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LTC3875
TYPICAL PERFORMANCE CHARACTERISTICS
Efficiency vs Output Current and
Mode (Figure 16 Application Circuit)
100
Burst Mode
90
OPERATION
80
70
60
CCM
50
PULSE-SKIPPING
40
30
20
10
0
0.01
0.1
1
LOAD CURRENT (A)
Load Step
(Figure 16 Application Circuit)
(Forced Continuous Mode)
I
LOAD
40A/DIV
5A TO 30A
I
I
L1,
L2
10A/DIV
V
OUT
100mV/DIV
AC-COUPLED
V
= 12V
10µs/DIV
IN
V
= 1.5V
OUT
Coincident Tracking
RUN
2V/DIV
V
OUT1
V
OUT2
1V/DIV
V
= 12V
2.5ms/DIV
IN
V
= 1.5V, R
= 12 , CCM
OUT1
LOAD
V
= 1V, R
= 6 , CCM
OUT2
LOAD
6
Efficiency vs Output Current and
Mode (Figure 16 Application Circuit)
100
90
80
Burst Mode
70
OPERATION
60
50
40
30
20
V
= 12V
10
IN
V
= 1.5V
OUT
0
10
100
0.01
3875 G01
Load Step
(Figure 16 Application Circuit)
(Pulse-Skipping Mode)
I
LOAD
40A/DIV
5A TO 30A
I
I
L1,
L2
10A/DIV
V
OUT
100mV/DIV
AC-COUPLED
V
= 12V
3875 G04
IN
V
OUT
Tracking Up and Down
with External Ramp
TK/SS1
TK/SS2
2V/DIV
V
OUT1
V
V
OUT1
OUT2
V
OUT2
500mV/DIV
3875 G07
V
= 12V
IN
V
= 1V, 1 LOAD
OUT1
V
= 1.5V, 1.5 LOAD
OUT2
For more information
CCM
PULSE-
SKIPPING
V
= 12V
IN
V
= 1V
OUT
0.1
1
10
100
LOAD CURRENT (A)
3875 G02
10µs/DIV
3875 G05
= 1.5V
V
OUT2
V
OUT1
10ms/DIV
3875 G08
www.linear.com/LTC3875
Load Step
(Figure 16 Application Circuit)
(Burst Mode Operation)
I
LOAD
40A/DIV
5A TO 30A
I
I
L1,
L2
10A/DIV
V
OUT
100mV/DIV
AC-COUPLED
V
= 12V
10µs/DIV
IN
V
= 1.5V
OUT
Prebiased Output at 1V
V
OUT
1V/DIV
V
+
OSNS
500mV/DIV
TK/SS
500mV/DIV
V
= 12V
2.5ms/DIV
IN
V
= 1.5V
OUT
CCM: NO LOAD
Quiescent Current
vs Temperature without EXTV
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
5.5
5.0
–50
–30
–10
10
30
50
TEMPERATURE (°C)
3875 G03
3875 G06
CC
70
90 110
130
3875 G09
3875fb
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