SLPS327B September   2012  – April 2018 CSD86360Q5D

PRODUCTION DATA.  

  1. 1Features
  2. 2Applications
  3. 3Description
    1. 3.1 Top View
      1.      Device Images
  4. 4Revision History
  5. 5Specifications
    1. 5.1 Absolute Maximum Ratings
    2. 5.2 Recommended Operating Conditions
    3. 5.3 Power Block Performance
    4. 5.4 Thermal Information
    5. 5.5 Electrical Characteristics
    6. 5.6 Typical Power Block Device Characteristics
    7. 5.7 Typical Power Block MOSFET Characteristics
  6. 6Application and Implementation
    1. 6.1 Application Information
      1. 6.1.1 Equivalent System Performance
      2. 6.1.2 Power Loss Curves
      3. 6.1.3 Safe Operating Area (SOA) Curves
      4. 6.1.4 Normalized Curves
    2. 6.2 Typical Application
      1. 6.2.1 Design Example: Calculating Power Loss and SOA
        1. 6.2.1.1 Operating Conditions
        2. 6.2.1.2 Calculating Power Loss
        3. 6.2.1.3 Calculating SOA Adjustments
  7. 7Layout
    1. 7.1 Layout Guidelines
      1. 7.1.1 Electrical Performance
      2. 7.1.2 Thermal Performance
    2. 7.2 Layout Example
  8. 8Device and Documentation Support
    1. 8.1 Documentation Support
      1. 8.1.1 Related Documentation
    2. 8.2 Receiving Notification of Documentation Updates
    3. 8.3 Community Resources
    4. 8.4 Trademarks
    5. 8.5 Electrostatic Discharge Caution
    6. 8.6 Glossary
  9. 9Mechanical, Packaging, and Orderable Information
    1. 9.1 Q5D Package Dimensions
    2. 9.2 Land Pattern Recommendation
    3. 9.3 Stencil Recommendation
    4. 9.4 Q5D Tape and Reel Information

Package Options

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

6.2.1.3 Calculating SOA Adjustments

  • SOA adjustment for input voltage ≈ 1.3°C (Figure 7)
  • SOA adjustment for output voltage ≈ –2.5°C (Figure 8)
  • SOA adjustment for switching frequency ≈ 6.0°C (Figure 6)
  • SOA adjustment for output inductor ≈ 1.3°C (Figure 9)
  • Final calculated SOA adjustment = 1.3 + (–2.5) + 6.0 + 1.3 ≈ 6.1°C

In the design example above, the estimated power loss of the CSD86360Q5D would increase to 3.84 W. In addition, the maximum allowable board and/or ambient temperature would have to decrease by 6.1°C. Figure 33 graphically shows how the SOA curve would be adjusted accordingly.

  1. Start by drawing a horizontal line from the application current to the SOA curve.
  2. Draw a vertical line from the SOA curve intercept down to the board/ambient temperature.
  3. Adjust the SOA board/ambient temperature by subtracting the temperature adjustment value.

In the design example, the SOA temperature adjustment yields a reduction in allowable board/ambient temperature of 6.1°C. In the event the adjustment value is a negative number, subtracting the negative number would yield an increase in allowable board/ambient temperature.

CSD86360Q5D soa_example.pngFigure 33. Power Block SOA