LTM4618
TYPICAL PERFORMANCE CHARACTERISTICS
100
95
90
85
Ef?ciency vs Load Current with
5V IN (CCM)
100
95
90
85
Ef?ciency vs Load Current with
12V IN (CCM)
95
90
85
80
Ef?ciency vs Load Current with
24V IN (CCM)
80
75
70
0
5V TO 0.8V OUT
5V TO 1.2V OUT
5V TO 1.5V OUT
5V TO 2.5V OUT
5V TO 3.3V OUT
1 2
3
4
5
6
80
75
70
0
1
2
3
12V TO 1.2V OUT
12V TO 1.5V OUT
12V TO 2.5V OUT
12V TO 3.3V OUT
12V TO 5V OUT
4 5
6
75
70
0
1
2
3
24V TO 2.5V OUT
24V TO 3.3V OUT
24V TO 5V OUT
4 5
6
LOAD CURRENT (A)
4618 G01
Ef?ciency vs Load Current with
Different Mode Settings
(12V to 3.3V)
100
V IN = 12V
90 V OUT = 3.3V
80
70
60
50
40
I OUT
1A/DIV
V OUT
50mV/DIV
LOAD CURRENT (A)
1.2V Transient Response
4618 G02
I OUT
1A/DIV
V OUT
50mV/DIV
LOAD CURRENT (A)
1.5V Transient Response
4618 G03
30
50μs/DIV
4618 G05
50μs/DIV
4618 G06
20
10
BURST
PULSE SKIP
V IN = 12V AND V OUT = 1.2V AT 3A/μs LOAD STEP
C OUT = 2 22μF 6.3V CERAMIC CAPACITOR
1 100μF 6.3V CERAMIC CAPACITOR
V IN = 12V AND V OUT = 1.5V AT 3A/μs LOAD STEP
C OUT = 2 22μF 6.3V CERAMIC CAPACITOR
1 100μF 6.3V CERAMIC CAPACITOR
0
0.01
0.1
CCM
1
1 220μF SANYO POSCAP
1 220μF SANYO POSCAP
LOAD CURRENT (A)
4618 G04
I OUT
1A/DIV
V OUT
50mV/DIV
2.5V Transient Response
I OUT
1A/DIV
V OUT
50mV/DIV
3.3V Transient Response
I OUT
1A/DIV
V OUT
100mV/DIV
5V Transient Response
50μs/DIV
4618 G07
50μs/DIV
4618 G08
50μs/DIV
4618 G09
V IN = 12V AND V OUT = 2.5V AT 3A/μs LOAD STEP
C OUT = 2 22μF 6.3V CERAMIC CAPACITOR
1 100μF 6.3V CERAMIC CAPACITOR
1 220μF SANYO POSCAP
V IN = 12V AND V OUT = 3.3V AT 3A/μs LOAD STEP
C OUT = 2 22μF 6.3V CERAMIC CAPACITOR
1 100μF 6.3V CERAMIC CAPACITOR
1 220μF SANYO POSCAP
V IN = 12V AND V OUT = 5V AT 3A/μs LOAD STEP
C OUT = 2 22μF 6.3V CERAMIC CAPACITOR
1 100μF 6.3V CERAMIC CAPACITOR
1 220μF SANYO POSCAP
4618fa
5
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