Datasheet

29
LTC1735
1735fc
TYPICAL APPLICATIO S
U
Selectable Output Voltage Converter with Burst Mode Operation Disabled for CPU Power
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
NC
C
OSC
RUN/SS
I
TH
FCB
SGND
V
OSENSE
PGOOD
SENSE
–
SENSE
+
NC
TG
BOOST
SW
V
IN
INTV
CC
BG
PGND
EXTV
CC
NC
LTC1735F
C
SS
0.1µF
C
B
0.22µF
0.1µF
4.7Ω
C
C2
47pF
47pF
C
C
330pF
R
C
33k
R
SENSE
0.004Ω
V
OUT
1.35V/1.60V
12A
1000pF
C
OSC
43pF
+
4.7µF
1µF
CER
+
C
OUT
470µF
6.3V
×3
KEMET
ON: V
OUT
= 1.60V
OFF: V
OUT
= 1.35V
C
IN
: MARCON THCR70EIH226ZT
C
OUT
: KEMET T510X447M006AS
L1: PANASONIC ETQP6F1R2HFA
R
SENSE
: IRC LRF2512-01-R004F
M1
FDS6680A
M2
FDS6680A
×2
1735 TA05
C
IN
22µF
×2
CER
D
B
CMDSH-3
R2
10k
1%
R1
14.3k
1%
47pF
47pF
10k
MBRS340T3
V
IN
4.5V TO 24V
L1
1.2µH
OPTIONAL:
CONNECT TO 5V
NC
NCNC
POWER GOOD
R3
33.2k
1%
SGND
VN2222
10Ω
10Ω
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
C
OSC
RUN/SS
I
TH
FCB
SGND
V
OSENSE
SENSE
–
SENSE
+
TG
BOOST
SW
V
IN
INTV
CC
BG
PGND
EXTV
CC
LTC1735
C
SS
0.1µF
C
C2
100pF
C
C
2200pF
R
C
3.3k
1M
V
OUT
10k
6.2V
FMMT625
R
SENSE
0.004Ω
22Ω
T1
V
IN
4V TO 40V
6
7
10
3
47Ω
R2
113k
1%
C
OUT
220µF
16V
×4
V
OUT
12V
3A
R1
8.06k
1%
3300pF
47pF
C
OSC
150pF
+
4.7µF
0.1µF
C
IN
: MARCON THCR70EIH226ZT
C
OUT
: AVX TPSV227M016R0150
T1: COILTRONICS VP5-0155
R
SENSE
: IRC LRF2512-01-R004F
M1
IRL2910S
M2
Si4850EY
MBRS1100
1735 TA07
+
100Ω
1nF
100V
1nF
100V
•
•
C
IN
22µF
50V
×2
CMDSH-3
4V to 40V Input to 12V Flyback Converter