AIC1721/1721D
150mA/300mA Low Dropout Linear Regulator
with 1% Output Accuracy
FEATURES
Low Dropout Voltage of 130mV at 100mA Output
Current (5V Output Version).
Guaranteed 150mA/300mA Output Current.
Internal 1.3Ω P-MOSFET Draws no Base Current.
Low Ground Current: 55µA.
1% Accuracy Output Voltage of 3.3V/5V.
Input Voltage Range up to 12V (5V Output
Version).
Extremely Tight Load and Line Regulation.
Fast Transient Response.
Current Limiting and Thermal Protection.
DESCRIPTION
AIC1721/1721D is a 150mA/300mA low dropout
linear regulator. 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 at 55
µ
A, when loading ranges
from zero to maximum. When output current is
100mA, in comparison with bipolar counterpart,
dropout
voltage
of
AIC1721/1721D
is
substantially lower (130mV for the AIC1721-
50/1721D-50, and 180mV for the AIC1721-
33/1721D-33). Built-in output current limiting and
thermal limiting provide maximal protection to the
AIC1721/1721D against fault conditions.
The AIC1721 and AIC1721D are available in
popular SOT-89 and TO-92 packages.
APPLICATIONS
LAN Cards.
Wireless Communication Systems.
Battery Powered Systems.
TYPICAL APPLICATION CIRCUIT
VOUT
VIN
V
IN
AIC1721/
AIC1721D
V
OUT
GND
+
1µF
C
IN
+
10µF
C
OUT
(Note1)
Low Dropout Linear 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-1721P-04 042406
1
AIC1721/1721D
ORDERING INFORMATION
AIC1721X-XXXXXX
PACKING TYPE
TR: TAPE & REEL
BG: BAG
PACKAGE TYPE
X: SOT-89
Z: TO-92
C: Commercial
P: Lead Free Commercial
OUTPUT VOLTAGE
DEFAULT: 3.3V
50: 5.0V
OUTPUT CURRENT
DEFAULT: 150mA
D: 300mA
Example: AIC1721CXTR
150mA, 3.3V Version, in SOT-89
Package & Tape & Reel Packing Type
AIC1721PXTR
150mA, 3.3V Version, in SOT-89 Lead
Free Package & Tape & Reel Packing
Type
PIN CONFIGURATION
SOT-89
FRONT VIEW
1. VOUT
2. GND
3. VIN
TO-92
FRONT VIEW
1. VOUT
2. GND
3.
VIN
1
2
3
1
2
3
SOT89 Marking
Part No.
AIC1721
AIC1721-50
CX
AF33
AF50
PX
AF33P
AF50P
Part No.
AIC1721D
AIC1721D-50
CX
AG33
AG50
PX
AG33P
AG50P
2
AIC1721/1721D
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage
Operating Junction Temperature Range
Maximum Junction Temperature
Storage Temperature Range
Lead Temperature (Soldering) 10 sec.
Thermal Resistance Junction to Case, Rθ
JC
SOT-89
TO-92
Thermal Resistance Junction to Ambient, Rθ
JA
SOT-89
(Assume no ambient airflow, no heatsink)
TO-92
-0.3~12V
-40°C~ 85°C
125°C
-65°C~150°C
260°C
30°C /W
120°C /W
160°C /W
150°C /W
Absolute Maximum Ratings are those values beyond which the life of a device may be impaired.
TEST CIRCUIT
Refer to the TYPICAL APPLICATION CIRCUIT
3
AIC1721/1721D
ELECTRICAL CHARACTERISTICS
otherwise specified.)(Note2)
PARAMETER
Output Voltage
Output Voltage
Temperature
Coefficiency
Line Regulation
(T
A
=25°C, C
IN
=1µF, C
OUT
=10µF, unless
TEST CONDITIONS
AIC1721/1721D-50 V
IN
=5.5~12V, I
OUT
=0mA
AIC1721/1721D
V
IN
=3.6~12V, I
OUT
=0mA
(Note 3)
I
OUT
=1mA
AIC1721/1721D-50
V
IN
=5.5~12V
AIC1721/1721D
V
IN
=3.6~12V
AIC1721-50
V
IN
=7V, I
OUT
=0.1~150mA
V
IN
=7V, I
OUT
=0.1~300mA
AIC1721D-50
V
IN
=5V, I
OUT
=0.1~150mA
AIC1721
V
IN
=5V, I
OUT
=0.1~300mA
AIC1721D
AIC1721-50
V
IN
=7V, V
OUT
=0V
V
IN
=5V, V
OUT
=0V
AIC1721
AIC1721D-50
V
IN
=7V, V
OUT
=0V
V
IN
=5V, V
OUT
=0V
AIC1721D
AIC1721-50
I
OUT
=150mA
I
OUT
=150mA
AIC1721
AIC1721D-50
I
OUT
=300mA
AIC1721D
I
OUT
=300mA
I
OUT
=0.1mA~I
MAX
V
IN
=5.5~12V
AIC1721/1721D-50
V
IN
=4~12V
AIC1721/1721D
MIN.
4.950
3.267
TYP.
5.0
3.3
50
MAX.
5.050
3.333
150
UNIT
V
PPM/°C
Load Regulation
(Note 4)
Current Limit
(Note 5)
300
300
300
300
Dropout Voltage
(Note 6)
3
3
7
7
7
7
440
440
440
440
200
270
400
540
55
55
10
10
15
25
15
25
mV
mV
mA
300
370
500
640
80
80
mV
Ground Current
µA
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: Guaranteed by design.
Note 4: Regulation is measured at a constant junction temperature, which results from the use of pulse
testing.
Note 5: Current limit is measured by pulse testing.
Note 6: Dropout voltage is defined as voltage differential at which the output voltage drops 100mV with an
initial 1V differential between input and output.
4
AIC1721/1721D
TYPICAL PERFORMANCE CHARACTERISTICS
104
60
Normalized Output Voltage (%)
50
Ground Current (
µ
A)
-40
0
0
50
100
125
103
40
100
30
20
98
10
96
0
0
2
4
6
8
10
12
Temperature (°C)
Fig. 1
Output Voltage vs. Temperature
Fig. 2
Input Voltage (V)
Ground Current vs. Input Voltage
60
600
58
500
V
OUT
=3.3V
Ground Current (µA)
Dropout Voltage (mV)
56
I
L
=300mA
I
L
=150mA
400
300
54
200
52
I
L
=0.1mA
V
OUT
=5.0V
100
50
-50
-25
0
25
50
75
100
125
0
0
50
100
150
2 00
25 0
300
Temperature (°C)
Fig. 3 Ground Current vs. Temperature
600
500
Load Current (mA)
Fig. 4
Dropout Voltage vs. Load Current
500
V
OUT
=5V
I
L
=300mA
AIC1721D
Short Circuit Current (mA)
400
Dropout Voltage(mV)
400
300
I
L
=150mA
200
300
100
AIC1721
I
L
=0.1mA
0
-50
-25
0
25
50
75
100
125
200
-50
-25
0
25
50
75
100
125
Temperature(°C)
Fig. 5 Dropout Voltage vs Temperature
Temperature (°C)
Fig. 6
Short Circuit Current vs. Temperature
5
