5
dc1238bf
DEMO MANUAL DC1238B
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
SCHEMATIC DIAGRAM
5
5
4
4
3
3
2
2
1
1
D
D
C
C
B
B
A
A
7.
5V - 36V
ON
OF
F
5V /
500mA
*
* SEE QUI
C
K ST
ART
GUI
D
E
1.
A
L
L
R
ESI
ST
OR
S A
R
E
0603.
A
L
L
C
A
P
A
C
IT
O
R
S
A
R
E
0603.
NOTE:
UNLESS OTHERW
ISE SPECIFIED
0805
50V
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
R
EV
MO
LLY
Z.
P
R
O
DUCTIO
N
1
4-9-12
1
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
R
EV
MO
LLY
Z.
P
R
O
DUCTIO
N
1
4-9-12
1
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
R
EV
MO
LLY
Z.
P
R
O
DUCTIO
N
1
4-9-12
1
SIZE
DATE
:
IC NO
.
R
E
V
.
SH
EET
O
F
TITLE
:
APPRO
V
AL
S
PCB DES.
APP ENG
.
TECHNO
L
O
G
Y
Fax: (408)434-0507
M
ilp
it
as,
CA 95035
Phone: (408)432-1900
1630 M
cCarthy Bl
vd.
LTC
C
onf
ident
ial-
For C
u
st
om
er U
se Only
CUSTOMER NOTICE
L
INEAR T
E
CHNO
L
O
G
Y
HAS M
ADE A BEST
EF
F
O
RT
T
O
DESIG
N
A
CIRCUIT
T
HAT
M
EET
S CUST
O
M
E
R-
SUPPL
IED SPECIF
ICAT
IO
NS;
HO
W
EVER, IT REMAINS THE CUS
TO
MER'S RESPO
NSIBILITY TO
VERIF
Y PRO
PER AND REL
IABL
E O
PERAT
IO
N IN T
H
E ACT
UAL
APPL
ICAT
IO
N. CO
M
P
O
N
ENT
SUBST
IT
U
T
IO
N
AND PRINT
E
D
CIRCUIT
BO
ARD L
A
YO
UT
M
A
Y SIG
N
IF
ICANT
L
Y
AF
F
E
CT
CIRCUIT
PERF
O
RM
ANCE O
R
REL
IABIL
IT
Y
. CO
NT
ACT
L
INEAR
T
E
CHNO
L
O
G
Y
APPL
ICAT
IO
NS ENG
INEERING
F
O
R ASSIST
ANCE.
T
H
IS CIRCUIT
IS PRO
P
RIET
ARY T
O
L
INEAR T
E
CHNO
L
O
G
Y
AND
S
CHE
MATIC
SUPPL
IED F
O
R USE W
IT
H
L
INEAR T
E
CHNO
L
O
G
Y
PART
S.
S
CALE
=
NO
NE
w
w
w
.linear.com
1
Wed
nesd
ay,
Ju
ne
13,
2012
11
36V, 500mA STEP-DOWN DC/DC μ
M
ODULE
HZ
MOLLY
Z.
N/A
LTM8021EV
DEMO CIRCUIT 1238B
SIZE
DATE
:
IC NO
.
R
E
V
.
SH
EET
O
F
TITLE
:
APPRO
V
AL
S
PCB DES.
APP ENG
.
TECHNO
L
O
G
Y
Fax: (408)434-0507
M
ilp
it
as,
CA 95035
Phone: (408)432-1900
1630 M
cCarthy Bl
vd.
LTC
C
onf
ident
ial-
For C
u
st
om
er U
se Only
CUSTOMER NOTICE
L
INEAR T
E
CHNO
L
O
G
Y
HAS M
ADE A BEST
EF
F
O
RT
T
O
DESIG
N
A
CIRCUIT
T
HAT
M
EET
S CUST
O
M
E
R-
SUPPL
IED SPECIF
ICAT
IO
NS;
HO
W
EVER, IT REMAINS THE CUS
TO
MER'S RESPO
NSIBILITY TO
VERIF
Y PRO
PER AND REL
IABL
E O
PERAT
IO
N IN T
H
E ACT
UAL
APPL
ICAT
IO
N. CO
M
P
O
N
ENT
SUBST
IT
U
T
IO
N
AND PRINT
E
D
CIRCUIT
BO
ARD L
A
YO
UT
M
A
Y SIG
N
IF
ICANT
L
Y
AF
F
E
CT
CIRCUIT
PERF
O
RM
ANCE O
R
REL
IABIL
IT
Y
. CO
NT
ACT
L
INEAR
T
E
CHNO
L
O
G
Y
APPL
ICAT
IO
NS ENG
INEERING
F
O
R ASSIST
ANCE.
T
H
IS CIRCUIT
IS PRO
P
RIET
ARY T
O
L
INEAR T
E
CHNO
L
O
G
Y
AND
S
CHE
MATIC
SUPPL
IED F
O
R USE W
IT
H
L
INEAR T
E
CHNO
L
O
G
Y
PART
S.
S
CALE
=
NO
NE
w
w
w
.linear.com
1
Wed
nesd
ay,
Ju
ne
13,
2012
11
36V, 500mA STEP-DOWN DC/DC μ
M
ODULE
HZ
MOLLY
Z.
N/A
LTM8021EV
DEMO CIRCUIT 1238B
SIZE
DATE
:
IC NO
.
R
E
V
.
SH
EET
O
F
TITLE
:
APPRO
V
AL
S
PCB DES.
APP ENG
.
TECHNO
L
O
G
Y
Fax: (408)434-0507
M
ilp
it
as,
CA 95035
Phone: (408)432-1900
1630 M
cCarthy Bl
vd.
LTC
C
onf
ident
ial-
For C
u
st
om
er U
se Only
CUSTOMER NOTICE
L
INEAR T
E
CHNO
L
O
G
Y
HAS M
ADE A BEST
EF
F
O
RT
T
O
DESIG
N
A
CIRCUIT
T
HAT
M
EET
S CUST
O
M
E
R-
SUPPL
IED SPECIF
ICAT
IO
NS;
HO
W
EVER, IT REMAINS THE CUS
TO
MER'S RESPO
NSIBILITY TO
VERIF
Y PRO
PER AND REL
IABL
E O
PERAT
IO
N IN T
H
E ACT
UAL
APPL
ICAT
IO
N. CO
M
P
O
N
ENT
SUBST
IT
U
T
IO
N
AND PRINT
E
D
CIRCUIT
BO
ARD L
A
YO
UT
M
A
Y SIG
N
IF
ICANT
L
Y
AF
F
E
CT
CIRCUIT
PERF
O
RM
ANCE O
R
REL
IABIL
IT
Y
. CO
NT
ACT
L
INEAR
T
E
CHNO
L
O
G
Y
APPL
ICAT
IO
NS ENG
INEERING
F
O
R ASSIST
ANCE.
T
H
IS CIRCUIT
IS PRO
P
RIET
ARY T
O
L
INEAR T
E
CHNO
L
O
G
Y
AND
S
CHE
MATIC
SUPPL
IED F
O
R USE W
IT
H
L
INEAR T
E
CHNO
L
O
G
Y
PART
S.
S
CALE
=
NO
NE
w
w
w
.linear.com
1
Wed
nesd
ay,
Ju
ne
13,
2012
11
36V, 500mA STEP-DOWN DC/DC μ
M
ODULE
HZ
MOLLY
Z.
N/A
LTM8021EV
DEMO CIRCUIT 1238B
C5
(OPT)
C5
(OPT)
C1
1uF
C1
1uF
E4
VOU
T
E4
VOU
T
C2
4.
7uF
C2
4.
7uF
R2 0
R2 0
E7
GN
D
E7
GN
D
JP
1
JP
1
1
2
3
E5
BI
AS
E5
BI
AS
R3
51.
1K
R3
51.
1K
+
C4 10uF
+
C4 10uF
U1
LT
M8021EV
U1
LT
M8021EV
VI
N
A4
VI
N
A5
VI
N
B4
VI
N
B5
AD
J
A2
RUN/S
S
A1
GND
B1
GND
B2
GND
C1
GND
C2
GND
D1
GND
D2
GND
D3
GND
D4
GND
D5
GND
E1
GND
E2
GND
E3
GND
E4
GND
E5
GND
F1
GND
F2
GND
G1
GN
D
G2
GN
D
H1
GN
D
H2
VOU
T
F3
VOU
T
F4
VOU
T
F5
VOUT
G3
VOUT
G4
VOUT
G5
VOUT
H4
VOUT
H5
BI
AS
H3
E6
GN
D
E6
GN
D
E1
VI
N
E1
VI
N
E3
RUN/S
S
E3
RUN/S
S
C3
(OPT)
C3
(OPT)
R1
19.
1K
0402
R1
19.
1K
0402
Downloaded from
Downloaded from
Downloaded from
Downloaded from
Downloaded from
