unisonic technologies co., ltd ub211c preliminary cmos ic www.unisonic.com.tw 1 of 10 copyright ? 2011 unisonic technologies co., ltd qw-r502-482.b 1-cell lithium-ion/polymer battery protection ic ? description utc ub211c is a series of lithium-ion / lithium-polymer rechargeable battery protection ics incorporating high accuracy voltage detection circuits and delay circuits. utc ub211c is suitable for protection of single cell lithium-ion / lithium polymer battery packs from overcharge, over discharge and over current. the ultra-small package and less requirement of external components make it ideal to integrate the utc ub211c into the limited space of battery pack. ? features * wide supply voltage range: v dd =1.5v~8.0v * ultra-low quiescent current: i ope =3.0 a (v dd =3.5v) * ultra-low power-down current: i pdn =0.2 a (v dd =1.5v) * overcharge detection voltage: v cu =3.9v~4.4v * overcharge release voltage: v cl =3.8v~4.4v * over discharge release voltage: v dl =2.0v~3.0v * over discharge release voltage: v du =2.0v~3.4v * discharge over current detection voltage: v doiv =0.05v~0.30v * discharge short circuit detection voltage: v short =0.5v (fixed) * charge over current voltage: v coiv =-0.1v (fixed) * charger detection voltage: v cha =-0.7v (fixed) * delay times are generated by an internal cir cuit. (external capacitors are unnecessary.) ? ordering information ordering number lead free halogen free package packing UB211CXXL-AF5-R ub211cxxg-af5-r sot-25 tape reel note: xx: output voltage, re fer to marking information.
ub211c preliminary cmos ic unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r502-482.b ? marking information package voltage code (note) marking sot-25 aa 1 b2cxx voltage code 2 3 4 5 g:halogen free l: lead free note: refer to se rial code list ? serial code list model code overcharge detection voltage [v cu ](v) overcharge release voltage [v cl ](v) over discharge detection voltage [v dl ](v) over discharge release voltage [v du ](v) over current detection voltage [v diov ](v) ub211c aa 4.200 4. 100 2.800 2.900 0.150 ? pin configuration ? pin description pin no. pin name description 1 v m for current sense and charger detection input pin 2 v dd positive power input 3 v ss negative power input 4 do for discharge control: fet gate connection pin 5 co for charge control: fet gate connection pin
ub211c preliminary cmos ic unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r502-482.b ? block diagram oscillator overdischarge detector overcharge detector charger detector discharge over current detector discharge short circuit detector v dd v ss v m do 0v battery charge inhibition detector charge over current detector divider control logic v m co
ub211c preliminary cmos ic unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r502-482.b ? absolute maximum rating (v ss =0v, t a =25 unless otherwise specified) parameter symbol ratings unit input voltage between v dd and v ss (note2) v dd v ss -0.3 ~ v ss +12 v co output pin voltage v co v dd -12 ~ v dd +0.3 v do output pin voltage v do v ss -0.3 ~ v dd +0.3 v vm input pin voltage v m v dd -14 ~ v dd +0.3 v ambient operating temperature t opr -40 ~ +85 storage temperature t stg -55 ~ +125 note: 1. absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings only and functional device oper ation is not implied. 2. pulse ( sec) noise exceeding the above input voltage (v ss +12v) may cause damage to the ic. ? electrical characteristics (v ss =0v, ta=25 unless otherwise specified) parameter symbol test conditions min typ max unit current consemption supply current i ope v dd =3.5v, v m =0v 3.0 8.0 a power-down current i pdn v dd =v m =1.5v 0.2 0.5 a operating voltage operating voltage between v dd -pin and v ss -pin v ds1 1.5 8 v operating voltage between v dd -pin and v m -pin v ds2 1.5 10 v detection voltage overcharge detection voltage v cu v cu -0.040 v cu v cu +0.040 v v cl v cu v cl -0.050 v cl v cl +0.050 v overcharge release voltage v cl v cl =v cu v cl -0.040 v cl v cl +0.040 v overdischarge detection voltage v dl v dl -0.080 v dl v dl +0.080 v v du v dl v du -0.100 v du v du +0.100 v overdischarge release voltage v du v du =v dl v du -0.080 v du v du +0.080 v discharge over current detection voltage v diov v dd =3.0v v diov -0.03 v diov v diov +0.03 v discharge short circuit detection voltage v short v dd =3.0v 0..30 0.50 0.70 v charge over current detection voltage v ciov -0.18 -0.10 -0.02 v charger detection voltage v cha v du v dl -1.2 -0.7 -0.2 v 0v battery charge voltage 0v battery charge inhibition battery voltage v 0inh 1.8 v internal resistance resistance between vm-pin and v ss -pin r vmd v dd =1.8v, v m =0v 100 300 900 k ? resistance between vm-pin and v dd -pin r vmd v dd =3.5v, v m =1.0v 10 30 70 k ? output resistance co-pin resistance ?h? r coh v co =3.0v, v dd =3.5v, v m =0v 5 10 k ? co-pin resistance ?l? r col v co =0.5v, v dd =4.5v, v m =0v 5 10 k ? do-pin resistance ?h? r doh v do =3.0v, v dd =3.5v, v m =0v 5 10 k ? do-pin resistance ?l? r dol v do =0.5v, v dd =v m =1.8v 5 10 k ? delay time overcharge detection delay time t cu 0.9 1.2 1.5 s overdischarge detection delay time t dl 110 150 190 ms discharge over current detection delay time t diov v dd =3.0v 6 9 12 ms discharge short circuit detection delay time t short v dd =3.0v 120 300 380 s charge over current detection delay time t ciov 6 9 12 ms
ub211c preliminary cmos ic unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r502-482.b ? operation 1. normal condition this ic monitors the voltage of the battery connected between the v dd pin and v ss pin and the voltage difference between the vm pin and vss pin to control charging and discharging. wh en the battery voltage is in the range from overdischarge detection voltage (v dl ) to overcharge detection voltage (v cu ), and the vm pin voltage is in the range from the charge ov ercurrent detection voltage (v ciov ) to discharge overcurrent detection voltage (v diov ), the ic turns both the charging and dischar ging control fets on. this condition is called the normal conditon, and in this condition charging and disc harging can be carried out freely. the resistance (r vmd ) between the vm pin and v dd pin, and the resistance (r vms ) between the vm pin and v ss pin are not connected in the normal status. note: when the battery is connected for the first time, dischargi ng may not be enabled. in this case, short the vm pin and v ss pin or connect the charger to restore the normal condition. 2. overcharge condition when the battery voltage becomes hig her than overcharge detection voltage (v cu ) during charging in the normal condition and this state continues for the overcharge detection delay time (t cu ), the utc ub211c series turns the charging control fet off to stop charging. this state is called the overcharge condition. the resistance (r vmd ) between the v m pin and v dd pin, and the resistance (r vms ) between the v m pin and v ss pin are not connected in the overcharge condition.the overcharge condition is released in the following two cases. (1) when the vm pin voltage is higher than or equal to the charge overcurrent detection voltage (v ciov ), and is lower than the discharge overcurrent detection voltage (v diov ), utc ub211c series releases the overcharge status when the battery voltage falls below the overcharge release voltage (v cl ). (2) when the vm pin voltage is higher than or equal to the discharge overcurrent detection voltage (v diov ), utc ub211c series releases the overcharge condition when the battery voltage falls below the overcharge detection voltage (v cu ). the discharge is started by connecting a load after the ov ercharge detection, the vm pin voltage rises more than the voltage at vss pin, bec ause the discharge current flows through t he charging control fet. if this vm pin voltage is higher than or equal to t he discharge overcurrent detection voltage (v diov ), utc ub211c series releases the overcharge status when the battery voltage is lowe r than or equal to the overcharge detection voltage (v cu ). for the actual application boards, changing the battery voltage and the charger voltage simultaneously enables to measure the overcharge release voltage (v cl ). in this case, the charger is always necessary to have the equivalent voltage level to the battery vo ltage. the charger keeps vm pin volt age higher than or equal to the charge overcurrent detection voltage (v ciov ) and lower than or equal to the disc harge overcurrent detection voltage (v diov ). utc ub211c series releases the overcharge status when the battery voltage falls below the overcharge release voltage (v cl ). note 1. if the battery is charged to a voltage higher than overcharge detection voltage (v cu ) and the battery voltage does not fall below overcharge detection voltage (v cu ) even when a heavy load is connected, discharge overcurrent detection and load short-circuiting detection do not function until the battery voltage falls below overcharge detection voltage (v cu ). since an actual battery has an internal impedance of tens of m ? , the battery voltage drops immediately after a heavy load that causes overcurrent is connected, and discharge overcurrent detection and load shor tcircuiting detection function. note 2. when a charger is connected after overcharge detection, the overcharge status is not released even if the battery voltage is below overcharge release voltage (v cl ). the overcharge status is released when the vm pin voltage goes over the charge overcurrent detection voltage (v ciov ) by removing the charger. 3. overdischarge condition when the battery voltage falls below overdischarge detection voltage (v dl ) during discharging in the normal status and the detection continues for t he overdischarge detection delay time (t dl ) or longer, the utc ub211c series turns the discharging control fet off to stop disch arging. this condition is call ed the overdischarge status. under the overdisc harge status, the v m pin voltage is pulled up by the resi stor between the vm pin and vdd pin in the ic (r vmd ). when voltage difference between the v m pin and v dd pin then is 1.3 v (typ.) or lower, the current consumption is reduced to the power-down current consumption (i pdn ). this condition is called the power-down status. the resistance (r vms ) between the v m pin and v ss pin is not connected in the power-down status and the overdischarge status. the power-down status is released when a charger is connected and the voltage difference between the v m pin and v dd pin becomes 1.3 v (typ.) or higher. when a battery in the overdischarge condition is connected to a charger and provided that the v m pin voltage is lower than -0.7 v (typ.), the utc ub211c series releases the overdischarge status and turns the discharging fet on when the battery voltage reaches overdischarge detection voltage (v dl ) or higher. when a battery in the overdischarge status is connected to a charger and provided that the v m pin voltage is not lower than -0.7 v (typ.), the utc ub211c series releases the overdischarge status when the battery voltage reaches overdischarge release voltage (v du ) or higher.
ub211c preliminary cmos ic unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r502-482.b ? operation (cont.) 4. discharge overcurrent condition (disch arge overcurrent, load short-circuiting) when a battery in the normal condition is in the status where t he voltage of the v m pin is equal to or higher than the discharge overcurrent detection volta ge because the discharge current is hi gher than the specified value and the status lasts for the discharge overcu rrent detection delay time, the disc harge control fet is turned off and discharging is stopped. this status is ca lled the discharge overcurrent condition. in the discharge overcurrent condition, the v m pin and v ss pin are shorted by the resistor between v m pin and v ss pin (r vms ) in the ic. however, the voltage of the v m pin is at the v dd potential due to the load as long as the load is connected. when the lo ad is disconnected, the v m pin returns to the v ss potential. this ic detects the condition when t he impedance between the eb+ pin and eb ? pin (refer to the typical application circuit ) increases and is equal to the impedance that enabl es automatic restorati on and the voltage at the vm pin returns to discharge overcurrent detection voltage (v diov ) or lower, the discharge overcurrent condition is restored to the normal condition. even if the connected impedance is smaller than automatic restorat ion level, the utc ub211c series will be restored to the normal status from discharge over current detection status when the voltage at the v m pin becomes the discharge overcurrent detection voltage (v diov ) or lower by connecting the charger. the resistance (r vmd ) between the v m pin and v dd pin is not connected in the discharge overcurrent detection condition. 5. charge overcurrent condition when a battery in the normal status is in the status where the voltage of the v m pin is lower than the charge overcurrent detection voltage because the c harge current is higher than the spec ified value and the status lasts for the charge overcurrent detection delay time, the charge control fet is turned off and charging is stopped. this status is called the c harge overcurrent status. this ic will be restored to the normal st atus from the charge ov ercurrent status when, t he voltage at the vm pin returns to charge overcurrent detection voltage (v ciov ) or higher by removing the charger. the charge overcurrent detection function do es not work in the overdischarge status. the resistance (r vmd ) between the vm pin and vdd pin, and the resistance (r vms ) between the vm pin and vss pin are not connected in t he charge overcurrent status. 6. 0 v battery charging function ?unavailable? this function inhibits recharging when a battery that is internally short-circuited (0 v battery) is connected. when the battery voltage is the 0 v battery charge inhibition battery voltage (v 0inh ) or lower, the charging control fet gate is fixed to the eb ? pin (refer to the typical application circuit ) voltage to inhibit charging. when the battery voltage is the 0 v battery charge inhibition battery voltage (v 0inh ) or higher, charging can be performed. caution some battery providers do not recommend chargi ng for a completely self-discharged battery. please ask the battery provider to determine whether to enabl e or inhibit the 0 v battery charging function. 7. delay circuit (1) the discharge overcurrent detection delay time (t diov ) and the load short-circuiting detection delay time (t short ) start when the discharge overcurrent detection voltage (v diov ) is detected. when t he load shortcircuiting detection voltage (v short ) is detected over the load short- circuiting detection delay time (t short ) after the detection of discharge overcurrent detection voltage (v diov ), the utc ub211c turns the discharging control fet off within t short from the time of detecting v short . (2) when any overcurrent is detected and the overcurrent continues for longer than the overdischarge detection delay time (t dl ) without the load being released, the status changes to the power-dow n status at the point where the battery voltage falls below overdischarge detection voltage (v dl ). (3) when the battery voltage falls below overdischarge detection voltage (v dl ) due to overcurrent, the utc ub211c series turns the discharging control fet off via overcurre nt detection. in this case, if the recovery of the battery voltage is so slow that the battery voltage after the overdischarge detection delay time is still lower than the overdischarge detection voltage, utc ub211c series shifts to the power-down status.
ub211c preliminary cmos ic unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r502-482.b ? timing chart (1) overcharge detection, overdischarge detection v cu v cl v du v dl v dd v ss v dd v ss v dd v cha v ciov v ss v diov v short t cu t dl charger load
ub211c preliminary cmos ic unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r502-482.b ? timing chart (cont.) (2) discharge overcurrent detection v cu v cl v du v dl v dd v ss v dd v ss battery voltage v dd v cha co pin do pin v m pin v ciov v ss v diov v short t diov t short charger load
ub211c preliminary cmos ic unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r502-482.b ? timing chart (cont.) (3) charge overcurrent detection v cu v cl v du v dl v dd v ss v dd v ss battery voltage v dd v cha co pin do pin v m pin v ciov v ss v diov v short t dl t ciov charger load t civo t dl
ub211c preliminary cmos ic unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r502-482.b ? typical application circuit m1 m2 r1=100~470 ? c1=0.1f r2=1k ? do co v dd v ss v m battery eb+ eb- ub211c note 1. overdischarge detection voltage must be higher than the threshold voltage of m1 and m2, if not, the m1 may not cut the charging current. if t he threshold voltage of m1 equal to or higher than the overdischarge detection voltage is used, discharging may be stopped before overdischarge is detected. 2. charger voltage must be higher than the withstanding vo ltage between the gate and source of m1 and m2, if not, m1 and m2 may be destroyed. 3. resistance of r1 can?t be hi gh, the value is about from 100 ? to 470 ? , if r1 has a high resistance, the voltage between vdd pin and vss pin may exceed t he absolute maximum rating when a charger is connected in reverse since the current flows from the charger to the ic. insert a resistor of 100 ? or higher as r1 for esd protection 4. the capacitance of c1 must not be less than 0.022 f, if not, do pin may oscillate when load short-circuiting is detected. be sure to connect a capacitor of 0.022 f or higher to c1, the typical value is about 0.1 f. 5. the resistance of r2 can not be higher than 2k ? , if not, the charging current may not be cut when a high-voltage charger is connected. utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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