ZHCSH05A October   2017  – October 2019 LM76002 , LM76003

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     简化原理图
    2.     效率与输出电流（VOUT = 5V，fSW = 400kHz，自动模式）
  4. 4 修订历史记录
  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 Characteristics
    7. 6.7 Switching Characteristics
    8. 6.8 System Characteristics
    9. 6.9 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 Control
      2. 7.3.2  Light Load Operation Modes — PFM and FPWM
      3. 7.3.3  Adjustable Output Voltage
      4. 7.3.4  Enable (EN Pin) and UVLO
      5. 7.3.5  Internal LDO, VCC UVLO, and Bias Input
      6. 7.3.6  Soft Start and Voltage Tracking (SS/TRK)
      7. 7.3.7  Adjustable Switching Frequency (RT) and Frequency Synchronization
      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 and VBOOT UVLO (BOOT Pin)
      11. 7.3.11 Power Good and Overvoltage Protection (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 DCM Mode
      6. 7.4.6 Light Load Mode
      7. 7.4.7 Foldback Mode
      8. 7.4.8 Forced Pulse-Width-Modulation Mode
      9. 7.4.9 Self-Bias Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Applications
      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  Feed-Forward Capacitor
        8. 8.2.2.8  Bootstrap Capacitors
        9. 8.2.2.9  VCC Capacitors
        10. 8.2.2.10 BIAS Capacitors
        11. 8.2.2.11 Soft-Start Capacitors
        12. 8.2.2.12 Undervoltage Lockout Setpoint
        13. 8.2.2.13 PGOOD
        14. 8.2.2.14 Synchronization
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
      1. 10.1.1 Layout Highlights
      2. 10.1.2 Compact Layout for EMI Reduction
      3. 10.1.3 Ground Plane and Thermal Considerations
      4. 10.1.4 Feedback Resistors
    2. 10.2 Layout Example
    3. 10.3 Thermal Design
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 开发支持
        1. 11.1.1.1 使用 WEBENCH® 工具创建定制设计
    2. 11.2 接收文档更新通知
    3. 11.3 支持资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 Glossary
  12. 12机械、封装和可订购信息

8.2.3 Application Curves

Unless otherwise specified the following conditions apply:
LM76002 LM76003 D011-LM76003-eff-3v3-500k-a-snvsak0.gif
VOUT = 3.3 V fSW = 500 kHz Auto Mode
Figure 23. LM76003 Efficiency
LM76002 LM76003 D014-LM76003-eff-5v0-500k-a-snvsak0.gif
VOUT = 5 V fSW = 500 kHz Auto Mode
Figure 25. LM76003 Efficiency
LM76002 LM76003 D016-LM76003-eff-5v0-1000k-a-snvsak0.gif
VOUT = 5 V fSW = 1000 kHz Auto Mode
Figure 27. LM76003 Efficiency
LM76002 LM76003 D018-LM76003-eff-5v0-2200k-a-snvsak0.gif
VOUT = 5 V fSW = 2200 kHz Auto Mode
Figure 29. LM76003 Efficiency
LM76002 LM76003 D020-LM76003-eff-12v0-500k-a-snvsak0.gif
VOUT = 12 V fSW = 500 kHz Auto Mode
Figure 31. LM76003 Efficiency
LM76002 LM76003 D022-LM76003-eff-24v0-300k-a-snvsak0.gif
VOUT = 24 V fSW = 300 kHz Auto Mode
Figure 33. LM76003 Efficiency
LM76002 LM76003 D024-LM76002-eff-5v0-500k-a-snvsak0.gif
VOUT = 5 V fSW = 500 kHz Auto Mode
Figure 35. LM76002 Efficiency
LM76002 LM76003 D012-LM76003-load-line-reg-3v3-500k-a-snvsak0.gif
VOUT = 3.3 V fSW = 500 kHz Auto Mode
Figure 37. LM76003 Load and Line Regulation
LM76002 LM76003 D015-LM76003-load-line-reg-5v0-500k-a-snvsak0.gif
VOUT = 5 V fSW = 500 kHz Auto Mode
Figure 39. LM76003 Load and Line Regulation
LM76002 LM76003 D017-LM76003-load-line-reg-5v0-1000k-a-snvsak0.gif
VOUT = 5 V fSW = 1000 kHz Auto Mode
Figure 41. LM76003 Load and Line Regulation
LM76002 LM76003 D019-LM76003-load-line-reg-5v0-2200k-a-snvsak0.gif
VOUT = 5 V fSW = 2200 kHz Auto Mode
Figure 43. LM76003 Load and Line Regulation
LM76002 LM76003 D021-LM76003-load-line-reg-12v0-500k-a-snvsak0.gif
VOUT = 12 V fSW = 500 kHz Auto Mode
Figure 45. LM76003 Load and Line Regulation
LM76002 LM76003 D023-LM76003-load-line-reg-24v0-300k-a-snvsak0.gif
VOUT = 24 V fSW = 300 kHz Auto Mode
Figure 47. LM76003 Load and Line Regulation
LM76002 LM76003 D025-LM76002-load-line-reg-5v0-500k-a-snvsak0.gif
VOUT = 5 V fSW = 500 kHz Auto Mode
Figure 49. LM76002 Load and Line Regulation
LM76002 LM76003 D026-LM76003-dropout-3v3-500k-snvsak0.gif
VOUT = 3.3 V fSW = 500 kHz Auto Mode
Figure 51. LM76003 Dropout Curve
LM76002 LM76003 D028-LM76003-dropout-5v0-1000k-snvsak0.gif
VOUT = 5 V fSW = 1000 kHz Auto Mode
Figure 53. LM76003 Dropout Curve
LM76002 LM76003 D030-LM76002-dropout-5v0-500k-snvsak0.gif
VOUT = 5 V fSW = 500 kHz Auto Mode
Figure 55. LM76002 Dropout Curve
LM76002 LM76003 D032-LM76003-dropout-24v0-300k-snvsak0.gif
VOUT = 24 V fSW = 300 kHz Auto Mode
Figure 57. LM76003 Dropout Curve
LM76002 LM76003 Switching_waveform_5v-500k_no_load_FPWM_mode.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
No Load FPWM Mode
Figure 59. LM76003 Switching Waveform and Output Ripple
LM76002 LM76003 Switching_waveform_5v_500k_100mA_load_FPWM_mode.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
100-mA Load FPWM Mode
Figure 61. LM76003 Switching Waveform and Output Ripple
LM76002 LM76003 Startup_vin12v_3V3_500k_no_load_fpwm.gif
VIN = 12 V VOUT = 3.3 V fSW = 500 kHz
No Load FPWM Mode
Figure 63. LM76003 Start-up Waveform
LM76002 LM76003 Startup_vin12v_5V_500k_no_load_fpwm.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
No Load FPWM Mode
Figure 65. LM76003 Start-up Waveform
LM76002 LM76003 Startup_vin12v_5V_500k_3a5_load_auto.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
3.5-A Load
Figure 67. Start-up Waveform
LM76002 LM76003 Startup_LM76002_5V_500k_2A5_load_fpwm.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
2.5-A Load
Figure 69. LM76002 Start-up Waveform
LM76002 LM76003 Startup-Prebiased_LM76002_5V-500k_no-load_fpwm.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
No Load FPWM Mode
Figure 71. LM76002 Start-up With Pre-Biased Output
LM76002 LM76003 LoadTransient_3V3-500k_10ma-to-3A5-to-10mA_Auto.gif
VIN = 12 V VOUT = 3.3 V fSW = 500 kHz
10 mA to 3.5 A to 10 mA Auto Mode
Figure 73. LM76003 Load Transient
LM76002 LM76003 LoadTransient_5V-500k_10ma-to-3A5-to-10mA_Auto.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
10 mA to 3.5 A to 10 mA Auto Mode
Figure 75. LM76003 Load Transient
LM76002 LM76003 LoadTransient_5V-1M0_10ma-to-3A5-to-10mA_Auto.gif
VIN = 12 V VOUT = 5 V fSW = 1000 kHz
10 mA to 3.5 A to 10 mA Auto Mode
Figure 77. LM76003 Load Transient
LM76002 LM76003 LoadTransient_5V-2M2_10ma-to-3A5-to-10mA_Auto.gif
VIN = 12 V VOUT = 5 V fSW = 2200 kHz
10 mA to 3.5 A to 10 mA Auto Mode
Figure 79. LM76003 Load Transient
LM76002 LM76003 LoadTransient_12V-500k_10ma-to-3A5-to-10mA_Auto.gif
VIN = 24 V VOUT = 12 V fSW = 500 kHz
10 mA to 3.5 A to 10 mA Auto Mode
Figure 81. LM76003 Load Transient
LM76002 LM76003 Load-Transient_LM76002_5V-500k_10mA-to-2A5-to-10ma_auto.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
10 mA to 2.5 A to 10 mA Auto Mode
Figure 83. LM76002 Load Transient
LM76002 LM76003 D011-LM76003-eff-3v3-500k-f-snvsak0.gif
VOUT = 3.3 V fSW = 500 kHz FPWM Mode
Figure 24. LM76003 Efficiency
LM76002 LM76003 D014-LM76003-eff-5v0-500k-f-snvsak0.gif
VOUT = 5 V fSW = 500 kHz FPWM Mode
Figure 26. LM76003 Efficiency
LM76002 LM76003 D016-LM76003-eff-5v0-1000k-f-snvsak0.gif
VOUT = 5 V fSW = 1000 kHz FPWM Mode
Figure 28. LM76003 Efficiency
LM76002 LM76003 D018-LM76003-eff-5v0-2200k-f-snvsak0.gif
VOUT = 5 V fSW = 2200 kHz FPWM Mode
Figure 30. LM76003 Efficiency
LM76002 LM76003 D020-LM76003-eff-12v0-500k-f-snvsak0.gif
VOUT = 12 V fSW = 500 kHz FPWM Mode
Figure 32. LM76003 Efficiency
LM76002 LM76003 D022-LM76003-eff-24v0-300k-f-snvsak0.gif
VOUT = 24 V fSW = 300 kHz FPWM Mode
Figure 34. LM76003 Efficiency
LM76002 LM76003 D024-LM76002-eff-5v0-500k-b-snvsak0.gif
VOUT = 5 V fSW = 500 kHz FPWM Mode
Figure 36. LM76002 Efficiency
LM76002 LM76003 D012-LM76003-load-line-reg-3v3-500k-f-snvsak0.gif
VOUT = 3.3 V fSW = 500 kHz FPWM Mode
Figure 38. LM76003 Load and Line Regulation
LM76002 LM76003 D015-LM76003-load-line-reg-5v0-500k-f-snvsak0.gif
VOUT = 5 V fSW = 500 kHz FPWM Mode
Figure 40. LM76003 Load and Line Regulation
LM76002 LM76003 D017-LM76003-load-line-reg-5v0-1000k-F-snvsak0.gif
VOUT = 5 V fSW = 1000 kHz FPWM Mode
Figure 42. LM76003 Load and Line Regulation
LM76002 LM76003 D019-LM76003-load-line-reg-5v0-2200k-f-snvsak0.gif
VOUT = 5 V fSW = 2200 kHz FPWM Mode
Figure 44. LM76003 Load and Line Regulation
LM76002 LM76003 D021-LM76003-load-line-reg-12v0-500k-f-snvsak0.gif
VOUT = 12 V fSW = 500 kHz FPWM Mode
Figure 46. LM76003 Load and Line Regulation
LM76002 LM76003 D023-LM76003-load-line-reg-24v0-300k-f-snvsak0.gif
VOUT = 24 V fSW = 300 kHz FPWM Mode
Figure 48. LM76003 Load and Line Regulation
LM76002 LM76003 D025-LM76002-load-line-reg-5v0-500k-f-snvsak0.gif
VOUT = 5 V fSW = 500 kHz FPWM Mode
Figure 50. LM76002 Load and Line Regulation
LM76002 LM76003 D027-LM76003-dropout-5v0-500k-snvsak0.gif
VOUT = 5 V fSW = 500 kHz Auto Mode
Figure 52. LM76003 Dropout Curve
LM76002 LM76003 D029-LM76003-dropout-5v0-2200k-snvsak0.gif
VOUT = 5 V fSW = 2200 kHz Auto Mode
Figure 54. LM76003 Dropout Curve
LM76002 LM76003 D031-LM76003-dropout-12v0-500k-snvsak0.gif
VOUT = 12 V fSW = 500 kHz Auto Mode
Figure 56. LM76003 Dropout Curve
LM76002 LM76003 Switching_waveform_5v_500k_no_load_Auto_mode.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
No Load Auto Mode
Figure 58. LM76003 Switching Waveform and Output Ripple
LM76002 LM76003 Switching-waveform_5v_500k_100mA_load_Auto_mode.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
100-mA Load Auto Mode
Figure 60. LM76003 Switching Waveform and Output Ripple
LM76002 LM76003 Startup_vin12v_3V3_500k_no-load_auto.gif
VIN = 12 V VOUT = 3.3 V fSW = 500 kHz
No Load Auto Mode
Figure 62. LM76003 Start-up Waveform
LM76002 LM76003 Startup_vin12v_5V_500k_no_load_auto.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
No Load Auto Mode
Figure 64. LM76003 Start-up Waveform
LM76002 LM76003 Startup_vin12v_3V3_500k_3a5-load_fpwm.gif
VIN = 12 V VOUT = 3.3 V fSW = 500 kHz
3.5-A Load
Figure 66. LM76003 Start-up Waveform
LM76002 LM76003 Startup_LM76002_5V_500k_no-load_auto.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
No Load Auto Mode
Figure 68. LM76002 Start-up Waveform
LM76002 LM76003 Startup-Prebiased_vin12v-5V-500k_no-load_fpwm.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
No Load Auto Mode
Figure 70. LM76003 Start-up With Pre-Biased Output
LM76002 LM76003 Short-Circuit-Hiccup-behavior.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
Auto Mode
Figure 72. LM76003 Short-Circuit Behavior With Hiccup
LM76002 LM76003 LoadTransient_3V3-500k_10ma-to-3A5-to-10mA_FPWM.gif
VIN = 12 V VOUT = 3.3 V fSW = 500 kHz
10 mA to 3.5 A to 10 mA FPWM Mode
Figure 74. LM76003 Load Transient
LM76002 LM76003 LoadTransient_5V-500k_10ma-to-3A5-to-10mA_FPWM.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
10 mA to 3.5 A to 10 mA FPWM Mode
Figure 76. LM76003 Load Transient
LM76002 LM76003 LoadTransient_5V-1M0_10ma-to-3A5-to-10mA_FPWM.gif
VIN = 12 V VOUT = 5 V fSW = 1000 kHz
10 mA to 3.5 A to 10 mA FPWM Mode
Figure 78. LM76003 Load Transient
LM76002 LM76003 LoadTransient_5V-2M2_10ma-to-3A5-to-10mA_FPWM.gif
VIN = 12 V VOUT = 5 V fSW = 2200 kHz
10 mA to 3.5 A to 10 mA FPWM Mode
Figure 80. LM76003 Load Transient
LM76002 LM76003 LoadTransient_12V-500k_10ma-to-3A5-to-10mA_FPWM.gif
VIN = 24 V VOUT = 12 V fSW = 500 kHz
10 mA to 3.5 A to 10 mA FPWM Mode
Figure 82. LM76003 Load Transient
LM76002 LM76003 Load-Transient_LM76002_5V-500k_10mA-to-2A5-to-10ma_fpwm.gif
VIN = 12 V VOUT = 5 V fSW = 500 kHz
10 mA to 2.5 A to 10 mA FPWM Mode
Figure 84. LM76002 Load Transient
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