1998 Jan 15

2

Philips Semiconductors

Preliminary specification

Safety IC for Li-ion

SAA1502ATS

FEATURES

• Integrated power switches

• Temperature protection

• Zero voltage start-up

• Discharge and charge overcurrent protection

• Automatic release of current protection at removal of

charger or load

• Extremely low current consumption when battery

voltage is lower than 2.3 V

• Low current consumption in normal operation mode

• Accurate voltage detection levels

• Low resistance in current path

• Able to accommodate 17.5 V charge voltage

• Read out of charge disable status

• Small package (SSOP16)

• Low external components count

• Continuous monitoring of the battery voltage and

(dis)charge current.

GENERAL DESCRIPTION

The SAA1502ATS is manufactured in a Bipolar, CMOS

and DMOS (BCD) Power Logic 70 process and is intended

to be used as a protection circuit for single cell Li-ion

battery packs. The current and voltage ratings are

especially designed for use in battery packs for portable

telephones such as GSM.

The circuit monitors the battery voltage, current and

temperature and will disconnect the battery in case of an

overload situation:

• Overdischarge protection prevents deep discharge of

the cell; deep discharge of a Li-ion cell degrades the

lifetime

• Overcharge protection for safety reasons

• Overcurrent protection on charge as well as discharge

current rate

• Temperature protection for preventing charge or

discharge at high temperatures.

It must be stated that the unit is a safety unit to be

integrated inside a battery pack. It is not intended as an

end of charge provision.

ORDERING INFORMATION

TYPE

NUMBER

PACKAGE

NAME

DESCRIPTION

VERSION

SAA1502ATS

SSOP16

plastic shrink small outline package; 16 leads; body width 5.3 mm

SOT338-1