mitsumi protection of lithium-ion batteries (for double-protect) MM1451 protection of lithium-ion batteries (for double-protect) monolithic ic MM1451 outline this ic is used for double-protection of lithium-ion batteries with from one to three cells, and has an ultra- compact package. short-circuits between cells accommodate series connections of one to three cells. features 1. overcharge detection voltage accuracy (0c to 50c) 50 mv/cell. 2. consumption current (vcell=3.8v) 3a typ. 3. consumption current (vcell=2.3v) 0.3a typ. 4. pin i/o current between cells (vcell=3.8v) 0.3a max. 5. delay time on overcharge voltage detection (ct=0.22f) 1.5s typ. 6. output current (vcell=v cc =4.5 v) 500a typ. package vsop-8b applications pin assignment ic for double-protection of lithium-ion batteries with one to three cells. 14 3 2 85 6 7 vsop - 8b mitsumi 1 v3 2 v2 3 v1 4 gnd 5 ct 6 n.c 7 out 8 v cc
mitsumi protection of lithium-ion batteries (for double-protect) MM1451 mitsumi block diagram
mitsumi protection of lithium-ion batteries (for double-protect) MM1451 pin description pin no. pin name functions equivalent circuit diagram 1 v3 3-cell power supply 2 v2 2-cell power supply 3 v1 1-cell power supply 5 ct delay capacity pin 7 out out pin
mitsumi protection of lithium-ion batteries (for double-protect) MM1451 absolute maximun ratings (ta=25c) electrical characteristics 1 (except where noted otherwise, ta=25c, v cel =v3 - v2=v2 - v1=v1 - gnd, v cc =3 v cel ) electrical characteristics 2 (except where noted otherwise, ta=25c, v cel =v3-v2=v2-v1=v1-gnd, v cc =3 v cel ) item symbol ratings unit operating temparature t opr - 20~+80 c storage temparature t stg - 40~+125 c v cc input voltage v cc v1 input voltage * 1 v1 - 0.3~18 v v2 input voltage * 1 v2 v3 input voltage * 1 v3 ct pin voltage * 2 v ct - 0.3~18 v v out pin voltage v out - 0.3~18 v allowable loss pd 170 mw note 1 : * 1 18v > = v3 > = v2 > = v1 > = - 0.3 note 2 : * 2 do not impress current of 300a or more on the ct pin. item symbol measurement conditions min. typ. max. unit current consumption 1 i 1 v cel =3.8v 3.0 6.0 a current consumption 2 i 2 v cel =2.3v 0.3 0.5 a pin i/o current between cells i 3 v cel =3.8v (between v3, v2, v1) 0.0 0.3 a overcharge detection voltage v s v cel =l h ta= - 20~+70c 4.400 4.450 4.500 v hysterisis voltage hys v cel =l h l 35 50 65 mv overcharge detection delay time t plh ct=0.22f 1.0 1.5 2.0 s output current i oh v cel =v cc =4.5v v o =3v 100 500 a item symbol measurement conditions min. typ. max. unit current consumption 1 i 1 v cel =3.8v, v cc =v cel 3 3.0 6.0 a current consumption 2 i 2 v cel =2.3v, v cc =v cel 3 0.3 0.5 a pin i/o current between cells i 3 v cel =3.8v (between v3, v2, v1) 0.0 0.3 a overcharge detection voltage v s v cel =l h ta= - 20~+70c 4.400 4.450 4.500 v hysterisis voltage hys v cel =l h l 35 50 65 mv overcharge detection delay time t plh ct=0.22f 1.0 1.5 2.0 s output current i oh v cel =v cc =4.6v v o =3v 100 500 a output leakage current i leak v cel =3.8v, v cc =18v 0.1 a
mitsumi protection of lithium-ion batteries (for double-protect) MM1451 mitsumi electrical characteristics 3 (except where noted otherwise, ta=25c, v cel =v3-v2=v2-v1=v1-gnd, v cc =3 v cel ) item symbol measurement conditions min. typ. max. unit current consumption 1 i 1 v cel =3.8v, v cc =v cel 3 2.5 3.5 a current consumption 2 i 2 v cel =3.8v, v cc =v cel 3 1.5 2.5 a current consumption 3 i 3 v cel =2.3v, v cc =v cel 3 0.15 0.3 a current consumption 4 i 4 v cel =2.3v, v cc =v cel 3 0.1 0.2 a pin i/o current between cells i 3 v cel =3.8v (between v3, v2, v1) 0.0 0.3 a overcharge detection voltage v s v cel =l h ta= - 20~+70c 4.400 4.450 4.500 v hysterisis voltage hys v cel =l h l 35 50 65 mv overcharge detection delay time t plh ct=0.22f 1.0 1.5 2.0 s output current i oh v cel =v cc =4.6v v o =3v 100 500 a output leakage current i leak v cel =3.8v, v cc =18v 0.1 a measuring circuit
mitsumi protection of lithium-ion batteries (for double-protect) MM1451 mitsumi timing chart 4.45v 4.40v 1.5s 1.8v 0.6v out (at ct short) (at ct open) out ct v1~v3 application circuit delay time td(s) = 7 cct (f) note 1: can support 1, 2 or 3 cells by shorting each cell. however, be sure to connect a battery for v3 cell. v3 cell may not operate correctly when shorted. note 2: when connecting batteries, be sure to connect in the following order: gnd v3, and v cc v1or v2. note 3: output may go on momentarily when starting up power supply. if this error output during startup becomes a problem, connect the v cc pin last. note 4: operation can not be guaranteed for connections other than the above. note: output goes low simultaneously with overcharge detection at ct pin short and open.
mitsumi protection of lithium-ion batteries (for double-protect) MM1451 characteristics input voltage (no delay) (v) 6 5 4 3 2 1 0 0123 4.400 4.450 output voltage (v) temperature ( c) 2.5 3.0 2.0 1.5 1.0 0.5 0.0 - 25 25 75 2200p pm 2200ppm - 500p pm - 500ppm delay time (s) detection voltage output delay time 5 6 4 3 2 1 0 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 cell voltage (v) consumption current ( a) consumption current cell voltage (v) 0.2 0.3 0.1 0 - 0.1 - 0.2 - 0.3 0 0.5 1 1.5 2 2.5 3 3.5 4 4.5 pin i/o current between cells ( a) pin i/o current between cells
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