LTM4608A
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Load Current
Efficiency vs Load Current
Efficiency vs Load Current
100
CONTINUOUS MODE
100
CONTINUOUS MODE
100
CONTINUOUS MODE
95
90
85
95
90
85
95
90
85
80
75
70
0
2
5V IN 1.2V OUT
5V IN 1.5V OUT
5V IN 1.8V OUT
5V IN 2.5V OUT
5V IN 3.3V OUT
4
6
8
80
75
70
0
3.3V IN 1.2V OUT
3.3V IN 1.5V OUT
3.3V IN 1.8V OUT
3.3V IN 2.5V OUT
2 4
6
8
80
75
70
0
1
2
2.7V IN 1.0V OUT
2.7V IN 1.5V OUT
2.7V IN 1.8V OUT
3 4
5
6
7
100
90
80
70
60
LOAD CURRENT
Burst Mode Efficiency with
5V Input
4608A G01
4.0
3.5
3.0
2.5
2.0
1.5
LOAD CURRENT
V IN to V OUT Step-Down Ratio
4608A G02
4.0
3.5
3.0
2.5
2.0
1.5
LOAD CURRENT (A)
V IN to V OUT Step-Down Ratio
4608A G03
50
40
V OUT = 1.5V
V OUT = 2.5V
V OUT = 3.3V
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0 1.1
1.0
0.5
0
2
I OUT = 8A
V OUT = 1.2V
V OUT = 1.5V
3
4
V OUT = 1.8V
V OUT = 2.5V
V OUT = 3.3V
5
6
1.0
0.5
0
2
I OUT = 6A
V OUT = 1.2V
V OUT = 1.5V
3
4
V OUT = 1.8V
V OUT = 2.5V
V OUT = 3.3V
5
6
LOAD CURRENT (A)
4608A G04
V IN (V)
4608A G05
V IN (V)
4608A G06
1.6
1.4
1.2
1
0.8
0.6
Supply Current vs V IN
V O = 1.2V PULSE-SKIPPING MODE
V O = 1.2V BURST MOD E
I LOAD
1A/DIV
V IN
2V/DIV
V OUT
20mV/DIV
AC COUPLED
Load Transient Response
Load Transient Response
I LOAD
2A/DIV
V OUT
20mV/DIV
AC COUPLED
0.4
0.2
0
2.5
3
3.5
4
4.5
5
5.5
V IN = 5V 20μs/DIV
V OUT = 3.3V, R FB = 2.21k
2A/μs STEP
C OUT = 100μF X5R
C1 = 100pF, C3 = 22pF FROM FIGURE 18
4608A G08
V IN = 5V 20μs/DIV
V OUT = 2.5V, R FB = 3.09k
2.5A/μs STEP
C OUT = 100μF X5R
C1 = 120pF, C3 = 47pF FROM FIGURE 18
4608A G09
INPUT VOLTAGE (V)
4608A G07
4608afd
5
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