SLVSBM9E October   2013  – September 2018 LMZ31520

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
    1.     Efficiency
  3. 3 Description
    1.     Simplified Application
  4. 4 Specifications
    1. 4.1 Absolute Maximum Ratings
    2. 4.2 Recommended Operating Conditions
    3. 4.3 Thermal Information
    4. 4.4 Package Specifications
    5. 4.5 Electrical Characteristics
  5. 5 Device Information
    1.     Pin Functions
    2. 5.1 Functional Block Diagram
  6. 6 Typical Characteristics (PVIN = VIN = 12 V)
  7. 7 Typical Characteristics (PVIN = VIN = 5 V)
  8. 8 Application Information
    1. 8.1  Adjusting the Output Voltage
    2. 8.2  Frequency Select
    3. 8.3  Capacitor Recommendations for the LMZ31520 Power Supply
      1. 8.3.1 Capacitor Technologies
        1. 8.3.1.1 Electrolytic, Polymer-Electrolytic Capacitors
        2. 8.3.1.2 Ceramic Capacitors
        3. 8.3.1.3 Tantalum, Polymer-Tantalum Capacitors
        4. 8.3.1.4 Input Capacitor
        5. 8.3.1.5 Output Capacitor
    4. 8.4  Transient Response
    5. 8.5  Application Curves Device configured for FCCM mode of operation, (pin 3 connected to pin 19).
    6. 8.6  Application Schematics
    7. 8.7  Custom Design With WEBENCH® Tools
    8. 8.8  VIN and PVIN Input Voltage
    9. 8.9  3.3 V PVIN Operation
    10. 8.10 Power Good (PWRGD)
    11. 8.11 Slow Start (SS_SEL)
    12. 8.12 Auto-Skip Eco-mode / Forced Continuous Conduction Mode
    13. 8.13 Power-Up Characteristics
    14. 8.14 Pre-Biased Start-Up
    15. 8.15 Remote Sense
    16. 8.16 Output On/Off Inhibit (INH)
    17. 8.17 Overcurrent Protection
    18. 8.18 Current Limit (ILIM) Adjust
    19. 8.19 Thermal Shutdown
    20. 8.20 Layout Considerations
    21. 8.21 EMI
  9. 9 Revision History
  10. 10Device and Documentation Support
    1. 10.1 Device Support
      1. 10.1.1 Development Support
        1. 10.1.1.1 Custom Design With WEBENCH® Tools
    2. 10.2 Documentation Support
      1. 10.2.1 Related Documentation
    3. 10.3 Receiving Notification of Documentation Updates
    4. 10.4 Community Resources
    5. 10.5 Trademarks
    6. 10.6 Electrostatic Discharge Caution
    7. 10.7 Glossary
  11. 11Mechanical, Packaging, and Orderable Information
    1. 11.1 Tape and Reel Information

Package Options

Refer to the PDF data sheet for device specific package drawings

Mechanical Data (Package|Pins)
  • RLG|72
Thermal pad, mechanical data (Package|Pins)
Orderable Information

8.4 Transient Response

The LMZ31520 is designed to have an ultra-fast load step response with minimal output capacitance. Table 4 shows the voltage deviation and recovery time for several different transient conditions. Several transient waveforms are shown in Application Curves Device configured for FCCM mode of operation, (pin 3 connected to pin 19).

Table 4. Output Voltage Transient Response

CIN1 = 3 x 47 µF CERAMIC
VOUT(V) VIN(V) COUT1 Ceramic COUT2 BULK VOLTAGE DEVIATION (mV) RECOVERY TIME (µs)
5 A LOAD STEP, (1 A/µs) 10 A LOAD STEP, (1 A/µs)
0.6 5 500 µF - 8 15 35
12 500 µF - 8 15 35
0.9 5 500 µF - 8 15 40
500 µF 470 µF 6 12 40
12 500 µF - 8 20 40
500 µF 470 µF 7 16 40
1.2 5 500 µF - 10 20 40
500 µF 330 µF 8 15 40
12 500 µF - 10 20 40
500 µF 330 µF 8 16 40
1.8 5 500 µF - 10 20 40
500 µF 330 µF 8 16 40
12 500 µF - 10 20 40
500 µF 330 µF 8 16 45
3.3 5 500 µF - 12 25 50
12 500 µF - 12 25 50