Using the Dual 28V Input Voltage Charger with Linear Regulator, Rev. 1.0

Freescale Semiconductor

3

Evaluation Board Specification

4

Evaluation Board Specification

The evaluation board is designed to work as a standalone charger, or as an embedded charger in a handheld system.

Figure 3 shows its schematic circuit. The normal operation range of the evaluation board is:

For AC charger:

VAC_MIN = 4.3V, VAC_MAX = 6.8V

IAC_MAX = 1200mA

For USB charger:

VUSB_MIN = 4.3V, VUSB_MAX = 5.85V

IUSB_MAX = 400mA

Figure 3. The Schematic Circuit of the Evaluation Board

J10

HDR_1 X2

1

2

J1 1

HDR_ 1X2

1

2

R9

13. 3K

R8

13 .0 K

BAT

BAT

R11

20 0K

C5

1. 0U F

R10

28. 7K

J12

H D R _1X2

1

2

R3

6. 49

R2

13.0K

R1

26. 1K

TP26

IU SB

U1

MC 34 676 B

AC

1

USB

2

PP R

3

CHG

4

USB EN

5

IMIN

6

IU SB

7

GN D

8

ISET

9

USBOUT

10

BAT

11

BA TD ET

12

TP28

IMI N

C2

NC

TP1

AC

1

TP1 0

VLo gic

1

TP1 3

USBE N

1

R5

47 0 OH M

R4

47 0 OH M

TP3

USB

1

J5

H D R _1X3

1

2

3

J4

HDR_1X3

R7

1 00K

R6

1 00K

D2

GR EEN

D1

RED

TP2 5

GN D

J1 3

HDR_1 X2

1

2

TP 17

USB

TP22

/ CHG

TP 15

AC

TP 16

BA TD ET

TP 18

VB AT

TP 19

USB OUT

TP2 4

GN D

TP2 3

GN D

TP20

ISET

TP2 7

USBE N

TP2 1

/P PR

TP1 1

/C H G

1

TP7

/P PR

1

J2

HDR _1X2

J1

HDR_ 1X2

J3

HDR_ 1X2

J

H

1

2

J6

HDR_ 1X2

1

2

J9

HDR_1 X2

1

2

J8

H D R _1X2

1

2

C4

1. 0U F

C3

1. 0U F

C1

1. 0U F

BAT