Features: · Low current consumption 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-26Application· 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 batterySpecifications
| Supply Voltage |
VDD |
-0.3 to 12 |
V |
| Input Voltage |
V- pin |
V- |
VDD-22 to VDD +0.3 |
V |
| VCT pin |
VCext |
VDD-0.3 to VDD +0.3 |
V |
| Output Voltage |
COUT pin |
VCOUT |
VDD-22 to VDD +0.3 |
V |
| DOUT pin |
VDOUT |
VDD-0.3 to VDD +0.3 |
V |
| Power Dissipation |
PD |
150 |
mW |
| Operating Temperature Range |
TOPT |
-40 to +85 |
|
| Storage Temperature Range |
TSTG |
-50 to +120 |
|
Note:
Absolute Maximum ratings are threshold limit values that must not be exceeded even for an instant under any conditions. Operation above these absolute maximum ratings may cause degradation or permanent damage to the device. These are stress ratings only and do not necessarily functional operation below these limits.
DescriptionThe 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 "VC1-VHYS", 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 OSFET 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- in.
As the voltage of V- pin reaches a greater value than VOC, which means an undesirable large current is flowing hrough 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 of the TS2208A, 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 nd bringing the IC back to normal operation.
Together with the application circuit, the TS2208A will function as a consummate protector for Li-ion battery packs which leads to safety and long lifetime.
TS2208A Data Sheet
