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PDF AP1184 Data sheet ( Hoja de datos )
| Número de pieza | AP1184 | |
| Descripción | 4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator | |
| Fabricantes | Anachip | |
| Logotipo |  |
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4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
AP1184
Feature
• 0.7V maximum dropout voltage at 4A load current
• Built-in Thermal shutdown
• Output current limiting
• Adjustable or fixed output voltage
1.5V, 1.8V, 2.5V, 3.3V, 5.0V
• Fast transient response
• Good noise rejection
• Packages: SOP-7L, TO220-5L and TO263-5L
General Description
AP1184 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 X
Low Dropout Regulator Package
Vout
S7:SOP-7L
K5:TO263-5L
T5:TO220-5L
Blank : Adj
15 = 1.5V
18 = 1.8V
25 = 2.5V
33 = 3.3V
50 = 5.0V
Lead Free
Blank : Normal
L : Lead Free Package
Packing
Blank : Tube
A : Taping
Typical Application
3.3V
+
470uF
5V
+
470uF
GND
NC
Vsense Vout
Vctrl
Vout
Vin Vin
AP1184-2.5V
2.5V/4A
+
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
1/11
1 page  
4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
Functional Descriptions(Continued)
AP1184
Vout = Vref (1+R2/R1) + Iadj * R2 where : Vref = 1.25V & Iadj=50uA Typically
Vin
Vctrl
AP1184-ADJ
Vsense
Adj Vref
R1+
Vout
Iadj=50uA
R2+
The AP1184-ADJ keeps a constant 1.25V between
the Vsense pin and the Adj pin. By placing a
resistor R1 across these two pins and connecting
the Vsense ans Vout pin together, a constant
current flows through R1, adding to the Iadj current
and into the R2 resistor producing a voltage equal
to the (1.25/R1)*R2 + Iadj*R2. This voltage is then
added to the 1.25V to set the output voltage. This is
summarized in the above equation. Since the
minimum load current requirement of the
AP1184-ADJ is 10mA, R1 is typically selected to be
a 121Ω resistor so that it automatically satisfies
this condition. Notice that since the Iadj is typically
in the range of 50uA it only adds a small error to the
output voltage and should be considered when very
precise output voltage setting is required.
Load Regulation
Since the AP1184 has separate pins for the output
(Vout) and the sense (Vsense), it is ideal for
providing true remote sensing of the output voltage
at the load. This means that the voltage drops due
to parasitic resistance such as PCB traces between
the regulator and the load are compensated for
using remote sensing. Figure following shows a
typical application of the AP1184-ADJ with remote
sensing.
Vin
Vctrl
Vin
Vctrl
Vout
AP1184-ADJ
Vsense
Adj
R1
R2
RL
Stability
The AP1184-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 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 AP1184-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.
Anachip Corp.
www.anachip.com.tw
Rev.1.1 Sep 7, 2004
5/11
5 Page 
4A Ultra Low Dropout Positive Adjustable or Fixed-mode Regulator
(3). Package Type: SOP-7L
AP1184
C2 C3
A
C1
C
β
B1 B2
Ee
D
F
Symbol
A
B1
B2
C
C1
C2
C3
D
E
e
F
β
Dimensions In Millimeters
Min.
Nom.
Max.
5.79
5.99
6.19
3.83
3.91
3.99
3.78
3.86
3.94
4.80
4.87
4.94
1.57
1.67
1.77
0.32 0.4 0.48
1.17
1.27
1.37
0.19
0.22
0.25
1.04REF
0.48
0.68
0.88
1.35
1.45
1.55
7o
Dimensions In Inches
Min.
Nom.
Max.
0.228
0.151
0.149
0.189
0.062
0.013
0.046
0.007
0.019
0.053
0.236
0.154
0.152
0.192
0.066
0.016
0.050
0.009
0.041REF
0.027
0.057
7o
0.244
0.157
0.155
0.194
0.070
0.019
0.054
0.010
0.035
0.061
Anachip Corp.
www.anachip.com.tw
11/11
Rev.1.1 Sep 7, 2004
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AP1184.PDF ] | |
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