AIC1722A
300mA Low Dropout Linear Regulator
FEATURES
Low Dropout Voltage of 470mV at 300mA Out-
put Current (3.0V Output Version).
Guaranteed 300mA Output Current.
Maximum Input Voltage is 8V
Low Ground Current at 55µA.
2% Accuracy Output Voltage of 1.8V/ 2.0V
/2.5V /2.7V/ 3.0V/ 3.3V/ 3.5V/ 3.7V/ 3.8V/ 5.0V/
5.2V.
Needs only 1µF for Stability.
Current and Thermal Limiting.
APPLICATIONS
Voltage Regulator for CD-ROM Drivers.
Voltage Regulator for LAN Cards.
Voltage Regulator for Microprocessor.
Wireless Communication Systems.
Battery Powered Systems.
DESCRIPTION
The AIC1722A is a 3-pin low dropout linear
regulator. The superior characteristics of the
AIC1722A include zero base current loss,
very low dropout voltage, and 2% accuracy
output voltage. Typical ground current
remains approximately 55µA, from no load to
maximum loading conditions. Dropout voltage
at 300mA output current is exceptionally low.
Output current limiting and thermal limiting are
built in to provide maximal protection to the
AIC1722A against fault conditions.
The AIC1722A comes in the popular 3-pin
SOT-89, TO-92 and SOT-23 packages.
TYPICAL APPLICATION CIRCUIT
+
+
AIC1722A
1µF
COUT
VOUT
VOUT
GND
VIN
1µF
CIN
VIN
Low Dropout Linear Regulator
(CIN and COUT are electrolytic capacitor)
Analog Integrations Corporation Si-Soft Research Center DS-1722AP-01 070204
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 1
AIC1722A
ORDERING INFORMATION
PIN CONFIGURATION
SOT-89 (CXT & PXT)
TOP VIEW
1: VOUT
2. GND
3. VIN
SOT-89 (CXA & PXA)
TOP VIEW
1: GND
2. VIN
3. VOUT
TO-92 (CZT & PZT)
TOP VIEW
1: GND
2. VIN
3. VOUT
TO-92 (CZL & PZL)
TOP VIEW
1: VIN
2. GND
3. VOUT
1
2
3
1 2 3
1 2 3
1
2
3
PACKING TYPE
TR: TAPE & REEL
BG: BAG
PACKAGE TYPE
U: SOT-23
XA: SOT-89
XT: SOT-89
ZT: TO-92
ZL: TO-92
C: Commercial
P: Lead Free Commercial
OUTPUT VOLTAGE
18: 1.8V
20: 2.0V
25: 2.5V
27: 2.7V
30: 3.0V
33: 3.3V
35: 3.5V
37: 3.7V
38: 3.8V
50: 5.0V
52: 5.2V
A
IC1722A-XXXXX XX
Example: AIC1722A-18CXATR
1.8V Version, in SOT-89 Package &
Tape & Reel Packing Type
AIC1722A-18PXATR
1.8V Version, in SOT-89 Lead Free
Package & Tape & Reel Packing Type
SOT-23 (CU & PU)
TOP VIEW
1: GND
2: VOUT
3: VIN
3
1 2
SOT-23 MARKING
Part No. CU PU Part No. CU PU
AIC1722A-18XU BN18 BN18P AIC1722A-35XU BN35 BN35P
AIC1722A-20XU BN20 BN20P AIC1722A-37XU BN37 BN37P
AIC1722A-25XU BN25 BN25P AIC1722A-38XU BN38 BN38P
AIC1722A-27XU BN27 BN27P AIC1722A-50XU BN50 BN50P
AIC1722A-30XU BN30 BN30P AIC1722A-52XU BN52 BN52P
AIC1722A-33XU BN33 BN33P
2
AIC1722A
SOT-89 MARKING
Part No. CXA PXA Part No. CXT PXT
AIC1722A-18XXA AL18 AL18P AIC1722A-18XXT BA18 BA18P
AIC1722A-20XXA AL20 AL20P AIC1722A-20XXT BA20 BA20P
AIC1722A-25XXA AL25 AL25P AIC1722A-25XXT BA25 BA25P
AIC1722A-27XXA AL27 AL27P AIC1722A-27XXT BA27 BA27P
AIC1722A-30XXA AL30 AL30P AIC1722A-30XXT BA30 BA30P
AIC1722A-33XXA AL33 AL33P AIC1722A-33XXT BA33 BA33P
AIC1722A-35XXA AL35 AL35P AIC1722A-35XXT BA35 BA35P
AIC1722A-37XXA AL37 AL37P AIC1722A-37XXT BA37 BA37P
AIC1722A-38XXA AL38 AL38P AIC1722A-38XXT BA38 BA38P
AIC1722A-50XXA AL50 AL50P AIC1722A-50XXT BA50 BA50P
AIC1722A-52XXA AL52 AL52P AIC1722A-52XXT BA52 BA52P
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage ...................................................…………..…….................. -0.3~8V
Operating Temperature Range …………….....………........…………................ -40°C~ 85°C
Junction Temperature ……………………………………………………………………... 125°C
Storage Temperature Range ....................……......................………............. -65°C~150°C
Lead Temperature (Soldering. 10sec) …………………………………………………… 260°C
Power Dissipation SOT-89 Package ....…...…................. 0.5W
TO-92 Package .....…………............. 0.5W
SOT-23 Package.....…………............. 0.5W
Absolute Maximum Rating are those value beyond which the life of a device may be impaired.
TEST CIRCUIT
Refer to the TYPICAL APPLICATION CIRCUIT
3
AIC1722A
ELECTRICAL CHARACTERISTICS (TA=25°C, CIN=1µF, COUT=1µF, unless oth-
erwise specified.) (Note 1)
PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT
No Load
Output Voltage
AIC1722A-52
AIC1722A-50
AIC1722A-38
AIC1722A-37
AIC1722A-35
AIC1722A-33
AIC1722A-30
AIC1722A-27
AIC1722A-25
AIC1722A-20
AIC1722A-18
VIN=8V
-2
+2 %
Line Regulation
IL=1mA,
1.4V≤VOUT≤3.2V
3.3V≤VOUT≤5.2V
VIN=4V~8V
VIN=5.5V~8V
3
3
10
15
mV
Load Regulation
(Note 2)
IL=0.1~300mA
1.4V≤VOUT≤3.9V
4.0V≤VOUT≤5.2V
VIN=5V
VIN=7V
7
15
20
40
mV
Current Limit
(Note 3) VIN=7V, VOUT=0V 300 mA
Dropout Voltage
(Note 4) IL=300mA
4.0V≤VOUT≤5.2V
3.0V≤VOUT≤3.9V
2.5V≤VOUT≤2.9V
2.0V≤VOUT≤2.4V
1.4V≤VOUT≤1.9V
400
470
570
800
1260
mV
Ground Current
IO=0.1mA~IMAX
1.4V≤VOUT≤3.9V
4.0V≤VOUT≤5.2V
VIN=5~8V
VIN=7~8V
55
55
80
80
µA
Note 1: 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 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.
4
AIC1722A
TYPICAL PERFORMANCE CHARACTERISTICS
-40 -20 0 20 40 60 80 100
2.46
2.47
2.48
2.49
2.50
2.51
2.52
A
IC1722A-25
VOUT vs. Temperature
V OUT (V)
Temperature (°C)
-40 -20 020 40 60 80 10
0
5.10
5.15
5.20
5.25
5.30
V OUT (V)
Temperature (°C)
VOUT vs. Temperature
A
IC1722A-52
Ground Current (uA)
-40 -20 0 20 40 60 80
45
50
55
60
65
70
A
IC1722A-25
Temperature (°C)
Ground Current vs. Temperature
ILOAD=100mA
ILOAD=300mA
ILOAD=0mA
Temperature (°C)
-40 -20 020 40 60 80
46
48
50
52
54
56
58
60
ILOAD=0mA
Ground Current vs. Temperature
Ground Current (uA)
A
IC1722A-52
ILOAD=100mA
ILOAD=300mA
0 1 2 3 4 5 6 7 8
0
10
20
30
40
50
60
A
IC1722A - 25
Ground Current (uA)
V IN (V)
Ground Current vs. VIN
0 1 2 3 4 5 6 7 8
0
10
20
30
40
50
60
70
A
IC1722A-52
Ground Current vs. VIN
Ground Current (uA)
V IN (V)
5
AIC1722A
TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
0 50 100 150 200 250 300
0
100
200
300
400
500
T=80°C
A
IC1722A-25
V DROP (mV)
I LOAD (mA)
VDROP vs. ILOAD
T=50°C
T=20°C
T=-40°C
A
IC1722A-52
T=80°C
T=50°C
T=20°C
T=-40°C
050 100 150 200 250 300
0
50
100
150
200
250
300
VDROP vs. ILOAD
V DROP (mV)
I LOAD (mA)
-40 -20 0 20 40 60 80
460
470
480
490
500
510
520
530
540
V IN=7V
V IN=6V
V IN=5V
A
IC1722A
Currnet Limit (mA)
Temperature (°C)
Current Limit vs. Temperature
V IN=4V
6
AIC1722A
BLOCK DIAGRAM
1.235V
Reference
GND
VOUT
VIN
ERROR
A
MP
+
-
THERMAL
SHUTDOWN
- +
CURRENT
LIMITING
PIN DESCRIPTIONS
VOUT PIN - Output pin.
GND PIN - Power GND.
VIN PIN - Power Supply Input.
7
AIC1722A
PHYSICAL DIMENSIONS (unit: mm)
SOT-23 (CU) (PU)
SYMBOL MIN MAX
A 0.95 1.45
A1 0.05 0.15
A2 0.90 1.30
b 0.30 0.50
c 0.08 0.22
D 2.80 3.00
E 2.60 3.00
E1 1.50 1.70
e 0.95 BSC
e1 1.90 BSC
L 0.30 0.60
L1 0.60 REF
E
D
E1
e1
e
A1
A
A
2
b
0.25
L1
L
c
θ 0˚ 8˚
SOT-89 (CXX) (PXX)
SYMBOL MIN MAX
A 1.40 1.60
B 0.44 0.56
B1 0.36 0.48
C 0.35 0.44
D 4.40 4.60
D1 1.50 1.83
E 2.29 2.60
e 1.50 BSC
e1 3.00 BSC
H 3.94 4.25
B1
e
H
e1
D
D1
A
C
L
E
B
L 0.89 1.20
8
AIC1722A
9
TO-92 (CZ)(PZ)
SYMBOL MIN MAX
A 4.32 5.33
b 0.36 0.47
D 4.45 5.20
E 3.18 4.19
e 2.42 2.66
e1 1.15 1.39
j 3.43 -
L 12.70 -
S 2.03 2.66
A
e1
e
L
D
S
E
j
b
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 par-
ties 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.