AP1184 データシートの表示（PDF） - Diodes Incorporated.

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AP1184

4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR FIXED-MODE REGULATOR

Diodes Incorporated. 

AP1184

4A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR

FIXED-MODE REGULATOR

Functional Descriptions ( Continued )

Assuming, the following conditions:

Vout = 2.5V

Vin = 3.3V

Vctrl = 5V

Iout = 2A DC Avg.

Calculate the maximum power dissipation using the following equation:

Pd = Iout * ( Vin - Vout) + ( Iout /60) * ( Vctrl - Vout )

Pd = 2 * (3.3-2.5) + (2/60) * (5-2.5) = 1.68W

Using table below select the proper package and the amount of copper board needed.

Package

Copper Area

SOP-8L

1.0” X 1.0”

TO263-3L Pad Size-1.4”X1.4”

θJA (oC/W)

65

25-45

Max Pd (TA = 25oC)

1.7W

2.4W-4.4W

Max Pd (TA = 45oC)

1.4W

2.0W-3.6W

Note:

6. Above table is based on the maximum junction temperature of 135oC.

As shown in the above table, any of the two packages will do the job. For low cost applications the SOP-8L package is recommended.

AP1184 Rev. 1

7 of 12

www.diodes.com

MARCH 2007

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