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TS2208 Datasheet, PDF (1/6 Pages) Taiwan Semiconductor Company, Ltd – Li-Ion Battery Protector | |||
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TS2208A/B
Li-Ion Battery Protector
Pin assignment
1. DOUT
2. V-
3. COUT
4. CEXT
5. VDD
6. VSS
Ideal for One-Cell Rechargeable
Li-Ion Battery
General Description
The TS2208A/B series are over-charge/discharge protection ICs for rechargeable one-cell Lithium-ion batteries. They
bear an over-charge/over-discharge threshold for the battery cell voltage during charging/discharging process, and also
provide on-time protection when excess current or short circuit occurs.
The TS2208A/B series are essentially composed of a reference unit and three voltage detectors. During charging
process, when the cell voltage/VDD crosses the over-charge threshold voltage VC1, the over charge detector (COM1) will
switch the output pin (COUT) to a low level within a delay time (tC1), and thus turning off the MOSFET connected to the
charging path. The COUT pin may change to high level again when the VDD voltage falls below âVC1-VHYSâ, or when VDD
falls below VC1 while the charger is disconnected from the battery pack.
During the discharging process, when the VDD voltage crosses the over-discharge threshold voltage (VD1), the
over-discharge detector (COM2) will switch DOUT to low level within a delay time (tD1), and thus turning off the MOSFET
connecting the discharging path. In the mean time, the TS2208A/B series will enter a low current standby mode. Once
into standby mode, it can only be released from standby after the battery pack is connected to a charger.
The conditions of excess current and short circuit protection are both determined according to the voltage at the V- pin.
As the voltage of V- pin reaches a greater value than VOC, which means an undesirable large current is flowing through
the path, DOUT will be switched to a low level and the path is cutoff after internally pre-set delay time (tOC) elapses. In the
case of short circuit, i.e. V- rises above VSHORT, the path will also be cutoff but with almost no delay time. Once the excess
current or short circuit fault is removed, the built-in resistor at the V- pin, typically 100kohm, will pull V- down to VSS and
bringing the IC back to normal operation.
Together with the application circuit, the TS2208A/B will function as a consummate protector for Li-ion battery packs
which leads to safety and long lifetime.
Features
Ordering Information
 Low current consumption
Part No. Threshold Voltage
Reel
Supply current 3uA (typ) and standby current 0.1uA
 High withstand voltage up to 22V (VDD ~ V-)
 High accuracy voltage detection
 Over charge detector
 Over discharge detector
 Over current and short circuit protection
 Small package of SOT-26
Applications
TS2208ACX6
4.33V ~ 4.37V
Black
TS2208BCX6
4.26V ~ 4.30V
White
Note: Marking BXX,
XX is wafer and assembly lot code (A~Z and 1~9)
Pin Description
No. Symbol
Description
1
DOUT Output of over discharge detection
2
V- Pin for charger negative input
 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
3
COUT Output of over charge detection
4
CEXT Pin for external capacitor Setting
COM1 delay time
5
VDD Power supply
6
VSS Ground
TS2208A/B series
1-6
2003/12 rev. B
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