AP1186T5-50G-U Diodes Inc, AP1186T5-50G-U Datasheet - Page 6

• Manufacturer Part Number: AP1186T5-50G-U
• Description: Low Dropout (LDO) Regulators FIXED-MODE 15V 1.5A
• Manufacturer: Diodes Inc

Specifications of AP1186T5-50G-U

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Function Descriptions
Stability
The AP1186-XXX requires the use of an output capacitor as part
of the frequency compensation in order to make the regulator
stable. Typical designs for the microprocessor applications use
standard electrolytic capacitors with typical ESR in the range of
50 to 100mΩ and an output capacitance of 100uF to 1000uF.
Thermal Design
The AP1186-XXX incorporates an internal thermal shutdown that
protects the device when the junction temperature exceeds the
allowable maximum junction temperature. Although this device
can operate with junction temperatures in the range of 150
recommended that the selected heat sink be chosen such that
during maximum continuous load operation the junction
temperature is kept below this number. The example below
shows the steps in selecting the proper surface mount package.
Note: Above table is based on the maximum junction temperature of 135
the job.
AP1186 Rev. 1 - 0
Package
Assuming, the following conditions:
Vout = 2.5V
TO263
Pad Size-1.4”X1.4”
Copper Area
(Continued)
1.5A ULTRA LOW DROPOUT POSITIVE ADJUSTABLE OR
Θ
JA
www.diodes.com
25-45
(
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C/W)
C, it is
6 of 9
Max Pd ( Ta = 25
Fortunately as the capacitance increases, the ESR decreases
resulting in a fixed RC time constant. The AP1186-XXX takes
advantage of the phenomena in making the overall regulator loop
stable.
For most applications a minimum of 100uF aluminum electrolytic
capacitor insures both stability and good transient response.
following equation:
amount of copper board needed.
o
C. As shown in the above table, any of the two packages will do
Vin = 3.3V
Vctrl = 5V
Iout = 1.5A DC Avg.
Calculate the maximum power dissipation using the
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
2.4W-4.4W
FIXED-MODE REGULATOR
o
C )
Max Pd ( Ta = 45
2.0W-3.6W
©
AP1186
Diodes Incorporated
MARCH 2007
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C )