mitsumi protection for lithium-ion batteries (for double protection) mm3284 series protection for lithium-ion batteries (for double protection) monolithic ic mm3284 series outline this ic is a double protection ic for lithium battery of 1-cell to 4-cell. it detects the battery voltage for every cell. it includes a timer, eliminating an external capacitor for overcharge detection delay that is used for our conventional ics, which allows programmable detection delay time. features 1. overcharge detection voltage 4.0~4.5v accuracy ?0mv ( - 40~85?) 2. current consumption (v cell =3.5v) 2.5? typ. 3. current consumption (v cell =2.5v) 2.0? typ. 4. maximum rating 28v 5. operating voltage range: 2~24v 6. no external capacitance required for delay time (delay time is determined by the internal circuit, ranging from 1s to 12s upon request) packages sot-26a sson-6a applications 1. laptop pcs 2. battery powered device line-up mitsumi model overcharge detection overcharge release overcharge detection voltage hysteresis voltage dead time mm3284a 4.350?.03v 200?0mv 1.2s typ. mm3284b 4.350?.03v 1000?00mv 1.2s typ. MM3284C 4.350?.03v 1000?00mv 10.0s typ. mm3284e 4.450?.03v 200?0mv 1.2s typ. mm3284g 4.450?.03v 1000?00mv 10.0s typ. mm3284h 4.350?.03v 1000?00mv 5.0s typ. mm3284i 4.450?.03v 1000?00mv 5.0s typ. mm3284j 4.400?.03v 1000?00mv 10.0s typ.
mitsumi protection for lithium-ion batteries (for double protection) mm3284 series mitsumi block diagram v1 vss ov output control v2 v3 v dd overcharge detection counter oscillator overcharge detection overcharge detection overcharge detection pin assignment 1 2 3 6 5 4 ov v2 v3 vdd vss v1 sson-6a (top view) 1 vdd 2 v3 3 v2 4 v1 5 vss 6 ov
mitsumi protection for lithium-ion batteries (for double protection) mm3284 series pin description pin no. pin name input/output functions 1 vdd input the input terminal of the power supply for ic and of the positive voltage for v4 cell. 2 v3 input the input terminal of the positive voltage for v3 cell and of the negative voltage for v4 cell. 3 v2 input the input terminal of the positive voltage for v2 cell and of the negative voltage for v3 cell. 4 v1 input the input terminal of the positive voltage for v1 cell and of the negative voltage for v2 cell. 5 vss input the input terminal of the ground of ic and of the negative voltage for v1 cell. the output terminal of over-charge detection. output type is cmos. 6 ov output ?normal mode : "low" ?overcharge mode : "high" absolute maximum ratings (ta=25?) item symbol ratings unit storage temperature range t stg - 5~+125 ? operating temperature range t opr - 40~+110 ? supply voltage v ddmax. vss - 0.3~vss+28 v ov pin input voltage v omax. vss - 0.3~vdd+0.3 v allowable loss pd 150 mw recommended operating conditions (ta=25?) item symbol ratings unit operating temperature range t opr - 40 ~ +110 ? operating voltage range v opr vss+2.0 ~ vss+24 v
mitsumi protection for lithium-ion batteries (for double protection) mm3284 series electrical characteristics (except where noted otherwise, ta=25?, v cell =3.5v) item symbol measurement conditions min. typ. max. unit measuring circuit consumption current 1 i dd1 v cell =3.5v, i out =0ma 2.5 5 a a consumption current 2 i dd2 v cell =2.3v, i out =0ma 2 4 ? a v3 pin input current i v3 v cell =3.5v - 300 300 na a v2 pin input current i v2 v cell =3.5v - 300 300 na a v1 pin input current i v1 v cell =3.5v - 300 300 na a overcharge detection v cell u ta=0~+50? * 1 voltage v cell =3.5v 4.5v 4.320 4.350 4.380 v b overcharge detection v cell u ta= - 40~+85? * 1 voltage v cell =3.5v 4.5v 4.300 4.350 4.400 v b overcharge detection v cell u ta= - 40~+110? * 1 voltage v cell =3.5v 4.5v 4.270 4.350 4.430 v b overcharge release v cell ov cell =4.5v 3.5v v cell uv cell uv cell u vb voltage 1.2v 1.0v 0.8v overcharge detection t ov v cell =3.5v 4.5v 7.0 10.0 13.0 s b dead time ov pin source current i so o v v cell >v cell u v ov =v in - 0.5v 20 ? c ov pin sink current i si o v v ov =0.5v ta= - 40~110? * 1 20 ? c v cell >v cell u ov pin output v th o v hv in - v ov 0.5 v d voltage h i so =20? v ov - v ss ov pin output v th o v li so = - 20? 0.5 v d voltage l ta= - 40~110? * 1 voltage of delay v ds v cell =6v 8v 6.0 7.0 8.0 v b time shortening note1: * 1 guaranteed value
mitsumi protection for lithium-ion batteries (for double protection) mm3284 series measuring circuit a ov v2 v3 vdd vss v1 a a a oscilloscope ov v2 v3 vdd vss v1 v v v v ov v2 v3 vdd vss v1 a v p+ p- sc protector vdd v3 v2 v1 vss ov 1k ? 1k ? 1k ? 330 ? 0.1 f 0.1 f 0.1 f 0.1 f a. b. c. d.
mitsumi protection for lithium-ion batteries (for double protection) mm3284 series timing chart normal mode overcharge mode normal mode normal mode normal mode normal mode overcharge mode overcharge mode overcharge mode t ov t ov t ov t ov connect charger connect charger connect charger connect charger connect load connect load connect load connect load v cell u v cell o v dd v ss v1 cell ov v2 cell v3 cell v4 cell
mitsumi protection for lithium-ion batteries (for double protection) mm3284 series mitsumi application circuit p+ p- sc protector vdd v3 v2 v1 vss ov 1k ? 1k ? 1k ? 330 ? 0.1 f 0.1 f 0.1 f 0.1 f 1. use for 4 cells p+ p- sc protector vdd v3 v2 v1 vss ov 1k ? 1k ? 330 ? 0.1 f 0.1 f 0.1 f 2. use for 3 cells p+ p- sc protector vdd v3 v2 v1 vss ov 1k ? 330 ? 0.1 f 0.1 f 3. use for 2 cells p+ p- sc protector vdd v3 v2 v1 vss ov 330 ? 0.1 f p+ p- sc protector vdd v3 v2 v1 vss ov 1k ? 1k ? 330 ? 0.1 f 0.1 f 0.1 f p+ p- sc protector vdd v3 v2 v1 vss ov 1k ? 330 ? 0.1 f 0.1 f p+ p- sc protector vdd v3 v2 v1 vss ov 330 ? 0.1 f 4. use for 1 cell * the fixed number is reference value. example 1 example 2 example 1 example 2 example 1 example 2 when the battery is connected, 0v and vss are short-circuited by the jumper, and we recommend the method of removing the jumper that is short-circuited of 0v and vss when the connection of all cells is completed.
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