TLE42664

Application Information

Data Sheet

11

Rev. 1.1, 2014-07-03

TLE42664 is designed to be stable with extremely low ESR capacitors. According to the automotive environment,

ceramic capacitors with X5R or X7R dielectrics are recommended.

The output capacitor should be placed as close as possible to the regulator’s output and GND pins and on the

same side of the PCB as the regulator itself.

In case of rapid transients of input voltage or load current, the capacitance should be dimensioned in accordance

and verified in the real application that the output stability requirements are fulfilled.

6.3

Thermal Considerations

Knowing the input voltage, the output voltage and the load profile of the application, the total power dissipation

can be calculated:

(1)

with

•

P

•

V

•

V

•

I

•

I

The maximum acceptable thermal resistance

R

(2)

with

•

T

•

T

Based on the above calculation the proper PCB type and the necessary heat sink area can be determined with

reference to the specification in “Thermal Resistance” on Page 6.

Example

Application conditions:

V

V

I

T

Calculation of

R

P

= (13.5 V – 5 V) • 50 mA + 13.5 V • 4 mA

= 0.425 W + 0.054 W

=0.479 W

–

() I

Q

×

+

×

=

,

,

–

----------------------------

=