AIC1722
300mA Low Dropout Linear Regulator
Analog Integrations Corporation
4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan
DS-1722-01 012102
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
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FEATURES
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Low Dropout Voltage of 130mV at 100mA
Output Current (5.2V Output Version).
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Guaranteed 300mA Output Current.
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Internal 1.3
P-MOSFET Draws no Base
Current.
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Low Ground Current: 55
A.
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2% Accuracy Output Voltage of 3.3V/ 3.5V/
3.7V/ 3.8V/ 5.0V/ 5.2V.
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Input Voltage Range up to 12V.
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Needs only 1
F output capacitor for Stability.
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Current Limiting and Thermal Protection.
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APPLICATIONS
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Voltage Regulator for CD-ROM Drivers.
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Voltage Regulator for LAN Cards.
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Voltage Regulator for Microprocessor.
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Wireless Communication Systems.
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Battery Powered Systems.
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DESCRIPTION
The AIC1722 is a 3-pin low dropout linear
regulator. The superior characteristics of the
AIC1722 include zero base current loss, very
low dropout voltage, and 2% accuracy output
voltage. Typical ground current remains
approximately 55
A, under the output condition
of from zero up to the maximum load. Dropout
voltage at 100mA output current is
exceptionally low: 130mV for the AIC1722-50
and AIC1722-52, 180mV for the AIC1722-33,
AIC1722-35, and AIC1722-37 AIC1722-38.
Current limiting and thermal protection are built
in to protect AIC1722 against fault conditions.
The AIC1722 comes in the popular 3-pin
SOT-89 and TO-92 packages.
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TYPICAL APPLICATION CIRCUIT
+
+
AIC1722
10
F
C
OUT
V
OUT
VOUT
GND
VIN
1
F
C
IN
V
IN
Low Dropout Linear Regulator
AIC1722
2
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ORDERING INFORMATION
PACKING TYPE
TR: TAPE & REEL
BG: BAG
PACKAGE TYPE
X: SOT-89
ZT: TO-92
ZL: TO-92
OUTPUT VOLTAGE
33: 3.3V
35: 3.5V
37: 3.7V
38: 3.8V
50: 5.0V
52: 5.2V
AIC1722-XXCXX XX
Example: AIC1722-33CXTR
3.3V Version, in SOT-89 Package
& Tape & Reel Packing Type
SOT-89
FRONT VIEW
1. VOUT
2. GND
3. VIN
4.
1
2
3
1
2
3
1
2
3
PIN CONFIGURATION
TO-92 (CZT)
FRONT VIEW
1. GND
2. VIN
3.
VOUT
TO-92 (CZL)
FRONT VIEW
1. VIN
2. GND
3.
VOUT
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ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage ...................................................... ... ... ... ..... ... .................. -0.3~12V
Operating Junction Temperature Range ........ ... ... ........... ... ... ... ................ -40
C~ 125
C
Storage Temperature Range ....................... ... ......................... ... ... .............. -65
C~150
C
Power Dissipation
SOT-89 Package ....... ...... ................. 0.5W
TO-92 Package ........ ... ... ... ............. 0.5W
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TEST CIRCUIT
Refer to the TYPICAL APPLICATION CIRCUIT
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ELECTRICAL CHARACTERISTICS
(T
J
=25
C, C
IN
=1 F, C
OUT
=10
F, unless
otherwise specified.)
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
AIC1722-52 V
IN
=5.5~12V, I
OUT
=0mA
5.100
5.2
5.300
AIC1722-50 V
IN
=5.5~12V, I
OUT
=0mA
4.900
5.0
5.100
AIC1722-38 V
IN
=4.1~12V, I
OUT
=0mA
3.725
3.8
3.875
AIC1722-37 V
IN
=4.0~12V, I
OUT
=0mA
3.625
3.7
3.775
AIC1722-35 V
IN
=4.0~12V, I
OUT
=0mA
3.430
3.5
3.570
Output Voltage
AIC1722-33 V
IN
=3.6~12V, I
OUT
=0mA
3.235
3.3
3.365
V
AIC1722
3
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ELECTRICAL CHARACTERISTICS
(Continued)
PARAMETER
TEST CONDITIONS
MIN.
TYP.
MAX.
UNIT
Output Voltage
Temperature
Coefficiency
(Note 1)
50
150
PPM/
C
Line Regulation
I
OUT
=1mA
AIC1722-52
AIC1722-50
AIC1722-38
AIC1722-37
AIC1722-35
AIC1722-33
V
IN
=5.5~12V
V
IN
=5.5~12V
V
IN
=4.1~12V
V
IN
=4.0~12V
V
IN
=4.0~12V
V
IN
=3.6~12V
3
3
3
3
3
3
10
10
10
10
10
10
mV
Load Regulation
(Note 2)
AIC1722-52
AIC1722-50
AIC1722-38
AIC1722-37
AIC1722-35
AIC1722-33
V
IN
=7V, I
OUT
=0.1~300mA
V
IN
=7V, I
OUT
=0.1~300mA
V
IN
=5V, I
OUT
=0.1~300mA
V
IN
=5V, I
OUT
=0.1~300mA
V
IN
=5V, I
OUT
=0.1~300mA
V
IN
=5V, I
OUT
=0.1~300mA
7
7
7
7
7
7
25
25
25
25
25
25
mV
Current Limit
(Note 3)
AIC1722-52
AIC1722-50
AIC1722-38
AIC1722-37
AIC1722-35
AIC1722-33
V
IN
=7V, V
OUT
=0V
V
IN
=7V, V
OUT
=0V
V
IN
=7V, V
OUT
=0V
V
IN
=5V, V
OUT
=0V
V
IN
=5V, V
OUT
=0V
V
IN
=5V, V
OUT
=0V
300
300
300
300
300
300
440
440
440
440
440
440
mA
Dropout Voltage
(Note 4)
AIC1722-52
AIC1722-50
AIC1722-38
AIC1722-37
AIC1722-35
AIC1722-33
I
OUT
=300mA
I
OUT
=300mA
I
OUT
=300mA
I
OUT
=300mA
I
OUT
=300mA
I
OUT
=300mA
400
400
540
540
540
540
500
500
640
640
640
640
mV
I
OUT
=0.1mA~I
MAX
Ground Current
AIC1722-52
AIC1722-50
AIC1722-38
AIC1722-37
AIC1722-35
AIC1722-33
V
IN
=5.5~12V
V
IN
=5.5~12V
V
IN
=4~12V
V
IN
=4~12V
V
IN
=4~12V
V
IN
=4~12V
55
55
55
55
55
55
80
80
80
80
80
80
A
Note 1:
Guaranteed by design.
Note 2:
Regulation is measured at constant junction temperature, using pulse testing with a low ON time.
Note 3:
Current limit is measured by pulsing a short time.
Note 4:
Dropout voltage is defined as the input to output differential at which the output voltage drops 100mV below
the value measured with a 1V differential.
AIC1722
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TYPICAL PERFORMANCE CHARACTERISTICS
Fig. 1 Output Voltage vs. Temperature
Normalized Output
Voltage (%)
Temperature (
C)
50
100
96
98
100
103
104
0
-40
125
Fig. 2 Ground Current vs. Input Voltage
G
round Current (
A)
Input Voltage (V)
0
10
20
30
40
50
60
0
2
4
6
8
10
12
Fig. 3 Ground Current vs. Temperature
Ground Current (
A)
Temperature (
C)
125
0
25
50
75
100
-25
-50
50
52
54
56
58
60
I
L
=300mA
I
L
=150mA
I
L
=0.1mA
Fig. 4 Dropout Voltage vs. Load Current
Dropout Voltage (mV)
Load Current (mA)
600
0
50
100
150
200
250
300
0
100
200
300
400
500
V
OUT
=5.0V & 5.2V
V
OUT
=3.3V, 3.5V, 3.7V & 3.8V
Fig. 5 Line Transient Response
Time (mS)
Output Voltage
(
mV, AC)
0
100
8
6
C
OUT
=1
F
I
L
=1mA
V
OUT
=5.2V
Input Voltage
(V)
50
0
-50
0.5
0.1
0.4
0.2
0.3
1.0
0.6
0.9
0.7
0.8
Fig. 6 Load transient Response
Time (mS)
Output Voltage
(
mV, AC)
0
-40
150
0.1
Load Current
(
mA)
20
0
-20
2.5
0.5
2.0
1.0
1.5
5.0
3.0
4.5
3.5
4.0
-60
C
OUT
=1
F
V
OUT
=5.2V
AIC1722
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TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
Fig. 7 Load Transient Response
Time (mS)
0
0.5
0
-100
0.1
C
OUT
=1
F
V
OUT
=5.2V
-200
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
100
150
Load Current
(
mA)
Current Voltage
(
mV, AC)
O
utput Current, I
OUT
(
mA)
Input Voltage V
IN
(V)
Fig. 8 Recommended Max. Output Current vs.
Input Voltage
4
5
6
7
8
9
10
11
12
0
100
200
300
400
3.3V
3.5V
3.7V
3.8V
5V
5.2V
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BLOCK DIAGRAM
V
REF
1.235V
GND
VOUT
VIN
ERROR
AMP
+
-
THERMAL
LIMITING
-
+
CURRENT
LIMITING
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PIN DESCRIPTIONS
VOUT PIN - Output pin.
GND PIN - Power GND.
VIN PIN
- Power Supply Input.
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APPLICATION INFORMATIONS
A 1
F (or greater) capacitor is required between
the AIC1722 output and ground for stability.
Without this capacitor the part will oscillate. Even
though most types of capacitor may work, the
equivalent series resistance (ESR) should be held
to 5
or less if Aluminum electrolytic type is used.
Many Aluminum electrolytics have electrolytes
that freeze at about -30
C, so solid tantalums are
recommended for operation below -25
C. The
value of this capacitor may be increased without
limit.
A 0.1
F capacitor (or greater) should be placed
from the AIC1722 input to ground if the lead
inductance between the input and power source
exceeds 500nH (approximately 10 inches of trace).
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