AIC1085
3A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
SPEC NO: DS-1085-01 FEB 02, 01
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500
FAX:(8863)577-2510
1
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FEATURES
l
Dropout Voltage 1.3V at 3A Output Current.
l
Fast Transient Response.
l
Extremely Tight Line and Load Regulation.
l
Internal Thermal and Current Limiting.
l
Adjustable Output Voltage or Fixed 1.5V, 1.8V,
3.3V.
l
Standard 3-Pin Power Packages.
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APPLICATIONS
l
Mother Board I/O Power Supplies.
l
Microprocessor Power Supplies.
l
High Current Regulator.
l
Post Regulator for Switching Supply.
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DESCRIPTION
The AIC1085 is a low dropout three terminal
regulator with 3A output current capability. The
output voltage is adjustable with the use of a resistor
divider or fixed 1.5V, 1.8V, and 3.3V. Dropout is
guaranteed at a maximum of 1.4V at maximum
output current. Its low dropout voltage and fast
transient response make it ideal for low voltage
microprocessor applications. Internal current and
thermal limiting provides protection against any
overload condition that would create excessive
junction temperatures.
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TYPICAL APPLICATION CIRCUIT
C2
10
F
V
OUT
3.3V
V
IN
5V
+
+
V
REF
RF2
205
1%
ADJ
AIC1085
C1
10
F
2
3
1
RF1
125
1%
V
R E F
=V
OUT
- V
ADJ
=1.25V (typ.)
V
OUT
=V
REF
x (1+RF2/RF1)+ I
ADJ
x RF2
I
ADJ
=55
A (typ.)
(1) C1 needed if device is far away from
filter capacitors.
(2) C2 required for stability.
Adjustable Voltage Regulator
C2
10
F
V
OUT
3.3V
V
IN
5V
+
+
GND
C1
10
F
AIC1085-33
2
1
3
Fixed Voltage Regulator
AIC1085
3A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
SPEC NO: DS-1085-01 FEB 02, 01
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500
FAX:(8863)577-2510
2
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ORDERING INFORMATION
ORDER NUMBER
PIN CONFIGURATION
PACKAGING TYPE
E: TO-252
M: TO-263
T: TO-220
FRONT VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
AIC1085CT
(TO-220)
1
2 3
FRONT VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
AIC1085CM
(TO-263)
2
3
1
FRONT VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
AIC1085CE
(TO-252)
2
3
1
AIC1085-XXXX
TEMPERATURE RANGE
C: 0
C~70
C
OUTPUT VOLTAGE
DEFAULT: ADJ.
15: 1.5V
18: 1.8V
33: 3.3V
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ABSOLUTE MAXIMUM RATINGS
Vin pin to ADJ/ GND pin .................
......... ... .................. ... ... ... ... ..........................
7V
Operating Junction Temperature Range
..................... ... ... ......................
0
C~ 125
C
Storage Temperature Range
.................................. ... ... ... .................
- 65
C ~ 150
C
Thermal Resistance Junction to Case TO-252
... ... ... ... ... ... ... ... .... ... ... ... ... 15
C/W
TO-263, TO-220 ... ... ... .
.............. ... ... ...
6
C /W
Thermal Resistance Junction to Ambient TO-252
... ... ... ... ... ... ... ... ... ... ..... 100
C/W
(Assume no ambient airflow, no heatsink) TO-263 ... .
....... ... ........ ... ... ... ... ...
60
C /W
TO-220 ... .
...... ... ....... ... ... ... ... ... ..
50
C /W
Lead Temperature (Soldering) 10 sec.
........................ ... ... ............... ... ..... .......
260
C
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TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
AIC1085
3A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
SPEC NO: DS-1085-01 FEB 02, 01
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500
FAX:(8863)577-2510
3
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ELECTRICAL CHARACTERISTICS
(V
IN
=5V, T
A
=25
C, I
O
=10mA, Unless otherwise
specified)
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Reference Voltage (V
OUT
-V
ADJ
)
AIC1085 (Adj.)
T
A
=25
C
1.238
1.25
1.262
V
Output Voltage
AIC1085-15 V
IN
=5V
AIC1085-18 V
IN
=5V
AIC1085-33 V
IN
=5V
1.48
1.78
3.26
1.50
1.80
3.30
1.52
1.82
3.34
V
Line Regulation
Adj : 2.75V
V
IN
5.25V
%
Fix : V
OUT
+1V
V
IN
7V
T
A
=25
C
0.015
0.2
Load Regulation
10mA < I
O
< 3
A
T
A
=25
C
0.6
%
Dropout Voltage
V
OUT
,
V
REF
=1%
10mA
I
O
3A
0
C
T
J
125
C
1.3
1.4
V
Current Limit
V
IN
= 5V
0
C
T
J
125
C
3
4
A
Adjusted Pin Current (I
ADJ
)
2.75V
V
IN
7V
55
120
A
Adjusted Pin Current Change
(
I
ADJ
)
2.75V
V
IN
7V
0
C
T
J
125
C
0.2
5
A
Temperature Stability
I
O
=0.5A
0
C
T
J
125
C
0.5
%
Minimum Load Current
0
C
T
J
125
C
5
10
mA
RMS Output Noise (% of V
OUT
)
10Hz
f
10KHz
0.003
%
Ripple Rejection Ratio
120Hz input ripple
C
OUT
=25
F
(V
IN
-V
OUT
)=3V
60
72
dB
AIC1085
3A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
SPEC NO: DS-1085-01 FEB 02, 01
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500
FAX:(8863)577-2510
4
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BLOCK DIAGRAM
V
IN
55
A
ADJ
V
REF
1.25V
-
+
GM
+
Thermal
Limit
Current Amp.
V
OUT
GND
For fixed voltage
device
Current
Limit
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PIN DESCRIPTIONS
ADJ PIN
-
Providing V
REF
=1.25V (typ.) for
adjustable V
OUT
. V
REF
=V
OUT
-V
ADJ
and I
ADJ
=55
A (typ.)
(GND PIN -
Power Ground.)
VOUT PIN -
Adjustable output voltage.
VIN PIN
-
Power Input.
AIC1085
3A LOW DROPOUT POSITIVE ADJUSTABLE REGULATOR
SPEC NO: DS-1085-01 FEB 02, 01
ANALOG INTEGRATIONS CORPORATION
www.analog.com.tw
4F, 9 Industry E. 9th Road, Science-based Industrial Park , Hsinchu, Taiwan, R.O.C.
TEL: (8863)577-2500
FAX:(8863)577-2510
5
n
TYPICAL PERFORMANCE CHARACTERISTICS
Load Current
Load Transient Response
Time (
S)
0
40
80
120
160
200
0.1A
1.5A
-0.1
-0.05
0
0.05
0.1
Output Voltage
(V, AC)
V
IN
=5V
C
IN
=1
F
C
OUT
=10
F (Tantalum)
V
OUT
=3.3V
Line Transient Response
Time (
S)
Output Voltage
(
mV, AC)
Input Voltage (V)
0
10
20
30
40
50
6.0
7.0
--100
--50
0
50
C
OUT
=10
F (Tantalum)
V
OUT
=3.3V
Dropout Voltage (VOUT=3.3V)
Output Current (A)
Minimum Differential Voltage (V)
0.0
0.5
1.0
1.5
2.0
2.5
3.0
1.06
1.08
1.10
1.12
1.14
1.16
1.18
1.20
1.22
Minimum Operating Current
Differential Voltage (V)
Minimum Operating Current (
mA)
0
1
2
3
4
5
0.2
0.4
0.6
0.8
1.0
1.2
1.4
1.6
1.8
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