Datasheet

LT3990/LT3990-3.3/LT3990-5
4
3990fa
TYPICAL PERFORMANCE CHARACTERISTICS
LT3990-3.3 Output Voltage LT3990-5 Output Voltage
No-Load Supply Current
No-Load Supply Current
Maximum Load Current Maximum Load Current
Efficiency, V
OUT
= 3.3V Efficiency, V
OUT
= 5V LT3990 Feedback Voltage
T
A
= 25°C, unless otherwise noted.
LOAD CURRENT (mA)
50
EFFICIENCY (%)
60
70
80
90
0.01 101 100
3990 G01
10
20
40
30
0.1
V
IN
= 12V
V
IN
= 48V
FRONT PAGE APPLICATION
V
OUT
= 3.3V
R1 = 1M
R2 = 576k
V
IN
= 24V
V
IN
= 36V
LOAD CURRENT (mA)
50
EFFICIENCY (%)
60
70
80
90
0.01 101 100
3990 G02
20
40
30
0.1
V
IN
= 12V
V
IN
= 48V
FRONT PAGE APPLICATION
V
IN
= 36V
V
IN
= 24V
TEMPERATURE (°C)
–50
FEEDBACK VOLTAGE (V)
1.210
1.215
1.220
25 75 150
3990 G03
1.205
1.200
1.195
–25 0
50
100 125
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
3.30
3.31
3.32
25 75 150
3990 G04
3.29
3.28
3.27
–25 0
50
100 125
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
5.00
5.02
5.04
25 75 150
3990 G05
4.98
4.96
4.94
–25 0
50
100 125
INPUT VOLTAGE (V)
5
1.5
SUPPLY LEVEL (µA)
2.0
2.5
3.0
3.5
4.0
15
25 35 45
3990 G06
55
FRONT PAGE APPLICATION
V
OUT
= 3.3V
R1 = 1M
R2 = 576k
LT3990-3.3
TEMPERATURE (°C)
–50
SUPPLY CURRENT (µA)
9
12
15
25 75 150
3990 G07
6
3
0
–25 0
50
100 125
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 3.3V
R1 = 1M
R2 = 576k
INPUT VOLTAGE (V)
5
350
LOAD CURRENT (mA)
400
450
500
650
600
550
15 25 35 45
3990 G08
55
FRONT PAGE APPLICATION
V
OUT
= 3.3V
TYPICAL
MINIMUM
INPUT VOLTAGE (V)
5
350
LOAD CURRENT (mA)
400
450
500
650
600
550
15 25 35 45
3990 G09
55
FRONT PAGE APPLICATION
V
OUT
= 5V
TYPICAL
MINIMUM