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unisonic technologies co., ltd ub242 preliminary cmos ic www.unisonic.com.tw 1 of 13 copyright ? 2009 unisonic technologies co., ltd qw-r502-307.c ? ordering information ? marking lithium-ion/polymer battery protection ic ? description utc ub242 is a series of lithium-ion / lithium-polymer rechargeable battery protection ics incorporating high accuracy voltage detection circuits and delay circuits. utc ub242 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 required external components make it ideal to integrate the utc ub242 into the 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 =4.200v~4.400v * overcharge release voltage: v ocr =4.005v~4.225v * over discharge detection voltage : v odl =2.15v~3.00v * over discharge release voltage: v odr =2.32v~3.10v * over current detection voltage: v oi1 =0.05v~0.20v * 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 ? * delay times are generated by an internal circuit. (external capacitors are unnecessary.) * halogen free sot-26 4 5 3 2 1 6 ordering number package packing UB242XG-AG6-R sot-26 tape reel
ub242 preliminary cmos ic unisonic technologies co., ltd 2 of 13 www.unisonic.com.tw qw-r502-307.c ? pin configuration ? pin description ? serial code list model code overcharge detection voltage [v ocu ](v) overcharge release voltage [v ocr ](v) over discharge detection voltage [v odl ](v) over discharge release voltage [v odr ](v) over current detection voltage [v oi1 ](mv) a 4.3250.050 4.0750.050 2.500.10 2.900.10 10030 b 4.3500.050 4.1500.050 2.300.10 3.000.10 10030 c 4.3250.050 4.0750.050 2.500.10 2.900.10 15030 d 4.3000.050 4.0800.050 2.500.10 2.900.10 15030 e 4.3000.050 4.0800.050 2.500.10 2.900.10 10030 f 4.2750.050 4.1750.050 2.300.08 2.450.08 10030 g 4.2800.050 4.1750.050 2.900.10 3.000.10 15030 ub242 h 4.2500.050 4.0550.050 2.250.10 2.850.10 15030 pin no pin name description 1 od for discharge control: fet gate connection pin 2 csi for current sense input pin, and charge detect 3 oc for charge control :fet gate connection pin 4 ds for reduce delay time: test pin 5 v dd positive power input 6 v ss negative power input
ub242 preliminary cmos ic unisonic technologies co., ltd 3 of 13 www.unisonic.com.tw qw-r502-307.c ? block diagram
ub242 preliminary cmos ic unisonic technologies co., ltd 4 of 13 www.unisonic.com.tw qw-r502-307.c ? absolute maximum rating (v ss =0v, ta=25 unless otherwise specified) ? electrical characteristics (v ss =0v, ds=floating, ta=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 oc output pin voltage v oc v dd -15 ~ v dd +0.3 v od output pin voltage v od v ss -0.3 ~ v dd +0.3 v csi input pin voltage v csi v dd -15 ~ v dd +0.3 v ds input pin voltage v ds v ss -0.3 ~ v dd +03 v operating temperature t orp -40 ~ +85 storage temperature t stg -40 ~ +125 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 v ocu -0.050 v ocu v ocu +0.050 v overcharge release voltage v ocr v ocr -0.050 v ocr v ocr +0.050 v overdischarge detection voltage v odl v odl -0.100 v odl v odl +0.100 v overdischarge release voltage v odr v odr -0.100 v odr v odr +0.100 v over current detection voltage v oi1 v oi1 -0.030 v o/1 v oi1 +0.030 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 v dd =3.6v to4.5v, ds=floating 0.7 1.3 1.9 s overcharge detection delay time t oc v dd =3.6v to 4.5v, v ds =v dd 10 20 30 ms v dd =3.6v to 2.0v, ds=floating 100 180 260 ms overdischarge detection delay time t od v dd =3.6v to 2.0v, v ds =v dd 6 11 17 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 50 s other oc pin output ?h? voltage v oh1 v dd =3.9v, i oh =-50 a 3.4 3.7 v oc pin output ?l? voltage v ol1 v dd =4.5v, csi=0v 0.1 0.5 v od pin output ?h? voltage v oh2 v dd =3.9v, i oh =-50 a 3.4 3.7 v od pin output ?l? voltage v ol2 v dd =2.0v, i ol =50 a 0.1 0.5 v note: if v ds =v dd , the delay time will be reduced, and the test time for v ocu or v odl will also be reduced.
ub242 preliminary cmos ic unisonic technologies co., ltd 5 of 13 www.unisonic.com.tw qw-r502-307.c ? typical application circuit
ub242 preliminary cmos ic unisonic technologies co., ltd 6 of 13 www.unisonic.com.tw qw-r502-307.c ? description of operation 1. normal condition the voltage of the battery connected between v dd and v ss can be monitored by the ub242 .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 , ub242 will turn on the m2 (charging) and m1 (discharging) control mosfets. 2. overcharge condition m2 will be turned off under this condition: the batte ry 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). 3. release of overcharge condition two ways to return to normal condition from overcharge condition: (1.) under the condition: the batte ry is self discharging, and if v dd < v ocr and v oi1 > v csi > v ch occurs, ub242 will be back to normal condition. (2.) connect ub242 to a load and remove the charger. 4. overdischarge condition m1 will be turned off to stop discharging 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).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, m1 will be turned on when v dd > v odl , and then 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 m2 will be turned off to stop this charging status. 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 volt age 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: m1 will be turned off 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 , m1 will be turned on and the back to normal condition. 10. ds pin the delay time of the overcharge and overdischarge can be reduced to within 50ms by forcing ds to v dd. a 1.6m ? pull down resistor should be connected between ds pin and v ss internally. in the actual application ds pin should be left open or connected to v ss .
ub242 preliminary cmos ic unisonic technologies co., ltd 7 of 13 www.unisonic.com.tw qw-r502-307.c ? timing diagram 1. overcharge condition ? self discharge ? normal condition toc self discharge charger load v ocu v ocr v odr vdd csi v odl vdd vss vdd v ch vss
ub242 preliminary cmos ic unisonic technologies co., ltd 8 of 13 www.unisonic.com.tw qw-r502-307.c ? timing diagram(cont.) 2. overcharge condition ? load discharge ? normal condition charger load vocu vocr vodr vdd csi vodl vdd vss vdd voi1 vch vss toc toc
ub242 preliminary cmos ic unisonic technologies co., ltd 9 of 13 www.unisonic.com.tw qw-r502-307.c ? timing diagram(cont.) 3. overcharge condition ? charger remains connected and vcsi>vch ? self discharge toc self discharge charger load v ocu v ocr v odr vdd csi v odl vdd vss vdd v ch vss self discharge toc
ub242 preliminary cmos ic unisonic technologies co., ltd 10 of 13 www.unisonic.com.tw qw-r502-307.c ? timing diagram(cont.) 4. overcharge condition ? charger remains connected and vcsi ub242 preliminary cmos ic unisonic technologies co., ltd 11 of 13 www.unisonic.com.tw qw-r502-307.c ? timing diagram(cont.) 5. overdischarge condition ? charging by a charger ? normal condition tod tod charger load vocu vocr vodr vdd csi vodl vdd vss vdd vch battery voltage oc pin od pin csi pin vss voi2
ub242 preliminary cmos ic unisonic technologies co., ltd 12 of 13 www.unisonic.com.tw qw-r502-307.c ? timing diagram(cont.) 6. overdischarge condition ? abnormal charger current condition ? normal condition tod toc charger load vocu vocr vodr vdd csi vodl vdd vss vdd vch battery voltage oc pin od pin csi pin vss voi2
ub242 preliminary cmos ic unisonic technologies co., ltd 13 of 13 www.unisonic.com.tw qw-r502-307.c ? timing diagram(cont.) 7. over current and short circuit condition ? normal condition charger load vocu vocr vodr vdd csi vodl vdd vss vdd voi1 battery voltage oc pin od pin csi pin vss voi2 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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