Philips Semiconductors
Safety IC for Li-ion
Preliminary specification
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
SAA1502ATS
PACKAGE
NAME
DESCRIPTION
SSOP16 plastic shrink small outline package; 16 leads; body width 5.3 mm
VERSION
SOT338-1
1998 Jan 15
2