LTC3858-1 Linear Technology Corporation, LTC3858-1 Datasheet - Page 33

• Manufacturer Part Number: LTC3858-1
• Description: Dual 2-Phase Synchronous Step-Down Controller
• Manufacturer: Linear Technology Corporation

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TYPICAL APPLICATIONS
High Effi ciency Dual 1V/1.2V Step-Down Converter with Inductor DCR Current Sensing
C
C
C
ITH2
C
ITH1A
115k
ITH2
R
R
ITH1A
115k
115k
R
R
R
60k
FREQ
115k
A2
R
65k
C
FREQ
A2
A1
C
1000pF
A1
ITH1
1000pF
ITH1
220pF
200pF
1000pF
57.6k
1000pF
28.7k
56pF
56pF
R
28.7k
57.6k
R
C
C
56pF
56pF
R
R
C
C
B1
B2
F1
F2
B1
F1
B2
C
F2
R
R
C
R
ITH2A
ITH1
R
ITH2A
ITH1
ITH2
ITH2
C
C
0.1μF
0.1μF
C
C
1nF
SS1
SS2
1nF
3.93k
C1
C2
3.93k
SS1
SS2
220pF
3.43k
C1
C2
3.93k
220pF
0.01μF
0.01μF
0.01μF
0.01μF
High Effi ciency Dual 1V/1.2V Step-Down Converter
SENSE1
SENSE1
V
I
SS1
PLLIN/MODE
SGND
EXTV
RUN1
RUN2
FREQ
SS2
I
V
SENSE2
SENSE2
TH1
TH2
SENSE1
SENSE1
V
I
SS1
PLLIN/MODE
SGND
EXTV
RUN1
RUN2
FREQ
SS2
I
V
SENSE2
SENSE2
FB1
FB2
TH1
TH2
FB1
FB2
CC
CC
LTC3858-1
LTC3858-1
+
–
–
+
R
R
+
–
–
+
S1
S2
1.18k
1.18k
PGOOD1
BOOST1
BOOST2
PGOOD1
BOOST1
BOOST2
INTV
INTV
PGND
PGND
SW1
SW2
BG1
TG1
BG2
SW1
TG2
SW2
BG1
V
TG1
BG2
TG2
V
CC
IN
CC
IN
100k
C
L1, L2: SUMIDA IHL P2525CZERR47M06
MTOP1, MTOP2: RENESAS RJK0305
MBOT1, MBOT2: RENESAS RJK0328
100k
C
L1: SUMIDA CDEP105-3R2M
L2: SUMIDA CDEP105-7R2M
MTOP1, MTOP2: RENESAS RJK0305
MBOT1, MBOT2: RENESAS RJK0328
OUT1
OUT1
INTV
INTV
, C
, C
D1
D2
CC
D1
D2
OUT2
CC
OUT2
C
0.47μF
C
0.47μF
: SANYO 2R5TPE220M
C
0.47μF
C
0.47μF
B1
B2
: SANYO 2RSTPE220M
B1
B2
C
4.7μF
C
4.7μF
INT
INT
MTOP2
MBOT1
MTOP1
MBOT2
MBOT1
MTOP1
MTOP2
MBOT2
C
22μF
C
22μF
0.47μH
0.47μH
IN
IN
L1
L2
0.47μH
0.47μH
V
12V
V
12V
IN
L1
IN
L2
R
R
SENSE1
4mΩ
SENSE2
4mΩ
38581 TA05
38581 TA03a
C
220μF
C
220μF
OUT1
2
OUT2
2
C
220μF
C
220μF
OUT1
2
OUT2
2
V
1.2V
8A
V
1V
8A
OUT2
OUT1
V
1.2V
8A
V
1V
8A
OUT2
OUT1
LTC3858-1
33
38581f