LTM4641
TYPICAL PERFORMANCE CHARACTERISTICS
(Figure 45 circuit with RfSET per Table 1 and RSET1A, RSET1B and RSET2 per Table 2, unless otherwise noted)
Efficiency vs Load Current at 36VIN
Efficiency vs Load Current at 24VIN
Efficiency vs Load Current at 12VIN
95
90
95
90
95
90
85
85
85
80
75
70
65
80
75
70
65
80
75
70
65
6.0V
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
6.0V
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
6.0V
5.0V
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OUT
60
60
60
0
3
5
6
7
8
9
10
0
3
5
6
7
8
9
10
0
3
5
6
7
8
9
10
1
2
4
1
2
4
1
2
4
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
4641 G01
4641 G02
4641 G03
Pulse-Skipping vs Forced
Continuous ꢁode Efficiency,
28VIN to 3.3VOUT
Efficiency vs Load Current at 6VIN
1V Transient Response, 38VIN
90
80
70
60
50
40
30
20
10
0
95
90
V
OUT
50mV/DIV
AC-COUPLED
FCB = INTV
CC
(PULSE-SKIPPING)
85
I
OUT
80
75
70
65
2.5A/DIV
FCB = SGND
FORCED
CONTINUOUS
4641 G06
20µs/DIV
0A TO 5A LOAD STEPS AT 5A/µs
FRONT PAGE CIRCUIT WITH
3.3V
2.5V
1.8V
1.5V
1.2V
1.0V
0.9V
OUT
OUT
OUT
OUT
OUT
OUT
OUT
OV
PGM
= OPEN CIRCUIT
60
0.1
0.001
0.01
1
10
0
3
5
6
7
8
9
10
1
2
4
OUTPUT CURRENT (A)
OUTPUT CURRENT (A)
4641 G05
4641 G04
3.3V Transient Response,
28VIN to 3.3VOUT
1V Transient Response, 4.5VIN
Output Start-Up, No Load
V
OUT
V
V
OUT
OUT
1V/DIV
50mV/DIV
50mV/DIV
AC-COUPLED
AC-COUPLED
I
IN
200mA/DIV
I
I
OUT
OUT
2.5A/DIV
2.5A/DIV
RUN
5V/DIV
4641 G07
4641 G08
4641 G09
20µs/DIV
0A TO 5A LOAD STEPS AT 5A/µs
FRONT PAGE CIRCUIT WITH
20µs/DIV
0A TO 5A LOAD STEPS AT 5A/µs
FIGURE 46 CIRCUIT
800µs/DIV
V
C
= 24V
IN
IN(MLCC)
= 2 × 10µF X7R
OV
= OPEN CIRCUIT
PGM
4641f
8
Linear [ Linear ]
