Datasheet

LT3975
4
3975f
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency at 3.3V
OUT
No-Load Supply Current No-Load Supply Current
Reference Voltage Load Regulation Line Regulation
Efficiency at 5V
OUT
Efficiency at 3.3V
OUT
Efficiency at 5V
OUT
T
A
= 25°C, unless otherwise noted.
LOAD CURRENT (A)
0
EFFICIENCY (%)
80
90
100
2
3975 G01
70
60
75
85
95
65
55
50
0.5
1
1.5
2.5
12V
24V
36V
f
SW
= 800kHz
V
OUT
= 5V
L = MSS1260-332NL
LOAD CURRENT (A)
0
EFFICIENCY (%)
70
80
90
2
3975 G02
60
50
65
75
85
55
45
40
0.5
1
1.5
2.5
12V
24V
36V
FRONT PAGE APPLICATION
V
OUT
= 3.3V
L = MSS1260-332NL
LOAD CURRENT (mA)
0.01
0
EFFICIENCY (%)
20
40
60
0.1
1
10 100
3975 G03
1000
80
100
10
30
50
70
90
10000
12V
24V
36V
f
SW
= 800kHz
V
OUT
= 5V
L = MSS1260-332NL
LOAD CURRENT (mA)
0.01
0
EFFICIENCY (%)
20
40
60
0.1
1
10 100
3975 G03
1000
80
10
30
50
70
90
10000
12V
24V
36V
FRONT PAGE APPLICATION
V
OUT
= 3.3V
L = MSS1260-332NL
INPUT VOLTAGE (V)
0
1.0
INPUT CURRENT (µA)
1.5
2.5
3.0
3.5
4.5
5
25
35
3975 G05
2.0
4.0
20
45
10
15
30
IN REGULATION
V
OUT
= 3.3V
40
TEMPERATURE (°C)
10
INPUT CURRENT (µA)
1000
10000
–55 65 125
3975 G06
1
5–25 95 15535
100
FRONT PAGE APPLICATION
V
IN
= 12V
V
OUT
= 3.3V
DUE TO CATCH
DIODE LEAKAGE
TEMPERATURE (°C)
–55
REFERENCE VOLTAGE (V)
1.190
1.220
1.225
1.230
5
65
95
3975 G07
1.180
1.175
1.210
1.200
1.185
1.215
1.170
1.205
1.195
–25
35
125
155
INPUT VOLTAGE (V)
0
CHANGE IN V
OUT
(%)
–0.05
0
0.05
1.5
2.5
3975 G08
–0.10
–0.15
–0.20
0.5 1 2
0.10
0.15
0.20
V
IN
= 12V
V
OUT
= 5V
INPUT VOLTAGE (V)
5
–0.05
CHANGE IN V
OUT
(%)
–0.04
–0.02
–0.01
0
0.05
0.02
15
25
30 45
2975 G09
–0.03
0.03
0.04
0.01
10 20
35
40
V
OUT
= 5V
LOAD = 1A