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ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 1 of 22 4j03n-rev.f002 descriptions the ec9528 a series are the 1 - cell protection ic for lithium-ion/lithium-polymer rechargeable battery pack. the high accuracy voltage detector and delay time circuits a re built in ec9528a series with state-of-art design and process. to minimize power consumption, ec9528a series activ ates power down mode when an over-discharge event i s detected (for power-down mode enabled version). besides, ec9 528a series performs protection functions with four external components for miniaturized pcb. the tiny package is especially suitable for compact portable device, i.e. slim mobile phone and blueto oth earphone. feature high detection accuracy - over-charge detection: 15mv - over-discharge detection: 35mv - discharge over-current detection: 10mv - charge over-current detection: ? 20mv high withstand voltage - absolute maximum ratings: 28v(v pin and co pin) ultra small package sot235 sot236 dfn1.6x1.66l son1.6x1.66l application mobile phone battery packs digital camera battery packs bluetooth earphone liion battery module
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 2 of 22 4j03n-rev.f002 version code version code version code version code version code version code version code version sot - 23 - 5 sot - 23 - 6 dfn - 1.6x1.6 - 6l son - 1.6x1.6 - 6l hfa - hfa 10 10 hfb - hfb 11 11 hqa hqa hqa - 13 hqb hqb hqb - 14 hqc - hqc 12 12 nha nha nha - 15 nhb nhb nhb - 16 ordering information ec9528a-xxx xx x note 1 version code ( for marking) part number package marking marking information ec9528a-hqab2r sot23-5l bnxxx llll ec9528a-xxxb3r sot23-6l bnxxx llll 1. bn product code 2. xxx version code(see note 1) 3. llll lot no. EC9528A-XXXF4R dfn 1.6*1.6 6l bnxx llll ec9528a-xxxf5r son 1.6*1.6 6l bnxx llll 1. bn product code 2. xx version code(see note 1) 3. llll lot no. b2 sot23-5l b3 sot23-6l f4 dfn 1.6*1.6 6l f5 son 1.6*1.6 6l r tape & reel version type
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 3 of 22 4j03n-rev.f002 version code pack- age type over- charge detection voltage vdet1 (v) over- charge hysteres is voltage vhys1 (v) over- discharg e detection voltage vdet2 (v) over- discharg e release voltage vrel2 (v) discharg e over- current detection voltage vdet3 (v) charge over- current detection voltage vdet4 (v) load short- circuiting detection voltage vshort(v ) 0v battery charge function delay time table 2 hfa b3/f4/f5 4.280 0.00 2.3 2.3 0.10 -0.1 0.5 un-available (1) hfb b3/f4/f5 4.280 0.00 2.3 2.3 0.13 -0.1 0.5 un-available (1) hqa b2/b3/f5 4.280 0.15 2.8 3.1 0.15 -0.1 0.5 un-available (2) hqb b2/b3/f5 4.280 0.15 2.8 3.1 0.10 -0.1 0.5 un-available (2) hqc b3/f4/f5 4.280 0.00 2.8 3.1 0.15 -0.1 0.5 un-available (1) nha b2/b3/f5 4.425 0.20 2.4 2.4 0.10 -0.1 0.5 un-available (1) nhb b2/b3/f5 4.425 0.20 2.4 2.4 0.15 -0.1 0.5 un-available (1) delay time over-charge delay time t vdet1 (s) over-discharge delay time t vdet2 (ms) discharge over-current delay time t vdet3 (ms) charge over-current delay time t vdet4 (ms) load short-circuiting delay time t short (us) (1) 1.0 +/- 20% 125 +/- 20% 8.0 +/- 20% 8.0 +/- 20% 400 +/- 20% (2) 1.2 +/- 20% 150 +/- 20% 9.0 +/- 20% 9.0 +/- 20% 300 +/- 20% product version code: table1: detection threshold level table note: *: (please check detail at below description) for overcharge release condition: when the battery voltage is lower than v det1 C v hys1 and the v- pin voltage is between charge overcurre nt detection voltage (v det4 ) and short detection voltage (v short ), the ec9528a series would release this condition. when the battery voltage is lower than v det1 C v hys1 and charger is removed, the ec9528a series can be r eleased fromthis condition . remark: please contact our sales for the products with dete ction voltage value other than those specified abov e. table2: delay time table remark please contact our sales office for the products w ith detection voltage value other than those specif ied above.
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 4 of 22 4j03n-rev.f002 package and pin description
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 5 of 22 4j03n-rev.f002 typical application circuit block diagram
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 6 of 22 4j03n-rev.f002 symbol descriptions rating units v dd supply voltage 0.3 to 7 v v v pin v dd 28 to v dd + 0.3 v v co co pin v dd 28 to v dd + 0.3 v v do output voltage do pin vss 0.3 to v dd + 0.3 v t opt operating temperature range 40 to +85 c t stg storage temperature range 55 to +125 c symbo l item conditions min typ max unit detection voltage v det1 overcharge detection voltage v det1 0.015 v det1 v det1 +0.015 v v hys1 overcharge hysteresis voltage v hys1 0.020 v hys1 v hys1 +0.020 v v det2 overdischarge detection voltage v det2 0.035 v det2 v det2 +0.035 v v det2 v rel2 v rel2 0.050 v rel2 v rel2 +0.050 v v rel2 overdischarge release voltage v det2 = v rel2 v rel2 0.035 v rel2 v rel2 +0.035 v v det3 discharge overcurrent detection voltage v dd =3.5v v det3 0.010 v det3 v det3 +0.010 v v det4 charge overcurrent detection v dd =3.5v 0.12 0.10 0.08 v v short load shortcircuiting detection voltage v dd =3.5v 0.40 0.50 0.60 v detection delay time table 2 delay time (1) t vdet1 output delay time of overcharge 0.8 1.0 1.2 s t vdet2 output delay time of overdischarge 100 125 150 ms t vdet3 output delay time of discharge over current v dd =3.5v 6.4 8.0 9.6 ms t vdet4 output delay time of charge over current v dd =3.5v 6.4 8.0 9.6 ms t short output delay time of load shortcircuiting detection v dd =3.5v 320 400 480 us detection delay time table 2 delay time (2) t vdet1 output delay time of overcharge 0.96 1.2 1.44 s t vdet2 output delay time of overdischarge 120 150 180 ms t vdet3 output delay time of discharge over current v dd =3.5v 7.2 9.0 10.8 ms t vdet4 output delay time of charge over current v dd =3.5v 7.2 9.0 10.8 ms t short output delay time of load shortcircuiting detection v dd =3.5v 240 300 360 us absolute maximum ratings applying any over absolute maximum ratings practi ce can permanently damage the device. these data ar e indicated the absolute maximum values only but not implied an y operating performance. electrical characteristics (for liion) (ta = 25 )
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 7 of 22 4j03n-rev.f002 symbol item conditions min typ max unit current consumption (power-down function enabled) v dd operating input voltage v dd - v ss 2.0 6.0 v i dd supply current v dd =3.5v, v-=0v 1.0 3.0 5.5 ua i standby power-down current (power-down function enabled ic only) v dd =1.8v, v- floating 0.1 ua 0v battery charging function v 0cha 0 v battery charge starting charger voltage 0 v battery charging function available 0.5 1.0 1.5 v v 0inh 0v battery charge inhibition battery voltage 0 v battery charging function unavailable (vcharger=4v~14v) 0.5 1.0 1.5 v output resistance r coh co pin h resistance v co =3.0v, v dd =3.5v, v-=0v 1.25 2.50 5.00 k r col co pin l resistance v co =0.5v, v dd =4.5v, v-=0v 0.75 1.50 3.00 k r doh do pin h resistance v do =3.0v, v dd =3.5v, v-=0v 1.25 2.50 5.00 k r dol do pin l resistance v do =0.5v, v dd =1.8v, v-=0v 1.75 3.50 7.00 k v- internal resistance r vmd internal resistance between v- and v dd v dd =1.8v, v-=0v 100 300 900 k r vms internal resistance between v- and v ss v dd =3.5v, v-=1.0v 50 100 300 k (continued)
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 8 of 22 4j03n-rev.f002 symbol item conditions min typ max unit detection voltage v det1 over-charge detection voltage -- v det1 -0.025 v det1 v det1 +0.025 v v hys1 over-charge hysteresis voltage -- v hys1 -0.030 v hys1 v hys1 +0.030 v v det2 over-discharge detection voltage -- v det2 -0.050 v det2 v det2 +0.050 v v det2 v rel2 v rel2 -0.080 v rel2 v rel2 +0.080 v v rel2 over-discharge release voltage v det2 = v rel2 v rel2 -0.050 v rel2 v rel2 +0.050 v v det3 discharge over-current detection voltage v dd =3.5v v det3 -0.015 v det3 v det3 +0.015 v v det4 charge over-current detection v dd =3.5v -0.13 -0.10 -0.07 v v short load short-circuiting detection voltage v dd =3.5v 0.35 0.50 0.65 v detection delay time table 2 delay time (1) t vdet1 output delay time of over-charge - 0.7 1.0 1.3 s t vdet2 output delay time of over-discharge - 88 125 163 ms t vdet3 output delay time of discharge over current v dd =3.5v 5.0 8.0 11.0 ms t vdet4 output delay time of charge over current v dd =3.5v 5.0 8.0 11.0 ms t short output delay time of load short-circuiting detection v dd =3.5v 280 400 520 us detection delay time table 2 delay time (2) t vdet1 output delay time of over-charge - 0.84 1.2 1.56 s t vdet2 output delay time of over-discharge - 105 150 195 ms t vdet3 output delay time of discharge over current v dd =3.5v 6.0 9.0 12.0 ms t vdet4 output delay time of charge over current v dd =3.5v 6.0 9.0 12.0 ms t short output delay time of load short-circuiting detection v dd =3.5v 210 300 390 us electrical characteristics (for liion) (ta = 10 o c to +60 o c)*
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 9 of 22 4j03n-rev.f002 current consumption (power-down function enabled) v dd operating input voltage v dd C v ss 2.0 6.0 v i dd supply current v dd =3.5v, v-=0v 1.0 3.0 6.0 ua i standby power-down current (power-down function enabled ic only) v dd =1.8v, v- floating 0.1 ua 0v battery charging function v 0cha 0 v battery charge starting charger voltage 0 v battery charging function available 0.3 1.0 1.7 v v 0inh 0v battery charge inhibition battery voltage 0 v battery charging function unavailable 0.3 1.0 1.7 v output resistance r coh co pin h resistance v co =3.0v, v dd =3.5v, v-=0v 1.00 2.50 5.00 k r col co pin l resistance v co =0.5v, v dd =4.5v, v-=0v 0.60 1.50 3.00 k r doh do pin h resistance v do =3.0v, v dd =3.5v, v-=0v 1.00 2.50 5.00 k r dol do pin l resistance v do =0.5v, v dd =1.8v, v-=0v 1.40 3.50 7.00 k v- internal resistance r vmd internal resistance between v- and v dd v dd =1.8v, v-=0v 78 300 900 k r vms internal resistance between v- and v ss v dd =3.5v, v-=1.0v 26 100 300 k (continued) *: the specification for this temperature range is guaranteed by design because products are not scree ned at high to low temperature.
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 10 of 22 4j03n-rev.f002 test circuits over-charge, over-discharge and the release detect ion voltages (test circuit 1) 1) set v1=3.5v, v2=0v, s1=on and s2=off, then ec 9528a series enters operating mode. 2) increase v1 voltage (from 3.5v) gradually. th e v1 voltage is the over-charge detection voltage ( v det1 ) when co pin goes low (from high). 3) decrease v1 gradually. the voltage gap is the over-charge hysteresis detection voltage (v hys1 ) when co pin goes high again. 4) continue decreasing v1. the v1 voltage is the over-discharge detection voltage (v det2 ) when do pin goes low. then increase v1gradually. the v1 voltage is the over-discharge release detection voltage (v rel2 ), when do pin returns to high. note: the over-charge and over-discharge rel ease voltages are defined in versions. discharge over-current detection voltage (test circuit 1) 1) set v1=3.5v, v2=0v, s1=on and s2=off and ec95 28a series enters operating condition. 2) increase v2 (from 0v) gradually. the v2 volta ge is the discharge over-current detection voltage (v det3 ) when do pin goes low (from high). charge over-current detection voltage (test circuit 1) 1) set v1=3.5v, v3=0v, s1=off and s2=on and ec95 28a series enters operating condition. 2) increase v3 gradually. the v3 voltage is the charge over-current detection voltage (v det4 ) when co pin goes low (from high). load short-circuiting detection voltage (test circuit 1) 1) set v1=3.5v, v2=0v, s1=on and s2=off and ec95 28a series enters operating condition. 2) increase v2 immediately (within 10us) till do pin goes low from high with a delay time which i s between the minimum and the maximum of load short-circui ting delay time. over-charge, over-discharge delay time (test circuit 1) 1) set v1=3.5v, v2=0v, s1=on and s2=off to enter operating condition. 2) increase v1 from vdet1-0.2v to vdet1+0.2v imm ediately (within 10us). the over-charge detection d elay time (tvdet1) is the period from the time v1 gets to v det1 +0.2v till co pin switches from high to low. 3) set v1=3.5v, v2=0v, s1=on and s2 = off to ent er operating condition. 4) decrease v1 from v det2 +0.2v to v det2 -0.2v immediately (within 10us). the over-discharge detection delay time (tv det2 ) is the period from the time v1 gets to v det2 -0.2v till do pin switches from high to low. discharge over-current delay time (test circuit 1) 1) set v1=3.5v, v2=0v, s1=on and s2=off to enter operating condition. 2) increase v2 from 0v to 0.25v immediately (wit hin 10us). the discharge over-current detection del ay time (tv det3 ) is the period from the time v2 gets to 0.25v ti ll do pin switches from high to low. charge over-current delay time (test circuit 1) 1) set v1=3.5v, v3=0v, s1=off and s2=on to enter operating condition. 2) increase v3 from 0v to 0.3v immediately (with in 10us). the charge over-current detection delay t ime (tv det4 ) is the period from the time v3 gets to 0.3v till co pin gets to low from high.
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 11 of 22 4j03n-rev.f002 load short-circuiting delay time (test circuit 1) 1) set v1=3.5v, v2=0v, s1=on and s2=off to en ter operating condition. 2) increase v2 from 0v to 1.0v immediately (w ithin 10us). the load short-circuiting detection vo ltage delay time (tshort) is the period from the time v2 g ets to 1.0v till do pin switches from high to low. operating & power down current consumption (test circuit 2) 1) set v1=3.5v, v2=0v and s1=on to enter opera ting condition and measure the current i1. i1 is th e operating condition current consumption (i dd ). 2) set v1=v2=1.8v and s1=on enter over-dischar ge condition and measure current i1. i1 is the powe r down current consumption (i standby ). resistance between v- and vdd, v- and vss (test circuit 2) 1) set v1=1.8v, v2=0v and s1=on and ec9528a series enters over-discharge condition. v1/i2 is the inte rnal resistance between v- and v dd pin (r vmd ). 2) set v1=3.5v, v2=1.0v and s1=on and ec9528a s eries enters discharge over-current condition. v2/i 2 is the internal resistance between v- and v ss pin (r vms ). output resistance (test circuit 3) 1) set v1=3.5v, v2=0v, v3=3.0v, s1=off and s2=on to enter operating condition. (v3-v1)/i2 is the in ternal resistance (r coh ). 2) set v1=4.5v, v2=0v, v3 =0.5v, s1=off and s2=o n to enter over-charge condition. v3/i2 is the inte rnal resistance (r col ). 3) set v1=3.5v, v2=0v, v3=3.0v, s1=on and s2=off to enter operating condition. (v3-v1)/i2 is the in ternal resistance (r doh ). 4) set v1=1.8 v, v2=0v, v3 =0.5v, s1=on and s2=o ff to enter over-discharge condition. v3/i2 is the internal resistance (r dol ). 0v battery charge starting charger voltage (product s with 0v battery charging function is available) (test circuit 4) 1) set v1=v2=0v, increase v2 gradually. 2) the v2 voltage is the 0v charge starting volt age (v 0cha ) when co pin switches from low to high (v v - + 0.1v or higher). 0v battery charge inhibition battery voltage (produ cts with 0v battery charging function is unavailab le) (test circuit 4) 1) set v1=1.6v, v2=-4v then decrease v1 graduall y. 2) the v1 voltage is the 0v charge inhibition vo ltage (v 0inh ) when co pin switches from low to high (v v- + 0.1v or higher). note: the charger voltage should not be higher than 14v of 0v battery charge inhibition battery voltage. shorten mode for overcharge and overdischarge funct ions by force voltage to dout pin (test circuit 5) 1) set v1=3.5v then nt1713 series enters operati ng mode. 2) set v2= 0.5v, increase v1 voltage (from 3.5v) gradually. the v1 voltage is the over-charge detec tion voltage (v det1 ) when co pin goes low (from high). 3) decrease v1 gradually. the voltage gap is the over-charge hysteresis detection voltage (v hys1 ) when co pin goes high again. 4) continue decreasing v1. the v1 voltage is the over-discharge detection voltage (v det2 ) when the voltage
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 12 of 22 4j03n-rev.f002 drop(vr1k*i1) on do pin by shorten mode circ uit. then increase v1 gradually. the v1 voltage is the over-discharge release detection voltage (v rel2 ), when do pin returns to high. recommended: 1) '0 v charge available' doesn't means ec9528a ser ies can recover the zero-v cell to be full charged if this cell has been already damaged due to too low voltage. 2) in ec9528a series, the '0 v charge inhibition ' voltage is rather lower (0.5v). that is, ec9528a series allow charging such low voltage cell and recover it. 3) for safety consideration, we strongly recomme nded to select '0 v charge inhibition' to prevent f rom charging a damaged cell.
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 13 of 22 4j03n-rev.f002 test circuit
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 14 of 22 4j03n-rev.f002 operation the ec9528a series provides over-charge, over-disch arge, discharge over-current, charge over-current a nd load short-circuiting protections for the 1-cell battery pack. ec9528a series continuously monitors the vol tage of battery between v dd pin and v ss pin to control over-charge and over-discharge prot ections. when the battery pack is in charging stage, the current flows from the charger to the battery through eb+ and eb-; the voltage bet ween v- pin and v ss pin is negative. on the other hand, when the batte ry pack is in discharging stage, the current flows from battery to the load through eb+ and eb-; the v oltage between v- pin and v ss pin is positive. the ec9528a series also monitors the voltage which is determine d by the current of charge and discharge and the se ries rds(on) of mosfets between v- pin and v ss pin to detect charge over-current and discharge ov er-current current conditions. (1) normal condition (operation mode) the ec9528a series turns both the charging and disc harging control mosfets on when the voltage of batt ery is in the range from over-charge detection voltage (v det1 ) to over-discharge detection voltage (v det2 ), and the vm pin voltage is in the range from over-current de tection voltage (v det4 ) to discharge over-current detection voltage (v det3 ). this is called the normal condition that chargin g and discharging can be carried out freely. caution: the ec9528a series may be needed connecting a charger to retur n to normal condition, when the battery is connected for the first time. (2) over-charge condition 1) over-charge protection: when the v dd voltage is higher than the over-charge detection v oltage (v det1 ) and lasts for longer than the over- charge detection delay time (tv det1 ), ec9528a series turns off the external charging m osfet to protect the pack from being over-charged, which co pin turns to l from h level. 2) over-charge protection release: when the battery voltage is lower than v det1 - v hys1 and the v- pin voltage is between charge over-curre nt detection voltage (v det4 ) and discharge over-current detection voltage (v det3 ), the ec9528a series would be automatically released from this condition. when the battery voltage is lower than v det1 and charger is removed, the ec9528a series can be automatically released from this condition. (3) over-discharge condition 1) over-discharge protection: when the v dd voltage is lower than the over-discharge detection voltage (v det2 ) and lasts longer than over- discharge detection delay time (tv det2 ), ec9528a series turns off the external discharge mosfet to protect the pack from being over-discharged, which do pin tur ns to l from h level. in over-discharge conditi on v- pin is pulled-up to v dd by a resistor (rvmd) between the v- pin and v dd pin. after that, when v- pin voltage is higher tha n v dd /2(typ), the ic gets to power down mode. 2) over-discharge protection release: the over-discharge protection is automatical ly released when (a) a charger is connected and v- pin voltag e is lower than C0.7v (typ.) and battery voltage is higher than the over- discharge voltage, or (b) a charger is connected, and v- pin volta ge is higher than C0.7v (typ.) and battery voltage is higher than the over- discharge release voltage.
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 15 of 22 4j03n-rev.f002 (4) discharge over-current condition 1) discharge over-current protection: the ec9528a series provides discharge over-c urrent protection and load short-circuiting protect ion: (a) discharge over-current protection occurs when v- pin voltage is between v det3 and v short and lasts for a certain delay time (tv det3 ). (b) load short-circuiting protection occurs when v- pin voltage is higher than v short and lasts for a certain delay time (tshort). when above conditions happen, the do pin goes l from h to turn off the disch arging mosfet. in discharge over-current and load short-c ircuiting conditions, v- pin is pulled-down to vss pin by the internal resistor (rvms). 2) discharge over-current and load short-circuit ing protection release: the ic detects the status by monitoring v- p in voltage that is inversely proportional to the im pedance (rload) between two terminals (eb+ and eb-). the rload incre ases while the v- pin voltage decreases. when the v - pin voltage equals to v short or lower, discharge over-current status returns to normal mode and the circuit will be automatic recovery. the relation between v- and rload is shown as follows: (5) charge over-current condition the ec9528a series provides charge over-current pro tection to prevent the battery pack from being conn ected to an unexpected charger. 1) charge over-current protection when the voltage of v- pin is lower than ch arge over-current detection voltage (v det4 ) and lasts for a certain delay time (tdet4) or longer, the co pin goes l from h to turn off the charging mosfet. 2) charge over-current release: charge over-curr ent protection can be automatically released by dis connecting the charger. (6) power down condition 1) entering to power down mode: ec9528a series enters the power down mode when over -discharge protection occurs and v- pin voltage is higher than v dd /2 (typical). the v- pin voltage is pulled-up to th e v dd through the rvmd resistor. the internal circuits i s shut off, therefore, the power-down current (i standby ) is reduced to be low 0.1ua (max.). 2) power down mode release: the power down mode is automatically released when a charger is connected and v- pin voltage is lower than v dd /2 (typical). note: power down condition is for power down mode e nabled version only. remark: neotec provides the test mode on the do pin by vdd+ 0.5v, to reduce over-charge and over-discharge dela y time.
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 16 of 22 4j03n-rev.f002 timing chart (1) over-charge, charge over-current operation (a) normal condition (b) over-charge condition *: the charger is assumed to charge with a constant current.
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 17 of 22 4j03n-rev.f002 (2) over-discharge, discharge over-current, load sh ort-circuiting operation (a) normal condition (b) over-discharge condition (c) discharge over-current condition (d) load short-circuit condition *: the charger is assumed to charge with a constant current.
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 18 of 22 4j03n-rev.f002 recommended application circuit table1 constant for external components
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 19 of 22 4j03n-rev.f002 *1) if the threshold voltage of fet is lower than 0 .4v, the fet may failed to stop the charging curren t. if the fet has a threshold voltage equal to or higher than the over-discharge detection voltage, discharging may b e stopped before over-discharge is detected. if the charger vol tage is higher than the withstanding voltage betwee n the gate and source, the fet may be damaged. *2) employing an over-specification (listed in abov e table) r1 may result in over-charge detection vol tage and release voltage higher than the defined voltage if r1 has a higher resistance, the ic may be damaged cau sed by over absolute maximum rating of v dd voltage when a charger is connected reversely. *3) applying a smaller capacitance c1 to system, do may failed to function when load short-circuiting is detected. *4) r1 and r2 resistors are current limit resistanc e for a charger connected reversibly or a large vol tage charger that exceeds the absolute rating for v cc is connected, when we connect reverse charger the current flows from charger to r2, internal esd diode and r1. this current wi ll increase r1 voltage drop. which can exceed v cc (max). in this case better to use smaller value for r1 and bigger value for r2. but small value of r1 will reduce r-c filter performance and system esd reliability. too big value of r2 ca n cause over-current automatic release problem.if r 2 resistance is higher than 2k , the charging current may not be cut when a high-v oltage charger is connected. *5) as followed this recommended table, the system esd level could be reached at least 12kv. we can i mprove system esd by connect c2 ~ c5 capacitor of 0.1uf. bot h c2 and c3 are protected mosfet from being assault ed by system esd. c4 and c5 are improved system esd and red uce imported noise by load. caution: 1) the above constants may be changed without notic e. 2) the application circuit above is for reference o nly. to determine the correct constants, evaluation of actual application is required. precautions: 1) the application condition for the input voltage, output voltage, and load current should not exceed the package power dissipation. 2) do not apply an electrostatic discharge to this ic that exceeds the performance ratings of the buil t-in electrostatic protection circuit.
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 20 of 22 4j03n-rev.f002 package information
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 21 of 22 4j03n-rev.f002
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 22 of 22 4j03n-rev.f002
ec9528a protection ic for 1-cell battery pack e-cmos corp. ( www.ecmos.com.tw ) page 23 of 22 4j03n-rev.f002

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Price & Availability of EC9528A-XXXF4R

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