DC1967A - Schematic

4
3
2
1
REVISION HISTORY
ECO
REV
DESCRIPTION
APPROVED
DATE
-
2
PRODUCTION FAB
GEORGE B.
9 - 17- 13
E10
VIN
4
D1
DFLS240L
C2S1
4700pF
5%
50V
0805
E1
Cx
EMBEDDED INDUCTOR
3
DISCONNECTED
CONNECTED
E2
JP1
43T
GND
C2P1
4700pF
5%
50V
0805
C2S2
0.022µF
5%
50V
0805
R1
1.40MEG
JP2
RUN
ON
VIN > 11V
OFF
R2
412k
16
C2P2
1800pF
5%
50V
0603
R3
10k
FREQ
1.5 MHz
750 kHz
JP3
7
6
Lr
47µH
R4
2.0k
PROG
5%
R12
100k
5%
E9
GND
E8
nFAULT
IN
FAULT
CHRG
RUN
INTVCC
NTC
E4
R11
100k
5%
E7
15
14
nCHRG
INTVCC
D2
DFLS240L
1
BOOST
2
C4
2.2µF
SW
4
CHGSNS
8
BAT
9
DHC
NTC
10
BATSNS/FB
13
PROG
R5
3.01k
6.3V
C3
0.01µF
3
L1
15.0uH
0603
VBAR
C1
10uF
16V
0805
E6
BAT
2.7 V - 11V
C2
400mA
47uF
16V
E5
1210
GND
R12 TO BE CONNECTED TO " BAT "
NODE AT BAT TURRET (E6)
NC/FBG
GND
VPROG
INTVCC
FREQ
12
4
5V - 40V
U1
LTC4120-4.2EUD / LTC4120EUD
3
D3
DFLS240L
Embedded
Inductor
E3
C5
10µF
50V
1210
D4
DFLZ39
39V
R9 *
11
R10 *
J1
OPT
GND
5
17
1
2
3
2
BAT
GND
ENTC
2
DF3-3P-2DSA
R8
0
JP4
NTC
INT
EXT
*
R6
0
R7
10k
ASSY
-A
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
-B
CUSTOMER NOTICE
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
1
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
4
3
2
U1
OPEN
1.40MEG
LTC4120EUD
APPROVALS
PCB DES.
APP ENG.
TECHNOLOGY
NC
GEORGE B.
R10
R9
LTC4120 - 4.2EUD
0 Ohm
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
400mA WIRELESS SYNCHRONOUS BUCK BATTERY CHARGER
SIZE
N/A
SCALE = NONE
DATE:
IC NO.
REV.
LTC4120 - 4.2EUD / LTC4120EUD
DEMO CIRCUIT 1967A - A / B
9 - 17 - 13
SHEET 1
1
2
OF
2
1
4
JP5
VBAR
3
2
MONITOR
ENABLE
3
U2A
5
LTC1445CDHD
DISABLE
R13
10k
2
4
VPROG
C6
0.01µF
4
7
1
LTC1445CDHD
V-REF
8
6
9
1
2
94%
5%
3
U2B
1.221V
LTC1445CDHD
CHG CURRENT
D12
149 17
5%
U2E
R32
1k
1
R15
22.6k
R14
432
1.186V
1
2
81%
2
69%
2
56%
5%
3
11
16
LTC1445CDHD
R16
34.8k
10
R30
1k
D10
1
5%
149 17
U2D
LTC1445CDHD
R17
100k
3
4
D11
149 17
U2C
C7
1µF
10V
R31
1k
3
13
15
12
R29
1k
D9
1
5%
3
149 17
3
R18
100k
U3A
LTC1445CDHD
5
2
1.186V
2
44%
2
31%
149 17
3
U3B
LTC1445CDHD
7
1
6
R20
100k
2
D8
1
5%
4
R19
100k
R28
1k
R27
1k
D7
1
5%
149 17
2
3
U3C
LTC1445CDHD
R21
100k
11
16
R26
1k
D6
1
2
19%
2
6%
5%
10
149 17
3
U3D
R22
100k
13
15
LTC1445CDHD
R25
1k
5%
12
D5
1
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
149 17
R23
100k
CUSTOMER NOTICE
R24
49.9k
4
C8
0.01µF
U3.3
C9
0.01µF
U2.3
R34
787k
C10
1µF
10V
3
V-REF
R35
432
9
1
8
R33
22.6k
U3E
LTC1445CDHD
LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A
CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;
HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO
VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL
APPLICATION. COMPONENT SUBSTITUTION AND PRINTED
CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT
PERFORMANCE OR RELIABILITY. CONTACT LINEAR
TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
APPROVALS
PCB DES.
NC
APP ENG.
GEORGE B.
TECHNOLOGY
TITLE: SCHEMATIC
BAR GRAPH FOR 400mA WIRELESS SYNCHRONOUS
BUCK BATTERY CHARGER
SIZE
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.
LTC4120 - 4.2EUD / LTC4120EUD
DEMO CIRCUIT 1967A-A/B
9 - 17 - 13
SHEET 2
1
2
OF
2
1
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