ZHCS553J January   2010  – October 2015 LMZ14202

PRODUCTION DATA.  

  1. 1 特性
  2. 2 应用
  3. 3 说明
  4. 4 修订历史记录
  5. 5 Pin Configuration and 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 Constant On-Time Control (COT) Circuit Overview
      2. 7.3.2 Output Overvoltage Comparator
      3. 7.3.3 Current Limit
      4. 7.3.4 Thermal Protection
      5. 7.3.5 Zero Coil Current Detection
      6. 7.3.6 Prebiased Start-Up
    4. 7.4 Device Functional Modes
      1. 7.4.1 Discontinuous Conduction and Continuous Conduction Modes
  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 Design Steps for the LMZ14202 Application
          1. 8.2.2.1.1 Enable Divider, RENT and RENB Selection
          2. 8.2.2.1.2 Output Voltage Selection
          3. 8.2.2.1.3 Soft-Start Capacitor Selection
          4. 8.2.2.1.4 CO Selection
          5. 8.2.2.1.5 Input Capacitance (CIN) Selection
          6. 8.2.2.1.6 RDS(on) Resistor Selection
            1. 8.2.2.1.6.1 Discontinuous Conduction and Continuous Conduction Mode Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Example
    3. 10.3 Power Dissipation and Board Thermal Requirements
    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 Third-Party Products Disclaimer
      2. 11.1.2 开发支持
    2. 11.2 文档支持
      1. 11.2.1 相关文档　
    3. 11.3 社区资源
    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

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

5 Pin Configuration and Functions

NDW Package
7-Pin TO-PMOD
Top View
LMZ14202 30114502.gif

Pin Functions

PIN TYPE DESCRIPTION
NAME NO.
EN 3 Analog Enable. Input to the precision enable comparator. Rising threshold is 1.18 V nominal, 90 mV hysteresis nominal. Maximum recommended input level is 6.5 V.
FB 6 Analog Feedback. nternally connected to the regulation, overvoltage, and short-circuit comparators. The regulation reference point is 0.8 V at this input pin. Connected the feedback resistor divider between the output and ground to set the output voltage.
GND 4 Ground Ground. Reference point for all stated voltages. Must be externally connected to thermal pad.
RON 2 Analog ON-time resistor. An external resistor between this pin and the VIN pin sets the ON-time of the application. Typical values range from 25 kΩ to 124 kΩ.
SS 5 Analog Soft-start. An internal 8-µA current source charges an external capacitor to produce the soft-start function. This node is discharged at 200 µA during disable, over-current, thermal shutdown and internal UVLO conditions.
VIN 1 Power Supply input. Nominal operating range is 6 V to 42 V . A small amount of internal capacitance is contained within the package assembly. Additional external input capacitance is required between this pin and exposed pad.
VOUT 7 Power Output voltage. Output from the internal inductor. Connect the output capacitor between this pin and exposed pad.
Thermal pad Ground Exposed Pad — Internally connected to pin 4. Used to dissipate heat from the package during operation. Must be electrically connected to pin 4 external to the package.
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