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