Datasheet

LTC3853
32
3853fa
TYPICAL APPLICATIONS
Triple 3.3V/2.5V/12V, 5A Step-Down Converter with R
SENSE
Synchronized at 400kHz
TG1 TG2
BOOST1,2,3
SW1
SW2
BG1 BG2
SENSE1
+
MODE/PLLIN
SENSE2
+
SENSE1
–
SENSE2
–
V
FB1
V
FB2
I
TH1,2,3
V
IN
INTV
CC
DRV
CC12
LTC3853
20k
1%
FREQ/PLLFLTR
ILIM
PGND
PGOOD12
SGND
TK/SS1,2,3
V
FB3
SENSE3
–
SENSE3
+
SW3
TG3
BG3
RUN1,2,3
PGOOD3
10Ω*
10Ω*
20k
1%
10k
43.2k
1%
4.7µF
V
OUT1
3.3V
5A
V
OUT2
2.5V
5A
10k
1%
0.008Ω
5%
V
OUT3
12V
4A
V
IN
13V TO 24V
C
ITH1,2,3
R
ITH1,2,3
1000pF*
PLLIN
400kHz
220µF
4V
M1, M2, M3: Si4816BDY
CHANNEL 1: R
ITH1
= 18k, C
ITH1
= 1500pF, C
P1
= 220pF
CHANNEL 2: R
ITH2
= 18k, C
ITH2
= 1500pF, C
P2
= 220pF
CHANNEL 3: R
ITH3
= 43k, C
ITH3
= 470pF, C
P3
= 330pF
C
P1,2,3
33µF
35V
C
SS1,2,3
0.1µF
1000pF
1000pF*
10nF
1000pF*
10Ω*
10pF
10Ω*
2.2µH
3.3µH
6.8µH
22pF
C
B1,2,3
0.1µF
SW1,2,3
D
B1,2,3
M2M1 M3
+
220µF
4V
+
220µF
16V
3853 TA02
+
140k
1%
10Ω*
10Ω*
63.4k
1%
0.008Ω
5%
10pF
0.011Ω
5%
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC
EXTV
CC
Triple 1.8V/1.2V/2.5V, 15A High Current Step-Down Converter with R
SENSE
, f
SW
= 400kHz
TG1 TG2
BOOST1,2,3
SW1
SW2
BG1 BG2
SENSE1
+
SENSE2
+
SENSE1
–
SENSE2
–
V
FB1
V
FB2
I
TH1,2,3
V
IN
INTV
CC
DRV
CC12
LTC3853
MODE/PLLIN
20k
1%
FREQ/PLLFLTR
ILIM
PGND
PGOOD12
SGND
EXTV
CC
TK/SS1,2,3
V
FB3
SENSE3
–
SENSE3
+
SW3
TG3
BG3
RUN1,2,3
PGOOD3
100Ω*
100Ω*
20k
1%
2.55k
10k
1%
4.7µF
10k
INTV
CC
V
OUT1
1.8V
15A
V
OUT2
1.2V
15A
20k
1%
0.002Ω
5%
V
OUT3
2.5V
15A
V
IN
6.5V TO 14V
C
ITH1,2,3
R
ITH1,2,3
1000pF*
660µF
2.5V
M1, M3, M5: RJK0305DPB
M2, M4, M6: RJK0301DPB
CHANNEL 1: R
ITH1
= 15k, C
ITH1
= 1500pF, C
P1
= 330pF
CHANNEL 2: R
ITH2
= 10k, C
ITH2
= 1500pF, C
P2
= 220pF
CHANNEL 3: R
ITH3
= 13k, C
ITH3
= 1500pF, C
P3
= 330pF
C
P1,2,3
180µF
16V
C
SS1,2,3
0.1µF
1000pF
1000pF*
1000pF*
100Ω*
100Ω*
0.47µH
0.56µH
0.78µH
C
B1,2,3
0.1µF
SW1,2,3
D
B1,2,3
M3
M4
M1
M2
M5
M6
100Ω*
+
660µF
2.5V
47pF
+
660µF
4V
3853 TA03
+
43.2k
1%
100Ω*
24.9k
1%
0.002Ω
5%
22pF
0.002Ω
5%
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC