AP1186 ANACHIP [Anachip Corp], AP1186 Datasheet - Page 6

• Manufacturer Part Number: AP1186
• Description: 1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
• Manufacturer: ANACHIP [Anachip Corp]

1.5A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
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
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
Anachip Corp.
www.anachip.com.tw
o
Functional Descriptions (Continued)
Marking Information
C, it is recommended that the selected heat
As shown in the above table, any of the two packages will do the job.
Package
TO263
Pad Size-1.4”X1.4”
Copper Area
1186-XX
YYWWX X
TO263-5L,TO220-5L
Θ
JA
25-45
(
o
C/W)
6/8
Blank : Adj, 15=1.5V,
18=1.8V, 25=2.5V,
33=3.3V, 50=5.0V
ID Code
Xth Week : 01~52
Year : "01"=2001
the following equation:
and the amount of copper board needed.
Blank : normal
L : Lead Free Package
o
C.
Assuming, the following conditions:
Vout=2.5V
Vin=3.3V
Vctrl=5V
Iout=1.5A DC Avg.
Calculate the maximum power dissipation using
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
"02"=2002
Max Pd (Ta=25
2.4W-4.4W
o
C) Max Pd (Ta=45
2.0W-3.6W
AP1186
Rev.1.1 Sep.7, 2004
o
C)