VCC

BATDRV

REGN

BTST

HIDRV

PHASE

LODRV

GND

SRP

SRN

Q4

Sis412DN

L1

4.7µH

SYSTEM

C10

10µF

RSR

10m?

R1

430 kW

R2

66.5 kW

C2

0.1µF

U1

bq24725A

C8

10uF

Q3

Sis412DN

Q5 (BATFET)

FDS6680A

C7

0.047µF

Adapter +

RAC 10 mW

Pack +

C6

1µF

HOST

Dig I/O

SMBus

+3.3V

C4

100 pF

R4

R5

R7

549 kW

ACN

ACP

CMSRC

ACDRV

ACDET

ILIM

SDA

SCL

ACOK

IOUT

Ci

2.2µF

Ri

2 ?

R9

10

R3

10 kW

R8

100 kW

R10

4.02 kW

R11

D1

BAT54

C9

10uF

C11

10µF

Pack -

C3

0.1µF

C5

1µF

R6

4.02 kW

C1

0.1µF

Total

Csys

220µF

C15

0.01µF

C16

0.1µF

C17

2200 pF

Adapter -

ADC

Q1 (ACFET)

FDS6680A

D3

PDS1040

PowerPad

C13

0.1µF

C14

0.1µF

R14

10

Ω

R15

7.5

Ω

*

*

4.02 kW

10 kW

10 kW

*

*

*

bq24725A

www.ti.com

SLUSAL0

– SEPTEMBER 2011

Use 0

Ω for better current sensing accuracy, use 10Ω/7.5Ω resistor for reversely battery connection protection. See

application information about negative output voltage protection for hard shorts on battery to ground or battery

reversely connection.

The total Csys is the lump sum of system capacitance. It is not required by charger IC. Use Ri and Ci for adapter hot

plug in voltage spike damping. See application information about input filter design.

Figure 2. Typical System Schematic with One NMOS Selector and Schottky Diode

Copyright

© 2011, Texas Instruments Incorporated

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