preliminary li-ion protection ic with power mos EC9525 page 1 of 9 dr18ev103b-ver2.5 features supply current typ. 3.0ua low supply current standby current (after detecting over-discharge) typ. 0.25ua over-charge detector(topt=25oc) +/- 25mv over-charge detector (topt=0 to 50oc) +/- 30mv high accuracy detector threshold over-discharge detector +/- 3.0% over-charge detector threshold 4.0v to 4.4v step of 0.005v variety of detector threshold over-discharge detector threshold 2.0v to 3.0v step of 0.005v excess current protection 0.04v to 0.32v step of 0.04v built in protection circuit accuracy 20% output delay of over charge time delay at vdd=4.3v 1.0s output delay of over-discharg vdd=2.4v with built-in capacitor 10ms package sop-8/8-pin
preliminary li-ion protection ic with power mos EC9525 page 2 of 9 dr18ev103b-ver2.5 general description the EC9525 is protection ic with power mos for over-charge/discharge of rechargeable one-cell lithium-ion(li+) excess load current, further include a short circuit protector for preventing large external short circuit current. each of these ic is composed of three voltage detectors, a re ference unit, a delay circuit, a short circuit protector, a logic circuit and two n-type power mos. when charging voltage crosses the detector threshold from a low value to value higher than vdet1, the out put of cout pin, the output of over-charge detector/vd 1, switches to low level, charger?s negative pin level. after detecting over-charge th e vd1 can be reset and the output of cout becomes high when the vdd voltage is coming down to a level lower than ?vrel1 ?, or when a kind of loading is connected to vdd after a charger is disconnected from the battery pack while the vdd level is in between ?vdet1? and ?vrel1? in the EC9525. the output of dout pin, the output of over-disch arge detector/vd2, switches to low level after internally fixed delay time passed, when dischargi ng voltage crosses the dete ctor threshold from a high value lower than vdet2. after EC9525 detect the over-discharge voltage, connect a charger to the battery pack, and when the battery supply voltage becomes higher than the over-discharge detector threshold, vd2 is re leased and the voltage of dout becomes ?h? level. an excess load current can be sensed and cu t off after internally fixed delay time passed through the built in excess current detector, vd3 with dout being enabled to low level. once after detecting excess current, the vd3 is released and dout level switches to high by detaching a battery pack from a load system. further, short circuit protector makes dout leve l to low immediately with external short circuit current and re-moving external short circuit leads dout level to high. after detecting over-discharge, supply current will be kept extremel y low by halt some inte rnal circuits operation. the output delay of over-charge det ectors can be set by connecting in ternal capacitors. output type of cout and dout are observed. 8-pi n package, sop-8 is available.
preliminary li-ion protection ic with power mos EC9525 page 3 of 9 dr18ev103b-ver2.5 block diagram pin configurations pin description pin no. symbol pin description 1 p- pin for charge negative input 2 cout output of over-charge detection, cmos output 3 vm internal pin for charge negative input 4 do output of over-discharge detection, cmos output 5 vss ground 6 vss ground 7 v dd power supply 8 p- pin for charge negative input
preliminary li-ion protection ic with power mos EC9525 page 4 of 9 dr18ev103b-ver2.5 absolute maximum ratings vss=0v symbol item ratings unit vdd supply voltage -0.3 to 12 v v- vci- input voltage v- pin vi-pin v dd -20 to v dd +0.3 v dd -20 to v dd +0.3 v v vcout vdout output voltage cout pin dout pin v dd -20 to v dd +0.3 vss-0.3 tov dd +0.3 v v p d power dissipation 150 mw topt operating temperature range -40 to85 oc tstg storage temperature range -55 to 125 oc absolute maximum ratings are threshold limit valu es that must not be exceeded ever for an instant under any conditions. moreover, such valu es for any two items must not be reached simultaneously. operation above these absolute maximum ratings may cause degradation or permanent damage to the device. these are st ress ratings only and do not necessarily imply functional operation below these limits.
preliminary li-ion protection ic with power mos EC9525 page 5 of 9 dr18ev103b-ver2.5 electrical c haracteristic temp=25oc symbol item conditions min. typ. max. unit vdd1 operating input voltage voltage defined as vdd-vss 1.5 10 v 25oc 4.250 4.275 4.300 v vdet1 over-charge threshold detect rising edge of supply voltage 003 0~50oc *note 4.240 4.275 4.310 v vrel1 release voltage for over-charge detection -- 003 4.050 4.075 4.10 v tvdet1 output delay of over charge vdd=3.6v to 4.3v 0.6 1.0 1.4 s vdet2 over-discharge threshold detect falling edge of supply voltage 003 2.425 2.500 2.575 v tvdet2 output delay of over-discharge vdd=3.6v to 2.4v 7 10 13 ms vdet3 excess current threshold detect rising edge of ?v-? pin voltage 003 0.1 0.12 0.14 v tvdet3 output delay of excess current vdd=3.0v 11 16 21 ms vshort short protection voltage vdd=3.0v vdd- 1.2 vdd- 0.9 vdd- 0.6 v tshort output delay of short protection vdd=3.0v 300 400 us rshort reset resistance for excess current protection vdd=3.6v, v-=1.0v 50 100 150 kohm i gss gate leakage current v gs = 10 v, v ds = 0 v 10 ua i dss drain cut.off current v ds = 20 v, v gs = 0 v 10 ua v (br) dss i d = 10 ma, v gs = 0 v 20 v v (br) dsx drain.source breakdown voltage i d = 10 ma, v gs = .-12 v 15 v v th gate threshold voltage v ds = 10 v, i d = 200 a 0.5 1.2 v r ds (on ) v gs = 2.5 v, i d = 3a 28 m ? r ds (on ) drain-source on resistance vgs = 4 v, id = 3 a 40 m ? vol1 nch on voltage of cout iol=50ua, vdd=4.4v 0.35 0.5 v voh1 pch on voltage of cout iol=-50ua, vdd=3.9v 3.4 3.7 v vol2 nch on voltage of dout iol=50ua, vdd=2.4v 0.2 0.5 v voh2 pch on voltage of dout iol=-50ua, vdd=3.9v 3.4 3.7 v idd supply current vdd=3.9v, v-=0v 3.0 5.0 ua istandby standby current vdd=2.0v 0.25 0.4 ua
preliminary li-ion protection ic with power mos EC9525 page 6 of 9 dr18ev103b-ver2.5 *note: considering of variation in process paramete rs, we compensate for this characteristic related to temperature by laser-trim, however, this sp ecification is guaranteed by design, not production tested. operation vd1/over-charge detector the vd1 monitors vdd pin vo ltage. when the vdd voltage crosses over charge detector threshold vdet1 from a low value to a valu e higher than the vdet1, the vd1 can sense a over-charging and an external charge control nch- mos-fet turns to ?off? with cout pin being at ?l? level. there can be two cases to reset the vd1 making th e cout pin level to ?h ? again after detecting over-charge. resetting the vd1 can make charging system allowable to resumption of charging process. the first case is in such conditions that a time when the vdd voltage is coming down to a level lower than ?vrel1?. while in the second case, connecting a kind of loading to vdd after disconnecting a charger from the battery pack can make the vd1 resetting when the vdd level is in between ?vdet1? and ?vrel1?. after detecting over-charge with the vdd voltage of higher th an vdet1, connecting system load to the battery pack makes load current allo wable through parasitic di ode of external charge control fet. the cout level w ould be high when the vdd level is coming down to a level below the vdet1 by continuous dr awing of load current. an output delay time for over-charge detection can be set by external capacitor c3 connecting between the vss pin and ct pin. the external cap acitor can make a delay time from a moment detecting over-charge to a time output a signal which enables ch arge control fet turn off. when the vdd level is going up to a higher level than vdet1 if the vdd voltage would be back to a level lower than the vdet1 within a time period of the output delay time, vd1 would not output a signal for turning off the charge control fet. a level shifter incorporated in a buffer driver fo r the cout pin makes the ?l? level of cout pin to the v- pin voltage and the ?h? level of c out pin is set to vdd voltage with cmos buffer vd2/over-discharge detector the vd2 is monitoring a vdd pin voltage. when the vdd voltage crosse s the over-discharge detector threshold vdet2 from a high value to a value lower th an the vdet2, the vd2 can sense an over-discharging and the extern al discharge control nch mosft turns to ?off? with the dout pin being at ?l? level. to reset the vd2 with the dout pin level being ?h? again after detecting over-discharge it is necessary to connect a charger to the battery pack for EC9525. wh en the vdd voltage stays under over-discharge detector threshold vdet2 charge current can flow through parasitic diode of external discharge control mosfet, then after the vdd voltage comes up to a value larger than vdet2, dout becomes ?h? and di scharging process would be ab le to advance through on state mosfet for discharge control. connecting a charger to the battery pack makes the dout level being ?h ? instantaneously when the vdd voltage is higher than vdet2.
preliminary li-ion protection ic with power mos EC9525 page 7 of 9 dr18ev103b-ver2.5 besides, for EC9525, when a cell voltage reaches equal or more than over-discharge released voltage, or vdet2, over-discharge condition can be also released. an output delay time for the over-discharge detec tion is fixed internally, tvdet2 =10ms typ. at vdd=2.4v. when the vdd level is going down to a lower level than vdet2 if the vdd voltage would be back to a level higher than the vdet2 w ithin a time period of th e output delay time, vd2 would not output a signal for turni ng off the discharge control fet. after detection of an over-discharge by vd2, supply current w ould be reduced to typ. 0.3ua at vdd=2.0v and into standby, only the charger detector is operating. the output type of dout pin is cmos having ?h? level of vdd and ?l? level of vss. vd3/excess current detector, short circuit protector both of the excess current detector and short circuit protector can work when both control fets are in ?on? state. when the v- pin voltage is going up to a value between the short protection voltage vshort/vdd and excess current threshold vdet3, the excess current detector operates and further soaring of v- pin voltage hi gher than vshort makes the short circuit protector enabled. this leads the external discharge control nch mosfet turn off with the dout pin being at ?l? level. an output delay time for the excess current de tector is internally fixed, 13ms typ. at vdd=3.0v. aquick recovery of v- pin level from a value between vshort and vdet3 within the delay time keeps the discharge control fet staying ?h? state. when the short circuit protector is enabled, the d out would be low and its delay time would be 5us typ. the v- pin has a built-in pulled down resistor , typ. 100kohm with connec ting to the vss pin. after an excess current or short circuit prot ection is detected, removing a cause of excess current or external short circuit makes an exte rnal discharge control fet to an ?on? state automatically with the v- pin level being dow n to the vss level through pulled down resistor built-in internally. if vdd voltage would be higher than vdet2 at a time when the excess current is detected the EC9525 does not enter a standby mode, or otherwise in case of lower vdd voltage than vdet2 would lead the EC9525 into a standby. after detecting short circuit the EC9525 will not enter a standby mode.
preliminary li-ion protection ic with power mos EC9525 page 8 of 9 dr18ev103b-ver2.5 application circuits application hints r1 and c1 will stabilize a suppl y voltage to the EC9525. a recommended r1 value is less than 1kohm. a larger value of r1 lead s higher detection voltage, makes some errors, because of shoot through current flowed in the EC9525. r1 and r2 may cause power consumption over rating of power dissipation of the EC9525 and a total of ?r1+r2? shoul d be more than 1kohm.
preliminary li-ion protection ic with power mos EC9525 page 9 of 9 e-cmos corporation ic datasheet address: no.1, creation rd. 2 nd , science-based industr ial park, hsin-chu 300, taiwan, r.o.c . website: http://www.ecmos.com.tw e-mail : sales@ecmos.com.tw tel: 886-3-5783622 fax:886-3-5783630
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