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PDF AP1184P Data sheet ( Hoja de datos )
| Número de pieza | AP1184P | |
| Descripción | 4A Ultra Low Dropout Positive Adjustable Regulator | |
| Fabricantes | Anachip | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de AP1184P (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
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4A Ultra Low Dropout Positive Adjustable Regulator
AP1184Pwww.DataSheet4U.com
Feature
• 0.7V maximum dropout voltage at 4A load current
• Built-in Thermal shutdown
• Output current limiting
• Adjustable output voltage
• Fast transient response
• Good noise rejection
• Packages: SOP-7L
General Description
AP1184P is a 4A regulator with extremely low
dropout voltage. This product is specifically
designed to provide well regulated supply for
applications requiring 2.8V or lower voltages from
3.3V ATX power supplies where high efficiency of
the switch can be achieved without the cost and
complexity associated with switching regulator. One
such application is the new graphic chipsets that
requires anywhere from 2.4V to 2.7V supply.
Ordering Information
AP1184 X X X
Low Dropout Regulator Package
P7:SOP-7L
Lead Free
Blank : Normal
L : Lead Free Package
Packing
Blank : Tube
A : Taping
Typical Application
3.3V
+
470uF
5V
+
470uF
Adj NC
Vsense Vout
NC Vout
Vctrl
Vin
AP1184P
2.5V/4A
121Ω
121Ω
+
470uF
This datasheet contains new product information. Anachip Corp. reserves the rights to modify the product specification without notice. No liability is assumed as a result of the use of
this product. No rights under any patent accompany the sale of the product.
Rev.1.1 Sep 7, 2004
1/8
1 page  
4A Ultra Low Dropout Positive Adjustable Regulator
Functional Descriptions(Continued)
Vin
Vctrl
Vin
Vctrl
Vout
AP1184P-ADJ
Vsense
Adj
R1
R2
AP1184Pwww.DataSheet4U.com
RL
Stability
The AP1184P-Adj 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 100m Ω and an output capacitance of
100uF to 1000uF. Fortunately as the capacitance
increases, the ESR decreases resulting in a fixed
RC time constant. The AP1184P-Adj 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.
Thermal Design
The AP1184P-Adj 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
150oC, 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=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
SOP7
Copper Area
1.0” X 1.0”
θJA (oC/W)
65
Max Pd (Ta=25oC)
1.7W
Note: Above table is based on the maximum junction temperature of 135oC.
As shown in the above table, the SOP7 package meets the requirement.
Max Pd (Ta=45oC)
1.4W
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
5/8
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet AP1184P.PDF ] | |
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