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AP1187 Fiches technique(PDF) 5 Page - Anachip Corp

No de pièce AP1187
Description  1A Ultra Low Dropout Positive Adjustable Regulator
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Fabricant  ANACHIP [Anachip Corp]
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AP1187 Fiches technique(HTML) 5 Page - Anachip Corp

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AP1187
1A Ultra Low Dropout Positive Adjustable Regulator
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Aug 23, 2005
5/6
Function Description (Continued)
Thermal Design
The AP1187 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℃, it is 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.
Assuming, the following conditions:
VOUT =2.5V
VIN =3.3V
VCTRL=5V
IOUT =1A DC Avg.
Calculate the maximum power dissipation using the
following equation:
PD= IOUT *(VIN -VOUT) + (IOUT/60) * (VCTRL - VOUT)
PD =1*(3.3-2.5) + (1/60)*(5-2.5) =0.84W
Using table below select the proper package and
the amount of copper board needed.
Package
Copper Area
ΘJA (
oC / W)
Max Pd (Ta=25
oC) Max Pd (Ta=45oC)
SOP7
1.0” X 1.0”
65
1.7W
1.4W
Note: Above table is based on the maximum junction temperature of 135
oC.
As shown in the above table, any of the two packages will do the job. For low cost applications the SOP7 package is
recommended.
Marking Information
1
4
SOP-7L
Logo
Part number
ID code: internal
Year: "01" =2001
"02" =2002
Xth week: 01~52
75
AP1187
YY WW X X
(Top View)
Blank: normal
L: Lead Free Package


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