AIC AIC1084

AIC1084
5A Low Dropout Positive Adjustable Regulator
n FEATURES
n DESCRIPTION
l
Dropout Voltage 1.3V at 5A Output Current.
The AIC1084 is a low dropout three terminal
l
Fast Transient Response.
regulator with 5A output current capability. The
l
Extremely Tight Line and Load Regulation.
output voltage is adjustable with the use of a
l
Current Limiting and Thermal Protection.
resistor divider or fixed 3.3V. Dropout voltage is
l
Adjustable Output Voltage or Fixed 1.5V, 1.8V,
guaranteed to be at maximum of 1.4V with the
3.3V.
maximum output current. Its low dropout voltage
Standard 3-Pin Power Packages.
and fast transient response make it ideal for low
l
voltage microprocessor applications. Current limit
n APPLICATIONS
and thermal protection provide protection against
l
Mother Board I/O Power Supplies.
any overload condition that would create excessive
l
Microprocessor Power Supplies.
junction temperatures.
l
High Current Regulator.
l
Post Regulator for Switching Supply.
n TYPICAL APPLICATION CIRCUIT
3
VIN
5V
AIC1084
2
1 ADJ
C1 +
10µF
VOUT
3.3V
RF1
125Ω
1%
+
C2
RF2
10µF
205Ω
1%
VREF
VR E F=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
GND
Fixed Voltage Regulator
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1084-03
TEL: 886-3-5772500
Sep 21, 01
FAX: 886-3-5772510
www.analog.com.tw
1
AIC1084
n ORDERING INFORMATION
AIC1084-XXCX
ORDER NUMBER
PACKAGING TYPE
E: TO-252
M: TO-263
T: TO-220
MA: TO-263AA
AIC1084CE
(TO-252)
OUTPUT VOLTAGE
DEFAULT: ADJ.
15: 1.5V
18: 1.8V
33: 3.3V
AIC1084CM
(TO-263)
AIC1084CMA
(TO-263AA)
AIC1084CT
(TO-220)
PIN CONFIGURATION
FRONT VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
1
2
1
2
3
FRONT VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
3
FRONT VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
1
2
3
FRONT VIEW
1: ADJ (GND)
2: VOUT (TAB)
3: VIN
1
2
3
n 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, TO263AA, TO-220.....… … … ....
Thermal Resistance Junction to Ambient
6°C /W
TO-252
… … … … … … … … … … ..… 100°C/W
(Assume no ambient airflow, no heatsink) TO-263
… .....… … .....… … … … … ... 60°C /W
TO-263AA
TO-220
Lead Temperature (Soldering) 10 sec.
… ..… … ..… … .....… … ... 60°C /W
… ....… … ....… … … … … … .. 50°C /W
.....................… … … ..… ............… … ..… .......260°C
2
AIC1084
n TEST CIRCUIT
Refer to TYPICAL APPLICATION CIRCUIT.
n
ELECTRICAL CHARACTERISTICS
(V IN =5V, TJ=25°C, IO=10mA, Unless otherwise
specified)
PARAMETER
Reference Voltage
Output Voltage
Line Regulation
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
1.238
1.25
1.262
V
AIC1084-15 VIN =5V
1.48
1.50
1.52
AIC1084-18 VIN =5V
1.78
1.80
1.82
AIC1084-33 VIN =5V
3.26
3.30
3.34
0.015
0.2
%
0.6
%
1.4
V
AIC1084 (ADJ)
TJ =25°C
V
ADJ : 2.65V ≤ VIN ≤7V
VOUT=1.25V
Fix : VOUT+1.4V≤ VIN ≤7V
TJ =25°C
Load Regulation
10mA < IO < 5A
TJ =25°C
∆VOUT, ∆VREF =1%
Dropout Voltage
10mA ≤ IO ≤ 5A
1.3
0°C ≤TJ ≤125°C
Current Limit
0°C ≤ TJ ≤125°C
Adjusted Pin Current
2.65V ≤ VIN ≤ 7V
Adjusted Pin Current Change
2.65V ≤ VIN ≤ 7V
(∆IADJ)
0°C ≤TJ ≤125°C
Temperature Stability
5
IO=0.5A
6
A
55
120
µA
0.2
5
µA
0°C ≤TJ ≤125°C
0.5
Minimum Load Current
0°C ≤TJ ≤125°C
5
RMS Output Noise (% of VOUT)
10Hz ≤ f ≤ 10KHz
%
10
mA
0.003
%
72
dB
120Hz input ripple
Ripple Rejection Ratio
COUT=25µF
60
(V IN -V OUT)=3V
3
AIC1084
n BLOCK DIAGRAM
VIN
+
GM
V REF +
1.25V
Current Amp.
-
Thermal
Limit
Current
Limit
55µA
VOUT
For fixed voltage
device
GND
ADJ
n PIN DESCRIPTIONS
ADJ PIN
-
Providing VREF=1.25V (typ.) for adjustable VOUT. VREF=VOUT-V ADJ and IADJ=55µA (typ.)
GND PIN- Power ground.
VOUT PIN -
Adjustable output voltage.
VIN PIN
Power Input.
-
n TYPICAL
PERFORMANCE CHARACTERISTICS
Output Voltage
(mV, AC)
Output Voltage
(V, AC)
0.4
0.2
50
0
-50
-0.2
VIN =5.0V
CIN=1µF(Tantalum)
COUT =10µF(Tantalum)
VOUT=3.3V
-100
Input Voltage (V)
-0.4
Load Current
0
2.5A
0.1A
0
20
Fig. 1
40
60
80
Time (µS)
Load Transient Response
100
CIN=1µF (Tantalum)
COUT =10µF (Tantalum)
VOUT=3.3V
7.0
6.0
0
40
Fig. 2
80
120
160
200
Time (µS)
Line Transient Response
4
AIC1084
n TYPICAL
PERFORMANCE CHARACTERISTICS
(Continued)
Minimum Operating Current (mA)
Minimum differential Voltage (V)
1.35
1.30
1.25
1.20
1.15
1.10
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1.05
0
1
2
3
4
0
5
2
3
4
5
Differential Voltage (V)
Fig. 4 Minimum Operating Current
Output Current (A)
Dropout Voltage (V OUT=3.3V)
Fig. 3
5
8
7
Short Circuit Current (A)
Minimum Operating Current (mA)
1
4
3
2
1
6
5
4
3
2
1
0
1
2
3
4
5
6
7
8
0
9
Differential Voltage (V)
Fig. 5
1
2
3
4
5
6
7
VIN-V OUT (V)
Minimum Operating Current
Fig. 6 AIC1084 (ADJ.) Short Circuit Current
Ripple Rejection Ratio (dB)
-20
C OUT=3.3µF
-30
-40
COUT=10µF
-50
-60
C OUT=25µF
-70
-80
1
10
2
10
3
10
4
10
5
10
6
10
7
10
Frequency (Hz)
Fig. 7
AIC1084 (ADJ.) Ripple Rejection
5
AIC1084
n PHYSICAL DIMENSIONS
TO-220 (unit: mm)
A
E
F
Φ3.81±0.27
l
D
SYMBOL
MIN
MAX
A
3.56
4.82
D
14.23
16.51
E
9.66
10.66
e
2.29
2.79
e1
0.50
1.15
e2
-
1.10
F
0.51
1.39
J1
2.04
2.92
L
12.70
14.73
L
e1
J1
e
e2
6