AIC1084
5A Low Dropout Positive Regulator
FEATURES
Dropout Voltage 1.5V at 5A Output Current.
Fast Transient Response.
Extremely Tight Line and Load Regulation.
Current Limiting and Thermal Protection.
Adjustable Output Voltage or Fixed 1.5V, 1.8V,
2.5V, 3.3V.
Standard 3-Pin Power Packa
ges.
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 1.5V, 1.8V, 2.5V and 3.3V.
Dropout voltage is guaranteed to be at maximum
of 1.5V 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.
APPLICATIONS
Mother Board I/O Power Supplies.
Microprocessor Power Supplies.
High Current Regulator.
Post Regulator for Switching Supply.
TYPICAL APPLICATION CIRCUIT
V
IN
5V
3
AIC1084
1 ADJ
C1 +
10µF
2
V
REF
V
OUT
3.3V
RF1
125Ω
+
1%
C2
RF2
10µF
205Ω
(Note1)
1%
V
REF
=V
OUT
-V
ADJ
=1.25V (typ.)
V
OUT
=V
REF
x (1+RF2/RF1)+ I
ADJ
x RF2
I
ADJ
=55µA (typ.)
(1) C1 needed if device is far away from
filter capacitors.
(2) C2 required for stability.
Adjustable Voltage Regulator
V
IN
5V
3
AIC1084-33
1
2
V
OUT
3.3V
C1 +
10µF
GND
+
C2
10µF
(Note1)
Fixed Voltage Regulator
Analog Integrations Corporation
Si-Soft Research Center
3A1, No.1, Li-Hsin Rd. I , Science Park , Hsinchu 300, Taiwan , R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-1084G-01
073108
1
AIC1084
ORDERING INFORMATION
AIC1084-XXXXXX
PACKING TYPE
TB: TUBE
TR: TAPING & REEL
PACKAGING TYPE
E: TO-252
M: TO-263
T: TO-220
C: COMMERCIAL
P: LEAD FREE COMMERCIAL
G: GREEN PACKAGE
OUTPUT VOLTAGE
DEFAULT: ADJUSTABLE
15: 1.5V
18: 1.8V
25: 2.5V
33: 3.3V
(1.5V version is available under request)
Example: AIC1084-18CETR
1.8V version in TO-252 Package &
Taping & Reel Packing Type
Example: AIC1084-18PMTR
1.8V version in TO-263 Lead Free
Package & Taping & Reel Packing
Type
PIN CONFIGURATION
TO-252
TOP VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
1
2
3
TO-263
TOP VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
1
2
3
TO-220
FRONT VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
1
2
3
ABSOLUTE MAXIMUM RATINGS
VIN pin to ADJ/GND pin
Ambient Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering) 10 sec.
Thermal Resistance Junction to Case
TO-252
TO-263, TO-220
Thermal Resistance Junction to Ambient
TO-252
TO-220
(Assume no ambient airflow, no heatsink) TO-263
7V
–40°C to 85°C
125°C
–65°C ~ 150°C
260°C
12.5°C/W
3°C/W
100°C/W
60°C/W
50°C/W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
2
AIC1084
TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
ELECTRICAL CHARACTERISTICS
(V
IN
=5V, T
J
=25°C, I
O
=10mA, unless otherwise specified) (Note2)
PARAMETER
Reference Voltage
TEST CONDITIONS
AIC1084 (ADJ)
AIC1084-15, V
IN
=5V
AIC1084-18, V
IN
=5V
AIC1084-25, V
IN
=5V
AIC1084-33, V
IN
=5V
ADJ : 2.75V≤ V
IN
≤7V
V
OUT
=1.25V
Fix : V
OUT
+1.5V≤ V
IN
≤7V
Load Regulation
Dropout Voltage
Current Limit
GND Current (Fix)
Adjusted Pin Current
Adjusted Pin Current Change
(∆I
ADJ
)
Temperature Stability
Minimum Load Current
RMS Output Noise (% of V
OUT
)
Ripple Rejection Ratio
Thermal Shutdown Temperature
10Hz
≤
f
≤
10KHz
120Hz input ripple
C
OUT
=25µF
(V
IN
-V
OUT
)=3V
Note 3
60
V
OUT
+1.5V
≤
V
IN
≤
7V
2.75V
≤
V
IN
≤
7V
2.75V
≤
V
IN
≤
7V
I
O
=0.5A
10mA < I
O
< 5A
∆V
OUT
,
∆V
REF
=1%
10mA
≤
I
O
≤
5A
5
1.4
6
11.5
55
0.2
0.5
5
0.003
72
165
10
14
120
5
0.6
1.5
%
V
A
mA
µA
µA
%
mA
%
dB
°C
MIN.
1.225
1.47
1.76
2.45
3.23
TYP.
1.25
1.50
1.80
2.50
3.30
0.015
MAX.
1.275
1.53
1.84
2.55
3.37
0.2
UNIT
V
Output Voltage
V
Line Regulation
%
Note 1:
To avoid output oscillation, aluminum electrolytic output capacitor is recommended and ceramic
capacitor is not suggested.
Note 2:
Specifications are production tested at T
A
=25°C. Specifications over the -40°C to 85°C operating
temperature range are assured by design, characterization and correlation with Statistical Quality
Controls (SQC).
Note 3:
Guarantee by design.
3
AIC1084
TYPICAL PERFORMANCE CHARACTERISTICS
Output Voltage
(mV, AC)
50
0
-50
-100
Input Voltage (V)
C
IN
=1µF (Tantalum)
C
OUT
=10µF (Tantalum)
V
OUT
=3.3V
7.0
6.0
0
40
80
120
160
200
Fig. 1
1.35
1.30
1.25
Load Transient Response
1.8
Fig. 2
Time (µS)
Line Transient Response
Minimun Operating Current (mA)
3
4
AIC1084-25 (T
J
=25℃)
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
0
AIC1084 - ADJ
Dropout Voltage (v)
1.20
1.15
1.10
1.05
1.00
0.95
0.90
1
2
2
4
6
8
Output Current (A)
Fig. 3 Dropout Voltage (V
OUT
=2.5)
5
10
V
IN
-V
OUT
(V)
Fig. 4 Minimum Operating Current
Minimum
Operating Current (mA)
9
AIC1084-18
4
8
Shot Circuit Current (A)
1
2
3
4
5
6
7
8
9
7
6
5
4
3
2
1
3
2
1
0
0
1
Differential Voltage (V)
Fig. 5
Minimum Operating Current
2
3
4
5
6
7
8
V
IN
-V
OUT
(V)
Fig. 6 AIC1084 (1.8) Short Circuit Current
4
AIC1084
TYPICAL PERFORMANCE CHARACTERISTICS
-20
(Continued)
Ripple Rejection Ratio (dB)
-30
-40
-50
-60
-70
-80
1
10
2
10
3
10
4
10
C
OUT
=3.3µF
C
OUT
=10µF
C
OUT
=25µF
Frequency (Hz)
5
10
6
10
7
10
Fig. 7
AIC1084 (ADJ.) Ripple Rejection
BLOCK DIAGRAM
VIN
V
REF
+
1.25V
+
GM
Current Amp.
-
Thermal
Limit
55µA
Current
Limit
VOUT
For fixed voltage
device
ADJ
GND
PIN DESCRIPTIONS
ADJ PIN
-
Providing V
REF
=1.25V (typ.) for adjustable V
OUT
. V
REF
=V
OUT
-V
ADJ
and I
ADJ
=55µA (typ.)
(GND PIN- Power ground.)
VOUT PIN -
VIN PIN
-
Adjustable output voltage.
Power Input.
5
