ZHCSM29A September   2023  – June 2024 LM70840-Q1 , LM70860-Q1 , LM70880-Q1

PRODUCTION DATA  

  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 说明（续）
  6. 5 Pin Configuration and Functions
  7. 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 Typical Characteristics
  8. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Input Voltage Range (VIN)
      2. 7.3.2  High-Voltage Bias Supply Regulator (VCC, BIAS, VDDA)
      3. 7.3.3  Enable (EN)
      4. 7.3.4  Power-Good Monitor (PG)
      5. 7.3.5  Switching Frequency (RT)
      6. 7.3.6  Dual Random Spread Spectrum (DRSS)
      7. 7.3.7  Soft Start
      8. 7.3.8  Output Voltage Setpoint (FB)
      9. 7.3.9  Minimum Controllable On-Time
      10. 7.3.10 Error Amplifier and PWM Comparator (FB, EXTCOMP)
      11. 7.3.11 Slope Compensation
      12. 7.3.12 Shunt Current Sensing
      13. 7.3.13 Hiccup Mode Current Limiting
      14. 7.3.14 Device Configuration (CONFIG)
      15. 7.3.15 Single-Output Dual-phase Operation
      16. 7.3.16 Pulse Frequency Modulation (PFM) / Synchronization
      17. 7.3.17 Thermal Shutdown (TSD)
    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 Sleep Mode
  9. 8 Application and Implementation
    1. 8.1 Application Information
      1. 8.1.1 Power Train Components
        1. 8.1.1.1 Buck Inductor
        2. 8.1.1.2 Output Capacitors
        3. 8.1.1.3 Input Capacitors
        4. 8.1.1.4 EMI Filter
      2. 8.1.2 Error Amplifier and Compensation
      3. 8.1.3 Maximum Ambient Temperature
        1. 8.1.3.1 Derating Curves
    2. 8.2 Typical Applications
      1. 8.2.1 Design 1 – High Efficiency, Wide Input, 400-kHz Synchronous Buck Regulator
        1. 8.2.1.1 Design Requirements
        2. 8.2.1.2 Detailed Design Procedure
          1. 8.2.1.2.1 Custom Design With WEBENCH® Tools
          2. 8.2.1.2.2 Custom Design With Excel Quickstart Tool
          3. 8.2.1.2.3 Buck Inductor
          4. 8.2.1.2.4 Current-Sense Resistance
          5. 8.2.1.2.5 Output Capacitors
          6. 8.2.1.2.6 Input Capacitors
          7. 8.2.1.2.7 Frequency Set Resistor
          8. 8.2.1.2.8 Feedback Resistors
          9. 8.2.1.2.9 Compensation Components
        3. 8.2.1.3 Application Curves
      2. 8.2.2 Design 2 – High Efficiency 48V to 12V 400kHz Synchronous Buck Regulator
        1. 8.2.2.1 Design Requirements
        2. 8.2.2.2 Detailed Design Procedure
        3. 8.2.2.3 Application Curves
    3. 8.3 Power Supply Recommendations
    4. 8.4 Layout
      1. 8.4.1 Layout Guidelines
      2. 8.4.2 Thermal Design and Layout
      3. 8.4.3 Layout Example
  10. 9 Device and Documentation Support
    1. 9.1 Device Support
      1. 9.1.1 Development Support
        1. 9.1.1.1 Custom Design With WEBENCH® Tools
    2. 9.2 Documentation Support
      1. 9.2.1 Related Documentation
        1. 9.2.1.1 PCB Layout Resources
        2. 9.2.1.2 Thermal Design Resources
    3. 9.3 接收文档更新通知
    4. 9.4 支持资源
    5. 9.5 Trademarks
    6. 9.6 静电放电警告
    7. 9.7 术语表
  11. 10Revision History
  12. 11Mechanical, Packaging, and Orderable Information

请参考 PDF 数据表获取器件具体的封装图。

机械数据 (封装 | 引脚)
  • RRX|29
散热焊盘机械数据 (封装 | 引脚)

8.1.3.1 Derating Curves

The data in this section was taken on the LM70880QEVM evaluation board with a device and PCB combination, giving an RθJA of about 19°C/W. Note that the data given in these graphs are for illustration purposes only and the actual performance in any given application depends on all of the previously mentioned factors.

LM70840-Q1 LM70860-Q1 LM70880-Q1 Maximum Output Current versus Ambient Temperature
VIN = 48V VOUT = 3.3V
ƒSW = 400kHz RθJA = 18.6°C/W
Figure 8-4 Maximum Output Current versus Ambient Temperature
LM70840-Q1 LM70860-Q1 LM70880-Q1 Maximum Output Current versus Ambient Temperature
VIN = 12V VOUT = 5V
ƒSW = 2.1MHz RθJA = 18.6°C/W
Figure 8-6 Maximum Output Current versus Ambient Temperature
LM70840-Q1 LM70860-Q1 LM70880-Q1 Maximum Output Current versus Ambient Temperature
VIN = 48V VOUT = 5V
ƒSW = 400kHz RθJA = 18.6°C/W
Figure 8-5 Maximum Output Current versus Ambient Temperature
LM70840-Q1 LM70860-Q1 LM70880-Q1 Maximum Output Current versus Ambient Temperature
VIN = 48V VOUT = 12V
ƒSW = 400kHz RθJA = 18.6°C/W
Figure 8-7 Maximum Output Current versus Ambient Temperature
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