TLV4110, TLV4111, TLV4112, TLV4113

FAMILY OF HIGH OUTPUT DRIVE OPERATIONAL

AMPLIFIERS WITH SHUTDOWN

SLOS289A – DECEMBER 1999 – REVISED APRIL 2000

14

POST OFFICE BOX 655303

APPLICATION INFORMATION

general PowerPAD design considerations (continued)

1.

Prepare the PCB with a top side etch pattern as shown in Figure 28. There should be etch for the leads as

well as etch for the thermal pad.

2.

Place five holes (dual) or nine holes (quad) in the area of the thermal pad. These holes should be 13 mils

in diameter. Keep them small so that solder wicking through the holes is not a problem during reflow.

3.

Additional vias may be placed anywhere along the thermal plane outside of the thermal pad area. This helps

dissipate the heat generated by the TLV411x IC. These additional vias may be larger than the 13-mil

diameter vias directly under the thermal pad. They can be larger because they are not in the thermal pad

area to be soldered so that wicking is not a problem.

4.

Connect all holes to the internal ground plane.

5.

When connecting these holes to the ground plane, do not use the typical web or spoke via connection

methodology. Web connections have a high thermal resistance connection that is useful for slowing the heat

transfer during soldering operations. This makes the soldering of vias that have plane connections easier.

In this application, however, low thermal resistance is desired for the most efficient heat transfer. Therefore,

the holes under the TLV411x PowerPAD package should make their connection to the internal ground plane

with a complete connection around the entire circumference of the plated-through hole.

6.

The top-side solder mask should leave the terminals of the package and the thermal pad area with its five

holes (dual) or nine holes (quad) exposed. The bottom-side solder mask should cover the five or nine holes

of the thermal pad area. This prevents solder from being pulled away from the thermal pad area during the

reflow process.

7.

Apply solder paste to the exposed thermal pad area and all of the IC terminals.

8.

With these preparatory steps in place, the TLV411x IC is simply placed in position and run through the solder

reflow operation as any standard surface-mount component. This results in a part that is properly installed.

For a given

P

D +

T

MAX

–T

A

q

JA

Where:

= Maximum power dissipation of TLV411x IC (watts)

= Free-ambient air temperature (

°C)