SNVSBE0G October   2020  – May 2024 LMR43610-Q1 , LMR43620-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 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, and VOUT/FB Input
      6. 7.3.6  Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
      7. 7.3.7  Output Voltage Selection
      8. 7.3.8  Spread Spectrum
      9. 7.3.9  Soft Start and Recovery from Dropout
        1. 7.3.9.1 Recovery from Dropout
      10. 7.3.10 Current Limit and Short Circuit
      11. 7.3.11 Thermal Shutdown
      12. 7.3.12 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
    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
          1. 8.2.2.2.1 FB for Adjustable Output
        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  CBOOT
        7. 8.2.2.7  VCC
        8. 8.2.2.8  CFF Selection
        9. 8.2.2.9  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 Device Nomenclature
    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

8.2.3 Application Curves

Unless otherwise specified the following conditions apply: VIN = 12V, TA = 25°C.

LMR43610-Q1 LMR43620-Q1 Efficiency
LMR43620MSC3VOUT = 3.3V 2.2MHz (auto)
Fixed
Figure 8-3 Efficiency
LMR43610-Q1 LMR43620-Q1 Efficiency
LMR43610MSC5VOUT = 5V 2.2MHz (auto)
Fixed
Figure 8-5 Efficiency
LMR43610-Q1 LMR43620-Q1 Efficiency
LMR43610RS3VOUT = 3.3V 1MHz (auto)
Fixed
Figure 8-7 Efficiency
LMR43610-Q1 LMR43620-Q1 Dropout
LMR43620MSC3VOUT = 3.3V 2.2MHz (auto)
Fixed
Figure 8-9 Dropout
LMR43610-Q1 LMR43620-Q1 Line and Load Regulation
LMR43620MSC3VOUT = 3.3V 2.2MHz (auto)
Fixed
Figure 8-11 Line and Load Regulation
LMR43610-Q1 LMR43620-Q1 Input Switching Current vs. Input Voltage
LMR43620MSC3VOUT = 3.3V 2.2MHz (auto)
Fixed
Figure 8-13 Input Switching Current vs. Input Voltage
LMR43610-Q1 LMR43620-Q1 Load Transient
LMR43620MSC3VOUT = 3.3V 2.2MHz (auto)
0A to 2A,1A/µsFixed
Figure 8-15 Load Transient
LMR43610-Q1 LMR43620-Q1 Load Transient
LMR43620MSC3VOUT = 3.3V 2.2MHz (FPWM)
0A to 1A,1A/µsFixed
Figure 8-17 Load Transient
LMR43610-Q1 LMR43620-Q1 Load Transient
LMR43610MSC5VOUT = 5V 2.2MHz (FPWM)
0A to 1A,1A/µsFixed
Figure 8-19 Load Transient
LMR43610-Q1 LMR43620-Q1 Output Voltage Ripple
LMR43620MSC3VOUT = 3.3V 2A load
Fixed
Figure 8-21 Output Voltage Ripple
LMR43610-Q1 LMR43620-Q1 EVM Thermal Performance
LMR43620MSC3 24VIN, 2A, 2.2MHz
Fixed VOUT = 3.3V
Figure 8-23 EVM Thermal Performance
LMR43610-Q1 LMR43620-Q1 Typical CISPR 25 Conducted EMI 150kHz–30MHz Yellow: Peak Detect, Blue = Average Detect
VIN = 13.5V VOUT = 3.3V fSW = 2.2MHz
Load = 2A
Figure 8-25 Typical CISPR 25 Conducted EMI 150kHz–30MHz Yellow: Peak Detect, Blue = Average Detect
LMR43610-Q1 LMR43620-Q1 Typical CISPR 25 Radiated EMI 30MHz–300MHz Horizontal Bicon Antenna Blue: Peak Detect, Pink = Average Detect
VIN = 13.5VVOUT = 3.3V fSW = 2.2MHz
Load = 2A
Figure 8-27 Typical CISPR 25 Radiated EMI 30MHz–300MHz Horizontal Bicon Antenna Blue: Peak Detect, Pink = Average Detect
LMR43610-Q1 LMR43620-Q1 Efficiency
LMR43620MSC3VOUT = 3.3V 2.2MHz (FPWM)
Fixed
Figure 8-4 Efficiency
LMR43610-Q1 LMR43620-Q1 Efficiency
LMR43610MSC5VOUT = 5V 2.2MHz (FPWM)
Fixed
Figure 8-6 Efficiency
LMR43610-Q1 LMR43620-Q1 Efficiency
LMR43610RS3VOUT = 3.3V 400kHz (auto)
Fixed
Figure 8-8 Efficiency
LMR43610-Q1 LMR43620-Q1 Dropout
LMR43610MSC5VOUT = 5V 2.2MHz (auto)
Fixed
Figure 8-10 Dropout
LMR43610-Q1 LMR43620-Q1 Line and Load Regulation
LMR43610MSC5VOUT = 5V 2.2MHz (auto)
Fixed
Figure 8-12 Line and Load Regulation
LMR43610-Q1 LMR43620-Q1 Input Current vs. Load Current
LMR43620MSC3VOUT = 3.3V 2.2MHz (auto)
Fixed
Figure 8-14 Input Current vs. Load Current
LMR43610-Q1 LMR43620-Q1 Load Transient
LMR43620MSC3VOUT = 3.3V 2.2MHz (auto)
0.5A to 1.5A,1A/µs Fixed
Figure 8-16 Load Transient
LMR43610-Q1 LMR43620-Q1 Load Transient
LMR43620MSC3VOUT = 3.3V 2.2MHz (auto)
0A to 1A,1A/µsFixed
Figure 8-18 Load Transient
LMR43610-Q1 LMR43620-Q1 Load Transient
LMR43610MSC5VOUT = 5V 2.2MHz (auto)
0A to 1A,1A/µsFixed
Figure 8-20 Load Transient
LMR43610-Q1 LMR43620-Q1 Output Voltage Ripple
LMR43620MSC3VOUT = 3.3V No load
Fixed
Figure 8-22 Output Voltage Ripple
LMR43610-Q1 LMR43620-Q1 EVM Thermal Performance
LMR43620MSC3 24VIN, 2A, 2.2MHz
Fixed VOUT = 3.3V
Figure 8-24 EVM Thermal Performance
LMR43610-Q1 LMR43620-Q1 Typical CISPR 25 Conducted EMI 30MHz–108MHz Yellow: Peak Detect, Blue = Average Detect
VIN = 13.5V VOUT = 3.3V fSW = 2.2MHz
Load = 2A
Figure 8-26 Typical CISPR 25 Conducted EMI 30MHz–108MHz Yellow: Peak Detect, Blue = Average Detect
LMR43610-Q1 LMR43620-Q1 Typical CISPR 25 Radiated EMI 30MHz–300MHz Vertical Bicon Antenna Blue: Peak Detect, Pink = Average Detect
VIN = 13.5VVOUT = 3.3V fSW = 2.2MHz
Load = 2A
Figure 8-28 Typical CISPR 25 Radiated EMI 30MHz–300MHz Vertical Bicon Antenna Blue: Peak Detect, Pink = Average Detect
LMR43610-Q1 LMR43620-Q1 Typical Input EMI Filter
Ferrite Bead Part Number: FBMH3225HM601NT Alternate Ferrite Bead Part Number: FBMH3225HM102N
Figure 8-29 Typical Input EMI Filter
LMR43610-Q1 LMR43620-Q1 Example Application Circuit
A. The RT pin is factory-set for externally adjustable switching frequency RT variants only. Tying this pin to GND results in 2.2MHz switching frequency. See Section 7.3.3 for details.
B. The MODE/SYNC pin is factory-set for fixed frequency MODE/SYNC variants only. Tying this pin to GND results in auto mode. See Section 7.3.2 for details.
Figure 8-30 Example Application Circuit
Table 8-5 BOM for Typical Application Curves
U1ƒSWVOUTLNOMINAL COUT
(RATED CAPACITANCE)		RFBTRFBBCFF
LMR43620MSC3RPERQ12200kHz3.3V Fixed3.3µH, 26mΩ2 × 22µF0ΩDNPDNP
LMR43610MSC5RPERQ12200kHz5V Fixed3.3µH, 26mΩ2 × 22µF0ΩDNPDNP
LMR43610RS3QRPERQ11000kHz3.3V Fixed3.3µH, 26mΩ2 × 22µF0ΩDNPDNP
LMR43610RS3QRPERQ1400kHz3.3V Fixed10µH, 18.5mΩ2 × 22µF0ΩDNPDNP