Datasheet

LT3991/LT3991-3.3/LT3991-5
4
3991fa
Typical perForMance characTerisTics
Efficiency, V
OUT
= 3.3V No Load Supply Current No Load Supply Current
LT3991 Feedback Voltage LT3991-3.3 Output Voltage LT3991-5 Output Voltage
Efficiency, V
OUT
= 5V Efficiency, V
OUT
= 3.3V Efficiency, V
OUT
= 5V
T
A
= 25°C, unless otherwise noted.
LOAD CURRENT (A)
EFFICIENCY (%)
3991 G01
100
40
50
60
70
80
90
30
0 1.210.80.60.40.2
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
V
OUT
= 5V
R1 = 1M
R2 = 309k
LOAD CURRENT (A)
EFFICIENCY (%)
3991 G02
90
30
40
50
60
70
80
20
0 1.210.80.60.40.2
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
LOAD CURRENT (mA)
EFFICIENCY (%)
3991 G03
100
30
20
10
40
50
60
70
80
90
0
0.01 10001001010.1
V
IN
= 36V
V
IN
= 48V
V
OUT
= 5V
R1 = 1M
R2 = 309k
V
IN
= 24V
V
IN
= 12V
LOAD CURRENT (mA)
EFFICIENCY (%)
3991 G04
90
30
20
10
40
50
60
70
80
0
0.01 10001001010.1
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
V
IN
= 48V
TEMPERATURE (°C)
INPUT CURRENT (µA)
3991 G05
100
10
1
–55 –25 1551259565355
DIODES, INC.
DFLS2100
INPUT VOLTAGE (V)
5
INPUT CURRENT (µA)
2.0
2.5
45
3991 G06
1.5
1.0
15
25
30
55
3.0
35
10
20
50
40
LT3991-5
LT3991-3.3
OUTPUT IN REGULATION
TEMPERATURE (°C)
FEEDBACK VOLTAGE (V)
3991 G07
1.205
1.180
1.185
1.190
1.195
1.200
1.175
–55 15565 95 125355–25
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
3.315
3.330
3.345
35 95
3991 G28
3.300
3.285
–25 5
65 125
155
3.270
3.255
TEMPERATURE (°C)
–50
OUTPUT VOLTAGE (V)
5.02
5.04
5.06
35 95
3991 G29
5.00
4.98
–25 5
65 125
155
4.96
4.94