Datasheet

LTC3853
31
3853fa
Figure 15. Triple 2.5V/1.8V/3.3V 5A Step-Down Converter with R
SENSE
, f
SW
= 500kHz
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
10Ω*
10Ω*
20k
1%
3.16k
24.9k
1%
4.7µF
10k
INTV
CC
V
OUT1
2.5V
5A
V
OUT2
1.8V
5A
20k
1%
0.008Ω
5%
V
OUT3
3.3V
5A
V
IN
7V TO 24V
C
ITH1,2,3
R
ITH1,2,3
1000pF*
220µF
4V
M1, M2, M3: Si4816BDY
CHANNEL 1: R
ITH1
= 18k, C
ITH1
= 1500pF, C
P1
= 220pF
CHANNEL 2: R
ITH2
= 12k, C
ITH2
= 1500pF, C
P2
= 220pF
CHANNEL 3: R
ITH3
= 18k, C
ITH3
= 1500pF, C
P3
= 220pF
C
P1,2,3
33µF
35V
C
SS1,2,3
0.1µF
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC
1000pF
1000pF*
1000pF*
10Ω*
10Ω*
1.5µH
1.5µH
2.2µH
10pF
C
B1,2,3
0.1µF
SW1,2,3
D
B1,2,3
M2M1 M3
10Ω*
+
220µF
4V
+
220µF
4V
3853 F15
+
63.4k
1%
10Ω*
43.2k
1%
0.008Ω
5%
10pF
0.008Ω
5%
APPLICATIONS INFORMATION