AIC1740-25CF中文资料
L ow Output Voltage, 500mA Low Dropout
Linear Regulator
n FEATURES
l Low Dropout Voltage of 900mV at 500mA Output Current (3.0V Output Version).
l Guaranteed 500mA Output Current.
l Internal 1.5? P-MOSFET Draws no Base Current.
l Low Ground Current at 65μA.
l2% Accuracy Output Voltage of 1.8V/ 2.0V/
2.5V/ 2.7V/
3.0V.
l Input Voltage Range up to 12V.
l Needs only 4.7μF 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 Monitor Microprocessor.
l Voltage Regulator for RAM Module.
l Wireless Communication Systems.
l Battery Powered Systems.n DESCRIPTION
T he 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
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 AIC1740 against fault conditions.
T he AIC1740 comes in the popular SOT-223, TO-251 and TO-252 packages.
n TYPICAL APPLICATION CIRCUIT
Low Dropout Linear Regulator
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
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....…………………………………..……………..……............... 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
n ELECTRICAL CHARACTERISTICS (Ta=25°C, C IN
=1μF, C
OUT
=10μF, unless otherwise specified.)
PARAMETER TEST CONDITIONS
MIN.
TYP.MAX.UNIT
Output Voltage
N
o Load
A IC1740-30
A IC1740-27
A IC1740-25
A IC1740-20
A IC1740-18
V
IN =4.0~12V
V IN =4.0~12V
V IN =4.0~12V
V IN =4.0~12V V IN =4.0~12V 2.940
2.6462.4501.9601.764
3.02.72.52.01.8 3.0602.7542.5502.0401.836V
Output Voltage Temperature Coefficiency (Note 1)
50
PPM/°C
Line Regulation I L =1mA, V IN =4.0~12V 310mV Load Regulation (Note 2)
V IN =5V, I L =0.1~500mA 2050
mV Current Limit (Note 3)V IN =5V, V OUT =0V
650mA AIC1740s I L =0.1mA 0.210mV
Dropout Voltage (Note 4)
AIC1740-30AIC1740-27AIC1740-25AIC1740-20AIC1740-18
I L =500mA
900950100012601370
10501100115014101520mV
Ground Current I O =0.1mA~I MAX , V IN =4V~12V 6590μA 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
010020030040050060070080090010001100120013001400
D r o
p o u t V o l t a g e (m V )
Load Current (mA)
V OUT
I OUT
Time (0.5mS/DIV)
Load Transient Response
V OUT
I Time (0.25mS/DIV)
Load Transient Response
V IN
V IN =4.0V V OUT
V OUT =3.0V
Time (1mS/DIV)
V IN =6V
C OUT =1μF I L =1mA
20mV/DIV
O u t p u t C u r r e n t (m A )
Input voltage (V)
050100150200250300350400450500
550600
n BLOCK DIAGRAM
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 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 -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 AIC1740 input to ground if the lead inductance between the input and power source exceeds 500nH (approximately 10 inches of trace).
n PHYSICAL DIMENSIONS
l TO-251 (unit: mm)
SYMBOL MIN MAX
A 2.19 2.38
A1 1.02 1.27
b0.550.89
b2 5.21 5.46
C0.460.58
C10.460.58
D 5.33 5.59
E 6.35 6.73
e 2.28 (TYP.)
L7.62 (TYP.)
l TO-252 (unit: mm)
SYMBOL MIN MAX
A 2.19 2.38
A1 1.02 1.27
b0.640.88
b2 5.21 5.46
C10.460.58
D 5.33 5.59
E 6.35 6.73
e 2.28 (TYP.)
H9.4010.42 A1
L0.51-
l
SOT-223 (unit: mm)
SYMBOL MIN MAX A10.020.12B 0.600.80B1
2.90
3.15C 0.240.35D 6.30 6.80E 3.30 3.70e
2.30 (TYP.)
H
6.70
7.30
l SOT-223 MARKING
Part No.Marking AIC1740-18AZ18AIC1740-20AZ20AIC1740-25AZ25AIC1740-27AZ27AIC1740-30
AZ30