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AIC1740 Low Output Voltage, 500mA Low Dropout Linear Regulator
n FEATURES
l l l
n DESCRIPTION
The AIC1740 is a 3-pin low dropout linear 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 65A, 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 AIC1740 against fault conditions. The AIC1740 comes in the popular SOT-223, TO-251 and TO-252 packages.
l l
l l l
Low Dropout Voltage of 900mV at 500mA Output Current (3.0V Output Version). Guaranteed 500mA Output Current. Internal 1.5 P-MOSFET Draws no Base Current. Low Ground Current at 65A. 2% Accuracy Output Voltage of 1.8V/ 2.0V/ 2.5V/ 2.7V/ 3.0V. Input Voltage Range up to 12V. Needs only 4.7F for Stability. Current and Thermal Limiting.
n APPLICATIONS
l l l l l l
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.
n TYPICAL APPLICATION CIRCUIT
VIN VI N VOUT
AIC1740
VOUT
+
1F CI N
GND
+
10 F COUT
Low Dropout Linear Regulator
Analog Integrations Corporation DS-1740-00 Aug 2, 00
4F, 9, Industry E. 9th Rd, Science Based Industrial Park, Hsinchu Taiwan, ROC TEL: 886-3-5772500 FAX: 886-3-5772510
www.analog.com.tw
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AIC1740
n ORDERING INFORMATION
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
ORDER NUMBER
AIC1740-18CE AIC1740-20CE AIC1740-25CE AIC1740-27CE AIC1740-30CE (TO-252) AIC1740-18CF AIC1740-20CF AIC1740-25CF AIC1740-27CF AIC1740-30CF (TO-251)
PIN CONFIGURATION
FRONT VIEW 1: VOUT 2: GND 3: VIN
123
FRONT VIEW 1: VOUT 2: GND 3: VIN
123
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 .......... ... ... .............................. -40C~ 85C Operating Junction Temperature Range Storage Temperature Range ............................ ... ... ... .......................... -65C~150C
Power Dissipation ....... ... ... ... ... ... ... ... ... ... ... ... ... ..... ... ... ... ... ..... ... ............... 0.85W Thermal Resistance JC TO-251, TO-252 Package ....... ... .... ... .......... 12.5C/W SOT-223 Package ....... ... ... ... ..... ... ... .............15C/W
n TEST CIRCUIT
Refer to the TYPICAL APPLICATION CIRCUIT
2
AIC1740
n
ELECTRICAL CHARACTERISTICS (Ta=25C, CIN=1F, COUT=10F, unless otherwise
specified.) PARAMETER Output Voltage No Load AIC1740-30 AIC1740-27 AIC1740-25 AIC1740-20 AIC1740-18 (Note 1) TEST CONDITIONS VIN=4.0~12V VIN=4.0~12V VIN=4.0~12V VIN=4.0~12V VIN=4.0~12V MIN. 2.940 2.646 2.450 1.960 1.764 TYP. 3.0 2.7 2.5 2.0 1.8 50 MAX. 3.060 2.754 2.550 2.040 1.836 UNIT
V
Output Voltage Temperature Coefficiency Line Regulation Load Regulation (Note 2) Current Limit (Note 3) Dropout Voltage (Note 4)
PPM/C IL=1mA, VIN=4.0~12V VIN=5V, IL=0.1~500mA VIN=5V, VOUT=0V AIC1740s AIC1740-30 AIC1740-27 AIC1740-25 AIC1740-20 AIC1740-18 IL=0.1mA IL=500mA 3 20 650 0.2 900 950 1000 1260 1370 10 1050 1100 1150 1410 1520 10 50 mV mV mA mV
mV
Ground Current IO=0.1mA~IMAX, VIN=4V~12V 65 90 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.
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AIC1740
n TYPICAL
1400 1300 1200 1100 1000 900 800 700 600 500 400 300 200 100 00 50 100
PERFORMANCE CHARACTERISTICS
Dropout Voltage vs Load Current VOUT =1.8V VOUT =2.0V
VOUT COUT=1F V OUT =3.0V 200mV/DIV
Load Transient Response
Dropout Voltage (mV)
VOUT=2.5V V OUT=2.7V VOUT =3.0V
I OUT IOUT=0.1mA
I OUT=250mA
150
200
250
300
350
400
450
500
Load Current (mA)
Time (0.5mS/DIV)
Load Transient Response
COUT =10F VOUT=3.0V VOUT 50mV/DIV VIN VIN=4.0V COUT =1F IL=1mA
Line Transient Response
VIN =6V
I OUT =250mA I OUT IOUT=0.1mA VOUT VOUT =3.0V 20mV/DIV
Time (0.25mS/DIV)
Time (1mS/DIV)
Recommended Max. Output Current vs Input Voltage
600 550 500
Output Current (mA)
450 400 350 300 250 200 150 100 50 0 3 4 5 6 7 8 9 10 11 12
3.0V 1.8V 2.0V 2.7V 2.5V
Input voltage (V)
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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 4.7F (or greater) capacitor is required between the AIC1740 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 5 or less if Aluminum electrolytic type is used. Many Aluminum electrolytics have electrolytes that freeze at about -30C, so solid tantalums are A 0.1F capacitor (or greater) should be placed from the AIC1740 input to ground if the lead inductance between the input and power source exceeds 500nH (approximately 10 inches of trace). recommended for operation below -25C. The value of this capacitor may be increased without limit.
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AIC1740
n PHYSICAL DIMENSIONS
l TO-251 (unit: mm)
E A b2 C1
SYMBOL A A1 b
D
MIN 2.19 1.02 0.55 5.21 0.46 0.46 5.33 6.35
MAX 2.38 1.27 0.89 5.46 0.58 0.58 5.59 6.73
b2 C C1 D
L C
E e L
2.28 (TYP.) 7.62 (TYP.)
b e
A1
l
TO-252 (unit: mm)
E b2 C1 A
SYMBOL A A1 b
MIN 2.19 1.02 0.64 5.21 0.46 5.33 6.35
MAX 2.38 1.27 0.88 5.46 0.58 5.59 6.73
D
b2
H
C1 D E
L
e H L
2.28 (TYP.) 9.40 0.51 10.42 -
b
e
A1
6
AIC1740
l SOT-223 (unit: mm)
D 1.80 MAX B1 13 3
SYMBOL A1 B B1
E H e A1
MIN 0.02 0.60 2.90 0.24 6.30 3.30
MAX 0.12 0.80 3.15 0.35 6.80 3.70
C D E
B 3 (PLCS) 13 3
e
C
2.30 (TYP.) 6.70 7.30
H
0.91 MIN 13 3
0 ~ 10
l SOT-223 MARKING
Part No. AIC1740-18 AIC1740-20 AIC1740-25 AIC1740-27 AIC1740-30 Marking AZ18 AZ20 AZ25 AZ27 AZ30
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