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SS6804

Three/Four-cell Lithium-Ion Battery Protection IC

FEATURES

Ultra-low quiescent current, 17

Ultra-low power-down current, 2.2

Wide supply voltage range: 2V to 18V.

Precision over-charge protection voltage:

4.35V

±30mV for the SS6804A

4.30V

±30mV for the SS6804B

4.25V

±30mV for the SS6804C

4.20V

±30mV for the SS6804D

Externally set over-charge, over-discharge and

over-current delay time.

Built-in cell-balancing bleeding network under

over-charge condition.

Three detection levels for over-current protection.

APPLICATIONS

Protection IC for three/four-cell lithium-ion battery packs.

DESCRIPTION

The SS6804 is designed to protect a lithium-ion

battery from damage or degraded lifetime due to

over-charging, over-discharging and over-current

for three- or four-cell lithium-ion battery powered

systems such as notebook PCs.

It provides the cell-balancing "bleeding" function

to automatically discharge the over-charged cell

until the over-charge condition is eliminated.

Safe charging with full utilization is ensured by

the accurate

±30mV over-charge detection. Four

different specification values for over-charge

protection voltage are provided for various

protection requirements. The very low standby

current represents little drain from the cell while in

storage.

TYPICAL APPLICATION CIRCUIT

0.1

µF

C4

0.1

µF

C2

0.1

µF

C3

0.1

µF

C1

R6

1M

1M

R5

R7

1M

BATT-

SS6

804

1

16

6

7

8

5

4

OC

2

CS

3

OD

TD

TI

TC

GND

9

10

13

12

15

14

UD4

R4

33K

R3

2K

VC3

BAT4

R2

2K

200

R1

UD2

VC2

BAT3

UD1

VCC

BAT1

VC1

BAT2

1K

R8

NSL

BATT+

FUSE

M2

M1

SSM4435M

SSM4435M

82nF

82nF

2.2nF

Protection Circuit for Four-Cell Lithium-Ion Battery Pack

12/29/2003 Rev.2.02