9
dc1626afa
DEMO MANUAL DC1626A
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
1.
5V
/
15
A
DCR SENSE FILTER / DIVIDER FOR PHASE 2
FS
W = 300kHz
4.
5V
-
26V
OFF
ON
RUN
2
OFF
RUN
1
ON
DCR SENSE FILTER / DIVIDER FOR PHASE 1
1.
2V
/
15
A
NOTE
:
TI
E S
G
ND P
IN TO P
G
ND P
A
D UNDE
RNE
A
TH I
C
.
FCM
DCM
SYN
C
60 DEG
90 DEG
120 DEG
CLKOUT
O
P
TIONAL COMPONENTS FOR SINGLE
OUTP
UT,
DUAL
PH
A
SE
O
PER
A
TIO
N
10
m
V /
A
LOAD S
TE
P
CIRCU
IT
#
1
IO
STEP
1+
LO
AD
STEP
5%
DUTY
CY
CLE
MA
X
VO
U
T1
LO
AD
STEP
10
m
V /
A
LOAD ST
EP
CIRCUI
T #
2
IO
STEP
2+
5%
DUTY
CY
CLE
MA
X
VO
U
T2
ALL CAPACITORS ARE IN MICROFARADS, 0603.
ASSY
L1
,L
2
NOT
ES: UNLESS O
TH
ER
W
IS
E
SPEC
IF
IE
D
1. ALL RESISTORS ARE IN OHMS, 0603.
-A (DCR SENSE)
2. INSTALL SHUNTS ON JUMPERS AS SHOWN.
-B (RSENSE)
Vishay IHLP4040DZ-01 0.56uH
WURTH 7443330068(0.68uH)
C16, C
3
0.1uF
1000pF
R32, R
18
4.02K
OPT
R34,R19
11K
OPT
0
OPT
R36
,R
20
R41,R4
5,
OPT
10
0.000 Ohm 2512
RS1, R
S2
0.0025 Ohm 2512
O
PT
IO
N
A
L COUT
ONLY ADD FOOTPRINTS
ON SOLDERMASK,
D
O
N
O
T S
H
O
W
IN
SCHEMATIC.
PHAS
M
D
MODE
-2
PE
T
S
OI
-1
PE
T
S
OI
2512
2512
R
29,R24
R
30
,R26
R31
R
21
R14,R1
5,
OPT
0
0
OPT
17.4K
20K
40.2K
45.3K
NOTE
:
EXTER
N
A
LLY TIE TH
E
DTR1 P
IN TO THE
DTR2
PIN
IF TH
E TR
A
N
SI
EN
T
D
ET
EC
T
CI
RCUIT IS U
SED
MIK
E S
.
PR
O
D
U
C
TI
O
N
11-
11-
5
2
__
REVISION HISTORY
ET
AD
N
OIT
PI
RC
SE
D
APPROVED
ECO
REV
2
Thursday, October 13, 2011
11
WI
DE
IN
PU
T RANGE
, HI
GH E
FFI
C
IEN
C
Y
DUAL S
TE
P-DOWN DC-DC CONV
ER
TE
R
HZ
MIK
E S
.
N/A
LTC3838EFE
DEMO CIRCUIT
1626A
SIZE
DATE:
.V
E
R
.
O
N
CI
SH
EET
O
F
TI
TL
E
:
APPROVALS
PCB D
ES
.
APP ENG
.
TECHNOLOGY
Fax: (408)4
34
-0
50
7
Milpitas,
CA 9503
5
Ph
one: (408)432-1900
1630 M
cCarthy Bl
vd
.
LTC Confidential-For Cu
st
om
er
U
se
O
nl
y
C
U
STOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BES
T
EF
FO
RT
T
O
D
ES
IG
N
A
CIRCUIT THAT MEETS CUSTOMER-
SUPPLIED SPE
CI
FI
CA
TI
O
NS
;
HOW
EVER, IT REMAINS THE
CU
ST
O
M
ER
'S
R
ESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERAT
IO
N
IN
T
HE
A
CT
UA
L
APPLICATION. COMPONENT SUBSTITUTION
A
ND
P
RI
NT
ED
CIRCUIT BOARD LAYOUT MAY SIGN
IFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT L
IN
EA
R
TE
C
H
N
O
LO
G
Y
A
PP
LI
C
A
TI
O
N
S ENGINEERING FOR ASSIST
ANCE.
THIS CIRCUIT IS PROPRIETARY TO LIN
EA
R
TE
CH
NO
LO
G
Y
AN
D
SCHEMA
TI
C
SU
PP
LI
ED
F
O
R
U
SE
W
IT
H
L
INEAR
TECHNOLOGY
PARTS.
SC
A
LE
= NONE
www.linear.com
SW
1
RUN1
RUN2
SW
2
EXT
VC
C
VO
U
T2
S2
+
S2
-
VIN
IN
TVC
C
EXTVC
C
VIN
S1
+
S1
-
VO
U
T1
S2
+
S2
-
IN
TVC
C
VFB
2
TRK/
S
S2
VRNG
2
VR
NG
1
S1
+
S1
-
TRK/
S
S1
TRK/
S
S2
VIN
IN
TVC
C
TRK/
S
S1
VO
U
T2
IN
TVC
C
IN
TVC
C
IN
TVC
C
VFB
2
IN
TVC
C
VR
NG
1
VR
NG
2
RUN
1
RUN2
VO
U
T1
VO
U
T2
VO
U
T1
VO
U
T2
IN
TVC
C
IN
TVC
C
R15
*
R21
*
R14
*
R48
0
J4
GND
R12 100K
COUT3 100uF 6.
3V
1206
R16
0
+
COUT5 330uF
7343-D15T
2.
5V
R4
OPT
R20
*
CI
N
4
10uF 35V 1210
+
COUT1 330uF
7343-D15T
2.
5V
C8 4.
7u
F
16V 0805
R50 OPT
CI
N
6
OPT 1210
E22
C16
*
+
COU
T1
6
OPT 7343-D15T
R47 OPT
C
14
0.
01uF
E18
PU
LS
E2
R6 OPT
C3
*
E1
PGOOD
2
E15
PG
O
O
D
1
J3
VO
U
T2
Q4
RJK0330D
PB
2
4
5
3
1
JP
2
1
2
3
4
R36
*
R35
0
L2
*
R45
*
R42 10
R30
*
+
COU
T1
4
OPT 7343-D15T
Q8
OPT
2
4
5
3
1
U1
LTC3838E
FE
1
2
3
4
6
7
29
30
31
33
8
9
10
32
34
35
36
37
38
39
5
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
DTR2
SENSE2-
VFB2
ITH2
VRNG2
PGND
INTVCC
EXTVCC
BG2
PHASEMD
MODE/PLLIN
CLKOUT
DRVCC2
SW2
TG2
BOOST2
PGOOD2
RUN2
PGND
TRACK/SS2
SGND
RT
VRNG1
ITH1
TRACK/SS1
VOU
VOUTSENSE1-
1
RT
D
-1
E
S
N
E
S
RUN1
PGOOD1
BOOST1
TG1
SW1
BG1
DRVCC1
VIN
JP
1
1
3
2
J6
GND
R27
2.
2
E9
CLKOUT
+
CI
N
1
100uF 35V
35
HV
100M
R17 10K
JP
4
1
3
2
Q6
OPT
2
4
5
3
1
R7
OPT
J7
1
2
3
4
5
C9 1uF
R53 0.
01
2010
J5
VO
U
T1
COUT8 100uF 6.
3V
1206
RS
1
*
COUT7 100uF 6.
3V
1206
E16
EXTVC
C
R29
*
R41
*
+
COUT6 330uF
7343-D15T
2.
5V
C
7
220pF
Q5
OPT
2
4
5
3
1
R55
0
CI
N
3
10uF 35V 1210
D2 CM
DS
H-3
+
OPT
7343-D15T
COUT
13
E17
PU
LS
E1
E10
TRK/
S
S1
E24
C
12
330pF
R1
OPT
R24
*
E19
GND
+
COUT2 330
uF
7343-D15T
2.
5V
E6
VO
2+
J8
1
2
3
4
5
R26
*
R34
*
C18 1uF
R19
*
R23 10K
CI
N
5
10uF
1210
35V
C10 0.
1u
F
C15 OPT
E5
VIN
-
Q3
RJK0305D
PB
2
4
5
3
1
C
5
0.
01uF
R13 15K
D1
CM
D
SH
-3
E7
VO
2-
J1
VIN
R32
*
R44 OPT
Q10 SU
D50N03-12P
3
1
2
C2 OPT
R18
*
E23
E21
GND
C
6
47pF
R46 10K
C11
47
pF
E20
GND
R37 OPT
+
CI
N
2
100uF 35V 35
HV
100M
R10 OPT
E11
VO
1_S
NS+
J2
GND
R51 10K
CI
N
8
(OP
T)
1210
C13 0.
1u
F
C4 0.
1u
F
R8
0
JP
3
1
2
3
4
R39
0
R40 10K
R11
0
Q1
RJK0305D
PB
2
4
5
3
1
C17 OPT
R49 OPT
RS
2
*
E2
RUN2
Q9 SU
D50N03-12P
3
1
2
E3
VIN
+
CI
N
7
(OPT
)
1210
COUT4 100uF 6.
3V
1206
L1
*
R38
100K
E8
PLLIN
E12
VO
1_SN
S-
Q7
OPT
2
4
5
3
1
Q2
RJK0330D
PB
2
4
5
3
1
R31
*
E4
TRK/
SS2
R25 2.
2
R28
137K
R54 0.
01
2010
R43 10
E25
R9
OPT
R52 10K
E14
RUN1
R3 OPT
C1 OPT
+
COU
T1
5
OPT 7343-D15T
