Datasheet

LTC3865/LTC3865-1
34
3865fb
TYPICAL APPLICATIONS
Figure 17. High Current, Single Output, 1.2V/30A Converter Using Sense Resistors
D3
D4
0.1µF
RJK0305DPB
RJK0330DPB
RJK0330DPB
L1
0.47µH
6800pF
100pF
0.1µF
0.1µF
162k
RUN1 RUN2
0
22µF
50V
C
OUT1
220µF
C
OUT1
, C
OUT2
: SANYO 4TPE 220µF
L1, L2: VISHAY IHLP4040DZERR47M11
100
100
1.21k
1%
2m
0.1µF
L2
0.47µH
C
OUT2
220µF
1.2V
30A
TG1 TG2
BOOST1 BOOST2
SW1 SW2
BG1
BG2
SGND
PGND
FREQ
SENSE1
+
SENSE2
+
VID21
SENSE1
–
SENSE2
–
V
OSENSE1
V
OSENSE2
I
TH1
I
TH2
V
IN
PGOOD INTV
CC
TK/SS1 TK/SS2
V
IN
7V TO 20V
3865 F17a
EXTV
CC
0.1µF
LTC3865
MODE/PLLIN
I
LIM
RUN2RUN1
VID22
VID12
VID11
2m
100
100
4.7µF
1µF
2.2Ω
+
+
+
RJK0305DPB
10µF
35V
10µF
35V
Effi ciency vs Load Current Load Step (Forced Continuous Mode)
LOAD CURRENT (A)
0
40
EFFICIENCY (%)
50
60
70
80
1 10 100
3865 F17b
30
20
10
0
90
100
V
IN
= 12V
Burst Mode
OPERATION
FORCED CONTINUOUS
MODE
PULSE-SKIPPING
MODE
40µs/DIVV
IN
= 12V
V
OUT
= 1.2V
V
OUT
200mV/DIV
AC-COUPLED
I
L
5A/DIV
I
LOAD
0A TO 20A/DIV
3865 F17c