SNVSBB6B December   2019  – December 2022 LMR36506

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 (Commercial) 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 Switching Characteristics
    8. 7.8 System Characteristics
    9. 7.9 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  Adjustable Switching Frequency (with RT)
      3. 8.3.3  Power-Good Output Operation
      4. 8.3.4  Internal LDO, VCC UVLO, and VOUT/BIAS Input
      5. 8.3.5  Bootstrap Voltage and VCBOOT-UVLO (CBOOT Terminal)
      6. 8.3.6  Output Voltage Selection
      7. 8.3.7  Soft Start and Recovery from Dropout
        1. 8.3.7.1 Recovery from Dropout
      8. 8.3.8  Current Limit and Short Circuit
      9. 8.3.9  Thermal Shutdown
      10. 8.3.10 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 Documentation Support
      1. 10.1.1 Related Documentation
    2. 10.2 Receiving Notification of Documentation Updates
    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 = 24V, TA = 25°C.
Unless otherwise specified the following conditions apply: VIN = 24V, TA = 25°C.GUID-33F8C2DE-F74A-44CC-B20F-A90E75EB1926-low.gif
LMR36506R3VOUT = 3.3 V Fixed1 MHz (AUTO)
Figure 9-4 Efficiency. Unless otherwise specified the following conditions apply: VIN = 24V, TA = 25°C.
GUID-ECB94AB0-900C-4D94-808B-D24517155597-low.gif
LMR36506RVOUT = 5 V400 kHz (AUTO)
Figure 9-6 Efficiency
GUID-20201202-CA0I-VZSP-8ZVC-GKVXSM7MD2Q2-low.gif
LMR36506R5 VOUT = 5 V Fixed 1 MHz (AUTO)
Figure 9-8 Efficiency
GUID-9C583C04-6424-419A-B2B5-C19E38C3E900-low.gif
LMR36506R3VOUT = 3.3 V Fixed1 MHz (AUTO)
Figure 9-10 Dropout
GUID-20201203-CA0I-LDQV-JC8J-WPRPK4JTQ2M1-low.gif
LMR36506R3 VOUT = 3.3 V Fixed 1 MHz
0 A to 0.6 A,1 A/µs
Figure 9-12 Load Transient
GUID-20201203-CA0I-9KJV-B8VN-R1NHPVJHQJSZ-low.gif
LMR36506R VOUT = 5 V Fixed 400 kHz
0 A to 0.6 A,1 A/µs
Figure 9-14 Load Transient
GUID-20201203-CA0I-7BPM-NL16-JT8NCRJ078MC-low.gif
LMR36506R3 VOUT = 3.3V Fixed No Load
Figure 9-16 Output Ripple
GUID-012F212D-9B83-4D63-9EC0-C128E20235AD-low.gif
LMR36506R VOUT = 3.3 V Fixed 1 MHz (AUTO)
Figure 9-5 Line and Load Regulation
GUID-EF0B875D-ADCF-41F8-BF12-8F01DC70EC98-low.gif
LMR36506R VOUT = 5 V 400 kHz (AUTO)
Figure 9-7 Line and Load Regulation
GUID-20201202-CA0I-BBPT-4CGF-XNBTZJNGLVP5-low.gif
LMR36506R5 VOUT =5 V 1 MHz (AUTO)
Figure 9-9 Line and Load Regulation
GUID-3102A5C0-67B7-46B9-AEEC-1A0A199A5506-low.gif
LMR36506RVOUT = 5 V400 kHz (AUTO)
Figure 9-11 Dropout
GUID-20201203-CA0I-1CJM-T54K-DJFKWCQTRJ1Z-low.gif
LMR36506R3 VOUT = 3.3 V Fixed 1 MHz
0.3 A to 0.6 A,1 A/µs
Figure 9-13 Load Transient
GUID-20201203-CA0I-TXZ9-GL23-TK4NBQFHTCW4-low.gif
LMR36506R VOUT = 5 V Fixed 400 kHz
0.3 A to 0.6 A,1 A/µs
Figure 9-15 Load Transient
GUID-20201203-CA0I-7NCZ-N4XQ-ZHWZZCLHLBWN-low.gif
LMR36506R VOUT = 5V Load = 0.6A
400kHz
Figure 9-17 Output Ripple
GUID-20201215-CA0I-5M2S-M7HG-XKK4KVS7JRHB-low.gif Figure 9-18 Schematic for Typical Application Curves
Table 9-3 BOM for Typical Application Curves
U1 ƒSW VOUT L NOMINAL COUT
(RATED CAPACITANCE)		 RT pin RFBT RFBB
LMR36506R3RPER 1000 kHz 3.3 V (Fixed) 15 µH, 260 mΩ 2 × 22 µF Short to VCC 0 Ω Open
LMR36506RRPER 400 kHz 5 V 47 µH, 68.4 mΩ 2× 22 µF 39.2 kΩ 100 kΩ 24.9 kΩ
LMR36506R5RPER 1000 kHz 5 V (Fixed) 22 µH, 99.65 mΩ 2 x 22 µF Short to VCC 0 Ω Open