AIC1737
Low Output Voltage, 300mA Low Dropout Linear
Regulator
Analog Integrations Corporation 4F, 9 Industry E. 9th Rd, Science-Based Industrial Park, Hsinchu, Taiwan DS-1737-00 012102
TEL: 886-3-5772500 FAX: 886-3-5772510 www.analog.com.tw
1
n FEATURES
l Low Dropout Voltage of 180mV at 100mA
Output Current (3.0V Output Version).
l Guaranteed 300mA Output Current.
l Internal 1.3Ω P-MOSFET Draws no Base
Current.
l Low Ground Current at 55
µ
A.
l 2% Accuracy Output Voltage of 1.8V/ 2.0V/
2.5V/ 2.7V/ 3.0V.
l Input Voltage Range up to 12V.
l Needs only 1
µ
F for Stability.
l Current and Thermal Limiting.
n APPLICATIONS
l Voltage Regulator for CD-ROM Drivers.
l Voltage Regulator for LAN Cards.
l Voltage Regulator for Microprocessor.
l Wireless Communication Systems.
l Battery Powered Systems.
n DESCRIPTION
The AIC1737 is a 3-pin low dropout linear
regulator. The superior characteristics of the
AIC1737 include zero base current loss, very
low dropout voltage, and 2% accuracy output
voltage. Typical ground current remains
approximately 55
µ
A, from no load to
maximum loading conditions. Dropout voltage
is exceptionally low. Output current limiting
and thermal limiting are built in to provide
maximal protection to the AIC1737 against
fault conditions.
The AIC1737 comes in the popular 3-pin
SOT-89 packages.
n TYPICAL APPLICATION CIRCUIT
+
+
AIC1737
10µF
COUT
VOUT
VOUT
GND
VIN
VIN
1
µ
F
CIN
Low Dropout Linear Regulator
AIC1737
2
n ORDERING INFORMATION
PACKING TYPE
TR: TAPE & REEL
BG: BAG
PACKAGING TYPE
X:SOT89
OUTPUT VOLTAGE
18: 1.8V
20: 2.0V
25: 2.5V
27: 2.7V
30: 3.0V
AIC1737-XXCXXX PIN CONFIGURATION
SOT-89
FRONT VIEW
1. GND
2. IN
3. OUT 1 2 3
Example: AIC1737-18CXTR
à
1.8V Version, in SOT-89 Package &
Tape & Reel Packing Type
n ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage ...................................................…………..…….................. -0.3~12V
Operating Junction Temperature Range .....………........…………................ -40°C~ 85°C
Storage Temperature Range ....................……......................……….............. -65°C~150°C
Power Dissipation SOT-89 Package....…...…................. 0.5W
n TEST CIRCUIT
Refer to the TYPICAL APPLICATION CIRCUIT
n ELECTRICAL CHARACTERISTICS (Ta=25°C, CIN=1µF, COUT=10µF, unless
otherwise specified.)
PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT
Output Voltage No Load
AIC1737-30
AIC1737-27
AIC1737-25
AIC1737-20
AIC1737-18
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
2.940
2.646
2.550
1.960
1.764
3.000
2.700
2.500
2.000
1.800
3.060
2.754
2.550
2.040
1.836
V
Output Voltage
Temperature
Coefficiency
(Note 1) 50
150 PPM/°C
Line Regulation IL=1mA VIN=4.0~12V 3 10 mV
Load Regulation
(Note 2) V
IN
=5V, I
L
=0.1~300mA 7 25 mV
AIC1737
3
n ELECTRICAL CHARACTERISTICS (Continued)
PARAMETER TEST CONDITIONS MIN. TYP. MAX. UNIT
Current Limit
(Note 3) VIN=5V, VOUT=0V 320 440 mA
Dropout Voltage
(Note 4) AIC1737s
AIC1737-30
AIC1737-27
AIC1737-25
AIC1737-20
AIC1737-18
IL=0.1mA
IL=300mA
IL=300mA
IL=300mA
IL=300mA
IL=300mA
0.2
540
570
610
820
920
10
640
670
710
970
1070
mV
Ground Current IO=0.1mA~IMAX VIN=4~12V 55 80
µ
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.
n TYPICAL PERFORMANCE CHARACTERISTICS
Dropout Voltage (mV)
Load Current (
mA)
0 50 100 150 200 250 300
0
100
200
300
400
500
600
700
800
900
1000 Dropout Voltage vs Load Current
VOUT=2.7V
VOUT=3.0V
V
OUT
=2.0V
VOUT=1.8V
VOUT=2.5V
VOUT VOUT=3.0V
100mV/DIV
IOUT IOUT=0.1mA
IOUT=150mA
Time (0.5mS/DIV)
COUT=1µF
Load Transient Response
AIC1737
4
n TYPICAL PERFORMANCE CHARACTERISTICS (Continued)
VOUT VOUT=3.0V 20mV/DIV
IOUT
IOUT=0.1mA
IOUT=150mA
Time (0.5mS/DIV)
COUT=10µF
Load Transient Response
VIN VIN=4.0V
20mV/DIV
VOUT VOUT=3.0V
Time (1mS/DIV)
VIN=6V
Line Transient Response
COUT=1µF
IL=1mA
Dropout Voltage (mV)
Input Voltage (V)
Recommended max. Output Current vs. Input voltage
3 4 5 6 7 8 9 10 11 12
0
50
100
150
200
250
300
350
400
2.0V
2.5V
3.0V
2.7V
1.8V
n BLOCK DIAGRAM
1.235V
Reference
GND
VOUT
VIN
ERROR
AMP
-
THERMAL
SHUTDOWN
-
+
CURRENT
LIMITING
AIC1737
5
n PIN DESCRIPTION
VOUT PIN - Output pin.
GND PIN -Power GND.
VIN PIN -Power Supply Input.
n APPLICATION INFORMATIONS
A 1
µ
F (or greater) capacitor is required between
the AIC1737 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 5Ω 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 0.1µF capacitor (or greater) should be placed
from the AIC1737 input to ground if the lead
inductance between the input and power source
exceeds 500nH (approximately 10 inches of trace).
n PHYSICAL DIMENSIONS
l SOT-89 (unit: mm)
SYMBOL MIN MAX
A1.40 1.60
B0.36 0.48
C0.35 0.44
D4.40 4.60
D1 1.62 1.83
E2.29 2.60
e1.50 (TYP.)
e1 3.00 (TYP.)
H3.94 4.25
B
e
H
e1
D
D1
A
C
L
E
L0.89 1.20
SOT-89 MARKING
Part No. Marking
AIC1737-18 BM18
AIC1737-20 BM20
AIC1737-25 BM25
AIC1737-27 BM27
AIC1737-30 BM30
