LOW DROPOUT
REGULATOR
Austin Semiconductor, Inc.
AS1185
ELECTRICAL CHARACTERISTICS: The • denotes specifications which apply over the
operating temperature range, otherwise specifications are at TA = 25°C. Adjustable version,
VIN = 7.4V, VOUT = 5V, IOUT = 1mA, RLIM = 5.6k, unless otherwise noted.
PARAMETER
Reference Voltage (@ FB Pin)
MIN
TYP
2.37
0.3
MAX
UNITS
V
CONDITION
VIN - VOUT = 5V, VOUT = VREF
1mA < IOUT < 2.7A
±1
%
Rference Voltage Tolerance (@ FB Pin)2
V
IN - VOUT = 1.2V to VIN = 30V
•
•
1
±2.5
%
P < 25W6, VOUT = 5V
9
TMIN < TJ < TMAX
VOUT = VREF
Feedback Pin Bias Current
Dropout Voltage3
0.7
2.0
µA
V
IOUT = 0.5A, VOUT = 5V
IOUT = 2.7A, VOUT = 5V
IOUT = 5mA to 2.7A
0.20
0.67
0.37
1.00
V
Load Regulation7
Line Regulation7
0.05
0.3
%
V
IN - VOUT = 1.5V to 10V, VOUT = 5V
VIN - VOUT = 1V to 20V, VOUT = 5V
OUT = 1A4, VOUT = VREF
0.002
4.0
0.01
%/V
V
I
Minimum Input Voltage
IOUT = 2.7A
4.3
V
1.5V < VIN - VOUT < 10V
3.3
3.1
2.0
1.0
0.2
3.6
4.2
4.4
4.2
2.6
1.0
A
•
•
•
•
A
Internal Current Limit
(See Graph for Guaranteed Curve)8, 12
VIN - VOUT = 15V
VIN - VOUT = 20V
VIN - VOUT = 30V
3
A
1.7
0.4
A
A
External Current Limit Programming
Constant
5k < RLIM < 15k, VOUT = 1V11
•
15k
A•W
1A < ILIM < 2.7A
0.02 ILIM 0.06 ILIM + 0.03
0.04 ILIM 0.09 ILIM + 0.05
A
A
External Current Limit Error
Quiescent Supply Current
RLIM = 15k • A/ILIM
•
•
IOUT = 5mA, VOUT = VREF
4V < VIN < 25V5
2.5
3.5
mA
10
•
•
•
25
10
2
40
25
7
mA/A
mA/A
µA
VIN - VOUT = VSAT
Supply Current Change with Load
VIN - VOUT > 2V
REF Pin Shutoff Current
Thermal Regulation
(See Applications Information)
Reference Voltage Temperature
Coefficient8
0.4
IN - VOUT = 10V, IOUT = 5mA to 2A8
0.005
0.003
0.014
0.01
%/W
%/°C
V
AS1185
AustinSemiconductor,Inc.reservestherighttochangeproductsorspecificationswithoutnotice.
Rev. 1.1 6/05
3