-11 LM62435-Q1 Load and Line Regulation
GUID-1C4F5B0A-8486-4CEA-986E-5E893553BB82-low.gif
VOUT = 3.3 V FSW = 2100 kHz AUTO Mode
Figure 9-13 LM62435-Q1 Dropout Curve
GUID-1C9E373C-30D4-424A-90FD-32989000A085-low.gif
VOUT = 3.3 V FSW = 2100 kHz AUTO Mode
Figure 9-15 LM62435-Q1 Frequency Dropout Curve
GUID-BB25F99A-F727-4766-89B2-0316B5F32BB9-low.png
VOUT = 5 V FSW = 2100 kHz AUTO Mode
IOUT = 100 mA VIN = 13.5 V
Figure 9-17 LM62435-Q1 Switching Waveform and VOUT Ripple
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 9-19 LM62435-Q1 Start-up with 3.25 A
GUID-A85900B1-8C3B-468A-8095-98CC60DB1C75-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = Short Circuit to 2.5 A VIN = 13.5 V
Figure 9-21 LM62435-Q1 Short Circuit Recovery
GUID-2D84E3D2-3233-43FE-BF54-E53DD5A52263-low.png
VOUT = 3.3 V FSW = 2100 kHz AUTO Mode
IOUT = 1.5 A to 3.5 A to 1.5 A VIN = 13.5 V TR = TF = 2µs
Figure 9-23 LM62435-Q1 Load Transient
GUID-1EE635E2-EEB5-4B50-937A-2173F496EE7D-low.gif
VOUT = 5 V FSW = 400 kHz IOUT = 5 A*
Frequency Tested: 150 kHz to 30 MHz
*Tested on 6 A Variant
Figure 9-25 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 9-27 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 9-29 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 9-31 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
*Tested on 6 A Variant
Figure 9-33 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
GUID-9F56B465-DC78-4972-86E6-89213C3A96E9-low.gif
Note: All EMI measurements taken with 6 A Variant
FSW = 2100 kHz
Figure 9-35 Recommended Input EMI Filter
GUID-2E4769EA-989C-4649-862D-DD1BCC5E3792-low.gif
VOUT = 3.3 V FSW = 2100 kHz FPWM Mode
Figure 9-6 LM62435-Q1 Efficiency
GUID-DFEFC4A6-C5B8-4FCF-A12E-61B213DF8F83-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
Figure 9-8 LM62435-Q1 Efficiency
GUID-5B6BF58C-14C9-48C3-B77A-44DC16BD5687-low.gif
VOUT = 3.3 V FSW = 2100 kHz FPWM Mode
Figure 9-10 LM62435-Q1 Load and Line Regulation
GUID-1BCB800C-B6F1-4E65-969F-09AAA9BAB498-low.gif
VOUT = 5V FSW = 2100 kHz FPWM Mode
Figure 9-12 LM62435-Q1 Load and Line Regulation
GUID-6C34BBEC-8151-48FC-B848-13FDD6DBF511-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
Figure 9-14 LM62435-Q1 Dropout Curve
GUID-F328D2EF-FC89-4A27-9F4D-939E4D20C67F-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
Figure 9-16 LM62435-Q1 Frequency Dropout Curve
GUID-0D1663D7-6417-4144-BD9A-47573C12A861-low.gif
VOUT = 5 V FSW = 2100 kHz AUTO Mode
IOUT = 3.5 A VIN = 13.5 V
Figure 9-18 LM62435-Q1 Switching Waveform and VOUT Ripple
GUID-1271C46E-F87B-4597-A68B-824BC3F4A889-low.png
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = 2.5 A to Short Circuit VIN = 13.5 V
Figure 9-20 LM62435-Q1 Short Circuit Protection
GUID-98B0A357-72A8-4B60-8F03-A3ECF61A9DAF-low.gif
VOUT = 5 V FSW = 2100 kHz FPWM Mode
IOUT = Short Circuit VIN = 13.5 V
Figure 9-22 LM62435-Q1 Short Circuit Performance
GUID-61C685E9-766C-4739-A725-3AD0EBB7CE65-low.png
VOUT = 5 V FSW = 2100 kHz AUTO Mode
IOUT = 1.5 A to 3.5 A to 1.5 A VIN = 13.5 V TR = TF = 2µs
Figure 9-24 LM62435-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 9-26 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 9-28 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 9-30 Radiated EMI Log Vertical versus CISPR25 Limits
GUID-3C8048EF-029D-46C3-B54D-E78FA1461C51-low.gif
 
 
 
FSW = 400 kHz Note: Measurements taken with LM61460EVM with 6 A variant
Figure 9-32 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 9-34 Conducted EMI versus CISPR25 Limits (Yellow: Peak Signal, Blue: Average Signal)
Table 9-5 BOM for Typical Application Curves
VOUT FREQUENCY RFBB RT COUT CIN + CHF L CFF
3.3 V 2100 kHz 43.2 kΩ 6.04 kΩ 3 x 22 µF 2 x 4.7 µF + 2 x 100 nF 1.5 µH (MAPI 4020HT) 22 pF
5 V 2100 kHz 24.9 kΩ 6.04 kΩ 2 x 22 µF 2 x 4.7 µF + 2 x 100 nF 1.5 µH (MAPI 4020HT) 22 pF