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AIC1086 Datasheet(PDF) 7 Page - Analog Intergrations Corporation

Part No. AIC1086
Description  1.5A Low Dropout Positive Regulator
Download  11 Pages
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Manufacturer  AIC [Analog Intergrations Corporation]
Direct Link  http://www.analog.com.tw
Logo AIC - Analog Intergrations Corporation

AIC1086 Datasheet(HTML) 7 Page - Analog Intergrations Corporation

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AIC1086
7
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS
Linear
regulators
require
input
and
output
capacitors to maintain stability. Input capacitor at
10
F with a 10F aluminum electrolytic output
capacitor is recommended.
POWER DISSIPATION
The AIC1086 obtains thermal-limiting circuitry,
which is designed to protect the device against
overload
condition.
For
continuous
load
condition,
maximum
rating
of
junction
temperature must
not
be
exceeded.
It
is
important to pay more attention in thermal
resistance. It includes junction to case, junction
to ambient. The maximum power dissipation of
AIC1086 depends on the thermal resistance of
its case and circuit board, the temperature
difference between the die junction and ambient
air, and the rate of airflow. The rate of
temperature rise is greatly affected by the
mounting pad configuration on the PCB, the
board material, and the ambient temperature.
When the IC mounting with good thermal
conductivity is used, the junction temperature
will be low even when large power dissipation
applies.
The power dissipation across the device is
P = IOUT (VIN-VOUT).
The maximum power dissipation is:
JA
A
max
-
J
MAX
R
θ
)
T
-
(T
P
Where TJ-max is the maximum allowable junction
temperature (125
C), and T
A
is the ambient
temperature suitable in application.
As a general rule, the lower temperature is, the
better reliability of the device is. So the PCB
mounting pad should provide maximum thermal
conductivity to maintain low device temperature.
APPLICATION EXAMPLES
125
R1
205
R2
+
10uF
C2
+
10uF
C1
MMBT2222A
1k
R3
1k
R4
Vin
Vout
AIC1086
3
1 ADJ
2
5V
3.3V
TTL
125
R1
205
R2
+
100uF
C2
+
10uF
C1
Vin
Vout
AIC1086
3
1 ADJ
2
Cadj
5V
3.3V
* Cadj can improve ripple rejection
Fig. 8 VOUT=3.3V with Shutdown
Fig. 9 Improving Ripple Rejection
125
R1
+
10uF
C2
+
10uF
C1
Vin
Vout
AIC1086
3
1 ADJ
2
5V
1.25V
+
100uF
C2
+
10uF
C1
Vout
AIC1086-33
3
1
2
-3.3V
D1
T1
Vin
FLOATING INPUT
Fig. 10 VOUT=1.25V Application Circuit
Fig. 11 Low Dropout Negative Supply


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