TS2207A/B
Li-Ion Battery Protector
Pin assignment
1. D
OUT
2. V
-
3. C
OUT
4. C
EXT
5. V
DD
6. V
SS
Ideal for One-Cell Rechargeable
Li-Ion Battery
General Description
The TS2207A/B series are protection ICs design to safe guard one-cell Lithium-ion battery pack against over
charge/discharge, over current and short circuit. The TS2207A/B series use advanced high voltage CMOS process to
provide high accuracy voltage detection and low current consumption.
The TS2207A/B series incorporate a reference unit and three voltage detectors. During charging process, when the cell
voltage(V
DD
) is charged to a value higher than the over-charge threshold voltage (V
C1
), the over charge detector (COM1)
will switch the output pin (C
OUT
) to a low level within a delay time (t
C1
), and thus turning off the MOSFET connected to the
charging path. The C
OUT
pin may change to high level again when the V
DD
voltage falls below 鈥淰
C1
-V
HYS
鈥? or when V
DD
falls below V
C1
while the charger is disconnected from the battery pack.
During the discharging process, when the V
DD
voltage drops to a value lower than the over-discharge threshold voltage
(V
D1
), the over-discharge detector (COM2) will switch D
OUT
to low level within a delay time (t
D1
), and thus turning off the
MOSFET connecting the discharging path. In the mean time, the TS2207A/B series will enter a low current standby
mode. Once into standby mode, the system can only be released from standby mode right after the battery pack is
connected to a charger.
The conditions of over current and short circuit protection are both determined by the voltage at the V- pin. As the voltage
of V- pin reaches a higher value than V
OC
, which indicates an undesirable large current is flowing through the path, D
OUT
will be switched to a low level and the path is cutoff after internally pre-set delay time (t
OC
) elapses. In the case of short
circuit, i.e. V- rises above V
SHORT
, the path will also be cutoff but with almost no delay time. Once the over current or
factors contributing to short circuit is removed, the built-in resistor at the V- pin, typically 100k鈩? will pull V- down to V
SS
and bringing the IC back to normal operation.
Together with the application circuit, the TS2207A/B will function as a consummate protector, which promotes safe usage
and the sustainability of Li-ion battery packs.
Features
Low current consumption
Supply current 3uA (typ) and standby current 0.6uA
High withstand voltage up to 22V (VDD ~ V-)
High accuracy voltage detection
Over charge detector: 鹵 50mV
Over discharge detector: 鹵 3.2%
Over current and short circuit protection
Small package of SOT-26
Ordering Information
Part No.
TS2207ACX6
TS2207BCX6
Note: Marking BXX,
XX
is wafer and assembly lot code (A~Z & 1~9)
Threshold Voltage
4.30V ~ 4.40V
4.23V ~ 4.33V
Reel
Black
White
Pin Description
No.
1
2
3
4
5
6
Symbol
D
OUT
V
-
C
OUT
C
EXT
Description
Output of over discharge detection
Pin for charger negative input
Output of over charge detection
Pin for external capacitor Setting
COM1 delay time
Power supply
Ground
Applications
Over-charge and over-discharge protection for Li-ion
cell pack
High precision protectors for cell-phones and other
gadget using on board Li-ion cell battery
V
DD
V
SS
TS2207A/B series
1-6
2003/12 rev. B
1
2
3
4
5
6
