SNVSBY5B december   2020  – may 2023 LMR43610 , LMR43620

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 System Characteristics
    7. 7.7 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  Enable, Start-Up, and Shutdown
      2. 8.3.2  External CLK SYNC (with MODE/SYNC)
        1. 8.3.2.1 Pulse-Dependent MODE/SYNC Pin Control
      3. 8.3.3  Adjustable Switching Frequency (with RT)
      4. 8.3.4  Power-Good Output Operation
      5. 8.3.5  Internal LDO, VCC, and VOUT/FB Input
      6. 8.3.6  Bootstrap Voltage and VBOOT-UVLO (BOOT Terminal)
      7. 8.3.7  Output Voltage Selection
      8. 8.3.8  Soft Start and Recovery from Dropout
        1. 8.3.8.1 Recovery from Dropout
      9. 8.3.9  Current Limit and Short Circuit
      10. 8.3.10 Thermal Shutdown
      11. 8.3.11 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
          1. 9.2.2.2.1 FB for Adjustable Output
        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 CBOOT
        7. 9.2.2.7 VCC
        8. 9.2.2.8 CFF Selection
          1. 9.2.2.8.1 External UVLO
        9. 9.2.2.9 Maximum Ambient Temperature
      3. 9.2.3 Application Curves
    3. 9.3 Best Design Practices
    4. 9.4 Power Supply Recommendations
    5. 9.5 Layout
      1. 9.5.1 Layout Guidelines
        1. 9.5.1.1 Ground and Thermal Considerations
      2. 9.5.2 Layout Example
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Third-Party Products Disclaimer
      2. 10.1.2 Device Nomenclature
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Support Resources
    4. 10.4 Trademarks
    5. 10.5 Electrostatic Discharge Caution
    6. 10.6 Glossary
  11. 11Mechanical, Packaging, and Orderable Information

Package Options

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

9.2.3 Application Curves

Unless otherwise specified the following conditions apply: VIN = 24 V, TA = 25°C.

GUID-20230413-SS0I-XW37-MTLL-NMNL34PN5RJQ-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (auto)
Fixed
Figure 9-3 Efficiency
GUID-20230417-SS0I-NG9N-WTQK-CHHV5BRXNQM2-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (auto)
Fixed
Figure 9-5 Line and Load Regulation
GUID-20230417-SS0I-G7ZF-G1XN-0XPPQT114MQN-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (auto)
Fixed IOUT = 100 mA
Figure 9-7 Start-up
GUID-20230417-SS0I-FPFZ-R9ZP-KGNMFCJ746QL-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (auto)
Fixed IOUT = 1 A to 2 A,1 A/µs
Figure 9-9 Load Transient
GUID-20230503-SS0I-R9KR-DLW5-CXXD0JLCS6PM-low.svg
LMR43620MB5 VOUT = 5 V auto mode
Fixed VIN = 24 V IOUT = 2 A to Short Circuit
Figure 9-11 Short-Circuit Protection
GUID-20230503-SS0I-6JTH-PWGT-6FG37CL653D4-low.svg
LMR43620MB5 VOUT = 5 V auto mode
Fixed VIN = 24 V IOUT = Short Circuit to 2 A
Figure 9-13 Short-Circuit Recovery
GUID-20230418-SS0I-0XFH-F0HT-ZW75W421WDQB-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (auto)
Fixed VIN = 24 V IOUT = Open
Figure 9-15 Output Voltage Ripple
GUID-20230413-SS0I-WTL5-7SHP-SFQLSG7WFRVV-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz
Fixed VIN = 24 V IOUT = 2 A
Figure 9-17 EVM Thermal Performance
GUID-20230417-SS0I-J5WW-H74X-73PKWNM9VP1P-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz
Fixed VIN = 24 V IOUT = 2 A
Figure 9-19 Typical CISPR 32 Conducted EMI 30 MHz – 108 MHz Yellow: Peak Detect, Green = Average Detect
GUID-20230417-SS0I-3RC4-B6QN-NWXXHBMJDSPF-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (auto)
Fixed
Figure 9-4 Dropout
GUID-20230417-SS0I-9FLL-TL33-4XXTFVWMJFHS-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (auto)
Fixed
Figure 9-6 Input Switching Current vs Input Voltage
GUID-20230417-SS0I-CPQJ-XPCL-XLWKNWR5TBSW-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (auto)
Fixed IOUT = 0 A to 2 A,1 A/µs
Figure 9-8 Load Transient
GUID-20230417-SS0I-35NZ-JQLF-QWJQRLLPSTP5-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (FPWM)
Fixed IOUT = 0 A to 2 A,1 A/µs
Figure 9-10 Load Transient
GUID-20230503-SS0I-HFB6-PQTL-B5SJLHNWDDXS-low.svg
LMR43620MB5 VOUT = 5 V auto mode
Fixed VIN = 24 V IOUT = Short Circuit
Figure 9-12 Short-Circuit Performance
GUID-20230417-SS0I-HPJ4-LJXZ-JNPFVTLPKGSH-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz (auto)
Fixed VIN = 24 V IOUT = 2 A
Figure 9-14 Output Voltage Ripple
GUID-20230417-SS0I-JFXX-ZHCV-GQDPDJHG9PDK-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz
Fixed VIN = 12 V IOUT = 2 A
Figure 9-16 EVM Thermal Performance
GUID-20230417-SS0I-NJMF-5C2T-BFZJVC839DQD-low.svg
LMR43620MB5 VOUT = 5 V fSW = 1 MHz
Fixed VIN = 24 V IOUT = 2 A
Figure 9-18 Typical CISPR 32 Conducted EMI 150 kHz – 30 MHz Yellow: Peak Detect, Green = Average Detect
GUID-20230428-SS0I-4WXD-ZDN5-XD9RLQM1JSWN-low.svg Figure 9-20 Typical Input EMI Filter
GUID-20220215-SS0I-JXVG-LVGJ-DLXVFP3TZQPR-low.svg
A. The RT pin is factory-set for externally adjustable switching frequency RT variants only. Tying this pin to VCC results in 1-MHz switching frequency. See Section 8.3.3 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 8.3.2 for details.
Figure 9-21 Example Application Circuit
Table 9-7 BOM for Typical Application Curves
U1 ƒSW VOUT L NOMINAL COUT
(RATED CAPACITANCE)		 RFBT RFBB CFF
LMR43620MB5RPER 1000 kHz 5 V Fixed 3.3 µH, 26 mΩ 2 × 22 µF 0 Ω DNP DNP