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