ZHCS546P December   2009  – April 2019 LMZ10504

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      典型应用电路
      2.      效率 (VOUT = 3.3V)
  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 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 Enable
      2. 7.3.2 Enable and UVLO
      3. 7.3.3 Soft-Start
      4. 7.3.4 Soft-Start Capacitor
      5. 7.3.5 Tracking
      6. 7.3.6 Tracking - Equal Soft-Start Time
      7. 7.3.7 Tracking - Equal Slew Rates
      8. 7.3.8 Current Limit
      9. 7.3.9 Overtemperature Protection
    4. 7.4 Device Functional Modes
      1. 7.4.1 Prebias Start-Up Capability
  8. 8 Application 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 Input Capacitor Selection
        3. 8.2.2.3 Output Capacitor Selection
          1. 8.2.2.3.1 Output Voltage Setting
        4. 8.2.2.4 Loop Compensation
      3. 8.2.3 Application Curves
    3. 8.3 System Examples
      1. 8.3.1 Application Schematic for 3.3-V to 5-V Input and 2.5-V Output With Optimized Ripple and Transient Response
      2. 8.3.2 Application Schematic for 3.3-V to 5-V Input and 2.5-V Output
      3. 8.3.3 EMI Tested Schematic for 2.5-V Output Based on 3.3-V to 5-V Input
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Estimate Power Dissipation and Thermal Considerations
    4. 10.4 Power Module SMT Guidelines
  11. 11器件和文档支持
    1. 11.1 器件支持
      1. 11.1.1 第三方产品免责声明
      2. 11.1.2 开发支持
        1. 11.1.2.1 使用 WEBENCH® 工具创建定制设计
    2. 11.2 文档支持
      1. 11.2.1 相关文档
    3. 11.3 接收文档更新通知
    4. 11.4 社区资源
    5. 11.5 商标
    6. 11.6 静电放电警告
    7. 11.7 术语表
  12. 12机械、封装和可订购信息

封装选项

机械数据 (封装 | 引脚)
散热焊盘机械数据 (封装 | 引脚)
订购信息

8.3.3 EMI Tested Schematic for 2.5-V Output Based on 3.3-V to 5-V Input

The compensation for each solution was optimized to work over the stated input range. Many applications have a fixed input voltage rail. It is possible to modify the compensation to obtain a faster transient response for a given input voltage operating point. This schematic is intended to serve as a helpful starting point towards an optimized design.

LMZ10504 30088208.gifFigure 28. EMI Tested Schematic for 2.5-V Output Based on 3.3-V to 5-V Input

Table 9. Bill of Materials, VIN = 5 V, VOUT = 2.5 V, IOUT (MAX) = 4 A,
Tested With EN55022 Class B Radiated Emissions

DESIGNATOR DESCRIPTION CASE SIZE MANUFACTURER MANUFACTURER P/N QUANTITY
U1 Power Module PFM-7 Texas Instruments LMZ10504TZ-ADJ 1
Cin1 1 µF, X7R, 16 V 0805 TDK C2012X7R1C105K 1
Cin2 4.7 µF, X5R, 6.3 V 0805 TDK C2012X5R0J475K 1
Cin3 47 µF, X5R, 6.3 V 1210 TDK C3225X5R0J476M 1
CO1 100 µF, X5R, 6.3 V 1812 TDK C4532X5R0J107M 1
Rfbt 75 kΩ 0805 Vishay Dale CRCW080575K0FKEA 1
Rfbb 34.8 kΩ 0805 Vishay Dale CRCW080534K8FKEA 1
Rcomp 1.1 kΩ 0805 Vishay Dale CRCW08051K10FKEA 1
Ccomp 180 pF, ±5%, C0G, 50 V 0603 TDK C1608C0G1H181J 1
CSS 10 nF, ±5%, C0G, 50 V 0805 TDK C2012C0G1H103J 1

Table 10. Output Voltage Setting (Rfbt = 75 kΩ)

VOUT Rfbb
3.3 V 23.7 kΩ
2.5 V 34.8 kΩ
1.8 V 59 kΩ
1.5 V 84.5 kΩ
1.2 V 150 kΩ
0.9 V 590 kΩ