TS2207AB [TSC]
Li-Ion Battery Protector Ideal for One-Cell Rechargeable Li-Ion Battery; 锂离子电池保护器适合于单节可充电锂离子电池
| 型号： | TS2207AB |
| 厂家： | 
TAIWAN SEMICONDUCTOR COMPANY, LTD |
| 描述： | Li-Ion Battery Protector Ideal for One-Cell Rechargeable Li-Ion Battery |
| 文件： | 总6页 (文件大小：153K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
TS2207A/B
Li-Ion Battery Protector
Pin assignment
1. DOUT
2. V-
3. COUT
4. CEXT
5. VDD
Ideal for One-Cell Rechargeable
Li-Ion Battery
6. VSS
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(VDD) is charged to a value higher than 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 drops to a value lower than 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 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 VOC, which indicates 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 over current or
factors contributing to short circuit is removed, the built-in resistor at the V- pin, typically 100kΩ, will pull V- down to VSS
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
Ordering Information
Part No.
Threshold Voltage
Reel
Black
White
Low current consumption
TS2207ACX6
4.30V ~ 4.40V
4.23V ~ 4.33V
Supply current 3uA (typ) and standby current 0.6uA
High withstand voltage up to 22V (VDD ~ V-)
High accuracy voltage detection
TS2207BCX6
Note: Marking BXX,
XX is wafer and assembly lot code (A~Z & 1~9)
Over charge detector: ± 50mV
Pin Description
Over discharge detector: ± 3.2%
Over current and short circuit protection
Small package of SOT-26
No. Symbol
DOUT
V-
Description
Output of over discharge detection
Pin for charger negative input
Output of over charge detection
Pin for external capacitor Setting
COM1 delay time
1
Applications
2
3
4
COUT
CEXT
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
5
6
VDD
VSS
Power supply
Ground
TS2207A/B series
1-6
2003/12 rev. B
Block Diagram
Typical Application
TS2207A/B series
2-6
2003/12 rev. B
Absolute Maximum Rating
Supply Voltage
VDD
V-
-0.3 to 12
VDD-22 to VDD +0.3
VSS -0.3 to VDD +0.3
VDD-22 to VDD +0.3
VSS -0.3 to VDD +0.3
150
V
V
V- pin
CT pin
COUT pin
OUT pin
Input Voltage
V
VCext
VCOUT
VDOUT
PD
V
V
Output Voltage
D
V
Power Dissipation
mW
oC
oC
Operating Temperature Range
Storage Temperature Range
Note:
TOPT
TSTG
-40 to +85
-50 to +120
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.
Electrical Characteristics (Ta = 25 oC, unless otherwise specified.)
Parameter
Conditions
Symbol
Min
Typ
Max
Unit
Operating input voltage
Voltage defined as VDD-VSS
VDD1
1.5
--
10
V
Detect rising
TS2207A
4.30
4.23
4.35
4.28
4.40
4.33
Over-charge threshold voltage
edge of supply
VC1
V
TS2207B
voltage
Over-charge threshold hysteresis
range
VHYS
0.15
40
0.20
75
0.25
145
V
C3= 0.01µF,
Over-charge delay time
tC1
ms
VDD = 3.6V to 4.4V
Detect falling edge of supply
voltage
Over-discharge threshold voltage
Over-discharge delay time
VD1
tD1
2.42
4
2.500
10
2.58
20
V
ms
V
VDD= 3.6V to 2.4V
Detect rising edge of “V-” pin
voltage
Over current detection voltage
VOC
0.17
0.20
0.23
Over current detection delay time VDD= 3.0V
tOC
6
VDD-1.2
--
13
VDD-0.9
5
35
VDD-0.6
50
ms
V
Short circuit detection voltage
Short circuit detection delay time
Reset resistance for excess
current protection
VDD= 3.0V
VDD= 3.0V
Vshort
tshort
µS
VDD= 3.6V,V-=1.0V
Rshort
50
100
150
KΩ
Nch ON voltage of COUT
Pch ON voltage of COUT
Nch ON voltage of COUT
Pch ON voltage of COUT
Supply current
IOL = 50µA, VDD= 4.4V
IOH = -50µA, VDD= 3.9V
IOH = 50µA, VDD= 2.4V
IOH= -50µA, VDD= 3.9V
VDD= 3.9V,V-= 0V
VDD= 2.0V
VOL1
VOH1
VOL2
VOH2
IDD
--
3.4
--
0.3
3.8
0.2
3.7
3
0.5
--
V
V
0.5
--
V
3.4
--
V
7
µA
µA
Standby current
Istandby
--
--
0.6
TS2207A/B series
3-6
2003/12 rev. B
Operation Description
COM1 (Over-Charge Detector)
COM1 is the monitor of the voltage at the VDD pin. COM1 senses an over charging condition and if this condition
continues longer than the delay time (tC1), When the voltage at VDD exceeds the over charge detector threshold VC1
.
the COUT pin goes to a “L” level thus turns off the external charge control N-ch MOSFET. An internal level shifter is
incorporated in the buffer driver at the COUT pin to drive the “L” level of COUT equal to the V- pin voltage. By the way,
the “H” level of COUT is set equal to VDD
.
The delay time (tC1) of over-charging is decided by the external capacitor C3 connected between the Vss and Cext pin,
it can be estimated as tC1 = [C3 x (VDD-0.7)] / (0.48 x 10-6). However, if the over-charge condition is not long enough
to cover the time delay window, COUT will not go “L” and the charging process continues.
Required Conditions to Reset COM1 from Over Charging
After the MOSFET, the charge control is turns off, COM1 can be reset under two conditions. As resetting COM1
means COUT returns to “H” again and the charging path is reconnected to restart of charging process. One of the
condition to reset COM1 is when VDD falls to lower than “VC1 - VHYS” as a result of battery cell internal discharge.
Disconnecting the battery pack from the charger can also reset COM1 even when VDD is still within the hysteresis
window (VC1 - VHYS ≤VDD < VC1).
After the battery pack is disconnected from the charger, connecting a system load to the battery pack allows current to
flow through the parasitic diode of external charge control MOSFET. This discharging current will bring VDD down a
little over some time and once VDD drops below VC1, COUT will become “H”.
COM2 (Over-Discharge Detector)
COM2 monitors the cell voltage at the VDD pin. When VDD drops below the over-discharge threshold VD2 during the
discharging process, COM1 senses an over-charging condition and after delay time (tD1), the DOUT pin goes to a “L”
level and thus turning off the external discharge control N-ch MOSFET. As soon as this happens, the V- pin will be
pulled “H” by an internal PMOS and TS2207A/B series will be enter a standby mode.
Connecting the battery pack to a charger is a necessary condition for TS2207A/B series to recover from standby
mode. With the charger connected, the charge current can flow through the parasitic diode of the external discharge
control N-ch MOSFET while VDD is still lower than the over-discharge threshold. Once VDD is charged up to a value
higher than VD1, the DOUT pin goes “H”. This leads to the “ON” state of both the charge and discharge control
MOSFETs, and the charge process proceeds on as long as the charger is connected. Connecting a charger to the
battery pack when VDD voltage is already higher then VD1 will make DOUT instantaneously “H”.
COM3 (Over Current Detector, Short Circuit Protector)
The over current detector and short circuit protector can work when both the charge and discharge control N-ch
MOSFETs are “ON”.
Under normal operation, the V- pin voltage will be either slightly higher or lower than Vss (dependent on the
impedance of the two MOSFETs). However, when the V- pin voltage rises to a value between the short protection
voltage Vshort and over current threshold VOC, the TS2207A/B series detect an excess current condition. As a result,
the external discharge control N-ch MOSFET goes “OFF” with the DOUT pin being at “L”. An output delay time for the
over current detection is internally fixed. A quick recovery of V- from a value between Vshort and VOC to the normal
value within the delay time keeps the discharge control FET staying at the “ON” state.
Short circuit may as well be explained as a “serious” over current condition. When the V- pin voltage rises to a value
not only higher than VOC but also higher than Vshort, the short circuit protector will shut the discharge MOSFET down
immediately to protect battery pack from being damaged or exploding.
The V- pin has a built-in pull down resistor. Thus once the cause of over current or short circuit is removed, the V- pin
will be pulled down to the ground level through the internal resistor. Therefore, with V- lower than the over current and
short circuit protection threshold, DOUT will be turned back on and the TS2207A/B series can continue normal charge
or discharge operation.
When over current or short circuit occurs, the TS2207A/B series will not enter a standby mode.
TS2207A/B series
4-6
2003/12 rev. B
Timing Diagram
TS2207A/B series
5-6
2003/12 rev. B
SOT-26 Mechanical Drawing
SOT-26 DIMENSION
MILLIMETERS
INCHES
DIM
MIN
2.70
0.25
MAX
3.00
0.50
MIN
MAX
0.118
0.020
A
B
C
D
E
F
H
L
0.106
0.010
1.90(typ)
0.95(typ)
1.50
0.075(typ)
0.037(typ)
1.70
1.35
3.00
0.059
0.067
0.053
0.118
1.05
2.60
0.041
0.102
0.60(typ)
0.024(typ)
TS2207A/B series
6-6
2003/12 rev. B
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