AIC1721/1721D
150mA/300mA Low Dropout Linear Regulator
with 1% Output Accuracy
Analog Integrations Corporation
4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan
DS-1721-01 032502
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
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FEATURES
l
Low Dropout Voltage of 130mV at 100mA Output
Current (5V Output Version).
l
Guaranteed 150mA/300mA Output Current.
l
Internal 1.3
P-MOSFET Draws no Base Current.
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Low Ground Current: 55
A.
l
1% Accuracy Output Voltage of 3.3V/5V.
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Input Voltage Range up to 12V (5V Output
Version).
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Extremely Tight Load and Line Regulation.
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Fast Transient Response.
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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
l
Voltage Regulator for LAN Cards.
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Wireless Communication Systems.
l
Battery Powered Systems.
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DESCRIPTION
The AIC1721/1721D is the enhanced CMOS
version of the LP2950. The superior
characteristics of the AIC1721/1721D include
zero-base current loss, very low dropout voltage,
and 1% 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
significantly lower than its bipolar counterpart:
130mV for the AIC1721-50/1721D-50, and
180mV for the AIC1721/ 1721D. Output current
limiting and thermal protections are built to
protect AIC1721/1721D against fault condition.
AIC1721 and AIC1721D come with SOT-89 and
TO-92 packages of 3-pins, whose definitions are
the same as those of LP2950 and standard 78XX.
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TYPICAL APPLICATION CIRCUIT
+
+
AIC1721/
AIC1721D
10
F
C
OUT
V
OUT
VOUT
GND
VIN
1
F
C
IN
V
IN
Low Dropout Linear Regulator
AIC1721/1721D
2
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ORDERING INFORMATION
PACKING TYPE
TR: TAPE & REEL
BG: BAG
PACKAGE TYPE
X: SOT-89
Z: TO-92
OUTPUT VOLTAGE
DEFAULT: 3.3V
50: 5.0V
OUTPUT CURRENT
DEFAULT: 150mA
D: 300mA
AIC1721X-XXCXXX
Example: AIC1721CXTR
150mA, 3.3V Version, in SOT-89
Package & Tape & Reel Packing Type
SOT-89
FRONT VIEW
1. VOUT
2. GND
3. VIN
1
2
3
1
2
3
PIN CONFIGURATION
TO-92
FRONT VIEW
1. GND
2. VIN
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. 80W
TO-92 Package .......... ... .... ............ 0.78W
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TEST CIRCUIT
Refer to the TYPICAL APPLICATION CIRCUIT
AIC1721/1721D
3
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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
Output Voltage
AIC1721/1721D-50
AIC1721/1721D
V
IN
=5.5~12V, I
OUT
=0mA
V
IN
=3.6~12V, I
OUT
=0mA
4.950
3.267
5.0
3.3
5.050
3.333
V
Output Voltage
Temperature
Coefficiency
(Note 1)
50
150
PPM/
C
Line Regulation
I
OUT
=1mA
AIC1721/1721D-50
AIC1721/1721D
V
IN
=5.5~12V
V
IN
=3.6~12V
3
3
10
10
mV
Load Regulation
(Note 2)
AIC1721-50
AIC1721D-50
AIC1721
AIC1721D
V
IN
=7V, I
OUT
=0.1~150mA
V
IN
=7V, I
OUT
=0.1~300mA
V
IN
=5V, I
OUT
=0.1~150mA
V
IN
=5V, I
OUT
=0.1~300mA
7
7
7
7
15
25
15
25
mV
Current Limit
(Note 3)
AIC1721-50
AIC1721
AIC1721D-50
AIC1721D
V
IN
=7V, V
OUT
=0V
V
IN
=5V, V
OUT
=0V
V
IN
=7V, V
OUT
=0V
V
IN
=5V, V
OUT
=0V
300
300
300
300
440
440
440
440
mA
Dropout Voltage
(Note 4)
AIC1721-50
AIC1721
AIC1721D-50
AIC1721D
I
OUT
=150mA
I
OUT
=150mA
I
OUT
=300mA
I
OUT
=300mA
200
270
400
540
300
370
500
640
mV
Ground Current
I
OUT
=0.1mA~I
MAX
AIC1721/1721D-50
AIC1721/1721D
V
IN
=5.5~12V
V
IN
=4~12V
55
55
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.
AIC1721/1721D
4
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TYPICAL PERFORMANCE CHARACTERISTICS
Fig. 1 Output Voltage vs. Temperature
Normalized Output
Voltage (%)
Temperature (
C)
0
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
1 00
150
2 00
2 50
3 00
0
100
200
300
400
500
V
OUT
=5.0V & 5.2V
V
OUT
=3.3V, 3.5V, 3.7V & 3.8V
Temperature(
C)
Fig. 5 Dropout Voltage vs Temperature
Dropout
Voltage(mV)
0
25
50
75
100
125
-25
-50
0
100
200
300
400
500
600
I
L
=0.1mA
V
OUT
=5V
I
L
=150mA
I
L
=300mA
Temperature (
C)
Fig. 6 Short Circuit Current vs. Temperature
Short Circuit Current (
mA)
0
25
50
75
100
125
-25
-50
200
300
400
500
AIC1721D
AIC1721
AIC1721/1721D
5
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TYPICAL PERFORMANCE CHARACTERISTICS
(Continued)
Fig. 7 Line Transient Response
Time (mS)
Input Voltage
(V)
Output Voltage
(
mV, AC)
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1.0
100
50
0
-50
8
6
C
OUT
=1
F
I
L
=1mA
V
OUT
=5V
Fig. 8 Load Transient Response
Time (mS)
Load Current
(
mA)
Output Voltage
(
mV, AC)
150
0.1
100
0
-100
-200
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
C
OUT
=1
F
V
OUT
=5V
Fig. 9 Load Transient Response
Time (mS)
Load Current
(
mA)
Output Voltage
(
mA, AC)
0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
20
0
-20
150
0.1
C
OUT
=10
F
V
OUT
=5V
-40
-60
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BLOCK DIAGRAM
V
REF
1.235V
GND
VOUT
VIN
ERROR
AMP
+
-
THERMAL
LIMITING
-
+
CURRENT
LIMITING
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