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  • LMR38020 具有 40µA IQ 的 4.2V 至 80V、2A 同步 SIMPLE SWITCHER 电源转换器

    • ZHCSOE3E August   2021  – September 2023 LMR38020

      PRODUCTION DATA  

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  • LMR38020 具有 40µA IQ 的 4.2V 至 80V、2A 同步 SIMPLE SWITCHER 电源转换器
  1.   1
  2. 1 特性
  3. 2 应用
  4. 3 说明
  5. 4 Revision History
  6. 5 Device Comparison Table
  7. 6 Pin Configuration and Functions
  8. 7 Specifications
    1. 7.1 Absolute Maximum Ratings
    2. 7.2 ESD Ratings
    3. 7.3 Recommended Operating Conditions
    4. 7.4 Thermal Information
    5. 7.5 Electrical Characteristics
    6. 7.6 System Characteristics
    7. 7.7 Typical Characteristics
  9. 8 Detailed Description
    1. 8.1 Overview
    2. 8.2 Functional Block Diagram
    3. 8.3 Feature Description
      1. 8.3.1  Fixed Frequency Peak Current Mode Control
      2. 8.3.2  Adjustable Output Voltage
      3. 8.3.3  Enable
      4. 8.3.4  Switching Frequency and Synchronization (RT/SYNC)
      5. 8.3.5  Power-Good Flag Output
      6. 8.3.6  Minimum On Time, Minimum Off Time, and Frequency Foldback
      7. 8.3.7  Bootstrap Voltage
      8. 8.3.8  Overcurrent and Short Circuit Protection
      9. 8.3.9  Soft Start
      10. 8.3.10 Thermal Shutdown
    4. 8.4 Device Functional Modes
      1. 8.4.1 Auto Mode
      2. 8.4.2 Forced PWM Operation
      3. 8.4.3 Dropout
      4. 8.4.4 Minimum Switch On Time
  10. 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 Custom Design With WEBENCH® Tools
        2. 9.2.2.2 Choosing the Switching Frequency
        3. 9.2.2.3 FB for Adjustable Output
        4. 9.2.2.4 Inductor Selection
        5. 9.2.2.5 Output Capacitor Selection
        6. 9.2.2.6 Input Capacitor Selection
        7. 9.2.2.7 CBOOT
        8. 9.2.2.8 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
  11. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
        1. 10.1.1.1 Custom Design With WEBENCH® Tools
      2. 10.1.2 第三方产品免责声明
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 接收文档更新通知
    4. 10.4 支持资源
    5. 10.5 Trademarks
    6. 10.6 静电放电警告
    7. 10.7 术语表
  12. 11Mechanical, Packaging, and Orderable Information
  13. 重要声明
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Data Sheet

LMR38020 具有 40µA IQ 的 4.2V 至 80V、2A 同步 SIMPLE SWITCHER 电源转换器

本资源的原文使用英文撰写。 为方便起见，TI 提供了译文；由于翻译过程中可能使用了自动化工具，TI 不保证译文的准确性。 为确认准确性，请务必访问 ti.com 参考最新的英文版本（控制文档）。

1 特性

  • 功能安全型
    • 可提供用于功能安全系统设计的文档
  • 专用于条件严苛的工业应用
    • 4.2V 至 80V 输入电压范围
    • 2A 持续输出电流
    • 40µA 超低静态工作电流
    • VIN 和 GND 引脚之间的距离大于 1.5mm
    • 可调节开关频率范围为 200kHz 至 2.2MHz
    • 与外部时钟频率同步
    • 展频选项可降低 EMI
    • 97% 最大占空比
    • 支持带预偏置输出的启动
    • 室温下 ±1.0% 容差电压基准
    • 精密使能端
    • 器件易于使用，具有集成补偿网络，可实现较少的 BOM 数量
    • 集成同步整流
    • 采用 PowerPAD™ 集成电路封装的 8 引脚 HSOIC
    • PFM 和强制 PWM (FPWM) 选项
    • 提供 1A，LMR38010
  • 使用 LMR38020 并借助 WEBENCH® Power Designer 创建定制设计

2 应用

  • 工业运输
  • 无线基础设施和网络
  • 电力输送
  • 工厂自动化和控制

3 说明

LMR38020 同步降压转换器用于在宽输入电压范围内进行调节，从而尽可能减少对外部浪涌抑制元件的需求。LMR38020 能够在输入电压突降至 4.2V 时根据需要以接近 100% 的占空比继续工作，因而是 宽输入电压范围工业应用和 MHEV/EV 系统的理想选择。

LMR38020 使用精密使能端，通过支持直接连接到宽输入电压或对器件启动和关断进行精确控制来提供灵活性。附带内置滤波和延迟功能的电源正常状态标志可提供系统状态的真实指示，免去了使用外部监控器的麻烦。该器件采用假随机展频，具有超低 EMI，并且开关频率可以在 200kHz 和 2.2MHz 之间配置，从而避开噪声敏感频带。另外，可以选择频率，从而在低工作频率下提高效率，或在高工作频率下缩小解决方案尺寸。

该器件具有内置的保护功能，例如逐周期电流限制、断续模式短路保护以及功耗过大情况下的热关断功能。LMR38020采用 8 引脚 HSOIC PowerPAD 集成电路封装。

封装信息
器件型号 封装(1) 封装尺寸(2)
LMR38020 DDA（HSOIC，8） 4.89mm × 3.90mm
(1) 如需了解所有可用封装，请参阅数据表末尾的可订购产品附录。
(2) 封装尺寸（长 x 宽）为标称值，并包括引脚（如适用）。
GUID-20211115-SS0I-5GDB-K8C3-XHQ1F3QLZ2HW-low.svg简化原理图
GUID-20211108-SS0I-HSKK-08GH-NFH1K44MMLXK-low.svg效率与输出电流间的关系 VOUT = 5V，400kHz

4 Revision History

Changes from Revision D (August 2023) to Revision E (September 2023)

  • 更新了特性 列表中的 WEBENCH 链接Go

Changes from Revision C (January 2022) to Revision D (August 2023)

  • 更新了商标信息Go
  • 通篇去除了图像的随机颜色Go
  • 更新了数据表标题Go
  • 更新了特性 列表Go
  • Updated SW to PGND less than 10-ns transientsGo
  • Removed LMR38010 (1 A) Current Limit Information from TableGo
  • Updated High-Side and Low-Side Current Limit vs Temperature figureGo

Changes from Revision B (November 2021) to Revision C (January 2022)

  • 添加了 WEBENCH 部分内容Go
  • Removed "In Preview" noteGo

Changes from Revision A (October 2021) to Revision B (November 2021)

  • 将文档状态从“预告信息”更改为“量产数据”Go

5 Device Comparison Table

ORDERABLE PART NUMBER CURRENT FPWM SPREAD SPECTRUM
LMR38020SDDAR 2 A No Yes
LMR38020FDDAR 2 A Yes No
LMR38020FSDDAR 2 A Yes Yes

6 Pin Configuration and Functions

GUID-993C9F50-F002-4FC9-A3E0-57DB2C6D056E-low.gifFigure 6-1 DDA Package, 8-Pin HSOIC(Top View)
Table 6-1 Pin Functions
PINTYPEDESCRIPTION
NAMENO.
GND1GPower and analog ground terminal. All electrical parameters are measured with respect to this pin. Connect a high-quality bypass capacitor directly to this pin and VIN with short and wide traces.
EN2AEnable input to regulator. High = ON, low = OFF. Can be connected directly to VIN. Do not float.
VIN3PInput supply to the regulator. Connect a high-quality bypass capacitor or capacitors directly to this pin and GND with short and wide traces.
RT/SYNC4AResistor timing or external clock input. An internal amplifier holds this pin at a fixed voltage when using an external resistor to ground to set the switching frequency. If the pin is pulled above the PLL upper threshold, a mode change occurs and the pin becomes a synchronization input. The internal amplifier is disabled and the pin is a high impedance clock input to the internal PLL. If clocking edges stop, the internal amplifier is re-enabled and the operating mode returns to frequency programming by resistor.
FB5AFeedback input to the regulator. Connect to tap point of the feedback voltage divider. Do not float. Do not ground.
PG6AOpen-drain power-good flag output. Connect to a suitable voltage supply through a current limiting resistor. High = power OK, low = power bad. The flag pulls low when EN = low. Can be left open when not used.
BOOT7PBootstrap supply voltage for the internal high-side driver. Connect a high-quality 100-nF capacitor from this pin to the SW pin.
SW8PRegulator switch node. Connect to a power inductor.
EPTHERMAL PADThermalConnect to system ground.

7 Specifications

7.1 Absolute Maximum Ratings

Over junction temperature range of -40°C to 150°C (unless otherwise noted)(1)
MIN MAX UNIT
Input voltage VIN to PGND –0.3 85 V
EN to PGND –0.3 VIN+0.3 V
FB to PGND –0.3 5.5 V
RT/SYNC to PGND –0.3 5.5 V
Output voltage BOOT to SW –0.3 5.5 V
SW to PGND  –0.3 85 V
SW to PGND less than 10-ns transients  –5.0  85.3 V
PGOOD to PGND –0.3 20 V
Junction Temperature TJ –40 150 °C
Storage temperature, Tstg –65 150 °C
(1) Operation outside the Absolute Maximum Ratings may cause permanent device damage. Absolute Maximum Ratings do not imply functional operation of the device at these or any other conditions beyond those listed under Recommended Operating Conditions. If used outside the Recommended Operating Conditions but within the Absolute Maximum Ratings, the device may not be fully functional, and this may affect device reliability, functionality, performance, and shorten the device lifetime.

 
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