LTM4602
TYPICAL PERFORMANCE CHARACTERISTICS
(See Figure 21 for all curves)
100
90
80
Ef?ciency vs Load Current
with 5V IN (FCB = 0)
100
90
80
Ef?ciency vs Load Current
with 12V IN (FCB = 0)
100
90
80
Ef?ciency vs Load Current
with 20V IN (FCB = 0)
70
60
50
40
30
0
2
0.8V OUT
1.2V OUT
1.5V OUT
1.8V OUT
2.5V OUT
3.3V OUT *
*FOR 5V TO 3.3V CONVERSION,
SEE FREQUENCY ADJUSTMENT
IN APPLICATIONS INFORMATION
4 6 8
70
60
50
40
30
0
2
0.8V OUT
1.2V OUT
1.5V OUT
1.8V OUT
2.5V OUT
3.3V OUT
3.3V OUT (950kHz)*
*950kHz INSTEAD OF 1.3MHz
INCREASES 3.3V EFFICIENCY 2%
4 6 8
70
60
50
40
30
0
2
4
6
1.2V OUT
1.5V OUT
1.8V OUT
2.5V OUT
3.3V OUT
8
100
90
80
70
LOAD CURRENT (A)
Light Load Ef?ciency vs
Load Current with 12V IN
(FCB > 0.7V, <5V)
4602 G01
V OUT
50mV/DIV
I OUT
2A/DIV
LOAD CURRENT (A)
1.2V Transient Response
4602 G02
V OUT
50mV/DIV
I OUT
2A/DIV
LOAD CURRENT (A)
1.5V Transient Response
4602 G03
60
50
40
30
0
1.2VOUT
1.5VOUT
1.8VOUT
2.5VOUT
3.3VOUT
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
1
20 μ s/DIV
1.2V AT 3A/ μ s LOAD STEP
C OUT = 1 × 22 μ F, 6.3V CERAMICS
330 μ F, 4V SANYO POSCAP
4602 G05
20 μ s/DIV
1.5V AT 3A/ μ s LOAD STEP
C OUT = 1 × 22 μ F, 6.3V CERAMICS
330 μ F, 4V SANYO POSCAP
4602 G06
LOAD CURRENT (A)
4602 G04
V OUT
50mV/DIV
I OUT
2A/DIV
1.8V Transient Response
V OUT
50mV/DIV
I OUT
2A/DIV
2.5V Transient Response
V OUT
50mV/DIV
I OUT
2A/DIV
3.3V Transient Response
20 μ s/DIV
4602 G07
20 μ s/DIV
4602 G08
20 μ s/DIV
4602 G09
1.8V AT 3A/ μ s LOAD STEP
C OUT = 1 × 22 μ F, 6.3V CERAMICS
330 μ F, 4V SANYO POSCAP
2.5V AT 3A/ μ s LOAD STEP
C OUT = 1 × 22 μ F, 6.3V CERAMICS
330 μ F, 4V SANYO POSCAP
3.3V AT 3A/ μ s LOAD STEP
C OUT = 1 × 22 μ F, 6.3V CERAMICS
330 μ F, 4V SANYO POSCAP
4602fa
4
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