E-CMOS EC9523 Single cell lithium-ion/lithium-polymer battery protection ic Datasheet

Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
General Description
Features
The EC9523 Li-ion/Li-polymer battery protection IC has

high accuracy voltage detector and delay time circuit in
side.0 V charge function and self-recovery function

are available. The operating quiescent current is

very low. It is designed to protect 1-cell lithium-ion /

lithium polymer rechargeable batteries from damage
or degrading life time due to the overcharge,
over discharge and charge/discharge over current etc.





EC9523
Overcharge detection voltage 4.25 V to 4.35V,
Accuracy ±50 mV
Overcharge release voltage 4.05 V to 4.15V,
Accuracy ±50 mV
Overdischarge detection voltage 2.3 to 2.5V,
Accuracy 100 mV
Overdischarge release voltage 2.9 to 3.1V,
Accuracy ± 100 mV
Ultra-low operating current 2.5μA@Vcc=3.9V
Self-recovery function available
Overcurrent protection and load short protection
0V charge function available
Over charge current protection available
Applications

Single cell Lithium-ion/Lithium polymer
rechargeable battery pack.
Pin Configuration & Pin Function
Table 1: Pin definition and description for SOT23-6
No
Pin
Function
1
OD
Connection of charge MOSFET gate
2
CS
Pin for voltage and current detection
3
OC
Connection of discharge MOSFET gate
4
NC
No connection
5
VCC
Power supply
6
GND
Ground
E-CMOS Corp. (www.ecmos.com.tw)
Page 1 of 10
3J15N Rev. P001
Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
EC9523
Application Circuit
Components
R1
C1
R2
FET1 & FET2
Function
RC Filter
RC Filter
Limit transient current
NMOS
Discharge/Charge
control switch
Min
0.022
300
Typ
100
0.1
1K
Max
1K
1.0
2K
Unit
Ω
uF
Ω
Function Diagram
E-CMOS Corp. (www.ecmos.com.tw)
Page 2 of 10
3J15N Rev. P001
Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
EC9523
Ordering Information
Package
SOT23-6L
Part No
EC9523NNB3R
Part Number
Marking Information
Marking
9523
LLLL
EC9523NNB3R
LLLL:Lot No
Overcharge
detection
voltage
[VOCP] (V)
Overcharge
release
voltage
[VOCR] (V)
Overdischarge
detection
voltage
[VODP] (V)
Overdischarge
release
voltage
[VODR] (V)
Overcurrent
detection
voltage
[VOIP/VOI1]
(V)
Short
detection
voltage
[VSIP/VIO2]
(V)
4.3 +/- 0.05
4.1 +/- 0.05
2.4 +/- 0.1
3.0 +/- 0.1
0.15 +/0.03
0.85 +/- 0.3
Charge
overcurrent
detection
voltage
[VCOIP]
(V)
-0.10 +/0.05
Absolute Maximum Rating
Table 2
(Ta = +25°C unless otherwise specified)
Item
Symbol
Applied Pin
Absolute Maximum Rating
Unit
Input voltage between
VCC pin and GND pin
CS pin input voltage
VDS
VCC
VSS − 0.3 to VSS + 10
V
VCS
CS
VCC − 10 to VCC + 0.3
V
OC pin output voltage
VOC
OC
VCC − 10 to VCC + 0.3
V
OD pin output voltage
VOD
OD
VSS − 0.3 to VCC + 0.3 V
V
Operation ambient
temperature
Storage temperature
Topr
−40 to +85
°C
Tstg
−55 to +125
°C
E-CMOS Corp. (www.ecmos.com.tw)
Page 3 of 10
3J15N Rev. P001
Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
EC9523
Electrical Characteristics
TA = 25°C; unless otherwise specified.
Parameter
Test condition
Symbol
Current consumption
VCC=3.9 V
Current @ Powerdown
with self-recovery
VCC=2 V
Min
Typ
Max
Unit
Icc
2.5
6.0
uA
IPD
2
uA
Overcharge Protection
voltage
VOCP
4.25
4.30
4.35
V
Overcharge release
voltage
VODP
4.05
4.1
4.15
V
Overdischarge protection
voltage
VODP
2.3
2.4
2.5
V
Overdischarge release
voltage
VODR
2.9
3.0
3.1
V
Discharge overcurrent
detection voltage
VOIP (VOI1)
0.12
0.15
0.18
V
Charge overcurrent
detection voltage
VCOIP
-0.15
-0.10
-0.05
Short detection voltage
VSIP (VOI2)
0.55
0.85
1.15
0V-charge charger
voltage
V0CHA
1.2
Overcharge Protection
delay
TOC
100
200
ms
Overdischarge protection
delay
TOD
25
50
ms
Discharge overcurrent
delay
TOIP
12
25
ms
charge overcurrent delay
TCOIP
12
25
ms
Short delay time
TSIP
50
500
us
E-CMOS Corp. (www.ecmos.com.tw)
Page 4 of 10
V
V
V
3J15N Rev. P001
Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
EC9523
Description of operation
1.Overcharge protection
When the battery voltage becomes higher than VOCP and the detection continues for TOCP (overcharge protection delay
time) or longer, EC9523 turns the charging control MOSFET off to stop charging. This protection is called the overcharge protection.
The overcharge status is released in the following two cases.
(1) The voltage of battery is lower than VOCR (the release voltage of overcharge protection ) through self-discharge.
(2) The voltage of battery is lower than VOCP but higher than VOCR, if the load is connected, overcharge protection
status is also released.
When the voltage of battery is higher than VOCP, the overcharge protection will not be released even a load is connected
with the battery pack.
2.Overdischarge protection
When the battery voltage falls below overdischarge detection voltage (VODP) during discharging in the normal status and the
detection continues for the TODP (overdischarge protection delay time ) or longer, EC9523 turns the discharging control MOSFET off
to stop discharging. This condition is called the overdischarge protection. When the battery voltage is charged to over than
VODR (overdischarge release voltage) by charger, the overdischarge protection is released.
3.Overcurrent protection
When the battery discharge current is over than the specified current, the OD pin will be turn off to stop the discharge
operation. The discharge current is sensed by monitoring the voltage on the CS pin. Once the voltage on the CS pin is higher
than the VOIP( overcurrent protection voltage) and the detection continues for the TOIP(overcrrent protection delay time)
or longer, the MOSFET connected with the OD pin will be shutdown. The overcurrent protection returns to the normal
condition when the load is removed or the impendence between EB+and EB- is larger than 500 KΩ.
4.Charge Overcurrent protection
When the charge current provided by charger is over than the specified current, the OC pin will be turn off to stop charge operation.
The charge current is sensed by monitoring the voltage on the CS pin. Once the voltage on the CS pin is lower than the VCOIP
(charge overcurrent protection voltage) and the detection continues for TCOIP(charge overcurrent protection delay time),
the OC pin will become low to turn off the external MOSFET. When the voltage on the CS pin is higher than the
VCOIP, the charge overcurrent protection will be released.
E-CMOS Corp. (www.ecmos.com.tw)
Page 5 of 10
3J15N Rev. P001
Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
EC9523
5.0V battery charge function
This function is used to recharge a connected battery whose voltage is 0 V due to self-discharge. When
V0CHA (the 0 V battery charge starting charger voltage) or a higher voltage is applied between the EB+ and
EB− pins by connecting a charger, the charging control MOSFET gate is fixed to the VDD potential. When the
voltage between the gate and source of the charging control MOSFET becomes equal to or higher than the
threshold voltage due to the charger voltage, the charging control MOSFET is turned on to start charging. At
this time, the discharging control MOSFET is off and the charging current flows through the internal parasitic
diode in the discharging control MOSFET. When the battery voltage becomes higher than VODR, EC9523
enters the normal status.
6.Self-recovery function
EC9523 still operates even discharge protection occurred. Once the battery voltage returns to over than VODR ,the
discharge protection will be released and the IC (EC9523) will enter the normal status.
E-CMOS Corp. (www.ecmos.com.tw)
Page 6 of 10
3J15N Rev. P001
Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
EC9523
Timing Diagram
1. Overcharge protection
● TOC-overcharge delay time
E-CMOS Corp. (www.ecmos.com.tw)
Page 7 of 10
3J15N Rev. P001
Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
EC9523
2. Over discharge Protection
 TOD-overdischarge delay time
E-CMOS Corp. (www.ecmos.com.tw)
Page 8 of 10
3J15N Rev. P001
Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
EC9523
3.Overcharge Protection
 TOI1-over current protection delay time
 TOI2-short protection delay time
E-CMOS Corp. (www.ecmos.com.tw)
Page 9 of 10
3J15N Rev. P001
Single Cell Lithium-ion/Lithium-polymer
Battery Protection IC
EC9523
Package Outline
SOT23-6L
E-CMOS Corp. (www.ecmos.com.tw)
Page 10 of 10
3J15N Rev. P001
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