SNVSCI9A June   2024  – September 2024 LMR36503E-Q1

PRODUCTION DATA  

  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 (Automotive) Ratings
    3. 6.3 Recommended Operating Conditions
    4. 6.4 Thermal Information
    5. 6.5 Electrical Characteristics
    6. 6.6 System Characteristics
    7. 6.7 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  Enable, Start-Up, and Shutdown
      2. 7.3.2  External CLK SYNC (with MODE/SYNC)
        1. 7.3.2.1 Pulse-Dependent MODE/SYNC Pin Control
      3. 7.3.3  Adjustable Switching Frequency (with RT)
      4. 7.3.4  Power-Good Output Operation
      5. 7.3.5  Internal LDO, VCC UVLO, and VOUT/BIAS Input
      6. 7.3.6  Bootstrap Voltage and VCBOOT-UVLO (CBOOT Terminal)
      7. 7.3.7  Output Voltage Selection
      8. 7.3.8  Soft Start and Recovery from Dropout
        1. 7.3.8.1 Recovery from Dropout
      9. 7.3.9  Current Limit and Short Circuit
      10. 7.3.10 Thermal Shutdown
      11. 7.3.11 Input Supply Current
    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 CCM Mode
        2. 7.4.3.2 Auto Mode - Light Load Operation
          1. 7.4.3.2.1 Diode Emulation
          2. 7.4.3.2.2 Frequency Reduction
        3. 7.4.3.3 FPWM Mode - Light Load Operation
        4. 7.4.3.4 Minimum On-Time (High Input Voltage) Operation
        5. 7.4.3.5 Dropout
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 High Temperature Specifications
    2. 8.2 Typical Application
      1. 8.2.1 Design Requirements
      2. 8.2.2 Detailed Design Procedure
        1. 8.2.2.1  Custom Design With WEBENCH® Tools
        2. 8.2.2.2  Choosing the Switching Frequency
        3. 8.2.2.3  Setting the Output Voltage
          1. 8.2.2.3.1 FB for Adjustable Output
        4. 8.2.2.4  Inductor Selection
        5. 8.2.2.5  Output Capacitor Selection
        6. 8.2.2.6  Input Capacitor Selection
        7. 8.2.2.7  CBOOT
        8. 8.2.2.8  VCC
        9. 8.2.2.9  CFF Selection
          1. 8.2.2.9.1 External UVLO
        10. 8.2.2.10 Maximum Ambient Temperature
      3. 8.2.3 Application Curves
    3. 8.3 Best Design Practices
    4. 8.4 Power Supply Recommendations
    5. 8.5 Layout
      1. 8.5.1 Layout Guidelines
        1. 8.5.1.1 Ground and Thermal Considerations
      2. 8.5.2 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Third-Party Products Disclaimer
      2. 9.1.2 Development Support
        1. 9.1.2.1 Custom Design With WEBENCH® Tools
    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 Electrostatic Discharge Caution
    7. 9.7 Glossary
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Tape and Reel Information

8.2.3 Application Curves

Unless otherwise specified the following conditions apply: VIN = 12.0V, TA = 25°C. Figure 8-25 shows the circuit with the appropriate BOM in Table 8-4

LMR36503E-Q1 Efficiency
VOUT = 3.V2.2MHz (AUTO)25°C
Figure 8-4 Efficiency
LMR36503E-Q1 Efficiency
VOUT = 5V2.2MHz (AUTO)25°C
Figure 8-6 Efficiency
LMR36503E-Q1 Efficiency
VOUT = 3.3V2.2MHz (AUTO)150°C
Figure 8-8 Efficiency
LMR36503E-Q1 Efficiency
VOUT = 5V2.2MHz (AUTO)150°C
Figure 8-10 Efficiency
LMR36503E-Q1 Line and Load RegulationFigure 8-12 Line and Load Regulation
LMR36503E-Q1 Load Transient
VOUT = 5V0.02A to 0.3A, 1A/µs2.2MHz (AUTO)
Figure 8-14 Load Transient
LMR36503E-Q1 Output Ripple
VOUT = 5VIOUT = 0A2.2MHz (AUTO)
Figure 8-16 Output Ripple
LMR36503E-Q1 Switching Frequency over Input Voltage
VOUT = 3.3V2200kHzFPWM
Figure 8-18 Switching Frequency over Input Voltage
LMR36503E-Q1 Switching Frequency Over Load Current
VOUT = 3.3VVIN = 13.5V
VOUT = 5VAUTO
Figure 8-20 Switching Frequency Over Load Current
LMR36503E-Q1 Typical CISPR 25 Conducted EMI 150kHz - 30MHz Yellow: Peak Detect, Blue = Average Detect
VIN = 13.5VVOUT = 5VFsw = 2.2MHz
Load = 0.3A
Figure 8-22 Typical CISPR 25 Conducted EMI 150kHz - 30MHz Yellow: Peak Detect, Blue = Average Detect
LMR36503E-Q1 Efficiency
VOUT = 3.V2.2MHz (FPWM)25°C
Figure 8-5 Efficiency
LMR36503E-Q1 Efficiency
VOUT = 5V2.2MHz (FPWM)25°C
Figure 8-7 Efficiency
LMR36503E-Q1 Efficiency
VOUT = 3.3V2.2MHz (FPWM)150°C
Figure 8-9 Efficiency
LMR36503E-Q1 Efficiency
VOUT = 5V2.2MHz (FPWM)150°C
Figure 8-11 Efficiency
LMR36503E-Q1 DropoutFigure 8-13 Dropout
LMR36503E-Q1 Load Transient
VOUT = 5V0.15A to 0.3A, 1A/µs2.2MHz (AUTO)
Figure 8-15 Load Transient
LMR36503E-Q1 Output Ripple
VOUT = 5VIOUT = 300mA2.2MHz (AUTO)
Figure 8-17 Output Ripple
LMR36503E-Q1 Switching Frequency over Input Voltage
VOUT = 5V2200kHzFPWM
Figure 8-19 Switching Frequency over Input Voltage
LMR36503E-Q1 Switching Frequency During Dropout
VOUT = 5VAUTO
Figure 8-21 Switching Frequency During Dropout
LMR36503E-Q1 Typical CISPR 25 Conducted EMI 30MHz - 108MHz Yellow: Peak Detect, Blue = Average Detect
VIN = 13.5VVOUT = 5VFsw = 2.2MHz
Load = 0.3A
Figure 8-23 Typical CISPR 25 Conducted EMI 30MHz - 108MHz Yellow: Peak Detect, Blue = Average Detect
LMR36503E-Q1 Typical Input EMI Filter for 2.2MHz
Ferrite bead part number: FBMH3225HM601NT
Figure 8-24 Typical Input EMI Filter for 2.2MHz
LMR36503E-Q1 Schematic for Typical Application CurvesFigure 8-25 Schematic for Typical Application Curves
Table 8-4 BOM for Typical Application Curves
U1ƒSWVOUTLNOMINAL COUT
(RATED CAPACITANCE)
LMR36503MSCERPERQ12200kHz3.3V6.8µH, 47.9mΩ2 × 22µF
LMR36503MSCERPERQ12200kHz5V6.8µH, 47.9mΩ2 × 22µF