SLVSBV8E June   2013  – February 2020 LMZ31704

PRODUCTION DATA.  

  1. 1 Features
  2. 2 Applications
  3. 3 Description
    1.     Simplified Application
  4. 4 Revision History
  5. 5 Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 ESD Ratings
    3. 5.3 Recommended Operating Conditions
    4. 5.4 Package Specifications
    5. 5.5 Thermal Information
    6. 5.6 Electrical Characteristics
  6. 6 Device Information
    1. 6.1 Functional Block Diagram
    2.     Pin Functions
  7. 7 Typical Characteristics (PVIN = VIN = 12 V)
  8. 8 Typical Characteristics (PVIN = VIN = 5 V)
  9. 9 Typical Characteristics (PVIN = 3.3 V, VIN = 5 V)
  10. 10Application Information
    1. 10.1  Adjusting the Output Voltage
    2. 10.2  Capacitor Recommendations for the LMZ31704 Power Supply
      1. 10.2.1 Capacitor Technologies
        1. 10.2.1.1 Electrolytic, Polymer-Electrolytic Capacitors
        2. 10.2.1.2 Ceramic Capacitors
        3. 10.2.1.3 Tantalum, Polymer-Tantalum Capacitors
      2. 10.2.2 Input Capacitor
      3. 10.2.3 Output Capacitor
    3. 10.3  Transient Response
    4. 10.4  Transient Waveforms
    5. 10.5  Application Schematics
    6. 10.6  Custom Design With WEBENCH® Tools
    7. 10.7  VIN and PVIN Input Voltage
    8. 10.8  3.3 V PVIN Operation
    9. 10.9  Power Good (PWRGD)
    10. 10.10 SYNC_OUT
    11. 10.11 Parallel Operation
    12. 10.12 Light Load Efficiency (LLE)
    13. 10.13 Power-Up Characteristics
    14. 10.14 Pre-Biased Start-up
    15. 10.15 Remote Sense
    16. 10.16 Thermal Shutdown
    17. 10.17 Output On/Off Inhibit (INH)
    18. 10.18 Slow Start (SS/TR)
    19. 10.19 Overcurrent Protection
    20. 10.20 Synchronization (CLK)
    21. 10.21 Sequencing (SS/TR)
    22. 10.22 Programmable Undervoltage Lockout (UVLO)
    23. 10.23 Layout Considerations
    24. 10.24 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. 11.2 Documentation Support
      1. 11.2.1 Related Documentation
    3. 11.3 Receiving Notification of Documentation Updates
    4. 11.4 Support Resources
    5. 11.5 Trademarks
    6. 11.6 Electrostatic Discharge Caution
    7. 11.7 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

10.2.3 Output Capacitor

The required output capacitance is determined by the output voltage of the LMZ31704. See Table 3 for the amount of required capacitance. The effects of temperature and capacitor voltage rating must be considered when selecting capacitors to meet the minimum required capacitance. The required output capacitance can be comprised of all ceramic capacitors, or a combination of ceramic and bulk capacitors. The required capacitance must include at least one 47 µF ceramic. When adding additional non-ceramic bulk capacitors, low-ESR devices like the ones recommended in Table 4 are required. The required capacitance above the minimum is determined by actual transient deviation requirements. Table 4 includes a preferred list of capacitors by vendor.

Table 3. Required Output Capacitance

VOUT RANGE (V) MINIMUM REQUIRED COUT (µF)
MIN MAX
0.6 < 0.8 500 µF (1)
0.8 < 1.2 300 µF (1)
1.2 < 3.0 200 µF (1)
3.0 < 4.0 100 µF (1)
4.0 5.5 47-µF ceramic
(1) Minimum required must include at least one 47-µF ceramic capacitor.

Table 4. Recommended Input/Output Capacitors(1)

VENDOR SERIES PART NUMBER CAPACITOR CHARACTERISTICS
WORKING VOLTAGE
(V)		 CAPACITANCE
(µF)		 ESR (2)
(mΩ)
Murata X5R GRM32ER61E226K 25 22 2
TDK X5R C3225X5R0J107M 6.3 100 2
TDK X5R C3225X5R0J476K 6.3 47 2
Murata X5R GRM32ER60J107M 6.3 100 2
Murata X5R GRM32ER60J476M 6.3 47 2
Panasonic EEH-ZA EEH-ZA1E101XP 25 100 30
Sanyo POSCAP 16TQC68M 16 68 50
Kemet T520 T520V107M010ASE025 10 100 25
Sanyo POSCAP 10TPE220ML 10 220 25
Sanyo POSCAP 6TPE100MI 6.3 100 25
Sanyo POSCAP 2R5TPE220M7 2.5 220 7
Kemet T530 T530D227M006ATE006 6.3 220 6
Kemet T530 T530D337M006ATE010 6.3 330 10
Sanyo POSCAP 2TPF330M6 2.0 330 6
Sanyo POSCAP 6TPE330MFL 6.3 330 15
(1) Capacitor Supplier Verification, RoHS, Lead-free and Material Details
Consult capacitor suppliers regarding availability, material composition, RoHS and lead-free status, and manufacturing process requirements for any capacitors identified in this table.
(2) Maximum ESR at 100 kHz, 25°C.