11
dc2181afa
DEMO MANUAL
DC2181A-A/B
schematic Diagram
4
4
3
3
2
2
1
1
4
4
3
3
2
2
1
1
UNLESS NOTED: RESISTORS: OHMS, 0402, 1%, 1/16W CAPACITORS: uF, 0402, 10%, 50V
OPT
EXT
1.5
M
Hz
INT
400mA
2.7 V - 4.
2V
750 kHz
1210
R1
0
TO
B
E C
ON
NE
CT
ED
T
O "
B
AT "
NO
DE
A
T B
AT
T
UR
RE
T
(E
4)
-B
ASSY
*
-A
1.40MEG
0 Ohm
OPEN
R10
R9
1.05MEG
LTC4120EUD - 4.2
LTC4120EUD
U1
OFF
Ru
n for Vin > 11V
ON
OPT
OPT
OPT
J2
NO
TE
: P
CB
A
E1 CONNECTS TO
J1 AND J2
J1
FIGURE
1.
AE1
OPT
D
o
*n
ot
* i
nstal
l R40
AND
R41
si
mul
taneousl
y
D
o
*n
ot
* i
nstal
l R38
AND
R39
si
mul
taneousl
y
3
DE
M
O
CI
RCUIT 2181A - A / B
1
2
400mA WIRELESS SYNCHRO
NO
US
B
UC
K
BATTERY
CH
AR
GE
R
N/A
LTC4120EUD - 4.2 / LTC4120EUD
NC
GEORGE B.
7 -
17
- 14
SIZE
DA
TE:
IC
N
O.
RE
V.
SHEE
T
OF
TITL
E:
APPROVALS
PC
B DES.
APP ENG
.
TECHNOLOGY
Fax: (408)434-0507
M
ilp
itas,
CA
95035
Phone: (408)432-1900
16
30
M
cCa
rthy
Bl
vd.
LT
C
Co
nf
idential-For
Customer
Use
Only
CUSTOME
R N
OT
IC
E
LI
NEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESI
GN A
CI
RC
UI
T T
HA
T M
EE
TS
C
US
TO
ME
R-
SU
PP
LI
ED
SPECI
FI
CATI
ONS;
HOWEVER,
IT
REMAI
NS THE CUSTOMER'
S RESPONSI
BI
LI
TY
TO
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FY
P
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SCHEMATIC
SUPPLI
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S.
SC
AL
E =
NONE
www.linear.com
GEORGE B.
PR
ODUCTION
3
7 -
17
- 14
-
REVISION HISTORY
DESCRIPTION
DATE
APPROVED
ECO
REV
VBAR
VPROG
IN
TV
CC
IN
TV
CC
IN
TV
CC
D1
DF
LS240L
C5 10µF
50V
E7
GND
E5
nCHRG
R40 0
C3 0.01µF
0603
R6 0
L1
15.0uH
C2S1 4700pF
5% 50V 0805
R4 2.0k
5%
C1 10uF
16V 0805
E4
BAT
R36 0
R10
*
U1 LTC4120EUD-4.2
/ LTC4120EU
D
16
13
1
5
12
17
9
3
6
10
7
2
4
8
15 14
11
RUN
PROG
INTVCC
GND
NTC
GND
BAT
IN
DHC
BATSNS/FB
FREQ
BOOST
SW
CHGSNS
FAULT
CHRG
NC/FBG
R39 0
E8
12V
- 4
0V
VIN
E2
PROG
R9
*
R37 0
GND
J2
E6
nFAU
LT
R5 3.01k
R2 412k
R38 0
R11 100k
5%
R41 0
D2 DF
LS
240L
E1
NTC
R1 1.40MEG
C2S2 0.022µF
5% 50V 0805
E3
GND
R7 10k
R12 100k
5%
C2 47uF
16V 1210
D3
DF
LS
240L
C4 2.2µ
F
6.3V
C2P2 1800pF
5% 50V 0603
R3
10k
R8
0
C2P1 4700pF
5% 50V 0805
J3
DF3-3P-2
DS
A
1 2 3
BAT
GND
ENTC
Cx
J1
39V
D4 DFLZ39
