LTM4605
TYPICAL PERFORMANCE CHARACTERISTICS
(Refer to Figure 16)
100
90
80
70
60
50
40
30
Ef?ciency vs Load Current
6V IN to 12V OUT
100
90
80
70
60
50
40
30
Ef?ciency vs Load Current
12V IN to 12V OUT
95
85
75
65
55
45
Ef?ciency vs Load Current
18V IN to 12V OUT
20
10
0
CCM
DCM
BURST
20
10
0
CCM
DCM
BURST
35
25
15
CCM
DCM
SKIP CYCLE
0.01
0.1 1
10
0.01
0.1 1
10
0.01
0.1 1
10
100
100
95
90
85
80
75
LOAD CURRENT (A)
Ef?ciency vs Load Current
3.3μH Inductor (CCM)
4605 G01
100
95
90
85
80
75
70
LOAD CURRENT (A)
Ef?ciency vs Load Current
1.5μH Inductor (CCM)
4605 G02
100
95
90
85
80
75
70
LOAD CURRENT (A)
Ef?ciency vs Load Current
1.5μH Inductor (CCM)
4605 G03
70
65
60
18V IN TO 5V OUT
12V IN TO 5V OUT
5V IN TO 5V OUT
65
60
55
50
18V IN TO 3.3V OUT
12V IN TO 3.3V OUT
5V IN TO 3.3V OUT
65
60
55
50
18V IN TO 2.5V OUT
12V IN TO 2.5V OUT
5V IN TO 2.5V OUT
0
3
6
9
12
0
3
6
9
12
0
3
6
9
12
I OUT
2A/DIV
V OUT
200mV/DIV
LOAD CURRENT (A)
Transient Response from
6V IN to 12V OUT
4605 G04
I OUT
2A/DIV
V OUT
200mV/DIV
LOAD CURRENT (A)
Transient Response from
12V IN to 12V OUT
4605 G05
I OUT
2A/DIV
V OUT
100mV/DIV
LOAD CURRENT (A)
Transient Response from
18V IN to 12V OUT
4605 G06
200μs/DIV
4605 G07
200μs/DIV
4605 G08
200μs/DIV
4605 G09
LOAD STEP: 0A TO 3A AT CCM
OUTPUT CAPS: 4x 22μF CERAMIC CAPS AND
2x 180μF ELECTROLYTIC CAPS
2x 15mΩ SENSING RESISTORS
LOAD STEP: 0A TO 3A AT CCM
OUTPUT CAPS: 4x 22μF CERAMIC CAPS AND
2x 180μF ELECTROLYTIC CAPS
2x 15mΩ SENSING RESISTORS
LOAD STEP: 0A TO 4A AT CCM
OUTPUT CAPS: 4x 22μF CERAMIC CAPS AND
2x 180μF ELECTROLYTIC CAPS
2x 15mΩ SENSING RESISTORS
4605fc
5
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