DC2445A - Schematic

4
3
2
1
REVISION HISTORY
ECO
REV
DESCRIPTION
APPROVED
DATE
-
1
PRODUCTION
GEORGE B.
9 - 25 - 15
PRESENCE DETECT
IN
12 - 40V
D4
DFLZ39
39V
D1
DFLS240L
4
E10
E9
R37
24.9k
C2S1
0.033µF
5%
50V
1206/0805
C2S2
TBD
50V
0805
OPT
D2
DFLS240L
D3
BZT52C15
13V
E1
R1
1.40MEG
JP2
RUN
ON
VIN > 11V
OFF
R2
412k
M1
Si7308DN
DISCONNECTED
CONNECTED
EMBEDDED INDUCTOR
E2
GND
JP1
16
R11
100k
5%
IN
RUN
FAULT
JP3
FREQ
CHRG
E8
15
FAULT
14
7
FREQ
INTVCC
Q1
MMBT3904LT1
LRx
47µH
BOOST
6
C11
47µF
6.3V
0805
SW
CHGSNS
BAT
E3
E4
PROG
12
R4
2.0k
13
10
5%
2
C3
0.01µF
4
VPROG
3
L1
15.0µH
E6
9
C1
4.7µF
25V
0805
PROG
BATSNS/FB
NC/FBG
GND
R39
51k
5%
M2
Si2343CDS
8
NTC
R5
3.01k
R12
5.1k
5%
C4
2.2µF
6.3V
DHC
INTVCC
E7
1
R3
10k
NTC
CHRG
INTVCC
1.5 MHz
750 kHz
43T
Embedded
Inductor
3
R36
1k
5%
INTVCC
4
U1
LTC4120EUD-4.2 / LTC4120EUD
3
Cx
GND
C5
10µF
50V
1210
R10 *
R9 *
11
BAT
2.7 V - 11V
C2
400mA
47µF
16V
E5
1210
GND
R38
470k 5%
VBAR
GND
5
17
2
2
JP4
NTC
INT
R8
0
1
3
2
EXT
J1
OPT
BAT
ENTC
GND
DF3-3P-2DSA
R6
0
*
R7
10k
ASSY
-A
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
-B
CUSTOMER NOTICE
R9
R10
OPEN
0 Ohm
TECHNOLOGY
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
400mA WIRELESS SYNCHRONOUS BUCK BATTERY CHARGER
3
2
N/A
SCALE = NONE
1.05MEG
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
TITLE: SCHEMATIC
SIZE
4
1.40MEG
LTC4120EUD
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
NC
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG. GEORGE B.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
1
U1
LTC4120 - 4.2EUD
DATE:
IC NO.
REV.
LTC4120EUD - 4.2 / LTC4120EUD
DEMO CIRCUIT 2445A - A / B
9 - 25 - 15
SHEET
1
1
1
OF
2
1
VBAR
JP5
MONITOR
ENABLE
3
U2A
LTC1445CDHD
DISABLE
R13
10k
VPROG
5
2
4
C6
0.01µF
7
1
R15
22.6k
1.186V
R31
1k
2
81%
2
69%
2
56%
2
44%
2
31%
2
19%
2
6%
D11
1
5%
149 17
3
U2C
11
16
LTC1445CDHD
R16
34.8k
10
R30
1k
D10
1
5%
149 17
U2D
LTC1445CDHD
R17
100k
3
13
15
12
R29
1k
D9
1
5%
149 17
R18
100k
U3A
LTC1445CDHD
3
5
2
4
1.186V
R19
100k
R28
1k
D8
1
5%
149 17
U3B
LTC1445CDHD
3
7
1
6
R20
100k
R27
1k
D7
1
5%
149 17
3
U3C
LTC1445CDHD
R21
100k
11
16
R26
1k
D6
1
5%
10
149 17
3
U3D
R22
100k
13
15
LTC1445CDHD
12
R25
1k
5%
D5
1
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
149 17
R23
100k
CUSTOMER NOTICE
432
R24
49.9k
C8
0.01µF
U3.3
C9
0.01µF
U2.3
R34
787k
C10
1µF
10V
V-REF
R35
8
R33
22.6k
9
V-REF
8
6
9
94%
5%
LTC1445CDHD
C7
1µF
10V
2
3
U2B
1.221V
R14
432
CHARGE CURRENT
D12
1
149 17
5%
U2E
LTC1445CDHD
R32
1k
U3E
LTC1445CDHD
APPROVALS
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO PCB DES.
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
APP ENG.
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
TECHNOLOGY
NC
GEORGE B.
TITLE: SCHEMATIC
BAR GRAPH FOR 400mA WIRELESS SYNCHRONOUS
BUCK BATTERY CHARGER
SIZE
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
N/A
SCALE = NONE
1630 McCarthy Blvd.
Milpitas, CA 95035
Phone: (408)432-1900 www.linear.com
Fax: (408)434-0507
LTC Confidential-For Customer Use Only
DATE:
IC NO.
REV.
LTC4120EUD - 4.2 / LTC4120EUD
DEMO CIRCUIT 2445A - A / B
9 - 25 - 15
SHEET
1
2
OF
2
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