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