Datasheet

LT3973/LT3973-3.3/LT3973-5
5
3973fa
Typical perFormance characTerisTics
LT3973-3.3 Output Voltage
No-Load Supply Current
LT3973 Feedback Voltage
Efficiency, V
OUT
= 3.3V
Efficiency, V
OUT
= 3.3V
Efficiency, V
OUT
= 5V
Efficiency, V
OUT
= 5V
T
A
= 25°C, unless otherwise noted.
LOAD CURRENT (A)
50
EFFICIENCY (%)
60
70
80
90
0 0.5 0.60.3 0.4 0.7
3973 G01
20
40
30
0.1 0.2
V
IN
= 12V
V
IN
= 24V V
IN
= 36V
FRONT PAGE APPLICATION
V
OUT
= 3.3V
R1 = 1M
R2 = 576k
LOAD CURRENT (A)
50
EFFICIENCY (%)
60
70
80
90
0 0.5 0.6 0.7
3973 G02
30
40
0.1 0.2 0.3 0.4
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
FRONT PAGE APPLICATION
LOAD CURRENT (mA)
50
EFFICIENCY (%)
60
70
80
90
0.01 10010
3973 G03
20
40
30
0.1 1
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
FRONT PAGE APPLICATION
V
OUT
= 3.3V
R1 = 1M
R2 = 576k
LOAD CURRENT (mA)
50
EFFICIENCY (%)
60
70
80
90
0.01 100
3973 G04
30
40
0.1 1 10
V
IN
= 12V
V
IN
= 24V
V
IN
= 36V
FRONT PAGE APPLICATION
No-Load Supply CurrentLT3973-5 Output Voltage
TEMPERATURE (°C)
–50
FEEDBACK VOLTAGE (V)
1.210
1.215
1.220
25 75 150
3973 G05
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
3973 G06
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
3973 G07
4.98
4.96
4.94
–25 0
50
100 125
INPUT VOLTAGE (V)
1.5
SUPPLY CURRENT (µA)
2.0
2.5
3.0
1510 25
40
3973 G08
3.5
4.0
5 20
30 35
FRONT PAGE APPLICATION
V
OUT
= 3.3V
R1 = 1M
R2 = 576k
LT3973-3.3
TEMPERATURE (°C)
–50
SUPPLY CURRENT (µA)
20
15
30
25
35
25 75 150
3973 G09
10
5
0
–25 0
50
100 125
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 3.3V
R1 = 1M
R2 = 576k