AIC1084
5A Low Dropout Positive Regulator
FEATURES
DESCRIPTION
Dropout Voltage 1.5V at 5A Output Current
The AIC1084 is a low dropout three terminal
Fast Transient Response
regulator with 5A output current capability. The
Extremely Tight Line and Load Regulation
output voltage is adjustable with the use of a
Current Limiting and Thermal Protection
resistor divider or fixed 1.8V, 2.5V and 3.3V.
Adjustable Output Voltage or Fixed 1.8V, 2.5V,
Dropout voltage is guaranteed to be at maximum of
3.3V
1.5V with the maximum output current. Its low
Standard 3-Pin Power Packages
dropout voltage and fast transient response make it
ideal for low voltage microprocessor applications.
APPLICATIONS
Current limit and thermal protection provide
Mother Board I/O Power Supplies
protection against any overload condition that
Microprocessor Power Supplies
would create excessive junction temperatures.
High Current Regulator
Post Regulator for Switching Supply
TYPICAL APPLICATION CIRCUIT
3
VIN
5V
AIC1084
1 ADJ
C1 +
10µF
2
VOUT
3.3V
RF1
125Ω
+
1%
C2
RF2
10µF
205Ω
(Note1)
1%
VREF
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.
Adjustable Voltage Regulator
3
VIN
5V
AIC1084-33
2
VOUT
3.3V
1
C1 +
10µF
+
C2
10µF
(Note1)
GND
Fixed Voltage Regulator
Analog Integrations Corporation
Si-Soft Research Center
1A1, 1 Li-Hsin 1st Rd., Science Park, Hsinchu 300, Taiwan, R.O.C.
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
DS-1084G-02
20170718
1
AIC1084
ORDERING INFORMATION
AIC1084-XXXXXX
PIN CONFIGURATION
TO252-3
TOP VIEW
PACKING TYPE
TB: TUBE
TR: TAPING & REEL
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
PACKAGING TYPE
E: TO252-3
M: TO263-3
T: TO220-3
1
2
3
1
2
3
1
2
3
TO263-3
TOP VIEW
G: GREEN PACKAGE
OUTPUT VOLTAGE
DEFAULT: ADJUSTABLE
18: 1.8V
25: 2.5V
33: 3.3V
Example: AIC1084-18GETR
1.8V version in TO252-3 Green
Package & Taping & Reel Packing
Type
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
TO220-3
FRONT VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
Example: AIC1084-18GMTR
1.8V version in TO263-3 Green
Package & Taping & Reel Packing
ABSOLUTE MAXIMUM RATINGS
VIN pin to ADJ/GND pin
7V
Ambient Temperature Range
–40°C to 85°C
Maximum Junction Temperature
125°C
Storage Temperature Range
–65°C ~ 150°C
Lead Temperature (Soldering) 10 sec.
Thermal Resistance Junction to Case
260°C
TO252-3
12.5°C/W
TO263-3, TO220-3
Thermal Resistance Junction to Ambient
3°C/W
TO252-3
100°C/W
(Assume no ambient airflow, no heatsink) TO263-3
60°C/W
TO220-3
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
(VIN=5V, TJ=25°C, IO=10mA, unless otherwise specified) (Note2)
PARAMETER
Reference Voltage
Output Voltage
Line Regulation
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
AIC1084 (ADJ)
1.225
1.25
1.275
V
AIC1084-18, VIN=5V
AIC1084-25, VIN=5V
AIC1084-33, VIN=5V
ADJ : 2.75V≤ VIN ≤7V
VOUT=1.25V
1.76
2.45
3.23
1.80
2.50
3.30
1.84
2.55
3.37
V
0.015
0.2
%
0.6
%
1.5
V
Fix : VOUT+1.5V≤ VIN ≤7V
Load Regulation
10mA < IO < 5A
Dropout Voltage
∆VOUT, ∆VREF=1%
10mA ≤ IO ≤ 5A
Current Limit
1.4
5
GND Current (Fix)
VOUT+1.5V ≤ VIN ≤ 7V
Adjusted Pin Current
6
A
11.5
14
mA
2.75V ≤ VIN ≤ 7V
55
120
µA
Adjusted Pin Current Change
(∆IADJ)
2.75V ≤ VIN ≤ 7V
0.2
5
µA
Temperature Stability
IO=0.5A
0.5
Minimum Load Current
5
RMS Output Noise (% of VOUT)
10Hz ≤ f ≤ 10KHz
Ripple Rejection Ratio
120Hz input ripple
COUT=25µF
(VIN -VOUT)=3V
Thermal Shutdown Temperature
Note 3
60
%
10
mA
0.003
%
72
dB
165
°C
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 TA=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
Output Voltage
(mV, AC)
TYPICAL PERFORMANCE CHARACTERISTICS
50
0
-50
Input Voltage (V)
-100
CIN=1µF (Tantalum)
COUT=10µF (Tantalum)
VOUT=3.3V
7.0
6.0
0
40
80
Fig. 2
1.35
Dropout Voltage (v)
1.25
1.20
1.15
1.10
1.05
1.00
0.95
0.90
2
1
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0.0
4
3
AIC1084 - ADJ
1.6
0
2
Output Current (A)
4
6
8
VIN-V OUT (V)
Fig. 4 Minimum Operating Current
Fig. 3 Dropout Voltage (VOUT=2.5)
10
5
9
4
AIC1084-18
8
Shot Circuit Current (A)
Minimum Operating Current (mA)
200
160
1.8
AIC1084-25 (TJ=25℃)
Minimun Operating Current (mA)
1.30
120
Time (µS)
Line Transient Response
3
2
1
7
6
5
4
3
2
1
0
1
2
3
4
5
6
7
Differential Voltage (V)
Fig. 5
Minimum Operating Current
8
9
0
1
2
3
4
5
6
7
8
VIN-VOUT (V)
Fig. 6 AIC1084 (1.8) Short Circuit Current
4
AIC1084
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
-20
Ripple Rejection Ratio (dB)
COUT=3.3µF
-30
-40
COUT=10µF
-50
-60
-70
COUT=25µF
-80
1
10
2
10
4
10
3
10
5
10
6
10
7
10
Frequency (Hz)
Fig. 7
AIC1084 (ADJ.) Ripple Rejection
BLOCK DIAGRAM
VIN
+
GM
VREF +
1.25V
Current Amp.
-
Thermal
Limit
Current
Limit
55µA
VOUT
For fixed voltage
device
ADJ
GND
PIN DESCRIPTIONS
ADJ PIN
-
Providing VREF=1.25V (typ.) for adjustable VOUT. VREF=VOUT-VADJ and IADJ=55µA (typ.)
(GND PIN- Power ground.)
VOUT PIN -
Adjustable output voltage.
VIN PIN
Power Input.
-
5
AIC1084
APPLICATION INFORMATION
INPUT-OUTPUT CAPACITORS
mounting pad configuration on the PCB, the
Linear regulators require input and output
board material, and the ambient temperature.
capacitors to maintain stability. Input capacitor at
When the IC mounting with good thermal
10µF with a 10µF aluminum electrolytic output
conductivity is used, the junction temperature will
capacitor is recommended.
be low even when large power dissipation
applies.
POWER DISSIPATION
The power dissipation across the device is
The AIC1084 obtains thermal-limiting circuitry,
P = IOUT (VIN-VOUT).
which is designed to protect the device against
overload
condition.
condition,
maximum
For
continuous
rating
of
The maximum power dissipation is:
load
PMAX =
junction
temperature must not be exceeded. It is
(TJ-max - TA )
Rθ JA
important to pay more attention in thermal
Where TJ-max is the maximum allowable junction
resistance. It includes junction to case, junction
temperature (125°C), and TA is the ambient
to ambient. The maximum power dissipation of
temperature suitable in application.
AIC1084 depends on the thermal resistance of
As a general rule, the lower temperature is, the
its case and circuit board, the temperature
better reliability of the device is. So the PCB
difference between the die junction and ambient
mounting pad should provide maximum thermal
air, and the rate of airflow. The rate of
conductivity to maintain low device temperature.
temperature rise is greatly affected by the
APPLICATION EXAMPLES
3
Vin
5V
AIC1084
+ C1
2
1 ADJ
3.3V
+ C1
+ C2
2
AIC1084
Vout
3.3V
R1
125
1 ADJ
10µF
MMBT2222A
TTL
+ C2
100µF
10µF
10µF
R3
1K
Vout
R1
125
3
Vin
5V
R2
205
Cadj
R2
205
R4
1k
* Cadj can improve ripple rejection
Fig. 8 VOUT=3.3V with Shutdown
Fig. 9 Improving Ripple Rejection
T1
3
Vin
5V
+ C1
AIC1084
1 ADJ
2
R1
125
10µF
Vout
1.25V
D1
3
Vin
+ C2
+ C1
10µF
10µF
AIC1084-33 2
1
FLOATING INPUT
Fig. 10 VOUT=1.25V Application Circuit
+ C2
100µF
Vout
-3.3V
Fig. 11 Low Dropout Negative Supply
6
AIC1084
PHYSICAL DIMENSIONS
TO220-3
A
A1
E1
THERMAL PAD
H1
Q
E
L
L1
D1
D
D2
P
A
b2
A
e
A2
S
Y
M
B
O
L
b
c
WITH PLATING
BASE METAL
SECTION A-A
Note: 1. Refer to JEDEC TO-220AB.
2. Dimension "E" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side .
3. Dimension "D1" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
TO220-3
MILLIMETERS
MIN.
MAX.
A
3.56
4.82
A1
0.51
1.39
A2
2.04
2.92
b
0.38
1.01
b2
1.15
1.77
c
0.35
0.61
D
14.23
16.51
D1
8.38
9.02
D2
11.75
12.88
E
9.66
10.66
E1
6.86
e
H1
L
8.90
2.54 BSC
5.85
6.85
12.70
14.73
L1
--
6.35
P
3.54
4.08
Q
2.54
3.42
7
AIC1084
TO252-3
A
E
c2
E1
THERMAL PAD
L4
H
D
D1
L3
b3
A
A
e
SEE VIEW B
b
c
WITH PLATING
BASE METAL
SECTION A-A
S
Y
M
B
O
L
MIN.
MAX.
A
2.19
2.38
θ
L
SEATING PLANE
L1
VIEW B
A1
L2
GAUGE PLANE
Note: 1. Refer to JEDEC TO-252AA and AB.
2. Dimension "E" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side .
3. Dimension "D" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
TO252-3
MILLIMETERS
A1
0.00
0.13
b
0.64
0.89
b3
4.95
5.46
c
0.46
0.61
0.89
c2
0.46
D
5.33
6.22
D1
4.60
6.00
E
6.35
6.73
E1
3.90
5.46
e
2.28 BSC
H
9.40
L
1.40
10.41
1.78
L1
2.67 REF
L2
0.51 BSC
L3
0.89
2.03
L4
--
1.02
θ
0°
8°
8
AIC1084
TO263-3
A
c2
E1
THERMAL PAD
L2
H
D
D1
L1
E
A
b2
A
e
SEE VIEW B
S
Y
M
B
O
L
b
c
WITH PLATING
BASE METAL
SECTION A-A
θ
L
VIEW B
SEATING PLANE
A1
L3
GAUGE PLANE
Note: 1. Refer to JEDEC TO-263AB.
2. Dimension "E" does not include mold flash, protrusions
or gate burrs. Mold flash, protrusion or gate burrs shall not
exceed 6 mil per side .
3. Dimension "D" does not include inter-lead flash or protrusions.
4. Controlling dimension is millimeter, converted inch
dimensions are not necessarily exact.
TO263-3
MILLIMETERS
MIN.
MAX.
A
4.06
4.83
A1
0.00
0.25
b
0.51
0.99
b2
1.14
1.78
c
0.38
0.74
c2
1.14
1.65
D
8.38
9.65
D1
6.86
--
E
9.65
10.67
E1
6.23
--
e
2.54 BSC
H
14.61
15.88
L
1.78
2.79
L1
--
1.68
L2
--
θ
1.78
0.25 BSC
L3
0°
8°
Note:
Information provided by AIC is believed to be accurate and reliable. However, we cannot assume responsibility for use of any circuitry other than
circuitry entirely embodied in an AIC product; nor for any infringement of patents or other rights of third parties that may result from its use. We
reserve the right to change the circuitry and specifications without notice.
Life Support Policy: AIC does not authorize any AIC product for use in life support devices and/or systems. Life support devices or systems are
devices or systems which, (I) are intended for surgical implant into the body or (ii) support or sustain life, and whose failure to perform, when
properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury to the
user.
9
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