Protection IC for 1-Cell Battery Pack EC9528A DESCRIPTIONS The EC9528A series are the 1-cell protection IC for lithium-ion/lithium-polymer rechargeable battery pack. The high accuracy voltage detector and delay time circuits are built in EC9528A series with state-of-art design and process. To minimize power consumption, EC9528A series activates power down mode when an over-discharge event is detected (for power-down mode enabled version). Besides, EC9528A series performs protection functions with four external components for miniaturized PCB. The tiny package is especially suitable for compact portable device, i.e. slim mobile phone and Bluetooth earphone. FEATURE ■High Detection Accuracy - Over-charge Detection:±15mV - Over-discharge Detection: ±35mV - Discharge Over-current Detection: ±10mV - Charge Over-current Detection:±20mV ■ High Withstand Voltage - Absolute maximum ratings: 28V(V- pin and CO pin) ■ Ultra Small Package： SOT-23-5 SOT-23-6 DFN-1.6X1.6-6L SON-1.6X1.6-6L APPLICATION ■ Mobile phone battery packs ■ Digital camera battery packs ■ Bluetooth earphone Li-ion battery module E-CMOS Corp. (www.ecmos.com.tw) Page 1 of 22 4J03N-Rev.F002 EC9528A Protection IC for 1-Cell Battery Pack ORDERING INFORMATION EC9528A-XXX XX X R：Tape & Reel Version type B2：SOT23-5L B3：SOT23-6L F4：DFN 1.6*1.6 6L F5：SON 1.6*1.6 6L Part Number Package EC9528A-HQAB2R SOT23-5L EC9528A-XXXB3R SOT23-6L EC9528A-XXXF4R DFN 1.6*1.6 6L EC9528A-XXXF5R SON 1.6*1.6 6L Marking Marking Information BNXXX LLLL BNXXX LLLL BNXX LLLL BNXX LLLL 1. BN：Product code 2. XXX：Version code(see note 1) 3. LLLL：Lot No. 1. BN：Product code 2. XX： Version code(see note 1) 3. LLLL：Lot No. Note 1： ：Version code ( For marking) Version Code Version Code Version Code Version Code Version Code Version Code Version SOT-23-5 SOT-23-6 DFN-1.6X1.6-6L SON-1.6X1.6-6L HFA - HFA 10 10 HFB - HFB 11 11 HQA HQA HQA - 13 HQB HQB HQB - 14 HQC - HQC 12 12 NHA NHA NHA - 15 NHB NHB NHB - 16 Version Code E-CMOS Corp. (www.ecmos.com.tw) Page 2 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A Product version code: Table1: Detection threshold level table Discharg OverOverOverCharge Load e Overcharge discharg discharg overshortovercharge Hysteres e e current circuiting Detection current is detection release detection detection detection Voltage Voltage voltage voltage voltage voltage voltage VDET1 VHYS1 VDET2 VREL2 VDET4 VSHORT(V (V) VDET3 (V) (V) (V) (V) ) (V) Version Code Package Type 0V Battery Charge Function Delay Time Table 2 HFA B3/F4/F5 4.280 0.00 2.3 2.3 0.10 -0.1 0.5 Un-available (1) HFB B3/F4/F5 4.280 0.00 2.3 2.3 0.13 -0.1 0.5 Un-available (1) HQA B2/B3/F5 4.280 0.15 2.8 3.1 0.15 -0.1 0.5 Un-available (2) HQB B2/B3/F5 4.280 0.15 2.8 3.1 0.10 -0.1 0.5 Un-available (2) HQC B3/F4/F5 4.280 0.00 2.8 3.1 0.15 -0.1 0.5 Un-available (1) NHA B2/B3/F5 4.425 0.20 2.4 2.4 0.10 -0.1 0.5 Un-available (1) NHB B2/B3/F5 4.425 0.20 2.4 2.4 0.15 -0.1 0.5 Un-available (1) Note: *: (Please check detail at below description) For Overcharge release condition: When the battery voltage is lower than VDET1 – VHYS1 and the V- pin voltage is between charge overcurrent detection voltage (VDET4) and short detection voltage (VSHORT), the EC9528A series would release this condition. When the battery voltage is lower than VDET1 – VHYS1 and charger is removed, the EC9528A series can be released fromthis condition. Remark: Please contact our sales for the products with detection voltage value other than those specified above. Table2: Delay Time table Over-charge Delay time delay time (1) (2) tVDET1 (S) 1.0 +/- 20% 1.2 +/- 20% Over-discharge delay time tVDET2 (mS) 125 +/- 20% 150 +/- 20% Discharge over-current delay time tVDET3 (mS) 8.0 +/- 20% 9.0 +/- 20% Charge over-current delay time tVDET4 (mS) 8.0 +/- 20% 9.0 +/- 20% Load short-circuiting delay time tSHORT (uS) 400 +/- 20% 300 +/- 20% Remark Please contact our sales office for the products with detection voltage value other than those specified above. E-CMOS Corp. (www.ecmos.com.tw) Page 3 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A Package and Pin Description E-CMOS Corp. (www.ecmos.com.tw) Page 4 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A Typical Application Circuit Block Diagram E-CMOS Corp. (www.ecmos.com.tw) Page 5 of 22 4J03N-Rev.F002 EC9528A Protection IC for 1-Cell Battery Pack Absolute Maximum Ratings Symbol Descriptions Rating Units Supply Voltage -0.3 to 7 V VDD V- pin V VVDD - 28 to VDD + 0.3 CO pin V VDD -28 to VDD + 0.3 VCO Output Voltage DO pin V Vss - 0.3 to VDD + 0.3 VDO Operating Temperature Range -40 to +85 °C TOPT Storage Temperature Range -55 to +125 °C TSTG Applying any over “Absolute Maximum Ratings” practice can permanently damage the device. These data are indicated the absolute maximum values only but not implied any operating performance. Electrical Characteristics (For Li-ion) Symbo Item (Ta = 25℃) Conditions MIN TYP MAX Unit l Detection Voltage VDET1 Over-charge detection voltage -- VDET1-0.015 VDET1 VDET1+0.015 V VHYS1 Over-charge hysteresis voltage -- VHYS1-0.020 VHYS1 VHYS1+0.020 V VDET2 Over-discharge detection voltage -- VDET2-0.035 VDET2 VDET2+0.035 V VREL2 Over-discharge release voltage VDET2 ≠ VREL2 VREL2-0.050 VREL2 VREL2+0.050 V VDET2 = VREL2 VREL2-0.035 VREL2 VREL2+0.035 V VDET3+0.010 V VDET3 Discharge over-current detection voltage VDD=3.5V VDET3-0.010 VDET3 VDET4 Charge over-current detection VDD=3.5V -0.12 -0.10 -0.08 V VSHORT Load short-circuiting detection voltage VDD=3.5V 0.40 0.50 0.60 V Detection Delay Time 【Table 2 Delay time (1)】 tVDET1 Output delay time of over-charge - 0.8 1.0 1.2 s tVDET2 Output delay time of over-discharge - 100 125 150 ms VDD=3.5V 6.4 8.0 9.6 ms VDD=3.5V 6.4 8.0 9.6 ms VDD=3.5V 320 400 480 us tVDET3 tVDET4 tSHORT Output delay time of discharge over current Output delay time of charge over current Output delay time of Load short-circuiting detection Detection Delay Time 【Table 2 Delay time (2)】 tVDET1 Output delay time of over-charge - 0.96 1.2 1.44 s tVDET2 Output delay time of over-discharge - 120 150 180 ms VDD=3.5V 7.2 9.0 10.8 ms VDD=3.5V 7.2 9.0 10.8 ms VDD=3.5V 240 300 360 us tVDET3 tVDET4 tSHORT Output delay time of discharge over current Output delay time of charge over current Output delay time of Load short-circuiting detection E-CMOS Corp. (www.ecmos.com.tw) Page 6 of 22 4J03N-Rev.F002 EC9528A Protection IC for 1-Cell Battery Pack (Continued) Symbol Item Conditions MIN TYP MAX Unit 6.0 V 5.5 uA 0.1 uA Current Consumption (power-down function enabled) VDD Operating input voltage IDD Supply current ISTANDBY Power-down current (power-down function enabled IC only) VDD - VSS 2.0 VDD=3.5V, V-=0V 1.0 3.0 VDD=1.8V, V- floating 0V battery Charging Function V0CHA 0 V battery charge starting charger voltage V0INH 0V battery charge inhibition battery voltage 0 V battery charging function “available” 0 V battery charging function “unavailable” (Vcharger=4V~14V) 0.5 1.0 1.5 V 0.5 1.0 1.5 V Output Resistance RCOH CO pin H resistance VCO=3.0V, VDD=3.5V, V-=0V 1.25 2.50 5.00 KΩ RCOL CO pin L resistance VCO=0.5V, VDD=4.5V, V-=0V 0.75 1.50 3.00 KΩ RDOH DO pin H resistance 1.25 2.50 5.00 KΩ RDOL DO pin L resistance VDO=3.0V, VDD=3.5V, V-=0V VDO=0.5V, VDD=1.8V, V-=0V 1.75 3.50 7.00 KΩ VDD=1.8V, V-=0V 100 300 900 KΩ 50 100 300 KΩ V- internal Resistance RVMD RVMS Internal resistance between V- and VDD Internal resistance between V- and VSS E-CMOS Corp. (www.ecmos.com.tw) VDD=3.5V, V-=1.0V Page 7 of 22 4J03N-Rev.F002 EC9528A Protection IC for 1-Cell Battery Pack Electrical Characteristics(For Li-ion) Symbol Item (Ta = -10oC to +60oC)* Conditions MIN TYP MAX Unit Detection Voltage VDET1 Over-charge detection voltage -- VDET1-0.025 VDET1 VDET1+0.025 V VHYS1 Over-charge hysteresis voltage -- VHYS1-0.030 VHYS1 VHYS1+0.030 V VDET2 Over-discharge detection voltage -- VDET2-0.050 VDET2 VDET2+0.050 V VREL2 Over-discharge release voltage VDET2 ≠ VREL2 VREL2-0.080 VREL2 VREL2+0.080 V VDET2 = VREL2 VREL2-0.050 VREL2 VREL2+0.050 V VDD=3.5V VDET3-0.015 VDET3 VDET3+0.015 V VDET3 Discharge over-current detection voltage VDET4 Charge over-current detection VDD=3.5V -0.13 -0.10 -0.07 V VSHORT Load short-circuiting detection voltage VDD=3.5V 0.35 0.50 0.65 V Detection Delay Time 【Table 2 Delay time (1)】 tVDET1 Output delay time of over-charge - 0.7 1.0 1.3 s tVDET2 Output delay time of over-discharge - 88 125 163 ms VDD=3.5V 5.0 8.0 11.0 ms VDD=3.5V 5.0 8.0 11.0 ms VDD=3.5V 280 400 520 us tVDET3 tVDET4 tSHORT Output delay time of discharge over current Output delay time of charge over current Output delay time of Load short-circuiting detection Detection Delay Time 【Table 2 Delay time (2)】 tVDET1 Output delay time of over-charge - 0.84 1.2 1.56 s tVDET2 Output delay time of over-discharge - 105 150 195 ms VDD=3.5V 6.0 9.0 12.0 ms VDD=3.5V 6.0 9.0 12.0 ms VDD=3.5V 210 300 390 us tVDET3 tVDET4 tSHORT Output delay time of discharge over current Output delay time of charge over current Output delay time of Load short-circuiting detection E-CMOS Corp. (www.ecmos.com.tw) Page 8 of 22 4J03N-Rev.F002 EC9528A Protection IC for 1-Cell Battery Pack (Continued) Current Consumption (power-down function enabled) VDD Operating input voltage IDD Supply current ISTANDBY Power-down current (power-down function enabled IC only) VDD – VSS 2.0 VDD=3.5V, V-=0V 1.0 3.0 VDD=1.8V, V- floating 6.0 V 6.0 uA 0.1 uA 0V battery Charging Function V0CHA V0INH 0 V battery charge starting charger voltage 0V battery charge inhibition battery voltage 0 V battery charging function “available” 0 V battery charging function “unavailable” 0.3 1.0 1.7 V 0.3 1.0 1.7 V VCO=3.0V, VDD=3.5V, V-=0V VCO=0.5V, VDD=4.5V, V-=0V 1.00 2.50 5.00 KΩ 0.60 1.50 3.00 KΩ Output Resistance RCOH CO pin H resistance RCOL CO pin L resistance RDOH DO pin H resistance VDO=3.0V, VDD=3.5V, V-=0V 1.00 2.50 5.00 KΩ RDOL DO pin L resistance VDO=0.5V, VDD=1.8V, V-=0V 1.40 3.50 7.00 KΩ 78 300 900 KΩ 26 100 300 KΩ V- internal Resistance RVMD RVMS Internal resistance between V- and VDD Internal resistance between V- and VSS VDD=1.8V, V-=0V VDD=3.5V, V-=1.0V *: The specification for this temperature range is guaranteed by design because products are not screened at high to low temperature. E-CMOS Corp. (www.ecmos.com.tw) Page 9 of 22 4J03N-Rev.F002 EC9528A Protection IC for 1-Cell Battery Pack Test Circuits Over-charge, over-discharge and the release detection voltages (test circuit 1) 1) Set V1=3.5V, V2=0V, S1=ON and S2=OFF, then EC9528A series enters operating mode. 2) Increase V1 voltage (from 3.5V) gradually. The V1 voltage is the over-charge detection voltage (VDET1) when CO pin goes low (from high). 3) Decrease V1 gradually. The voltage gap is the over-charge hysteresis detection voltage (VHYS1) when CO pin goes high again. 4) Continue decreasing V1. The V1 voltage is the over-discharge detection voltage (VDET2) when DO pin goes low. Then increase V1gradually. The V1 voltage is the over-discharge release detection voltage (VREL2), when DO pin returns to high. Note: The over-charge and over-discharge release voltages are defined in versions. Discharge over-current detection voltage (test circuit 1) 1) Set V1=3.5V, V2=0V, S1=ON and S2=OFF and EC9528A series enters operating condition. 2) Increase V2 (from 0V) gradually. The V2 voltage is the discharge over-current detection voltage (VDET3) when DO pin goes low (from high). Charge over-current detection voltage (test circuit 1) 1) Set V1=3.5V, V3=0V, S1=OFF and S2=ON and EC9528A series enters operating condition. 2) Increase V3 gradually. The V3 voltage is the charge over-current detection voltage (VDET4) when CO pin goes low (from high). Load short-circuiting detection voltage (test circuit 1) 1) Set V1=3.5V, V2=0V, S1=ON and S2=OFF and EC9528A series enters operating condition. 2) Increase V2 immediately (within 10uS) till DO pin goes “low” from high with a delay time which is between the minimum and the maximum of Load short-circuiting delay time. Over-charge, over-discharge delay time (test circuit 1) 1) Set V1=3.5V, V2=0V, S1=ON and S2=OFF to enter operating condition. 2) Increase V1 from VDET1-0.2V to VDET1+0.2V immediately (within 10us). The over-charge detection delay time (tVDET1) is the period from the time V1 gets to VDET1+0.2V till CO pin switches from high to low. 3) Set V1=3.5V, V2=0V, S1=ON and S2 = OFF to enter operating condition. 4) Decrease V1 from VDET2+0.2V to VDET2-0.2V immediately (within 10us). The over-discharge detection delay time (tVDET2) is the period from the time V1 gets to VDET2-0.2V till DO pin switches from high to low. Discharge over-current delay time (test circuit 1) 1) Set V1=3.5V, V2=0V, S1=ON and S2=OFF to enter operating condition. 2) Increase V2 from 0V to 0.25V immediately (within 10us). The discharge over-current detection delay time (tVDET3) is the period from the time V2 gets to 0.25V till DO pin switches from high to low. Charge over-current delay time (test circuit 1) 1) Set V1=3.5V, V3=0V, S1=OFF and S2=ON to enter operating condition. 2) Increase V3 from 0V to 0.3V immediately (within 10us). The charge over-current detection delay time (tVDET4) is the period from the time V3 gets to 0.3V till CO pin gets to low from high. E-CMOS Corp. (www.ecmos.com.tw) Page 10 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A Load short-circuiting delay time (test circuit 1) 1) Set V1=3.5V, V2=0V, S1=ON and S2=OFF to enter operating condition. 2) Increase V2 from 0V to 1.0V immediately (within 10us). The Load short-circuiting detection voltage delay time (tSHORT) is the period from the time V2 gets to 1.0V till DO pin switches from high to low. Operating & power down current consumption (test circuit 2) 1) Set V1=3.5V, V2=0V and S1=ON to enter operating condition and measure the current I1. I1 is the operating condition current consumption (IDD). 2) Set V1=V2=1.8V and S1=ON enter over-discharge condition and measure current I1. I1 is the power down current consumption (ISTANDBY). Resistance between V- and VDD, V- and VSS (test circuit 2) 1) Set V1=1.8V, V2=0V and S1=ON and EC9528A series enters over-discharge condition. V1/I2 is the internal resistance between V- and VDD pin (RVMD). 2) Set V1=3.5V, V2=1.0V and S1=ON and EC9528A series enters discharge over-current condition. V2/I2 is the internal resistance between V- and VSS pin (RVMS). Output resistance (test circuit 3) 1) Set V1=3.5V, V2=0V, V3=3.0V, S1=OFF and S2=ON to enter operating condition. (V3-V1)/I2 is the internal resistance (RCOH). 2) Set V1=4.5V, V2=0V, V3 =0.5V, S1=OFF and S2=ON to enter over-charge condition. V3/I2 is the internal resistance (RCOL). 3) Set V1=3.5V, V2=0V, V3=3.0V, S1=ON and S2=OFF to enter operating condition. (V3-V1)/I2 is the internal resistance (RDOH). 4) Set V1=1.8 V, V2=0V, V3 =0.5V, S1=ON and S2=OFF to enter over-discharge condition. V3/I2 is the internal resistance (RDOL). 0V battery charge starting charger voltage (products with 0V battery charging function is “Available”) (test circuit 4) 1) Set V1=V2=0V, increase V2 gradually. 2) The V2 voltage is the 0V charge starting voltage (V0CHA) when CO pin switches from low to high (VV- + 0.1V or higher). 0V battery charge inhibition battery voltage (products with 0V battery charging function is “Unavailable”) (test circuit 4) 1) Set V1=1.6V, V2=-4V then decrease V1 gradually. 2) The V1 voltage is the 0V charge inhibition voltage (V0INH) when CO pin switches from low to high (VV- + 0.1V or higher). Note: The charger voltage should not be higher than 14V of 0V battery charge inhibition battery voltage. Shorten mode for overcharge and overdischarge functions by force voltage to Dout pin (test circuit 5) 1) Set V1=3.5V then NT1713 series enters operating mode. 2) Set V2= 0.5V, increase V1 voltage (from 3.5V) gradually. The V1 voltage is the over-charge detection voltage (VDET1) when CO pin goes low (from high). 3) Decrease V1 gradually. The voltage gap is the over-charge hysteresis detection voltage (VHYS1) when CO pin goes high again. 4) Continue decreasing V1. The V1 voltage is the over-discharge detection voltage (VDET2) when the voltage E-CMOS Corp. (www.ecmos.com.tw) Page 11 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A drop(VR1K*I1) on DO pin by shorten mode circuit. Then increase V1 gradually. The V1 voltage is the over-discharge release detection voltage (VREL2), when DO pin returns to high. Recommended: 1) '0 V charge available' doesn't means EC9528A series can recover the zero-V cell to be full charged if this cell has been already damaged due to too low voltage. 2) In EC9528A series, the '0 V charge inhibition' voltage is rather lower (0.5V). That is, EC9528A series allow charging such low voltage cell and recover it. 3) For safety consideration, we strongly recommended to select '0 V charge inhibition' to prevent from charging a damaged cell. E-CMOS Corp. (www.ecmos.com.tw) Page 12 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A Test Circuit E-CMOS Corp. (www.ecmos.com.tw) Page 13 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A Operation The EC9528A series provides over-charge, over-discharge, discharge over-current, charge over-current and load short-circuiting protections for the 1-cell battery pack. EC9528A series continuously monitors the voltage of battery between VDD pin and VSS pin to control over-charge and over-discharge protections. When the battery pack is in charging stage, the current flows from the charger to the battery through EB+ and EB-; the voltage between Vpin and VSS pin is negative. On the other hand, when the battery pack is in discharging stage, the current flows from battery to the load through EB+ and EB-; the voltage between V- pin and VSS pin is positive. The EC9528A series also monitors the voltage which is determined by the current of charge and discharge and the series Rds(on) of MOSFETs between V- pin and VSS pin to detect charge over-current and discharge over-current current conditions. (1) Normal Condition (Operation mode) The EC9528A series turns both the charging and discharging control MOSFETs on when the voltage of battery is in the range from over-charge detection voltage (VDET1) to over-discharge detection voltage (VDET2), and the VM pin voltage is in the range from over-current detection voltage (VDET4) to discharge over-current detection voltage (VDET3). This is called the normal condition that charging and discharging can be carried out freely. Caution: The EC9528A series may be needed connecting a charger to return to normal condition, when the battery is connected for the first time. (2) Over-charge Condition 1) Over-charge Protection: When the VDD voltage is higher than the over-charge detection voltage (VDET1) and lasts for longer than the overcharge detection delay time (tVDET1), EC9528A series turns off the external charging MOSFET to protect the pack from being over-charged, which CO pin turns to “L” from “H” level. 2) Over-charge Protection Release: When the battery voltage is lower than VDET1 - VHYS1 and the V- pin voltage is between charge over-current detection voltage (VDET4) and discharge over-current detection voltage (VDET3), the EC9528A series would be automatically released from this condition. When the battery voltage is lower than VDET1 and charger is removed, the EC9528A series can be automatically released from this condition. (3) Over-discharge Condition 1) Over-discharge Protection: When the VDD voltage is lower than the over-discharge detection voltage (VDET2) and lasts longer than overdischarge detection delay time (tVDET2), EC9528A series turns off the external discharge MOSFET to protect the pack from being over-discharged, which DO pin turns to “L” from “H” level. In over-discharge condition V- pin is pulled-up to VDD by a resistor (RVMD) between the V- pin and VDD pin. After that, when V- pin voltage is higher than VDD/2(Typ), the IC gets to power down mode. 2) Over-discharge Protection Release: The over-discharge protection is automatically released when (a) a charger is connected and V- pin voltage is lower than –0.7V (Typ.) and battery voltage is higher than the overdischarge voltage, or (b) a charger is connected, and V- pin voltage is higher than –0.7V (Typ.) and battery voltage is higher than the overdischarge release voltage. E-CMOS Corp. (www.ecmos.com.tw) Page 14 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A (4) Discharge Over-current Condition 1) Discharge Over-current Protection: The EC9528A series provides discharge over-current protection and load short-circuiting protection: (a) Discharge over-current protection occurs when V- pin voltage is between VDET3 and VSHORT and lasts for a certain delay time (tVDET3). (b) Load short-circuiting protection occurs when V- pin voltage is higher than VSHORT and lasts for a certain delay time (tSHORT). When above conditions happen, the DO pin goes “L” from ”H” to turn off the discharging MOSFET. In discharge over-current and load short-circuiting conditions, V- pin is pulled-down to VSS pin by the internal resistor (RVMS). 2) Discharge Over-current and Load Short-Circuiting Protection Release: The IC detects the status by monitoring V- pin voltage that is inversely proportional to the impedance (Rload) between two terminals (EB+ and EB-). The Rload increases while the V- pin voltage decreases. When the V- pin voltage equals to VSHORT or lower, discharge over-current status returns to normal mode and the circuit will be automatic recovery. The relation between V- and Rload is shown as follows: (5) Charge Over-current Condition The EC9528A series provides charge over-current protection to prevent the battery pack from being connected to an unexpected charger. 1) Charge Over-current Protection When the voltage of V- pin is lower than charge over-current detection voltage (VDET4) and lasts for a certain delay time (tDET4) or longer, the CO pin goes “L” from ”H” to turn off the charging MOSFET. 2) Charge Over-current Release: Charge over-current protection can be automatically released by disconnecting the charger. (6) Power Down Condition 1) Entering to Power Down Mode: EC9528A series enters the power down mode when over-discharge protection occurs and V- pin voltage is higher than VDD/2 (typical). The V- pin voltage is pulled-up to the VDD through the RVMD resistor. The internal circuits is shut off, therefore, the power-down current (ISTANDBY) is reduced to be low 0.1uA (Max.). 2) Power Down Mode Release: The power down mode is automatically released when a charger is connected and V- pin voltage is lower than VDD/2 (typical). Note: Power down condition is for power down mode enabled version only. Remark: Neotec provides the test mode on the DO pin by Vdd+0.5V, to reduce over-charge and over-discharge delay time. E-CMOS Corp. (www.ecmos.com.tw) Page 15 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A Timing Chart (1) Over-charge, Charge Over-current Operation (a) Normal condition (b) Over-charge condition *: The charger is assumed to charge with a constant current. E-CMOS Corp. (www.ecmos.com.tw) Page 16 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A (2) Over-discharge, Discharge Over-current, Load Short-Circuiting Operation (a) Normal condition (b) Over-discharge condition (c) Discharge over-current condition (d) Load short-circuit condition *: The charger is assumed to charge with a constant current. E-CMOS Corp. (www.ecmos.com.tw) Page 17 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A Recommended Application Circuit Table1 Constant for external components E-CMOS Corp. (www.ecmos.com.tw) Page 18 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A *1) If the threshold voltage of FET is lower than 0.4V, the FET may failed to stop the charging current. If the FET has a threshold voltage equal to or higher than the over-discharge detection voltage, discharging may be stopped before over-discharge is detected. If the charger voltage is higher than the withstanding voltage between the gate and source, the FET may be damaged. *2) Employing an over-specification (listed in above table) R1 may result in over-charge detection voltage and release voltage higher than the defined voltage If R1 has a higher resistance, the IC may be damaged caused by over absolute maximum rating of VDD voltage when a charger is connected reversely. *3) Applying a smaller capacitance C1 to system, DO may failed to function when load short-circuiting is detected. *4) R1 and R2 resistors are current limit resistance for a charger connected reversibly or a large voltage charger that exceeds the absolute rating for VCC is connected, when we connect reverse charger the current flows from charger to R2, internal ESD diode and R1. This current will increase R1 voltage drop. Which can exceed VCC(max). In this case better to use smaller value for R1 and bigger value for R2. But small value of R1 will reduce R-C filter performance and system ESD reliability. Too big value of R2 can cause over-current automatic release problem.If R2 resistance is higher than 2kΩ, the charging current may not be cut when a high-voltage charger is connected. *5) As followed this recommended table, the system ESD level could be reached at least ±12KV. We can improve system ESD by connect C2 ~ C5 capacitor of 0.1uF. Both C2 and C3 are protected MOSFET from being assaulted by system ESD. C4 and C5 are improved system ESD and reduce imported noise by load. Caution: 1) The above constants may be changed without notice. 2) The application circuit above is for reference only. To determine the correct constants, evaluation of actual application is required. Precautions: 1) The application condition for the input voltage, output voltage, and load current should not exceed the package power dissipation. 2) Do not apply an electrostatic discharge to this IC that exceeds the performance ratings of the built-in electrostatic protection circuit. E-CMOS Corp. (www.ecmos.com.tw) Page 19 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack EC9528A Package Information E-CMOS Corp. (www.ecmos.com.tw) Page 20 of 22 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack E-CMOS Corp. (www.ecmos.com.tw) Page 21 of 22 EC9528A 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack E-CMOS Corp. (www.ecmos.com.tw) Page 22 of 22 EC9528A 4J03N-Rev.F002 Protection IC for 1-Cell Battery Pack E-CMOS Corp. (www.ecmos.com.tw) Page 23 of 22 EC9528A 4J03N-Rev.F002