AIC1734
300mA Low Dropout Linear Regulator
Analog Integrations Corporation Si-Soft Research Center DS-1734P-04 010405
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
FEATURES
Low Dropout Voltage of 470mV at 300mA Out-
put Current (3.0V Output Version).
Guaranteed 300mA Output Current.
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.
Only needs 1µF Output Capacitor for Stability.
Current and Thermal Limiting.
APPLICATIONS
CD-ROM Drivers.
LAN Cards.
Microprocessor.
RAM Module.
Wireless Communication Systems.
Battery Powered Systems.
DESCRIPTION
The AIC1734 is a 3-pin low dropout linear
regulator. The superior characteristics of the
AIC1734 include zero base current loss, very
low dropout voltage, and 2% accuracy output
voltage. Typical ground current remains ap-
proximately 55 µA, for loading ranging from
zero to maximum. Dropout voltage at 300mA
output current is exceptionally low. Built-in
output current limiting and thermal limiting
provide maximal protection to the AIC1734
against fault conditions.
The AIC1734 is available in popular SOT-23,
SOT-89 and TO-92 packages.
TYPICAL APPLICATION CIRCUIT
+
+
AIC1734
1µF
COUT
VOUT
VOUT
GND
VIN
1µF
CIN
VIN
Low Dropout Linear Regulator
AIC1734
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
IC1734-XXXXX XX
Example: AIC1734-18CXATR
1.8V Version, in SOT-89 Package &
Tape & Reel Packing Type
AIC1734-18PXATR
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
AIC1734-18XU CD18 CD18P AIC1734-35XU CD35 CD35P
AIC1734-20XU CD20 CD20P AIC1734-37XU CD37 CD37P
AIC1734-25XU CD25 CD25P AIC1734-38XU CD38 CD38P
AIC1734-27XU CD27 CD27P AIC1734-50XU CD50 CD50P
AIC1734-30XU CD30 CD30P AIC1734-52XU CD52 CD52P
AIC1734-33XU CD33 CD33P
2
AIC1734
SOT-89 MARKING
Part No. CXA PXA Part No. CXT PXT
AIC1734-18XXA CA18 CA18P AIC1734-18XXT CB18 CB18P
AIC1734-20XXA CA20 CA20P AIC1734-20XXT CB20 CB20P
AIC1734-25XXA CA25 CA25P AIC1734-25XXT CB25 CB25P
AIC1734-27XXA CA27 CA27P AIC1734-27XXT CB27 CB27P
AIC1734-30XXA CA30 CA30P AIC1734-30XXT CB30 CB30P
AIC1734-33XXA CA33 CA33P AIC1734-33XXT CB33 CB33P
AIC1734-35XXA CA35 CA35P AIC1734-35XXT CB35 CB35P
AIC1734-37XXA CA37 CA37P AIC1734-37XXT CB37 CB37P
AIC1734-38XXA CA38 CA38P AIC1734-38XXT CB38 CB38P
AIC1734-50XXA CA50 CA50P AIC1734-50XXT CB50 CB50P
AIC1734-52XXA CA52 CA52P AIC1734-52XXT CB52 CB52P
ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage -0.3 ~12V
Operating Temperature Range -40°C~ 85°C
Storage Temperature Range -65°C~150°C
Maximum Junction Temperature 125°C
Lead Temperature (Soldering) 10 sec. 260°C
Thermal Resistance Junction to Ambient SOT-89 Package 160°C/W
(Assume no Ambient Airflow, no Heatsink) TO-92 Package 150°C/W
SOT-23 Package 180°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
AIC1734
ELECTRICAL CHARACTERISTICS (TA=25°C, CIN=1µF, COUT=1µF, unless oth-
erwise specified.)
PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT
No Load
Output Voltage
AIC1734-52
AIC1734-50
AIC1734-38
AIC1734-37
AIC1734-35
AIC1734-33
AIC1734-30
AIC1734-27
AIC1734-25
AIC1734-20
AIC1734-18
VIN=5.5~12V
VIN=5.5~12V
VIN=4.1~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
5.100
4.900
3.725
3.625
3.430
3.235
2.940
2.646
2.450
1.960
1.764
5.200
5.000
3.800
3.700
3.500
3.300
3.000
2.700
2.500
2.000
1.800
5.300
5.100
3.875
3.775
3.570
3.365
3.060
2.754
2.550
2.040
1.836
V
Output Voltage Tem-
perature Coefficiency (Note 1) 50 PPM/°C
Line Regulation
IL=1mA,
1.4V≤VOUT≤3.2V
3.3V≤VOUT≤5.2V
VIN=4V~12V
VIN=5.5V~12V
3
3
10
10
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=5~12V
VIN=7~12V
55
55
80
80
µA
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.
Note5: Specifications are guaranteed by Statistical Quality Controls (SQC), with no production test proved,
when operating temperature ranges from -40°C to 85°C.
4
AIC1734
TYPICAL PERFORMANCE CHARACTERISTICS
5.00
5.05
5.10
5.15
5.20
5.25
5.30
5.35
5.40
Fig. 1 VOUT vs. Temperature
V OUT (V)
Temperature (°C)
-50 -30 -10 10 30 50 70 90
A
IC1734-52
Fig. 2 VOUT vs. Temperature
V OUT (V)
-50 -30 -10 10 30 50 70 90
3.10
3.15
3.20
3.25
3.30
3.35
3.40
3.45
3.50
Temperature (°C)
A
IC1734-33
Fig. 3 Ground Current vs. Temperature
-40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90
38
40
42
44
46
48
50
ILOAD= 0mA
ILOAD=100mA
ILOAD=300mA
Ground Current (µA)
Temperature (°C)
A
IC1734-52
Fig. 4 Ground Current vs. Temperature
Ground Current (µA)
Temperature (°C)
-40 -30 -20 -10 010 20 30 40 50 60 70 80 90
38
40
42
44
46
48
ILOAD= 0mA
ILOAD=100mA
ILOAD=300mA
AIC1734-33
Fig. 5 Ground Current vs. VIN
Ground Current (µA)
VIN (V)
0 1 2 3 4 5 6 7 8 9 10 11 12
0
10
20
30
40
50
60
A
IC1734-52
Fig. 6 Ground Current vs. VIN
Ground Current (µA)
VIN (V)
0 1 2 3 4 5 6 7 8 9 10 11 12
0
10
20
30
40
50
60
A
IC1734-33
5
AIC1734
TYPICAL PERFORMANCE CHARACTERISTIC (Continued)
Fig. 7 VDROP vs. ILOAD
VDROP (mV)
ILOAD (mA)
0 50 100 150 200 250 300 350 400
0
50
100
150
200
250
300
350
400
450
500
T=-40°C
T= 20°C
T= 50°C
T= 80°C
A
IC1734-52
Fig. 8 VDROP vs. ILOAD
VDROP (mV)
ILOAD (mA)
050 100 150 200 250 300 350 400
0
100
200
300
400
500
600
T= 20°C
T=-40°C
T= 50°C
T= 80°C
A
IC1734-33
Fig. 9 Current Limit vs. Temperature
-40 -20 0 20 40 60 80
400
410
420
430
440
450
460
470
480
490
500
VIN = 7V
VIN = 8V
VIN = 6V
VIN = 5V
Crrent Limit (mA)
Temperature (°C)
A
IC1734
6
AIC1734
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
AIC1734
PHYSICAL DIMENSIONS (unit: mm)
SOT-23
0°
0.90
0.30
1.50
2.60
2.80
0.08
0.30
0.05
e
θ
L1
L
e1
c
E
E1
D
b
A2
A1
0.95 BSC
8°
0.60
1.90 BSC
0.60 REF
1.30
1.70
3.00
3.00
0.22
0.50
0.15
0.95
MIN.
S
Y
M
B
O
L
A 1.45
MAX.
SOT-23
MILLIMETERS
c
A
A2
b
WITH PLATING
0.25
A1
SECTION A-A
BASE METAL
e1
e
D
E
AA
E1
SEE VIEW B
VIEW B
θ
L1
L
SEATING PLANE
GAUGE PLANE
SOT-89
A
C
e1
e
D
D1
H
EL
0.36
3.94
2.29
1.50
4.40
0.35
0.44
e1
H
D
E
e
D1
C
B1
B
3.00 BSC
4.25
0.48
2.60
1.83
4.60
0.44
0.56
1.50 BSC
1.40
MIN.
S
Y
M
B
O
L
A1.60
MAX.
SOT-89
MILLIMETERS
0.89
L1.20
BB1
8
AIC1734
9
MILLIMETERS
TO-92
MAX.
5.33A
S
Y
M
B
O
LMIN.
4.32
0.47
4.19
2.66
1.39
5.20
2.66
b
D
E
e1
L
j
e
S
0.36
3.18
2.42
1.15
3.43
12.70
4.45
2.03
TO-92
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.
