EC9523 E-CMOS | Alldatasheet

Document overview

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Technical content

Features

 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

Single Cell Lithium-ion/Lithium-polymer Battery Protection IC EC9523 Function Diagram Components Function Min Typ Max Unit R1 RC Filter 100 1K Ω C1 RC Filter 0.022 0.1 1.0 uF R2 Limit transient current 300 1K 2K Ω FET1 & FET2 NMOS Discharge/Charge control switch Application Circuit

Single Cell Lithium-ion/Lithium-polymer Battery Protection IC EC9523

Ordering Information

(Ta = +25°C unless otherwise specified) Package Part Number Marking Marking Information SOT23-6L EC9523NNB3R 9523 LLLL LLLL：Lot No Part 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) Charge overcurrent detection voltage [VCOIP] (V) EC9523NNB3R 0.03 0.05 Item Symbol Applied Pin Absolute Maximum Rating Unit Input voltage between VCC pin and GND pin VDS VCC VSS − 0.3 to VSS + 10 V CS pin input voltage 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 Topr −40 to +85 °C Storage temperature Tstg −55 to +125 °C

Single Cell Lithium-ion/Lithium-polymer Battery Protection IC EC9523

Electrical Characteristics

TA = 25°C; unless otherwise specified. Parameter Test condition Symbol Min Typ Max Unit Current consumption VCC=3.9 V Icc 2.5 6.0 uA Current @ Powerdown with self-recovery VCC=2 V 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 V Short detection voltage VSIP (VOI2) 0.55 0.85 1.15 V 0V-charge charger voltage V0CHA 1.2 V 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

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.

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.

Single Cell Lithium-ion/Lithium-polymer Battery Protection IC EC9523 Timing Diagram 1. Overcharge protection

  • TOC-overcharge delay time

Single Cell Lithium-ion/Lithium-polymer Battery Protection IC EC9523 2. Over discharge Protection  TOD-overdischarge delay time

Single Cell Lithium-ion/Lithium-polymer Battery Protection IC EC9523 3.Overcharge Protection  TOI1-over current protection delay time  TOI2-short protection delay time

Single Cell Lithium-ion/Lithium-polymer Battery Protection IC EC9523 Package Outline SOT23-6L