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unisonic technologies co., ltd ub244a preliminary cmos ic www.unisonic.com.tw 1 of 11 copyright ? 2012 unisonic technologies co., ltd qw-r502-857.a li-ion battery protection ic for 1-cell to 4-cell pack (secondary protection) ? description the utc ub244a series is secondary protection ic for 1-, 2-, 3-, or 4-cell lithium-ion rechargeable battery packs, and incorporates a high-accuracy voltage detection circuit. the utc ub244a series also includes a high accuracy delay circuit for over voltage detection time can be set by an external capacitor. ? features * high-accuracy voltage detection circuit for each cell * overcharge detection voltage n (n=1 to 4): 4.05v to 4.50v (in 50mv steps) * overcharge hysteresis voltage n (n=1 to 4): 0.38v0.10v, 0.25v0.07v, 0.13v0.04v, 0.045v0.02v, none * delay times for overcharge detection can be set by an external capacitor * cmos output active ?h? * wide operating voltage range 3.6v to 24v * wide operating temperature range ? 40c to +85c * low current consumption: 1.5 a typ. (+25c) at 3.5v for each cell ? ordering information ordering number package packing lead free halogen free ub244al-xx-sm1-r ub244ag-xx-sm1-r msop-8 tape reel note: xx: output voltage, refer to marki ng information. ub244ag-xx-sm1-r (1)packing type (2)package type (3)output voltage code (1) r: tape reel (2) sm1: msop-8 (3) xx: refer to marking information (4) g: halogen free, l: lead free (4)halogen free
ub244a preliminary cmos ic unisonic technologies co., ltd 2 of 11 www.unisonic.com.tw qw-r502-857.a ? pin configuration ? pin description pin no. pin name description 1 v cc positive power input pin 2 sense positive voltage connection pin of battery 1 3 v c1 negative voltage connection pin of battery 1 positive voltage connection pin of battery 2 4 v c2 negative voltage connection pin of battery 2 positive voltage connection pin of battery 3 5 v c3 negative voltage connection pin of battery 3 positive voltage connection pin of battery 4 6 v ss negative power input pin negative voltage connection pin of battery 4 7 i ct capacitor connection pin for overcharge detection delay 8 c o fet gate connection pin for charge ? serial code list model code overcharge detection voltage [v cu ](v) overcharge hystersis voltage [v cd ](v) output form ub244a aa 4.4500.050 0.3800.10 cmos output active ?h? ab 4.1150.050 0.1300.04 cmos output active ?h? ac 4.3500.050 0.0450.02 cmos output active ?h? ad 4.4500.050 0.0450.02 cmos output active ?h? ae 4.3000.050 0.2500.07 cmos output active ?h? af 4.4000.050 0.0450.02 cmos output active ?h? ag 4.5000.050 0.3800.10 cmos output active ?h? ah 4.4750.050 0.3800.10 cmos output active ?h? ai 4.3500.050 0.2500.07 cmos output active ?h? aj 4.1500.050 0.2500.07 cmos output active ?h? ak 4.2500.050 0.2500.07 cmos output active ?h? al 4.0500.050 0.2500.07 cmos output active ?h?
ub244a preliminary cmos ic unisonic technologies co., ltd 3 of 11 www.unisonic.com.tw qw-r502-857.a ? block diagram
ub244a preliminary cmos ic unisonic technologies co., ltd 4 of 11 www.unisonic.com.tw qw-r502-857.a ? absolute maximum rating (t a = 25c unless otherwise specified) parameter symbol ratings unit input voltage between v cc and v ss v ds v ss ? 0.3 ~ v ss +26 v input pin voltage (sense/v c1 /v c2 /v c3 ) v in v ss ? 0.3 ~ v cc +0.3 v co output pin voltage v co v ss ? 0.3 ~ v cc +0.3 v power dissipation (note 2) p d 500 mw operation ambient temperature t opr ? 40 ~ +85 c storage temperature t stg ? 40 ~ +125 c notes: 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. when mounted on printed circuit board. ? electrical characteristics (t a =25c unless otherwise specified) parameter symbol test conditions min typ max unit detection voltage overcharge detection voltage n (n = 1, 2, 3, 4) v cun 4.05v ~ 4.50v adjustment v cun ? 0.050 v cun v cun + 0.050 v overcharge hysteresis voltage n (n = 1, 2, 3, 4) (note 1) v cdn 0.28 0.38 0.48 v delay time overcharge detection delay time t cu c=0.1 f 1.0 1.5 2.0 s operating voltage operating voltage between v cc and v ss (note 2) v dsop 3.6 24 v current consumption current consumption during operation i ope v1=v2=v3=v4=3.5v 1.5 6.0 a current consumption at power down i pdn v1=v2=v3=v4=2.3v 1.2 6.0 a vc1 pin current i vc1 v1=v2=v3=v4=3.5v -0.5 0 0.5 a vc2 pin current i vc2 v1=v2=v3=v4=3.5v -0.5 0 0.5 a vc3 pin current i vc3 v1=v2=v3=v4=3.5v -0.5 0 0.5 a output voltage co ?h? voltage v co(h) i out = -10 a v cc -0.05 v co ?l? voltage v co(l) i out = 10 a vss +0.05 v notes: 1. 0.250.07v, 0.130. 04v, 0.0450.02v except for 0.38v hysteresis models. 2. after detecting the overcharge, the delay circuit operates normally in the ra nge of operating voltage.
ub244a preliminary cmos ic unisonic technologies co., ltd 5 of 11 www.unisonic.com.tw qw-r502-857.a ? operating 1. overcharge detection co is turned to ?h? (for cmos output active ?h?) when t he voltage of one of the batteri es exceeds the overcharge detection voltage (v cu ) during charging under normal conditions bey ond the overcharge detection delay time (t cu ). this state is called ?overcharge.? attaching fet to the co pin provides charge contro l and a second protection. at that time, the overcharge state is maintained until the vo ltage of all batteries decreases from the overcharge detection voltage (v cu ) by the equivalent to the overcharge hysteresis voltage (v cd ). 2. delay circuit the overcharge detection delay time (t cu ) change with an external capacitor (c ict ). the delay times are calculated by the following equations overcharge detection delay time t cu [s] = (15 5 ) c ict [ f] ? timing charts battery voltage v1 battery v2 battery v3 battery v4 battery v cd v cu co pin voltage ict pin voltage vss vss vss vcc vdet cmos output active ?h? and nch open drain models vcc t cu
ub244a preliminary cmos ic unisonic technologies co., ltd 6 of 11 www.unisonic.com.tw qw-r502-857.a ? typical application circuit (1) connection example 1 (for 4-cells) bat1 bat2 bat3 bat4 r4 c4 c3 r3 r2 r1 c1 c2 sense vc1 vc2 vc3 vss co utc ub244a eb+ eb- fet d p sc protector ict c ict r vcc vcc c vcc constants for external components 1 symbol min typ max unit r1 to r4 0 1 k 10 k ? c1 to c4 0 0.1 1 f r vcc 0 100 1 k ? c vcc 0 0.1 1 f c ict 0 0.1 1 f notes: 1. the above constants may be changed without notice. 2. it has not been confirmed whether the operation is normal or not in circuits other than the above example of connection. in addition, the example of connection shown above and the constant do not guarantee proper operation. perform through evaluat ion using the actual application to set the constant.
ub244a preliminary cmos ic unisonic technologies co., ltd 7 of 11 www.unisonic.com.tw qw-r502-857.a ? typical application circuit(cont.) (2) connection example 2 (for 4-cells) bat1 bat2 bat3 bat4 r4 c4 c3 r3 r2 r1 c1 c2 sense vc1 vc2 vc3 vss co utc ub244a eb+ eb- fet d p ict c ict r vcc vcc c vcc sc protector constants for external components 2 symbol min typ max unit r1 to r4 0 1 k 10 k ? c1 to c4 0 0.1 1 f r vcc 0 100 1 k ? c vcc 0 0.1 1 f c ict 0 0.1 1 f notes: 1. the above constants may be changed without notice. 2. it has not been confirmed whether the operation is normal or not in circuits other than the above example of connection. in addition, the example of connection shown above and the constant do not guarantee proper operation. perform through evaluat ion using the actual application to set the constant.
ub244a preliminary cmos ic unisonic technologies co., ltd 8 of 11 www.unisonic.com.tw qw-r502-857.a ? typical application circuit(cont.) (3) connection example 3 (for 3-cells) bat1 bat2 bat3 c3 r3 r2 r1 c1 c2 sense vc1 vc2 vc3 vss co utc ub244a eb+ eb- fet d p sc protector ict c ict r vcc vcc c vcc constants for external components 3 symbol min typ max unit r1 to r3 0 1 k 10 k ? c1 to c3 0 0.1 1 f r vcc 0 100 1 k ? c vcc 0 0.1 1 f c ict 0 0.1 1 f notes: 1. the above constants may be changed without notice. 2. it has not been confirmed whether the operation is normal or not in circuits other than the above example of connection. in addition, the example of connection shown above and the constant do not guarantee proper operation. perform through evaluat ion using the actual application to set the constant.
ub244a preliminary cmos ic unisonic technologies co., ltd 9 of 11 www.unisonic.com.tw qw-r502-857.a ? typical application circuit(cont.) (4) connection example 4 (for 2-cells) bat1 bat2 r2 r1 c1 c2 sense vc1 vc2 vc3 vss co utc ub244a eb+ eb- fet d p sc protector ict c ict r vcc vcc c vcc constants for external components 4 symbol min typ max unit r1 to r2 0 1 k 10 k ? c1 to c2 0 0.1 1 f r vcc 0 100 1 k ? c vcc 0 0.1 1 f c ict 0 0.1 1 f notes: 1. the above constants may be changed without notice. 2. it has not been confirmed whether the operation is normal or not in circuits other than the above example of connection. in addition, the example of connection shown above and the constant do not guarantee proper operation. perform through evaluat ion using the actual application to set the constant.
ub244a preliminary cmos ic unisonic technologies co., ltd 10 of 11 www.unisonic.com.tw qw-r502-857.a ? typical application circuit(cont.) (5) connection example 5 (for 1-cell) bat1 r1 c1 sense vc1 vc2 vc3 vss co utc ub244a eb+ eb- fet d p sc protector ict c ict r vcc vcc c vcc constants for external components 5 symbol min typ max unit r1 0 1 k 10 k ? c1 0 0.1 1 f r vcc 0 100 1 k ? c vcc 0 0.1 1 f c ict 0 0.1 1 f notes: 1. the above constants may be changed without notice. 2. it has not been confirmed whether the operation is normal or not in circuits other than the above example of connection. in addition, the example of connection shown above and the constant do not guarantee proper operation. perform through evaluat ion using the actual application to set the constant. ? precautions 1. do not connect any of overcharged batteries. even if only one overcharged battery is connected to this ic, the ic detects overcharge, then charge current flows to the delay capacitor through the parasitic diode between pins where the battery is not connected yet. this may lead to a malfunction. please perform sufficient evaluation in the case of use. depending on an applic ation circuit, even when the fault charge battery is not contained, the connection turn of a battery may be restri cted in order to prevent t he output of co detection pulse at the time of battery connection. 2. any position from v1 to v4 can be used when applying this ic for a one to three-cell battery. however, be sure to short circuit between pins not in use ( sense-vc1, vc1-vc2, vc2-vc3, or vc3-vss). 3. the application conditions for the in put voltage, output volta ge, and load current should not exceed the package power dissipation. 4. do not apply an electrostatic discharge to this ic that exceeds the performanc e ratings of the built-in electrostatic protection circuit.
ub244a preliminary cmos ic unisonic technologies co., ltd 11 of 11 www.unisonic.com.tw qw-r502-857.a 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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