FP8103

This datasheet contains new product information.

Feeling Technology reserves the rights to modify the product specification without notice.

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Rev. 0.70

15/19

Power Dissipation

The conditions that cause the FP8103 to reduce charge current through thermal feedback can be

approximated by considering the power dissipated in the IC. For high charge current, the FP8103

power dissipation is approximately:

because the FP8103 will automatically reduce the charge current to maintain the die temperature

under 145°C approximately. The approximate ambient temperature at which the thermal feedback

begins to protect the IC is:

=145

For example: Consider an FP8103 operating from a 5V wall adapter providing 1A to a 3.6V Li-Ion

battery. The ambient temperature above which the FP8103 will begin to reduce the 1A charge current

is approximately:

= 145°C

– 1.4W • 50°C/W = 145°C – 70°C

= 75°C

The FP8103 can be used above 75°C, but the charge current will be reduced to smaller than

1000mA. The approximate current at a given ambient temperature can be calculated:

JA

•

BAT)

A

θ

V

-

Vcc

(

T

-

C

°

145

Using the previous example with an ambient temperature of 90°C, the charge current will be

reduced to approximately:

(

)

C/W

°

50

3.6V

-

V

5

C

°

90

-

C

°

145

•

=

C/A

°

70

C

°

55

= 785mA