SNVSB91C July   2019  – June 2020 LMR36506-Q1

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
      2.      Efficiency versus Output Current VOUT = 3.3 V (Fixed), 2.2 MHz
  4. 4 Revision History
  5. 5 Device Comparison Table
  6. 6 Pin Configuration and Functions
    1.     Pin Functions
  7. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD (Automotive) 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  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 UVLO, and VOUT/BIAS Input
      6. 8.3.6  Bootstrap Voltage and VCBOOT-UVLO (CBOOT Terminal)
      7. 8.3.7  Output Voltage Selection
      8. 8.3.8  Spread Spectrum
      9. 8.3.9  Soft Start and Recovery from Dropout
        1. 8.3.9.1 Recovery from Dropout
      10. 8.3.10 Current Limit and Short Circuit
      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
          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 What to Do and What Not to Do
  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

Unless otherwise specified the following conditions apply: VIN = 13.5V, TA = 25°C.
LMR36506-Q1 LMR36506MSC3_Brd1F_Efficiency_2p2MHz_PFM.gif
LMR36506MSC3 VOUT = 3.3 V Fixed 2.2 MHz (AUTO)
Figure 33. Efficiency
LMR36506-Q1 LMR36506MSC5_Brd_2F_Efficiency_2p2MHz_PFM.gif
LMR36506MSC5 VOUT = 5 V Fixed 2.2 MHz (AUTO)
Figure 35. Efficiency
LMR36506-Q1 LMR36506RS3_Brd7_Efficiency_400kHz_PFM_33uH_105m_47uF.gif
LMR36506RS3 VOUT = 3.3 V Fixed 400 kHz (AUTO)
Figure 37. Efficiency
LMR36506-Q1 Load_Regulation_LMR36506MSC3_Brd1F_2p2MHz_PFM.gif
LMR36506MSC3 VOUT = 3.3 V Fixed 2.2 MHz (AUTO)
Figure 39. Line and Load Regulation
LMR36506-Q1 Dropout_LMR36506MSC3_Brd1F_2p2MHz_PFM.gif
LMR36506MSC3 VOUT = 3.3 V Fixed 2.2 MHz (AUTO)
Figure 41. Dropout
LMR36506-Q1 LoadTransient_13p5V_MSC3_0A_0p6A.gif
LMR36506MSC3 VOUT = 3.3 V Fixed 2.2 MHz
0 A to 0.6 A,1 A/µs
Figure 43. Load Transient
LMR36506-Q1 LoadTransient_13p5V_MSC5_0A_0p6A.gif
LMR36506MSC5 VOUT = 5 V Fixed 2.2 MHz
0 A to 0.6 A,1 A/µs
Figure 45. Load Transient
LMR36506-Q1 LoadTransient_13p5V_RS3_0A_0p6A.gif
LMR36506RS3 VOUT = 3.3 V Fixed 400 kHz
0 A to 0.6 A,1 A/µs
Figure 47. Load Transient
LMR36506-Q1 OutputRipple_MSC3_13p5V_NL.gif
LMR36506MSC3 VOUT = 3.3 V Fixed No Load
Figure 49. Output Ripple
LMR36506-Q1 SwitchingFrequency_Over_VIN_MSC3.gif
LMR36506MSC3 VOUT = 3.3 V Fixed 2200 kHz
FPWM
Figure 51. Switching Frequency over Input Voltage
LMR36506-Q1 SwitchingFrequency_Over_Load.gif
LMR36506MSC3 VOUT = 3.3 V Fixed VIN = 13.5 V
LMR36506MSC5 VOUT = 5 V Fixed AUTO
Figure 53. Switching Frequency over Load Current
LMR36506-Q1 Conducted_EMI_600mA_150kHz_30MHz_DS.png
VIN = 13.5 V VOUT = 5 V Fsw = 2.2 MHz
Load = 0.6 A
Figure 55. Typical CISPR 25 Conducted EMI
150kHz - 30MHz
Yellow: Peak Detect, Blue = Average Detect
LMR36506-Q1 LMR36506MSC3_Brd1F_Efficiency_2p2MHz_FPWM.gif
LMR36506MSC3 VOUT = 3.3 V Fixed 2.2 MHz (FPWM)
Figure 34. Efficiency
LMR36506-Q1 LMR36506MSC5_Brd2F_Efficiency_2p2MHz_FPWM.gif
LMR36506MSC5 VOUT = 5 V Fixed 2.2 MHz (FPWM)
Figure 36. Efficiency
LMR36506-Q1 Load_Regulation_LMR36506RS3_Brd7_400kHz_PFM_33uH_105m_47uF.gif
LMR36506RS3 VOUT = 3.3 V Fixed 400 kHz (AUTO)
Figure 38. Line and Load Regulation
LMR36506-Q1 Load_Regulation_LMR36506MSC5_Brd_2F_2p2MHz_PFM.gif
LMR36506MSC5 VOUT = 5 V Fixed 2.2 MHz (AUTO)
Figure 40. Line and Load Regulation
LMR36506-Q1 Dropout_LMR36506MSC5_Brd2F_2p2MHz_PFM.gif
LMR36506MSC5 VOUT = 5 V Fixed 2.2 MHz (AUTO)
Figure 42. Dropout
LMR36506-Q1 LoadTransient_13p5V_MSC3_0p3A_0p6A.gif
LMR36506MSC3 VOUT = 3.3 V Fixed 2.2 MHz
0.3 A to 0.6 A,1 A/µs
Figure 44. Load Transient
LMR36506-Q1 LoadTransient_13p5V_MSC5_0p3A_0p6A.gif
LMR36506MSC5 VOUT = 5 V Fixed 2.2 MHz
0.3 A to 0.6 A,1 A/µs
Figure 46. Load Transient
LMR36506-Q1 LoadTransient_13p5V_RS3_0p3A_0p6A.gif
LMR36506RS3 VOUT = 3.3 V Fixed 400 kHz
0.3 A to 0.6 A,1 A/µs
Figure 48. Load Transient
LMR36506-Q1 OutputRipple_MSC5_13p5V_NL.gif
LMR36506MSC5 VOUT = 5 V Fixed No Load
Figure 50. Output Ripple
LMR36506-Q1 SwitchingFrequency_Over_VIN_MSC5.gif
LMR36506MSC5 VOUT = 5 V Fixed 2200 kHz
FPWM
Figure 52. Switching Frequency over Input Voltage
LMR36506-Q1 LMR36506MSC5_Frequency_Dropout.gif
LMR36506MSC5 VOUT = 5 V Fixed AUTO
Figure 54. Switching Frequency during Dropout
LMR36506-Q1 Conducted_EMI_600mA_30MHz_108MHz_DS.png
VIN = 13.5 V VOUT = 5 V Fsw = 2.2 MHz
Load = 0.6 A
Figure 56. Typical CISPR 25 Conducted EMI
30MHz - 108MHz
Yellow: Peak Detect, Blue = Average Detect
LMR36506-Q1 Input_Filter_MSCEVM.gif
Ferrite Bead Part Number: FBMH3225HM601NT
Figure 57. Typical Input EMI Filter
LMR36506-Q1 Typical_Apps_Circuit_LMR36506Q1-BOM.gifFigure 58. Schematic for Typical Application Curves

Table 6. BOM for Typical Application Curves

U1 ƒSW VOUT L NOMINAL COUT
(RATED CAPACITANCE)
LMR36506MSC3RPERQ1 2200 kHz 3.3 V 6.8 µH. 74 mΩ 1 × 22 µF
LMR36506MSC5RPERQ1 2200 kHz 5 V 6.8 µH. 74 mΩ 1 × 22 µF
LMR36506RS3QRPERQ1 400 kHz 3.3 V 33 µH. 105 mΩ 1 x 47 µF