Garmin MC34676B 4 Evaluation Board Specification

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_1X2

1

2

J11

HDR_1X2

1

2

R9

13.3K

R8

13.0K

BAT

BAT

R11

200K

C5

1.0UF

R10

28.7K

J12

HDR_1X2

1

2

R3

6.4

9

R2

13.0K

R1

26.1K

TP26

IUSB

U1

MC34676B

AC

1

USB

2

PPR

3

CHG

4

USBEN

5

IMIN

6IUSB 7

GND 8

ISET 9

USBOUT 10

BAT 11

BATDET 12

E-PAD

TP28

IMIN

C2

NC

TP1

AC

1

TP10

VLogic

1

TP13

USBEN

1

R5

470 OHM

R4

470 OHM

TP3

USB

1

J5

HDR_1X3

1

2

3

J4

HDR_1X3

1

2

3

R7

100K

R6

100K

D2

GREEN

21

D1

RED

21

TP25

GND

J13

HDR_1X2

1

2

TP17

USB

TP22

/CHG

TP15

AC

TP16

BATDET

TP18

VBAT

TP19

USBOUT

TP24

GND

TP23

GND

TP20

ISET

TP27

USBEN

TP21

/PPR

TP11

/CHG

1

TP7

/PPR

1

J2

HDR_1X2

1

2

J1

HDR_1X2

1

2

J3

HDR_1X2

1

2

J

H

1

2

J6

HDR_1X2

1

2

J9

HDR_1X2

1

2

J8

HDR_1X2

1

2

C4

1.0UF

C3

1.0UF

C1

1.0UF

BAT

Contents

Main Freescale Semiconductor Users Guide Document Number: KT34676BUG Rev. 1.0, 2/2009 1Purpose Using the High Input Voltage Charger for Single Cell Li-Ion Batteries (KIT34676EPEVBE) Contents Using the Dual 28V Input Voltage Charger with Linear Regulator, Rev. 1.0 Application Diagram 3 Application Diagram 3.1 Dual-Input Standalone Charger Figure 2. The Li-Ion Charger Embedded in the Hand Held System Figure 1. The dual-input Li-Ion Charger 3.2 Embedded Charger 4 Evaluation Board Specification Figure 3. The Schematic Circuit of the Evaluation Board 5 Component Selection 5.1 Input capacitors C1 and C3 5.2 Output capacitors C4 and C5 5.3 AC CC-mode charge current setting resistors R1, R2, and R3 5.4 USB CC-mode charge current setting resistors R8 and R9 5.5 End-of-charge current setting resistors R10 and R11 Table 2. The USB CC-mode Charge Current Settings Table 3. The EOC Current Settings Page Page 6.2 Layout considerations 7 Evaluation Board Configuration 7.1 Pin Headers Table 4. The Default Settings of the Pin Headers 7.2 Connector Pads Table 4. The Default Settings of the Pin Headers 7.3 Test Points 8 Test Setup with the Evaluation Board Figure 8. The AC Charger Set Up for the Evaluation Board Figure 9. The USB Charger Set Up for the Evaluation Board Using the Dual 28V Input Voltage Charger with Linear Regulator, Rev. 1.0 12 Freescale Semiconductor Bill of Material 9 Bill of Material Item Qty Part Reference Value DESCRIPTION Footprint Mfr PN 10 References How to Reach Us: