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

1.221V

U2.3

U3.3

DISABLE

MONITOR

1.186V

ENABLE

1.186V

CHG CURRENT

2

DEMO CIRCUIT 1967A-A/B

2

2

BAR GRAPH FOR 400mA WIRELESS SYNCHRONOUS

N/A

LTC4120 - 4.2EUD / LTC4120EUD

NC

GEORGE B.

BUCK BATTERY CHARGER

9 - 17 - 13

SIZE

DATE:

IC NO.

REV.

SHEET

OF

TITLE:

APPROVALS

PCB DES.

APP ENG.

TECHNOLOGY

Fax: (408)434-0507

Milpitas, CA 95035

Phone: (408)432-1900

1630 McCarthy Blvd.

LTC Confidential-For Customer Use Only

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.

THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND

SCHEMATIC

SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.

SCALE = NONE

www.linear.com

VPROG

VBAR

D12

94%

1

2

R21

100k

C8

0.01µF

R14

432

JP5

U2E

LTC1445CDHD

R25

1k

5%

R32

1k

5%

R16

34.8k

D6

19%

1

2

R19

100k

U3D

LTC1445CDHD

13

12

149

15

3

17

R20

100k

R26

1k

5%

U2C

LTC1445CDHD

11

10

149

16

3

17

C9

0.01µF

U3B

LTC1445CDHD

7

6

149

1

3

17

R17

100k

R24

49.9k

C6

0.01µF

R23

100k

U2D

LTC1445CDHD

13

12

149

15

3

17

R18

100k

R30

1k

5%

R35

432

C7

1µF

10V

R33

22.6k

R28

1k

5%

U3E

LTC1445CDHD

D10

69%

1

2

R29

1k

5%

C10

1µF

10V

R34

787k

D8

44%

1

2

D11

81%

1

2

D9

56%

1

2

D5

6%

1

2

R13

10k

5%

D7

31%

1

2

U3C

LTC1445CDHD

11

10

149

16

3

17

R31

1k

5%

R22

100k

R27

1k

5%

U2B

LTC1445CDHD

7

6

149

1

3

17

R15

22.6k

U2A

LTC1445CDHD

5

4

149

2

3

17

U3A

LTC1445CDHD

5

4

149

2

3

17