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LTM8042/LTM8042-1
TYPICAL PERFORMANCE CHARACTERISTICS
LTM8042-1
T A = 25°C, unless otherwise noted.
97
95
93
Efficiency vs V IN , Buck Mode,
18.6V at 350mA LED String
90
80
70
60
Efficiency vs V IN , Buck-Boost
Mode, 3.7V at 350mA LED String
90
85
80
75
Efficiency vs V IN , Buck-Boost
Mode, 6.7V at 350mA LED String
91
50
40
70
65
60
89
87
85
30
20
10
0
55
50
45
40
21
23
25
27
29
31
33
0
10
20
30
40
0
5
10
15
20
25
30
90
85
80
75
70
65
60
55
50
V IN (V)
80421 G51
Efficiency vs V IN , Buck-Boost
Mode, 9.7V at 350mA LED String
90
85
80
75
70
65
60
V IN (V)
80421 G52
Efficiency vs V IN , Buck-Boost
Mode, 12.6V at 350mA LED String
88
86
84
82
80
78
76
74
72
70
V IN (V)
80421 G53
Efficiency vs V IN , Buck-Boost
Mode, 15.6V at 350mA LED String
0
5
10
15
20
25
30
0
5
10
15
20
25
0
10
15
20
87
85
83
81
V IN (V)
80421 G54
Efficiency vs V IN , Buck-Boost
Mode, 18.6V at 350mA LED String
400
350
300
250
200
V IN (V)
80421 G55
Maximum LED Current vs Input
Voltage, Boost Operation
400
350
300
250
200
V IN (V)
80421 G56
Maximum LED Current vs Input
Voltage, Buck Mode
79
77
75
150
100
50
0
6.3V AT 350mA
15.5V AT 350mA
18.6V AT 350mA
21.7V AT 350mA
24.8V AT 350mA
150
100
50
0
3.2V AT 350mA
6.3V AT 350mA
9.4V AT 350mA
12.4V AT 350mA
15.5V AT 350mA
18.6V AT 350mA
5
7
9
11
13
15
0
5
10
15
20
25
0
10
20
30
40
V IN (V)
80421 G57
INPUT VOLTAGE (V)
80421 G58
INPUT VOLTAGE (V)
80421 G59
80421fa
10
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