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3
DEMO MANUAL DC236
DESIGN-READY SWITCHERS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
TOP VIEW
G PACKAGE
28-LEAD PLASTIC SSOP
28
27
26
25
24
23
22
21
20
19
18
17
16
15
RUN/SS1
SENSE1
+
SENSE1
–
V
OSENSE1
FREQSET
STBYMD
FCB
I
TH1
SGND
3.3V
OUT
I
TH2
V
OSENSE2
SENSE2
–
SENSE2
+
FLTCPL
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
LTC1628CG
+
+
+
+
RUN/SS1
SENSE
+
SENSE1
–
V
OSENSE1
FREQSET
STBYMD
FCB
I
TH1
SGND
3.3V
OUT
I
TH2
V
OSENSE2
SENSE2
–
SENSE2
+
FLTCPL
TG1
SW1
BOOST1
V
IN
BG1
EXTV
CC
INTV
CC
PGND
BG2
BOOST2
SW2
TG2
RUN/SS2
1
2
3
4
5
6
7
8
9
10
11
12
13
14
28
27
26
25
24
23
22
21
20
19
18
17
16
15
U1
LTC1628
C7,1000pF
C13,180pF
R11,10
Ω
L2,10
µ
H
L1,10
µ
H
R2,0.015
Ω
R1,0.015
Ω
C5,0.1
µ
F
R3,105k,1%
R5
20k,1%
R9
1M
R12
1M
R10
1M
TP1
3.3V
LDO
TP2
5V
R4,63.4k,1%
R6,20k,1%
R8,15k
R7,15k
C11
1000pF
C3
0.1
µ
F
C18
0.1
µ
F
D1
MBRM
140T3
V
IN
5V TO
30V
V
OUT2
3.3V
4A PK
DC236 F02
V
OUT1
5V
4A PK
D2
MBRM
140T3
C17
22
µ
F
50V
C1,150
µ
F,6V
C2,180
µ
F,4V
SP CAP
GND
SP CAP
C16
4.7
µ
F
M1a
M1b
M2b
M2a
C4
0.1
µ
F
C15
1
µ
F
D4
D3
C12
1000pF
C10
33pF
C9
33pF
C19
C21
C20
C8,1000pF
C14,180pF
C6,0.1
µ
F
0.01
µ
F
×
3
SWITCHING FREQUENCY = 300kHz
D3, D4 = CMDSH-3TR
M1, M2 = FDS8936A
L1, L2 = PANASONIC N6 SERIES 10.1
µ
H
Figure 2. LTC1628 Fixed 5V/4A, 3.3V/4A, High Efficiency Dual Regulator
PACKAGE A D SCHE ATIC DIAGRA S
U
W
W