Datasheet

LTC3708
27
3708fb
APPLICATIONS INFORMATION
1μF
100k
4.7μF
5V
10Ω
TG1
BOOST1
SW1
SENSE1
+
BG1
SENSE1
–
PGND1
V
FB1
TRACK2
I
ON1
I
TH1
INTLPF
RUN/SS
V
CC
DRV
CC
LTC3708
PGOOD
TG2
BOOST2
SW2
SENSE2
+
C
B1
0.1μF
C
B2
0.1μF
M2
M1
D
B1
D
B2
B340LA
B340LA
V
OUT1
2.5V
15A
19.1k
1%
12.1k
1%
V
IN
3.32k 470pF
475Ω
V
IN
15k
6.04k
1%
6.04k
1%
R
ON1
1.5M
24.9k
130k
5V
C
OUT1
330μF
4V
s2
L1
1.43μH
L2
1.22μH
M3 M4
12.1k
1%
f
IN
FREQ = 220kHz
SENSE2
–
PGND2
V
FB2
FCB
I
ON2
I
TH2
EXTLPF
TRACK1
SGND V
RNG1
V
RNG2
BG2
C
SS
0.1μF
0.01μF
0.047μF
470pF
150pF
1000pF
56pF
150pF1000pF
R
ON2
1.1M
1000pF
M1, M2: RENESAS HAT2168H
M3, M4: RENESAS HAT2165H
C
OUT1
: SANYO POSCAP 4TPD330M
C
OUT2
: SANYO POSCAP 2R5TPD470M
C
IN
: TAIYO YUDEN: TMK325BJ106KM
DB1, DB2: CMDSH-3
L1: PANASONIC ETQP3H1R4BF
L2: PANASONIC ETQP2H1R2BF
15k
6.04k
1%
470pF
3708 F17
V
OUT2
1.8V
15A
C
OUT2
470μF
2.5V
s2
C
IN
10μF
25V
s6
V
IN
7V TO 24V
+
+
+
Figure 17. High Effi ciency, Dual Output Power Supply with External Frequency Synchronization