LTC3890
Typical applicaTions
High Efficiency Dual 12V/5V Step-Down Converter
+
SENSE1
INTV
CC
C1
1nF
R
B1
100k
100k
100k
–
PGOOD1
SENSE1
R
A1
6.98k
V
PGOOD2
BG1
FB1
C
100pF
R
ITH1A
MBOT1
R
SENSE1
9mΩ
V
12V
3A
OUT1
C
470pF
ITH1
ITH1
SW1
34.8k
L1
8µH
C
OUT1
BOOST1
ITH1
180µF
C
LTC3890
TRACK/SS1
C
SS1
0.01µF
B1
0.47µF
TG1
MTOP1
D1
I
LIM
V
IN
12.5V TO 60V
PHSMD
CLKOUT
PLLIN/MODE
V
IN
C
IN
220µF
INTV
CC
C
INT
4.7µF
SGND
PGND
EXTV
CC
RUN1
RUN2
FREQ
R
FREQ
D2
41.2k
TG2
MTOP2
C
0.47µF
C
SS2
0.01µF
B2
L2
4.7µH
R
BOOST2
SW2
SENSE2
10mΩ
TRACK/SS2
ITH2
V
5V
5A
OUT2
R
ITH2
20k
C
470pF
ITH2
C
OUT2
MBOT2
BG2
470µF
V
FB2
R
A2
18.7k
–
+
SENSE2
R
B2
100k
C2
1nF
SENSE2
3890 TA04
MTOP1, MTOP2, MBOT1, MBOT2: RJK0651DPB
L1: COILCRAFT SER1360-802KL
L2: COILCRAFT SER1360-472KL
C
C
: 16SVP180MX
OUT1
OUT2
: SANYO 6TPE470M
D1, D2: DFLS1100
3890fb
34
Linear Systems [ Linear Systems ]
