unisonic technologies co., ltd ub24205 preliminary cmos ic www.unisonic.com.tw 1 of 10 copyright ? 2009 unisonic technologies co., ltd qw-r121-019.a lithium-ion/polymer battery protection ic ? description the utc ub24205 is a lithium-ion / lithium-polymer rechargeable battery protection ic with internal mosfets. it incorporates high accuracy voltage detection circuits and delay circuits. the utc ub24205 is suitable for protection of single cell lithium-ion / lithium polymer battery packs from overcharge, over discharge and over current. the small package and less required external components make it ideal to be integrated into limited space of battery pack. ? features * wide supply voltage range: v dd =1.8v~9.0v * ultra-low quiescent current: i dd =3.0 a (v dd =3.9v) * ultra-low power-down current: i pd =0.1 a (v dd =2.0v) * overcharge detection voltage: v ocu =4.250v0.050v * overcharge release voltage: v ocr =4.055v0.050v * over discharge release voltage: v odl =2.250v0.100v * over discharge detection voltage: v odr =2.850v0.100v * over current detection voltage: v oi1 = 0.150v0.030v * short circuit detection voltage: v oi2 =1.35v (fixed) * charger detection voltage: v ch =-0.7v * reset resistance for over current protection: r short > 500k ? * no external mosfets * delay times are generated by an internal circuit (external capacitors are unnecessary). * halogen free ? ordering information ordering number package packing UB24205G-S08-R sop-8 tape reel
ub24205 preliminary cmos ic unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r121-019.a ? pin configuration 1 drain v dd batn pvss csi drain v ss v ss 2 3 4 5 6 7 8 ? pin description pin no. pin name description 1 batn negative charge input, and load negative input 2 pvss negative battery input 3 csi current sense input, and charge detect 4 v dd positive power input 5,6 v ss negative power input 7,8 drain output: the drain terminals of two internal mosfets
ub24205 preliminary cmos ic unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r121-019.a ? block diagram control logic oscillator and divider overdischarge detector overcharge detector charger detector over current detector short circuit detector csi od oc pvss batn drain drain v ss v ss v dd
ub24205 preliminary cmos ic unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r121-019.a ? absolute maximum rating (v ss =0v, ta=25 , unless otherwise specified) ? electrical characteristics (v ss =0v, ta=25c, 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 csi input pin voltage v csi v dd -15 ~ v dd +0.3 v batn input pin voltage v batn v dd -15 ~ v dd +0.3 v operating temperature t orp -40 ~ +85 c storage temperature t stg -40 ~ +125 c note: 1. absolute maximum ratings are those values beyond which the device could be permanently damaged. absolute maximum ratings are stress ratings onl y 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. parameter symbol test conditions min typ max unit current consemption supply current i dd v dd =3.9v 3.0 6.0 a power-down current i pd v dd =2.0v 0.1 a operating voltage operating input voltage v ds1 v dd -v ss 1.8 9.0 v detection voltage overcharge detection voltage v ocu 4.200 4.250 4.300 v overcharge release voltage v ocr 4.005 4.055 4.105 v overdischarge detection voltage v odl 2.150 2.250 2.350 v overdischarge release voltage v odr 2.750 2.850 2.950 v over current detection voltage v oi1 0.120 0.150 0.180 v short circuit detection voltage v oi2 v dd =3.0v 1.0 1.35 1.75 v reset resistance for over current protection r short v dd =3.6v 350 500 650 k ? charger detection voltage v ch -1.2 -0.7 -0.2 v delay time overcharge detection delay time t oc v dd =3.6v ~ 4.5v 0.7 1.3 1.9 s overdischarge detection delay time t od v dd =3.6v ~ 2.0v 100 180 260 ms over current detection delay time t oi1 v dd =3.0v 5 10 20 ms short circuit detection delay time t oi2 v dd =3.0v 5 10 65 s mosfet v gs =0v, i ds =1 a 20.0 v drain-source breakdown voltage bv dss v gs =0v, i ds =250 a 20.6 v v gs =0v, v ds =20.0v 1 a drain-source leakage current i dss v gs =0v, v ds =20.6v 250 a v gs =v ds , i ds =1 a 0.6 1.4 v gate threshold voltage v th v gs =v ds , i ds =250 a 0.6 1.4 v v gs =2.5v, i ds =3a 45 m ? v gs =4.5v, i ds =1a 35 m ? equivalent drain-source on-resistance r ds(on) v gs =4.5v, i ds =3a 33 m ?
ub24205 preliminary cmos ic unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r121-019.a ? typical application circuit
ub24205 preliminary cmos ic unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r121-019.a ? application information 1. normal condition the voltage of the battery connected between v dd and v ss can be monitored by the utc ub24205 .the voltage difference between csi and v ss can sense the charge and discharge scheme. under this condition: v odl < v dd < v ocu and v ch < v csi < v oi1 , the utc ub24205 will turn on the charging control mosfet (internal) and discharging control mosfet (internal), the battery?s charging (or discharging) is in normal condition. 2. overcharge condition when the battery voltage becomes higher than the overcharge detection voltage (v ocu ) during normal charging condition through a delay time longer than t oc (the overcharge detection delay time ), the charging will be stopped. 3. release of overcharge condition two ways to return to normal condition from overcharge condition: (1) under the condition: the battery is self discharging, and if v dd < v ocr and v oi1 > v csi > v ch occurs, the utc ub24205 will be back to normal condition. (2) connect the utc ub24205 to a load and remove the charger. 4. overdischarge condition when the battery voltage falls below the overdischarge detection voltage (v odl ) during discharging condition and through a delay time longer than t od (the overdischarge detection delay time ), the discharging will be stopped. and then csi will be pulled up to v dd through an internal resistance. when v csi > v oi2 , the chip will enter into power-down mode. in this mode, the cu rrent consumption is lower than 0.1 a. 5. release of power-down mode there are two ways back to normal condition: (1) if v csi < v ch (charger detection), when v dd > v odl . (2) if v ch < v csi < v oi2, the condition v dd > v odr . 6. charger detection charger detection is this action: while connecting to a charger after entering into power-down mode, then if v dd < v ch and when v dd > v odl , the system will be back to normal condition as described in 1) of previous section. 7. abnormal charge current condition the abnormal charge current condition is when a charger is connected to the battery system in normal condition, then if v dd < v ocu and v csi < v ch occurs through a delay time than t oc (delay time of overcharge detection), and in this condition the charging will be stopped. 8. over current/short circuit condition the over current (or short circuit) condition is when the current is too large during discharging under normal condition as a result of the voltage detected by csi is greater than v oi1 (or v oi2 ) through a delay time t oi1 (t oi2 ). in this over current (or short circuit) condition, the di scharging will be stopped and csi will be pulled down to v ss through an internal resistance. 9. release of over current/short circuit condition if the load is removed or the impedance between v bat+ and v bat- is larger than 500k ? as well as v csi < v oi1 , the system will be back to normal condition.
ub24205 preliminary cmos ic unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r121-019.a ? typical characteristics 1. overcharge condition ? self discharge ? normal condition toc self discharge charger load v ocu v ocr v odr v odl v dd v ch battery voltage csi pin v ss 2. overcharge condition ? load discharge ? normal condition charger load v ocu v ocr v odr v odl v dd v oi1 v ch battery voltage csi pin v ss toc toc
ub24205 preliminary cmos ic unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r121-019.a ? typical characteristics(cont.) 3. overcharge condition ? charger remains connected and v csi > v ch ? self discharge toc self discharge charger load v ocu v ocr v odr v odl v dd v ch v ss self discharge toc 4. overcharge condition ? charger remains connected and v csi < v ch ? self discharge toc self discharge charger load v ocu v ocr v odr v odl v dd v ch battery voltage csi pin v ss toc
ub24205 preliminary cmos ic unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r121-019.a ? typical characteristics(cont.) 5. overdischarge condition ? charging by a charger ? normal condition tod tod charger load v ocu v ocr v odr v odl v dd v ch battery voltage csi pin v ss v oi2 6. overdischarge condition ? abnormal charger current condition ? normal condition tod toc charger load v ocu v ocr v odr v odl v dd v ch battery voltage csi pin v ss v oi2
ub24205 preliminary cmos ic unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r121-019.a ? typical characteristics(cont.) 7. over current and short circuit condition ? normal condition charger load v ocu v ocr v odr v odl v dd v oi1 battery voltage csi pin v ss v oi2 toi1 toi2 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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