SNVSAJ2C March   2016  – June 2018 LMZ34202

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Device Images
      1.      Simplified Application
      2.      Efficiency vs Output Current
  4. 4 Revision History
  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. 11Device and Documentation Support
    1. 11.1 Device Support
      1. 11.1.1 Development Support
        1. 11.1.1.1 Custom Design With WEBENCH® Tools
      2. 11.1.2 Third-Party Products Disclaimer
    2. 11.2 Receiving Notification of Documentation Updates
    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
    1. 12.1 Tape and Reel Information

Package Options

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

7.3.1 Adjusting the Output Voltage

The VADJ pin sets the output voltage of the LMZ34202. The output voltage adjustment range is from 2.5 V to 7.5 V. The switching frequency range for any output voltage must be determined from Table 4 or Table 5. The adjustment method requires the addition of RSET, which sets the output voltage, and the connection of SENSE+ to VOUT. The RSET resistor must be connected directly between the VADJ (pin 24) and AGND. The SENSE+ pin (pin 22) must be connected to VOUT either at the load for improved regulation or at VOUT of the device. Table 1 lists the standard external RSET resistor for a number of common bus voltages.

Table 1. Standard RSET Resistor Values for Common Output Voltages

OUTPUT VOLTAGE VOUT (V)
2.5 3.3 5.0 6.0 7.5
RSET (kΩ) 13.7 8.87 5.11 4.02 3.09

For other output voltages, the value of the required resistor can either be calculated using the following formula, or simply selected from the range of values given in Table 2.

Equation 1. LMZ34202 Rset_Equation.gif

Table 2. Standard RSET Resistor Values

VOUT (V) RSET (kΩ) VOUT (V) RSET (kΩ)
2.5 13.7 5.1 4.99
2.6 12.7 5.2 4.87
2.7 11.8 5.3 4.75
2.8 11.3 5.4 4.64
2.9 10.7 5.5 4.53
3.0 10.2 5.6 4.42
3.1 9.76 5.7 4.32
3.2 9.31 5.8 4.22
3.3 8.87 5.9 4.12
3.4 8.45 6.0 4.02
3.5 8.06 6.1 3.97
3.6 7.87 6.2 3.92
3.7 7.50 6.3 3.83
3.8 7.32 6.4 3.74
3.9 6.98 6.5 3.65
4.0 6.81 6.6 3.61
4.1 6.49 6.7 3.57
4.2 6.34 6.8 3.48
4.3 6.19 6.9 3.40
4.4 5.90 7.0 3.36
4.5 5.76 7.1 3.32
4.6 5.62 7.2 3.24
4.7 5.49 7.3 3.20
4.8 5.36 7.4 3.16
4.9 5.23 7.5 3.09
5.0 5.11