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PDF AIC1084CE Data sheet ( Hoja de datos )

Número de pieza AIC1084CE
Descripción 5A Low Dropout Positive Adjustable Regulator
Fabricantes Analog Intergrations Corporation 
Logotipo Analog Intergrations Corporation Logotipo



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AIC1084
5A Low Dropout Positive Adjustable Regulator
n FEATURES
l Dropout Voltage 1.3V at 5A Output Current.
l Fast Transient Response.
l Extremely Tight Line and Load Regulation.
l Current Limiting and Thermal Protection.
l Adjustable Output Voltage or Fixed 1.5V, 1.8V,
3.3V.
l Standard 3-Pin Power Packages.
n APPLICATIONS
l Mother Board I/O Power Supplies.
l Microprocessor Power Supplies.
l High Current Regulator.
l Post Regulator for Switching Supply.
n DESCRIPTION
The AIC1084 is a low dropout three terminal
regulator with 5A output current capability. The
output voltage is adjustable with the use of a
resistor divider or fixed 3.3V. Dropout voltage is
guaranteed to be at maximum of 1.4V with the
maximum output current. Its low dropout voltage
and fast transient response make it ideal for low
voltage microprocessor applications. Current limit
and thermal protection provide protection against
any overload condition that would create excessive
junction temperatures.
n TYPICAL APPLICATION CIRCUIT
VIN 3 AIC1084 2
5V
VOUT
3.3V
C1 +
10µF
1 ADJ
VREF RF1
125
1% +
C2
RF2
205
10µF
1%
Adjustable Voltage Regulator
VREF=VOUT - VADJ =1.25V (typ.)
VOUT=VREF x (1+RF2/RF1)+ IADJ x RF2
IADJ=55µA (typ.)
(1) C1 needed if device is far away from filter
capacitors.
(2) C2 required for stability.
VIN 3
5V
C1 +
10µF
AIC1084-33 2
1
GND
VOUT
3.3V
+
C2
10µF
Fixed Voltage Regulator
Analog Integrations Corporation 4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1084-03 Sep 21, 01
TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
1

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AIC1084CE pdf
AIC1084
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
1.35
1.30
1.25
1.20
1.15
1.10
1.05
01 23 4 5
Output Current (A)
Fig. 3 Dropout Voltage (VOUT=3.3V)
5
4
3
2
1
0
1
23
Fig. 5
45 6 7 8
Differential Voltage (V)
Minimum Operating Current
9
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
1 23 4
Differential Voltage (V)
Fig. 4 Minimum Operating Current
8
7
6
5
4
3
2
1
0
1234567
VIN-VOUT (V)
Fig. 6 AIC1084 (ADJ.) Short Circuit Current
5
-20
-30
-40
-50
-60
-70
-80
101
COUT=3.3µF
COUT=10µF
COUT=25µF
102
Fig. 7
103 104 105
Frequency (Hz)
106
AIC1084 (ADJ.) Ripple Rejection
107
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