AIC AIC1740-27CF Low output voltage, 500ma low dropout linear regulator Datasheet

AIC1740
Low Output Voltage, 500mA Low Dropout
Linear Regulator
n FEATURES
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n DESCRIPTION
Low Dropout Voltage of 900mV at 500mA
Output Current (3.0V Output Version).
Guaranteed 500mA Output Current.
Internal 1.5Ω P-MOSFET Draws no Base
Current.
Low Ground Current at 65µA.
2% Accuracy Output Voltage of 1.8V/ 2.0V/
2.5V/ 2.7V/ 3.0V.
Input Voltage Range up to 12V.
Needs only 4.7µF for Stability.
Current and Thermal Limiting.
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regulator. The superior characteristics of the
AIC1740 include zero base current loss, very
low dropout voltage, and 2% accuracy output
voltage.
Typical
ground
current
remains
approximately
65µA, 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
n APPLICATIONS
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The AIC1740 is a 3-pin low dropout linear
AIC1740 against fault conditions.
Voltage Regulator for CD-ROM Drivers.
Voltage Regulator for LAN Cards.
Voltage Regulator for Monitor Microprocessor.
Voltage Regulator for RAM Module.
Wireless Communication Systems.
Battery Powered Systems.
The AIC1740 comes in the popular SOT-223,
TO-251 and TO-252 packages.
n TYPICAL APPLICATION CIRCUIT
VIN
VI N
+
VOUT
AIC1740
1µF
CI N
GND
VOUT
+
10µ F
C OUT
Low Dropout Linear Regulator
Analog Integrations Corporation
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC
DS-1740-00 Aug 2, 00
TEL: 886-3-5772500
FAX: 886-3-5772510
www.analog.com.tw
2
AIC1740
n ORDERING INFORMATION
ORDER NUMBER
AIC1740-XCX
PACKAGING TYPE
E: TO-252
F: TO-251
Y: SOT-223
OUTPUT VOLTAGE
18: 1.8V
20: 2.0V
25: 2.5V
27: 2.7V
30: 3.0V
AIC1740-18CE
AIC1740-20CE
AIC1740-25CE
AIC1740-27CE
AIC1740-30CE
(TO-252)
PIN CONFIGURATION
FRONT VIEW
1: VOUT
2: GND
3: VIN
1 2 3
AIC1740-18CF
AIC1740-20CF
AIC1740-25CF
AIC1740-27CF
AIC1740-30CF
(TO-251)
FRONT VIEW
1: VOUT
2: GND
3: VIN
1 2 3
AIC1740-18CY
AIC1740-20CY
AIC1740-25CY
AIC1740-27CY
AIC1740-30CY
(SOT-223)
FRONT VIEW
1: VOUT
2: GND
3: VIN
1
2
3
n ABSOLUTE MAXIMUM RATINGS
Input Supply Voltage
...................................… … … … .................................... -0.3~12V
Operating Junction Temperature Range
Storage Temperature Range
.......… … … .............................. -40°C~ 85°C
.........................… … … … .......................... -65°C~150°C
Power Dissipation ....… … … … … … … … … … … … … ..… … … … … ..… … ............... 0.85W
Thermal Resistance θJC
TO-251, TO-252 Package ....… … .… … .......... 12.5°C/W
SOT-223 Package ....… … … … ..… … … .............15°C/W
n TEST CIRCUIT
Refer to the TYPICAL APPLICATION CIRCUIT
2
AIC1740
n
ELECTRICAL CHARACTERISTICS (Ta=25°C, CIN=1µF, COUT=10µF, unless otherwise
specified.)
PARAMETER
Output Voltage
Output Voltage
Temperature
Coefficiency
Line Regulation
TEST CONDITIONS
No Load
AIC1740-30
AIC1740-27
AIC1740-25
AIC1740-20
AIC1740-18
(Note 1)
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
VIN=4.0~12V
MIN.
TYP.
MAX.
2.940
2.646
2.450
1.960
1.764
3.0
2.7
2.5
2.0
1.8
50
3.060
2.754
2.550
2.040
1.836
UNIT
V
PPM/°C
IL=1mA, VIN=4.0~12V
3
10
Load Regulation
(Note 2)
Current Limit
(Note 3)
VIN=5V, IL=0.1~500mA
20
50
Dropout Voltage
(Note 4)
AIC1740s
AIC1740-30
AIC1740-27
AIC1740-25
AIC1740-20
AIC1740-18
VIN=5V, VOUT=0V
650
IL=0.1mA
IL=500mA
0.2
900
950
1000
1260
1370
mV
mV
mA
10
1050
1100
1150
1410
1520
mV
mV
Ground Current
IO=0.1mA~IMAX, VIN=4V~12V
65
90
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
below the value measured with a 1V differential.
3
AIC1740
n TYPICAL
PERFORMANCE CHARACTERISTICS
Load Transient Response
Dropout Voltage vs Load Current
COUT=1µF
1400
VOUT =1.8V
1300
Dropout Voltage (mV)
1200
V OUT =3.0V
VOUT
VOUT =2.0V
1100
200mV/DIV
1000
900
800
700
VOUT=2.5V
600
I OUT=250mA
V OUT=2.7V
500
400
I OUT
VOUT =3.0V
300
IOUT=0.1mA
200
100
0 0
50
100
150
200
250
300
350
400
450
500
Load Current (mA)
Time (0.5mS/DIV)
Load Transient Response
Line Transient Response
COUT =1µF
COUT =10µF
IL=1mA
VIN =6V
VOUT=3.0V
VOUT
VIN
VIN=4.0V
50mV/DIV
I OUT =250mA
I OUT
IOUT=0.1mA
VOUT
VOUT =3.0V
20mV/DIV
Time (1mS/DIV)
Time (0.25mS/DIV)
Recommended Max. Output Current vs Input Voltage
600
550
Output Current (mA)
500
450
3.0V
400
2.7V
1.8V
350
300
2.5V
2.0V
250
200
150
100
50
0
3
4
5
6
7
8
9
10
11
12
Input voltage (V)
4
AIC1740
n BLOCK DIAGRAM
VIN
VOUT
CURRENT
LIMITING
ERROR
AMP
+
-
+
THERMAL
SHUTDOWN
1.235V
Reference
GND
n PIN DESCRIPTION
VOUT PIN - Output pin.
GND PIN - Power GND.
VIN PIN - Power Supply Input.
n APPLICATION INFORMATIONS
A 4.7µF (or greater) capacitor is required between
recommended for operation below -25°C. The
the AIC1740 output and ground for stability.
value of this capacitor may be increased without
Without this capacitor the part will oscillate. Even
limit.
though most types of capacitor may work, the
equivalent series resistance (ESR) should be held
A 0.1µF capacitor (or greater) should be placed
to 5Ω or less if Aluminum electrolytic type is used.
from the AIC1740 input to ground if the lead
Many Aluminum electrolytics have electrolytes that
inductance between the input and power source
freeze at about -30°C, so solid tantalums are
exceeds 500nH (approximately 10 inches of trace).
5
AIC1740
n PHYSICAL DIMENSIONS
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TO-251 (unit: mm)
E
A
b2
C1
SYMBOL
MIN
MAX
A
2.19
2.38
A1
1.02
1.27
b
0.55
0.89
b2
5.21
5.46
C
0.46
0.58
C1
0.46
0.58
D
5.33
5.59
E
6.35
6.73
D
L
C
b
e
2.28 (TYP.)
L
7.62 (TYP.)
A1
e
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TO-252 (unit: mm)
E
C1
b2
A
D
H
L
b
e
A1
SYMBOL
MIN
MAX
A
2.19
2.38
A1
1.02
1.27
b
0.64
0.88
b2
5.21
5.46
C1
0.46
0.58
D
5.33
5.59
E
6.35
6.73
e
2.28 (TYP.)
H
9.40
10.42
L
0.51
-
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AIC1740
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SOT-223 (unit: mm)
1.80 MAX
D
B1
13 ° ± 3
E
°
H
e
A1
B
13 ° ± 3 °
3 (PLCS)
SYMBOL
MIN
MAX
A1
0.02
0.12
B
0.60
0.80
B1
2.90
3.15
C
0.24
0.35
D
6.30
6.80
E
3.30
3.70
e
C
H
2.30 (TYP.)
6.70
7.30
0° ~ 10 °
0.91 MIN
13 ° ± 3 °
l SOT-223 MARKING
Part No.
Marking
AIC1740-18
AZ18
AIC1740-20
AZ20
AIC1740-25
AZ25
AIC1740-27
AZ27
AIC1740-30
AZ30
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