Datasheet

   
     
  
SLOS289E − DECEMBER 1999 − REVISED SEPTEMBER 2006
14
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
APPLICATION INFORMATION
general PowerPAD design considerations
The TLV411x is available in a thermally-enhanced PowerPAD family of packages. These packages are
constructed using a downset leadframe upon which the die is mounted [see Figure 30(a) and Figure 30(b)]. This
arrangement results in the lead frame being exposed as a thermal pad on the underside of the package [see
Figure 30(c)]. Because this thermal pad has direct thermal contact with the die, excellent thermal performance
can be achieved by providing a good thermal path away from the thermal pad.
The PowerPAD package allows for both assembly and thermal management in one manufacturing operation.
During the surface-mount solder operation (when the leads are being soldered), the thermal pad must be
soldered to a copper area underneath the package. Through the use of thermal paths within this copper area,
heat can be conducted away from the package into either a ground plane or other heat dissipating device.
Soldering the PowerPAD to the PCB is always recommended, even with applications that have low-power
dissipation. This provides the necessary thermal and mechanical connection between the lead frame die pad
and the PCB.
The PowerPAD package represents a breakthrough in combining the small area and ease of assembly of
surface mount with mechanical methods of heatsinking.
DIE
Side View (a)
End View (b) Bottom View (c)
DIE
Thermal
Pad
NOTE A: The thermal pad is electrically isolated from all terminals in the package.
Figure 30. Views of Thermally-Enhanced DGN Package