5
dc1820aabf
DEMO MANUAL
DC1820A-A/DC1820A-B
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
NOTES: UNLESS OTHERWISE SPECIFIED,
1. ALL RESISTOR AND CAPACITOR CASE SIZE ARE 0603.
XAL5030-472
COILCRAFT
[2]
VIN VOUT
[2]
VERSION IC
[3]
OPT
[2]
PG
VIN
EXTVCC
SVIN
VOUT
VOUTSW
INTVCC
INTVCC
INTVCC
INTVCC
INTVCC
6,=(
'$7(
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6+((7 2)
7,7/(
$33529$/6
3&%'(6
$33(1*
TECHNOLOGY
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3KRQH
0F&DUWK\%OYG
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&86720(5127,&(
/,1($57(&+12/2*<+$60$'($%(67())25772'(6,*1$
&,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216
+2:(9(5,75(0$,167+(&86720(565(63216,%,/,7<72
9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/
$33/,&$7,21&20321(1768%67,787,21$1'35,17('
&,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7
3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5
7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&(
7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1'
6&+(0$7,&
6833/,(')2586(:,7+/,1($57(&+12/2*<3$576
6&$/( 121(
ZZZOLQHDUFRP
4
09/21/12 13:00:26
11
HIGH EFFICIENCY LOW QUIESCENT
0,
<$1/
N/A
LTC3646EMSE/LTC3646EMSE-1
DEMO CIRCUIT 1820A-A/B
CURRENT STEP-DOWN CONVERTER
6,=(
'$7(
,&12 5(9
6+((7 2)
7,7/(
$33529$/6
3&%'(6
$33(1*
TECHNOLOGY
)D[
0LOSLWDV&$
3KRQH
0F&DUWK\%OYG
/7&&RQILGHQWLDO)RU&XVWRPHU8VH2QO\
&86720(5127,&(
/,1($57(&+12/2*<+$60$'($%(67())25772'(6,*1$
&,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216
+2:(9(5,75(0$,167+(&86720(565(63216,%,/,7<72
9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/
$33/,&$7,21&20321(1768%67,787,21$1'35,17('
&,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7
3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5
7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&(
7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1'
6&+(0$7,&
6833/,(')2586(:,7+/,1($57(&+12/2*<3$576
6&$/( 121(
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4
09/21/12 13:00:26
11
HIGH EFFICIENCY LOW QUIESCENT
0,
<$1/
N/A
LTC3646EMSE/LTC3646EMSE-1
DEMO CIRCUIT 1820A-A/B
CURRENT STEP-DOWN CONVERTER
6,=(
'$7(
,&12 5(9
6+((7 2)
7,7/(
$33529$/6
3&%'(6
$33(1*
TECHNOLOGY
)D[
0LOSLWDV&$
3KRQH
0F&DUWK\%OYG
/7&&RQILGHQWLDO)RU&XVWRPHU8VH2QO\
&86720(5127,&(
/,1($57(&+12/2*<+$60$'($%(67())25772'(6,*1$
&,5&8,77+$70((76&86720(56833/,('63(&,),&$7,216
+2:(9(5,75(0$,167+(&86720(565(63216,%,/,7<72
9(5,)<3523(5$1'5(/,$%/(23(5$7,21,17+($&78$/
$33/,&$7,21&20321(1768%67,787,21$1'35,17('
&,5&8,7%2$5'/$<2870$<6,*1,),&$17/<$))(&7&,5&8,7
3(5)250$1&(255(/,$%,/,7<&217$&7/,1($5
7(&+12/2*<$33/,&$7,216(1*,1((5,1*)25$66,67$1&(
7+,6&,5&8,7,635235,(7$5<72/,1($57(&+12/2*<$1'
6&+(0$7,&
6833/,(')2586(:,7+/,1($57(&+12/2*<3$576
6&$/( 121(
ZZZOLQHDUFRP
4
09/21/12 13:00:26
11
HIGH EFFICIENCY LOW QUIESCENT
0,
<$1/
N/A
LTC3646EMSE/LTC3646EMSE-1
DEMO CIRCUIT 1820A-A/B
CURRENT STEP-DOWN CONVERTER
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
YAN L.PROD
4
09/21/12
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
YAN L.PROD
4
09/21/12
REVISION HISTORY
DESCRIPTION DATEAPPROVEDECO REV
YAN L.PROD
4
09/21/12
C2 0.1uFC2 0.1uF
E5
GND
E5
GND
CIN2
10uF
50V
1210
CIN2
10uF
50V
1210
D1
DFLS1200
D1
DFLS1200
R12
619k
1%
R12
619k
1%
C8
OPT
C8
OPT
R4
OPT
R4
OPT
C6
2.2uF 50V
0805
C6
2.2uF 50V
0805
E2
VIN
E2
VIN
L1 4.7uHL1 4.7uH
R3
100k
R3
100k
C5
100pF
C5
100pF
JP2
MODE / SYNC
FCC
BURST
SYNC
JP2
MODE / SYNC
FCC
BURST
SYNC
1 2
3 4
5 6
JP5
EXTVCC
EXTVCC
VOUT
GND
JP5
EXTVCC
EXTVCC
VOUT
GND
1 2
3 4
5 6
JP1
ON
OFF
RUN
JP1
ON
OFF
RUN
1
3
2
CIN3
10uF
50V
1210
CIN3
10uF
50V
1210
E11
GND
E11
GND
E6
INTVCC
E6
INTVCC
+
CIN1
OPT
+
CIN1
OPT
E7
GND
E7
GND
E10
SYNC
E10
SYNC
C1
4.7uF
C1
4.7uF
C3
5.6pF
C3
5.6pF
E8
EXTVCC
E8
EXTVCC
E4
VOUT
E4
VOUT
C9
1uF
0805
C9
1uF
0805
U1
[3]
U1
[3]
BOOST
12
VFB
2
VON
5
PGOOD
6
SW
11
SVIN
16
EXTVCC
14
ITH
3
PVIN
10
RT
4
INTVCC
13
MODE/SYNC
7
RUN
15
SGND
1
PGND
17
NC
8
PVIN
9
C7
1uF
0805
C7
1uF
0805
10uF
COUT2
1210
16V
10uF
COUT2
1210
16V
R5
OPT
R5
OPT
C4
OPT
C4
OPT
R11
84.5k
1%
R11
84.5k
1%
4.7uF
COUT1
1210
16V
4.7uF
COUT1
1210
16V
R9
200k
1%
R9
200k
1%
R6
OPT
R6
OPT
R7
60.4k
1%
R7
60.4k
1%
E3
GND
E3
GND
R2
2
R2
2
E1
SVIN
E1
SVIN
E9
PGOOD
E9
PGOOD
JP3
VOUT SELECT
3.3V
5V
JP3
VOUT SELECT
3.3V
5V
1 2
3 4
R10
137k
1%
R10
137k
1%