Datasheet

4
LT1528
1528fa
Quiescent CurrentDropout Voltage
Guaranteed Dropout Voltage
TEMPERATURE (°C)
–50
DROPOUT VOLTAGE (V)
25
LT1528 • TPC02
–25 0 50
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
75 100 125
I
LOAD
= 3A
I
LOAD
= 1.5A
I
LOAD
= 300mA
I
LOAD
= 10mA
I
LOAD
= 700mA
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (mA)
25
LT1528 • TPC03
–25 0 50
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
75 100 125
V
SHDN
= OPEN
V
SHDN
= 0V
V
IN
= 4.3V
R
L
= ∞
SENSE Pin Voltage GND Pin CurrentQuiescent Current
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
2000
1750
1500
1250
1000
750
500
250
0
8
LT1528 • TPC04
213579
4
6
10
I
LOAD
= 0
R
LOAD
= ∞
V
SHDN
= OPEN (HIGH)
V
SHDN
= 0V
TEMPERATURE (°C)
–50
SENSE PIN VOLTAGE (V)
25
LT1528 • TPC05
–25 0 50
3.400
3.375
3.350
3.325
3.300
3.275
3.250
3.225
3.200
75 100 125
I
LOAD
= 1mA
SHDN Pin Threshold
(On-to-Off)
GND Pin CurrentGND Pin Current
INPUT VOLTAGE (V)
0
GND PIN CURRENT (mA)
100
90
80
70
60
50
40
30
20
10
0
8
LT1528 • TPC07
213579
4
6
10
T
J
= 25°C
V
OUT
= V
SENSE
*FOR V
OUT
= 3.3V
R
L
= 1.1Ω
I
LOAD
= 3A*
R
L
= 2.2Ω
I
LOAD
= 1.5A*
R
L
= 4.7Ω
I
LOAD
= 700mA*
OUTPUT CURRENT (A)
0
DROPOUT VOLTAGE (V)
0.5
1.0
1.5 2.0
LT1528 • TPC01
2.5
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
3.0
T
J
≤ 125°C
T
J
≤ 25°C
= TEST POINTS
OUTPUT CURRENT (A)
0
GND PIN CURRENT (mA)
0.5
1.0
1.5 2.0
LT1528 • TPC08
2.5
100
90
80
70
60
50
40
30
20
10
0
3.0
T
J
= 125°C
T
J
= –50°C
T
J
= 25°C
V
IN
= 3.3V
DEVICE IS OPERATING
IN DROPOUT
INPUT VOLTAGE (V)
0
0
GND PIN CURRENT (mA)
1
3
4
5
7
1
5
7
LT1528 • TPC06
2
6
4
9
10
2
3
68
R
L
= 6.6Ω
I
LOAD
= 500mA*
R
L
= 11Ω
I
LOAD
= 300mA*
R
L
= 33Ω
I
LOAD
= 100mA*
R
L
= 330Ω: I
LOAD
= 10mA*
T
J
= 25°C
V
OUT
= V
SENSE
*FOR V
OUT
= 3.3V
TEMPERATURE (°C)
–50
SHDN PIN THRESHOLD (V)
2.0
1.8
1.6
1.4
1.2
1.0
0.8
0.6
0.4
0.2
0
0
50
75
LT1528 • TPC09
–25
25
100
125
I
LOAD
= 1mA
TYPICAL PERFOR A CE CHARACTERISTICS
UW