ZHCSEU9C March   2016  – June 2018 LMZ34202

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
    1.     Device Images
      1.      简化应用
      2.      效率与输出电流间的关系
  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 Switching Characteristics
    7. 6.7 Typical Characteristics
    8. 6.8 Typical Characteristics (Thermal Derating)
  7. 7 Detailed Description
    1. 7.1 Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1  Adjusting the Output Voltage
      2. 7.3.2  Switching Frequency (RT)
      3. 7.3.3  Recommended Operating Range
      4. 7.3.4  Synchronization (CLK)
      5. 7.3.5  Output Capacitor Selection
      6. 7.3.6  VERSA-COMP Pin Configurations
      7. 7.3.7  Input Capacitor Selection
      8. 7.3.8  Output On/Off Inhibit (INH/UVLO)
      9. 7.3.9  Under Voltage Lockout (UVLO)
      10. 7.3.10 Remote Sense
      11. 7.3.11 VBSEL
      12. 7.3.12 Soft-Start (SS/TR)
      13. 7.3.13 Power Good (PWRGD) and Pull-up (PWRGD_PU)
      14. 7.3.14 Overcurrent Protection
      15. 7.3.15 Thermal Shutdown
    4. 7.4 Device Functional Modes
      1. 7.4.1 Active Mode
      2. 7.4.2 Light Load Operation
      3. 7.4.3 Shutdown Mode
  8. 8 Application and Implementation
    1. 8.1 Application Information
    2. 8.2 Typical Application
      1. 8.2.1 Minimum External Component Application
        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 Output Voltage Set-Point
          3. 8.2.1.2.3 RT and RTSEL
          4. 8.2.1.2.4 VERSA-COMP
          5. 8.2.1.2.5 VBSEL
          6. 8.2.1.2.6 Input Capacitors
          7. 8.2.1.2.7 Output Capacitors
        3. 8.2.1.3 Application Curves
      2. 8.2.2 INH Control Application
        1. 8.2.2.1 Design Requirements
      3. 8.2.3 Detailed Design Procedure
        1. 8.2.3.1 Switching Frequency
        2. 8.2.3.2 Power Good
        3. 8.2.3.3 Inhibit Control
        4. 8.2.3.4 VERSA-COMP
        5. 8.2.3.5 VBSEL
        6. 8.2.3.6 Soft-Start Capacitors
        7. 8.2.3.7 Input Capacitors
        8. 8.2.3.8 Output Capacitors
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 EMI
  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. 11.1.2 第三方产品免责声明
    2. 11.2 接收文档更新通知
    3. 11.3 社区资源
    4. 11.4 商标
    5. 11.5 静电放电警告
    6. 11.6 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

7.3.5 Output Capacitor Selection

The minimum required and maximum output capacitance of the LMZ34202 is a function of the output voltage as shown in Table 6. Additionally, the output voltage will determine the Versa-Comp configuration (see VERSA-COMP Pin Configurations), which is also included in Table 6. The capacitance values listed in Table 6 are the specified capacitance values. The effects of DC bias and temperature variation must be considered when using ceramic capacitance. For ceramic capacitors, package size, voltage rating, and dielectric material will contribute to differences between the specified value and the actual effective value of the capacitance. COUT(min) must be comprised of ceramic type capacitors. Additional capacitance, not exceeding COUT(max), may be ceramic type or low-ESR polymer type. See Table 7 for a preferred list of output capacitors by vendor.

Table 6. Required Output Capacitance

VOUT (V) MINIMUM REQUIRED COUT (µF) (1)(2) MAXIMUM COUT (µF) (2) Versa-Comp Connection
2.5 64 350 Leave OPEN
3.3 64 350 Connect to VADJ
5.0 64 350 Connect to VADJ
6.0 64 200 Connect to VADJ
7.5 100 200 Connect to VADJ
(1) Minimum required output capacitance must be comprised of ceramic capacitance.
(2) COUT values represent specified capacitance values.

Table 7. Recommended Output Capacitors(1)

VENDOR SERIES PART NUMBER CAPACITOR CHARACTERISTICS
WORKING VOLTAGE (V) CAPACITANCE(1)
(µF)		 ESR(2)
(mΩ)
TDK X5R C3225X5R1C106K 16 10 2
Murata X5R GRM32ER61C106K 16 10 2
TDK X5R C3225X5R1C226M 16 22 2
Murata X5R GRM32ER61C226K 16 22 2
TDK X5R C3225X5R1A476M 10 47 2
Murata X5R GRM32ER61C476K 16 47 3
TDK X5R C3225X5R0J107M 6.3 100 2
Murata X5R GRM32ER60J107M 6.3 100 2
Murata X5R GRM32ER61A107M 10 100 2
Kemet X5R C1210C107M4PAC7800 16 100 2
Panasonic POSCAP 6TPE100MI 6.3 100 18
Panasonic POSCAP 6TPF220M9L 6.3 220 9
Panasonic POSCAP 6TPE220ML 6.3 220 12
(1) Specified capacitance values.