Datasheet

LTC3853
33
3853fa
TYPICAL APPLICATIONS
Dual 1.2V/2.5V High Current Step-Down Converter with R
SENSE
TG1 TG2
BOOST1,2,3
SW1
SW2
BG1 BG2
SENSE1
+
EXTV
CC
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
TK/SS3
V
FB3
SENSE3
–
SENSE3
+
SW3
TG3
BG3
RUN1,3
PGOOD3
RUN2
100Ω*
100Ω*
2.55k
4.7µF
10k
INTV
CC
V
OUT1
1.2V
30A
V
OUT1
20k
1%
0.002Ω
5%
V
OUT3
2.5V
15A
V
IN
6.5V TO 14V
C
ITH1,3
R
ITH1,3
1000pF*
660µF
2.5V
×2
CHANNEL 1: R
ITH1
= 10k, C
ITH1
= 1500pF, C
P1
= 220pF
CHANNEL 2: I
TH1
AND I
TH2
SHORTED TOGETHER,
TK/SS1 AND TK/SS2 SHORTED TOGETHER
CHANNEL 3: R
ITH3
= 13k, C
ITH3
= 1500pF, C
P3
= 330pF
C
P1,3
180µF
16V
C
SS3
0.1µF
TK/SS1
C
SS1
0.22µF
1000pF
1000pF*
1000pF*
100Ω*
200k
100Ω*
0.47µH
0.47µH
0.78µH
C
B1,2,3
0.1µF
SW1,2,3
D
B1,2,3
100Ω*
+
660µF
4V
3853 TA04
+
43.2k
1%
100Ω*
10k
1%
0.002Ω
5%
47pF
0.002Ω
5%
*THESE FILTER COMPONENTS NEED TO BE CLOSE TO THE IC