SNVS665H June   2010  – October 2015 LMZ14202EXT

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
  4. 4 Revision History
  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 Switching Characteristics
    7. 6.7 Typical Characteristics
  7. 7 Detailed Description
    1. 7.1 Overview
      1. 7.1.1 COT Control Circuit Overview
    2. 7.2 Functional Block Diagram
    3. 7.3 Feature Description
      1. 7.3.1 Output Overvoltage Comparator
      2. 7.3.2 Current Limit
      3. 7.3.3 Thermal Protection
      4. 7.3.4 Zero Coil Current Detection
      5. 7.3.5 Prebiased Start-Up
    4. 7.4 Device Functional Modes
      1. 7.4.1 Discontinuous Conduction and Continuous Conduction Modes Selection
  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 LMZ14202EXT 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 CIN Selection
          6. 8.2.2.1.6 RON Resistor Selection
            1. 8.2.2.1.6.1 Discontinuous Conduction and Continuous Conduction Modes Selection
      3. 8.2.3 Application Curves
  9. 9 Power Supply Recommendations
  10. 10Layout
    1. 10.1 Layout Guidelines
    2. 10.2 Layout Examples
    3. 10.3 Power Dissipation and Board Thermal Requirements
    4. 10.4 Power Module SMT Guidelines
  11. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Third-Party Products Disclaimer
      2. 11.1.2 Development Support
    2. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Community Resources
    4. 11.4 Trademarks
    5. 11.5 Electrostatic Discharge Caution
    6. 11.6 Glossary
  12. 12Mechanical, Packaging, and Orderable Information

Package Options

Mechanical Data (Package|Pins)
Thermal pad, mechanical data (Package|Pins)
Orderable Information

5 Pin Configuration and Functions

NDW Package
7-Pin TO-PMOD
Top View
LMZ14202EXT 30117702.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.
EP — 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.
FB 6 Analog Feedback — Internally 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 EP.
RON 2 Analog ON-Time Resistor — An external resistor from VIN to this 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, overcurrent, 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.