Datasheet
5
LT3028
3028f
TYPICAL PERFOR A CE CHARACTERISTICS
UW
Quiescent Current (Per Output)
TEMPERATURE (°C)
–50
QUIESCENT CURRENT (µA)
100
3028 G07
050–25 25 75 125
50
45
40
35
30
25
20
15
10
5
0
V
IN
= 6V
R
L
= 250k, I
L
= 5µA
V
SHDN
= V
IN
TEMPERATURE (°C)
–50
ADJ PIN VOLTAGE (V)
100
3028 G08
050
1.240
1.235
1.230
1.225
1.220
1.215
1.210
1.205
1.200
–25 25 75 125
I
L
= 1mA
INPUT VOLTAGE (V)
0
QUIESCENT CURRENT (µA)
40
35
30
25
20
15
10
5
0
16
3028 G09
42 6 10 14 18
8
12
20
V
SHDN
= V
IN
T
J
= 25°C
R
L
= 250k
V
SHDN
= 0V
ADJ1 or ADJ2 Pin Voltage Quiescent Current (Per Output)
Output 2 GND Pin Current
INPUT VOLTAGE (V)
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
GND PIN CURRENT (mA)
3028 G10
0123
4
5
678910
T
J
= 25°C
*FOR V
OUT
= 1.22V
R
L
= 12.2Ω
I
L
= 100mA*
R
L
= 24.4Ω
I
L
= 50mA*
R
L
= 122Ω
I
L
= 10mA*
R
L
= 1.22k
I
L
= 1mA*
Output 2
GND Pin Current vs I
LOAD
OUTPUT CURRENT (mA)
2.50
2.25
2.00
1.75
1.50
1.25
1.00
0.75
0.50
0.25
0
GND PIN CURRENT (mA)
3028 G11
0 102030
40
50
60 70 80 90 100
V
IN
= V
OUT(NOMINAL)
+ 1V
T
J
= 25°C
Output 1 GND Pin Current
INPUT VOLTAGE (V)
1200
1000
800
600
400
200
0
GND PIN CURRENT (µA)
3028 G12
0123
4
5
678910
R
L
= 24.4Ω
I
L
= 50mA*
R
L
= 122Ω
I
L
= 10mA*
R
L
= 1.22k
I
L
= 1mA*
T
J
= 25°C
V
IN
= V
SHDN
*FOR V
OUT
= 1.22V
Output 1 GND Pin Current
Output 1
GND Pin Current vs I
LOAD
SHDN1 or SHDN2 Pin Threshold
(On-to-Off)
INPUT VOLTAGE (V)
12
10
8
6
4
2
0
GND PIN CURRENT (mA)
3028 G13
0123
4
5
678910
R
L
= 2.44Ω
I
L
= 500mA*
R
L
= 4.07Ω
I
L
= 300mA*
R
L
= 12.2Ω
I
L
= 100mA*
T
J
= 25°C
V
IN
= V
SHDN
*FOR V
OUT
= 1.22V
OUTPUT CURRENT (mA)
12
10
8
6
4
2
0
GND PIN CURRENT (mA)
3028 G14
0 50 100 150
200
250
300 350 400 450 500
V
IN
= V
OUT(NOMINAL)
+ 1V
T
J
= 25°C
TEMPERATURE (°C)
–50
SHDN PIN THRESHOLD (V)
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
0
50
75
3028 G15
–25
25
100
125
I
L
= 1mA