SNVSA44B August   2014  – January 2018 LM43601

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Schematic
      2.      Radiated Emission Graph VIN = 12 V, VOUT = 3.3 V, FS= 500 kHz, IOUT = 1 A
  4. 4 Revision History
  5. 5 Pin Configuration and Functions
    1.     Pin Functions
  6. 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 Timing Requirements
    7. 6.7 Switching Characteristics
    8. 6.8 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Fixed-Frequency, Peak-Current-Mode Controlled, Step-Down Regulator
      2. 7.3.2  Light Load Operation
      3. 7.3.3  Adjustable Output Voltage
      4. 7.3.4  Enable (ENABLE)
      5. 7.3.5  VCC, UVLO and BIAS
      6. 7.3.6  Soft Start and Voltage Tracking (SS/TRK)
      7. 7.3.7  Switching Frequency (RT) and Synchronization (SYNC)
      8. 7.3.8  Minimum ON-Time, Minimum OFF-Time, and Frequency Foldback at Dropout Conditions
      9. 7.3.9  Internal Compensation and CFF
      10. 7.3.10 Bootstrap Voltage (BOOT)
      11. 7.3.11 Power Good (PGOOD)
      12. 7.3.12 Overcurrent and Short-Circuit Protection
      13. 7.3.13 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Shutdown Mode
      2. 7.4.2 Standby Mode
      3. 7.4.3 Active Mode
      4. 7.4.4 CCM Mode
      5. 7.4.5 Light Load Operation
      6. 7.4.6 Self-Bias Mode
  8. 8 Applications 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  Custom Design With WEBENCH® Tools
        2. 8.2.2.2  Output Voltage Setpoint
        3. 8.2.2.3  Switching Frequency
        4. 8.2.2.4  Input Capacitors
        5. 8.2.2.5  Inductor Selection
        6. 8.2.2.6  Output Capacitor Selection
        7. 8.2.2.7  Feedforward Capacitor
        8. 8.2.2.8  Bootstrap Capacitors
        9. 8.2.2.9  VCC Capacitor
        10. 8.2.2.10 BIAS Capacitors
        11. 8.2.2.11 Soft-Start Capacitors
        12. 8.2.2.12 Undervoltage Lockout Set-Point
        13. 8.2.2.13 PGOOD
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Compact Layout for EMI Reduction
      2. 10.1.2 Ground Plane and Thermal Considerations
      3. 10.1.3 Feedback Resistors
    2. 10.2 Layout Example
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
    2. 11.2 Receiving Notification of Documentation Updates
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

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

8.2.3 Application Curves

See Table 2 for bill of materials for each VOUT and FS combination. Unless otherwise stated, application performance curves were taken at TA = 25°C.
LM43601 Sch_BOM_1V500k.gif
VOUT = 1 V FS = 500 kHz VIN = 12 V
Figure 47. BOM for VOUT = 1 V FS = 500 kHz
LM43601 C011_Reg_43601_1V500k.png
VOUT = 1 V FS = 500 kHz
Figure 49. Output Voltage Regulation
LM43601 12VIN_1VO_500k_100mATO1A.gif
VOUT = 1 V FS = 500 kHz VIN = 12 V
Figure 51. Load Transient Between 0.1 A and 1 A
LM43601 Sch_BOM_3.3V500k.gif
VOUT = 3.3 V FS = 500 kHz VIN = 12 V
Figure 53. BOM for VOUT = 3.3 V FS = 500 kHz
LM43601 C012_Reg_43601_3p3V500k.png
VOUT = 3.3 V FS = 500 kHz
Figure 55. Output Voltage Regulation
LM43601 12VIN_3p3VO_500k_100mATO1A.gif
VOUT = 3.3 V FS = 500 kHz VIN = 12 V
Figure 57. Load Transient Between 0.1 A and 1 A
LM43601 Sch_BOM_5V500k.gif
VOUT = 5 V FS = 500 kHz VIN = 12 V
Figure 59. BOM for VOUT = 5 V FS = 500 kHz
LM43601 C013_Reg_43601_5V500k.png
VOUT = 5 V FS = 500 kHz
Figure 61. Output Voltage Regulation
LM43601 12VIN_5VO_500k_100mATO1A.gif
VOUT = 5 V FS = 500 kHz VIN = 12 V
Figure 63. Load Transient Between 0.1 A and 1 A
LM43601 Sch_BOM_5V200k.gif
VOUT = 5 V FS = 200 kHz VIN = 12 V
Figure 65. BOM for VOUT = 5 V FS = 200 kHz
LM43601 C014_Reg_43601_5V200k.png
VOUT = 5 V FS = 200 kHz
Figure 67. Output Voltage Regulation
LM43601 12VIN_5VO_200k_100mATO1A.gif
VOUT = 5 V FS = 200 kHz VIN = 12 V
Figure 69. Load Transient Between 0.1 A and 1 A
LM43601 Sch_BOM_5V1M.gif
VOUT = 5 V FS = 1 MHz VIN = 12 V
Figure 71. BOM for VOUT = 5 V FS = 1 MHz
LM43601 C015_Reg_43601_5V1M.png
VOUT = 5 V FS = 1 MHz
Figure 73. Output Voltage Regulation
LM43601 12VIN_5VO_1M_100mATO1A.gif
VOUT = 5 V FS = 1 MHz VIN = 12 V
Figure 75. Load Transient Between 0.1 A and 1 A
LM43601 Sch_BOM_5V2p2M.gif
A.
VOUT = 5 V FS = 1 MHz VIN = 12 V
Figure 77. BOM for VOUT = 5 V FS = 2.2 MHz
LM43601 C016_Reg_43601_5V2p2M.png
A.
VOUT = 5 V FS = 2.2 MHz
Figure 79. Output Voltage Regulation
LM43601 12VIN_5VO_2p2M_100mATO1A.gif
A.
VOUT = 5 V FS = 2.2 MHz VIN = 12 V
Figure 81. Load Transient Between 0.1 A and 1 A
LM43601 Sch_BOM_12V500k.gif
VOUT = 12 V FS = 500 kHz VIN = 24 V
Figure 83. BOM for VOUT = 12 V FS = 500 kHz
LM43601 C017_Reg_43601_12V500k.png
VOUT = 12 V FS = 500 kHz
Figure 85. Output Voltage Regulation
LM43601 24VIN_12VO_500k_100mATO1A.gif
VOUT = 12 V FS = 500 kHz VIN = 24 V
Figure 87. Load Transient Between 0.1 A and 1 A
LM43601 3p3VO_500kThetaJA20CpW.png
VOUT = 3.3 V FS = 500 kHz RθJA = 20°C/W
Figure 89. Derating Curve with RθJA = 20°C/W
LM43601 5VO_200kThetaJA20CpW.png
i.
VOUT = 5 V FS = 200 kHz RθJA = 20°C/W
Figure 91. Derating Curve with RθJA = 20°C/W
LM43601 43601_3p3V_500kHz_FreqPFM.png
VOUT = 3.3 V FS = 500 kHz
Figure 93. Switching Frequency vs IOUT in PFM Operation
LM43601 12VIN_3V3_500k_1A_CCM.gif
VOUT = 3.3 V FS = 500 kHz IOUT = 1A
Figure 95. Switching Waveform in CCM Operation
LM43601 12VIN_3V3_500k_10mA_PFM.gif
VOUT = 3.3 V FS = 500 kHz IOUT = 10 mA
Figure 97. Switching Waveform in PFM Operation
LM43601 12VIN_3p3VO_500k_500mA.gif
VIN = 12 V VOUT = 3.3 V RLOAD = 6.6 Ω
Figure 99. Start-up Into Half Load With Internal Soft-Start Rate
LM43601 12VIN_3p3VO_500k_PREBIAS_1V.gif
VIN = 12V VOUT = 3.3 V RLOAD = Open
Figure 101. Start-up Into 1-V Pre-biased Voltage
LM43601 12TO36V_3V3_500k_1A_1V1us.gif
VOUT = 3.3 V FS = 500 kHz IOUT = 1 A
Figure 103. Line Transient: VIN Transitions Between 12 V and 36 V
LM43601 12VIN_3p3VO_500k_SHORT_RECOVERY.gif
VOUT = 3.3 V FS = 500 kHz VIN = 12 V
Figure 105. Short-Circuit Protection and Recover
LM43601 C001_Eff_43601_1V500k.png
VOUT = 1 V FS = 500 kHz
Figure 48. Efficiency
LM43601 12VIN_1VO_500k_100mATO1A.gif
VOUT = 1 V FS = 500 kHz VIN = 12 V
Figure 50. Load Transient Between 0.05 A and 1 A
LM43601 12V_1VO_500kThetaJA.png
VOUT = 1 V FS = 500 kHz VIN = 12 V
Figure 52. Derating Curve
LM43601 C002_Eff_43601_3p3V500k.png
VOUT = 3.3 V FS = 500 kHz
Figure 54. Efficiency
LM43601 C022_DO_43601_3p3V500k.png
VOUT = 3.3 V FS = 500 kHz
Figure 56. Dropout Curve
LM43601 12V_3p3VO_500kThetaJA.png
VOUT = 3.3 V FS = 500 kHz VIN = 12 V
Figure 58. Derating Curve
LM43601 C003_Eff_43601_5V500k.png
VOUT = 5 V FS = 500 kHz
Figure 60. Efficiency
LM43601 C023_DO_43601_5V500k.png
VOUT = 5 V FS = 500 kHz
Figure 62. Dropout Curve
LM43601 12V_5VO_500kThetaJA.png
VOUT = 5 V FS = 500 kHz VIN = 12 V
Figure 64. Derating Curve
LM43601 C004_Eff_43601_5V200k.png
VOUT = 5 V FS = 200 kHz
Figure 66. Efficiency
LM43601 C024_DO_43601_5V200k.png
VOUT = 5 V FS = 200 kHz
Figure 68. Dropout Curve
LM43601 12V_5VO_200kThetaJA.png
VOUT = 5 V FS = 200 kHz
Figure 70. Derating Curve
LM43601 C005_Eff_43601_5V1M.png
VOUT = 5 V FS = 1 MHz VIN = 12 V
Figure 72. Efficiency
LM43601 C025_DO_43601_5V1M.png
VOUT = 5 V FS = 1 MHz
Figure 74. Dropout Curve
LM43601 12V_5VO_1000kThetaJA.png
VOUT = 5 V FS = 1 MHz VIN = 12 V
Figure 76. Derating Curve
LM43601 C006_Eff_43601_5V2p2M.png
A.
VOUT = 5 V FS = 2.2 MHz VIN = 12 V
Figure 78. Efficiency
LM43601 C026_DO_43601_5V2p2M.png
A.
VOUT = 5 V FS = 2.2 MHz
Figure 80. Dropout Curve
LM43601 12V_5VO_2200kThetaJA.png
A.
VOUT = 5 V FS = 2.2 MHz VIN = 12 V
Figure 82. Derating Curve
LM43601 C007_Eff_43601_12V500k.png
VOUT = 12 V FS = 500 kHz
Figure 84. Efficiency
LM43601 C027_DO_43601_12V500k.png
VOUT = 12 V FS = 500 kHz
Figure 86. Dropout Curve
LM43601 24V_12VO_500kThetaJA.png
VOUT = 12 V FS = 500 kHz VIN = 24 V
Figure 88. Derating Curve
LM43601 5VO_500kThetaJA20CpW.png
VOUT = 5 V FS = 500 kHz RθJA = 20°C/W
Figure 90. Derating Curve with RθJA = 20°C/W
LM43601 5VO_1000kThetaJA20CpW.png
VOUT = 5 V FS = 1 MHz RθJA = 20°C/W
Figure 92. Derating Curve with RθJA = 20°C/W
LM43601 43601_5V_1MHz_FreqPFM.png
VOUT = 5 V FS = 1 MHz
Figure 94. Switching Frequency vs IOUT in PFM Operation
LM43601 12VIN_3V3_500k_40mA_DCM.gif
VOUT = 3.3 V FS = 500 kHz IOUT = 40 mA
Figure 96. Switching Waveform in DCM Operation
LM43601 12VIN_3p3VO_500k_1A.gif
VIN = 12V VOUT = 3.3 V RLOAD = 3.3 Ω
Figure 98. Start-up Into Full Load With Internal Soft-Start Rate
LM43601 12VIN_3p3VO_500k_100mA.gif
VIN = 12 V VOUT = 3.3 V RLOAD = 33 Ω
Figure 100. Start-up Into 100 mA With Internal Soft-Start Rate
LM43601 24VIN_12VO_500k_1A_33nFCss.gif
VIN = 24 V VOUT = 12 V RLOAD = 12 Ω
Figure 102. Start-up With External Capacitor CSS = 33 nF
LM43601 12TO36V_3V3_500k_500mA_1V1us.gif
VOUT = 3.3 V FS = 500 kHz IOUT = 0.5 A
Figure 104. Line Transient: VIN Transitions Between 12 V and 36 V