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SS6821

Single-Cell Lithium-Ion Battery Protection IC

FEATURES

Reduction in board size with miniature SOT-23-5

package and few external components.

Ultra-low quiescent current of 7

Ultra-low power-down current of 0.6

Precision over-charge protection voltage

4.35V

± 50mV for the SS6821A

4.30V

± 50mV for the SS6821B

4.25V

± 50mV for the SS6821C

4.20V

± 50mV for the SS6821D

Built-in delay-time circuits for over-charge, over-

discharge, and over-current protection.

Load detection function during overcharge mode.

Two detection levels for over-current protection.

APPLICATIONS

Protection IC for single-cell Lithium-Ion battery

packs.

DESCRIPTION

The

SS6821

battery

protection

IC

is

designed to protect a lithium-ion battery from

damage or reduced lifetime due to over-charge,

over-discharge, and/or over-current in single-cell

lithium-ion battery powered systems, such as

cellular phones. The ultra-small package and

few external components make the SS6821

ideal for integration into the limited space of

of a battery pack.

The accurate

±50mV over-charging detection

voltage

ensures

safe

and

full-utilization

charging. Four different specification values for

over-charge protection voltage are provided for

various protection requirements. The very low

standby current drains little current from the cell

while in storage.

TYPICAL APPLICATION CIRCUIT

BATT-

BATT+

100K

5

4

3

2

1

R2

R3

FUSE

C1

0.1

µF

R1

100

10M

M2 SSM9926

M1

SSM9926

OC

CS

OD

GND

VCC

SS6821

Protection Circuit for Single-Cell Lithium-Ion Battery

12/6/2004 Rev.2.02