
2000 Mar 07
2
Philips Semiconductors
Objective specification
Safety IC
SAA1504T
FEATURES
 Zero voltage start-up
 Discharge and charge overcurrent protection
 Automatic release of current protection at removal of
charger or load
 Low current consumption in normal operating mode
 Very low current consumption when battery voltage is
lower than 2.3 V
 Accurate voltage detection levels
 Continuous monitoring of battery voltage and charge or
discharge current
 External power FETs are driven with an elevated supply
voltage, reducing the on-resistance
 Able to accommodate 20 V charge voltage
 Read out of charge (disable) status
 Small package (SO8)
 Low external components count
 Temperature protection
 Charger reverse connection protection.
GENERAL DESCRIPTION
The SAA1504T is manufactured in a 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 continuously monitors the battery voltage,
current and junction 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 life
cycle
 Overcharge protection for safety reasons
 Overcurrent protection on charge or discharge current
rate
 Temperature protection for preventing charge or
discharge at high temperatures
 Short circuit protection.
It must be stated that this is a safety IC to be integrated
inside a battery pack. It is not primarily intended as an end
of charge provision.
ORDERING INFORMATION
TYPE
NUMBER
PACKAGE
NAME
DESCRIPTION
VERSION
SAA1504T
SO8
plastic small outline package; 8 leads; body width 3.9 mm
SOT96-1