DC1967A_15 Datasheet, PDF (2/2 Pages) Linear Technology – 400mA WIRELESS SYNCHRONOUS BUCK BATTERY CHARGER

4
VBAR
VPROG
MONITOR
JP5
ENABLE DISABLE
R13
10k
5%
4
1.221V
C6
0.01µF
R14
U2E
432
LTC1445CDHD
C7
1µF
10V
R15
22.6k
R16
34.8k
R17
3
100k
R18
100k
R19
100k
R20
100k
2
R21
100k
R22
100k
R23
100k
1
R24
49.9k
4
C8
0.01µF
U3.3
3
U2A
LTC1445CDHD
U2B
LTC1445CDHD
1.186V
U2C
LTC1445CDHD
U2D
LTC1445CDHD
3
5
R32
1k
2
4
5%
149 17
3
7
R31
1k
1
6
5%
149 17
3
R30
11
1k
16
10
5%
149 17
3
13
R29
1k
15
12
5%
149 17
D12
1
2
CHG CURRENT
2
94%
D11
1
2
81%
D10
1
2
69%
D9
1
2
56%
1
4
3
3
U3A
5
LTC1445CDHD
R28
1k
D8
2
1
2
4
5%
44%
1.186V
U3B
LTC1445CDHD
149 17
3
7
R27
D7
1k
1
1
2
6
5%
31%
149 17
2
3
U3C
11
LTC1445CDHD
R26
1k
16
D6
1
2
19%
10
5%
149 17
3
U3D
13
LTC1445CDHD
R25
D5
1k
15
1
2
6%
12
5%
149 17
UNLESS NOTED:
RESISTORS: OHMS, 0402, 1%, 1/16W
CAPACITORS: uF, 0402, 10%, 50V
C9
0.01µF
U2.3
R33
22.6k
R35
432
R34
C10
787k
1µF
10V
3
U3E
LTC1445CDHD
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.
APPROVALS
PCB DES. NC
APP ENG. GEORGE B.
THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND
SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.
2
SCALE = NONE
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1
TITLE: SCHEMATIC
BAR GRAPH FOR 400mA WIRELESS SYNCHRONOUS
BUCK BATTERY CHARGER
SIZE IC NO. _{LTC4120 - 4.2EUD / LTC4120EUD}
REV.
N/A
DEMO CIRCUIT 1967A-A/B
2
DATE: 9 - 17 - 13
SHEET 2 OF 2
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