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1996 Feb 26 2
Philips Semiconductors Objective specification
Cost effective battery monitor and fast
charge IC for NiCd and NiMH chargers
TEA1104; TEA1104T
FEATURES
• Accurate detection of fully charged batteries by
currentless peak voltage sensing
• Switch-over from fast to safe trickle charge current at
battery full detection
• Fast charge termination back-up by maximum time and
maximum temperature detection
• Several trickle charge drive possibilities for mains
isolated and non-mains isolated systems
• Battery checking to protect against short-circuited and
open batteries
• Battery monitor allows recharging of different battery
packs in the same charger
• Dual LED indicator provision
• External regulator not required because of large input
voltage range
• Few low cost external components required.
APPLICATIONS
• Portable telephone
• Portable computer
• Portable audio
• Portable video.
GENERAL DESCRIPTION
The TEA1104 is manufactured in a BiCMOS process
intended to be used as a battery monitor circuit in charge
systems for NiCd and NiMH batteries. It is especially
designed for cost effective compact consumer
applications.
The circuit is able to detect fully charged batteries by
currentless battery voltage sensing. Several output drive
functions are available to control the (reduced) trickle
charge current to keep the batteries full with maximum life
expectations.
The battery full detection is backed up by two independent
mechanisms to make the system fail safe; maximum time
and maximum temperature.
QUICK REFERENCE DATA
ORDERING INFORMATION
SYMBOL PARAMETER CONDITIONS MIN. TYP. MAX. UNIT
V
P
supply voltage 5.45 − 11.5 V
I
P
supply current outputs off −−3mA
V
bat
voltage range of battery full detection 0.81 − 3.6 V
∆V
bat
/V
bat
voltage peak detection level with
respect to top value
− 0.25 − %
I
bat
battery monitor input current −−1nA
V
bat(l)
battery voltage protection low − 0.81 0.91 V
V
bat(h)
battery voltage protection high 3.5 3.6 − V
f
osc
oscillator frequency 10 − 100 kHz
TYPE
NUMBER
PACKAGE
NAME DESCRIPTION VERSION
TEA1104 DIP8 plastic dual in-line package; 8 leads (300 mil) SOT97-1
TEA1104T SO8 plastic small outline package; 8 leads; body width 3.9 mm SOT96-1