Data Sheet

12

Rev. 1.1, 2014-07-03

TLE42664

Application Information

R

= (150 °C – 105 °C) / 0.479 W

= 93.9 K/W

As a result, the PCB design must ensure a thermal resistance

R

TLE42664G (PG-SOT223-4 package) and according to “Thermal Resistance” on Page 6, at least 300 mm²

heatsink area is needed on the FR4 1s0p PCB, or the FR4 2s2p board can be used.

6.4

Reverse Polarity Protection

TLE42664 is self protected against reverse polarity faults and allows negative supply voltage. External reverse

polarity diode is not needed. However, the absolute maximum ratings of the device as specified in “Absolute

Maximum Ratings” on Page 5 must be kept.

The reverse voltage causes several small currents to flow into the IC hence increasing its junction temperature.

As the thermal shut down circuitry does not work in the reverse polarity condition, designers have to consider this

in their thermal design.