mitsumi protection of lithium ion batteries (three four cells in series) mm1414 protection of lithium ion batteries (three four cells in series) monolithic ic mm1414 outline this ic protects lithium ion batteries in the event of overcharge, overdischarge and overcurrent. it has the following two functions: an overcurrent detection function that turns the external fet-sw off when a problem occurs during charging, etc. and excess voltage is impressed on each battery for longer than a certain time, and an overdischarge detection function that turns the external fet-sw off when battery voltage drops below a certain voltage during discharge, in order to prevent battery overdischarge. when these functions operate, the ic is put into low consumption current mode. it also has an overcurrent detection function that turns the fet-sw off when excess current flows due to a short or the like. features 1. consumption current (during overcharge) v cell = 4.4 con = 0v 55? typ. 2. consumption current (normal) v cell = 3.5v con = 0v 15? typ. 3. consumption current (during overdischarge) v cell = 1.9v con = 0v 0.5? typ. 4. consumption current (during overdischarge) v cell = 1.0v con = v cc 0.1? max. 5. overcharge detection voltage (ta = 0? ~ 50?) a, c, d, g; load open 500k ? or more f; load open 1meg ? or more package tsop-20a applications ic for protection of lithium-ion batteries consisting of three or four cells notebook pc lithium - ion battery packs mitsumi model package tsop-20a av 4.350?.025 c 200?0 2.00?.10 3.00?.15 150?5 cv 4.350?.025 c 200?0 2.30?.10 3.00?.15 150?5 mm1414 dv 4.250?.025 c 200?0 2.30?.10 3.00?.15 150?5 fv 4.325?.025 c 200?0 2.30?.10 3.00?.15 100?5 gv 4.295?.025 c 8? 2.30?.10 3.00?.15 150?5 overcharge detection voltage (v) overcharge detection voltage temperature conditions overcharge detection hysteresis voltage (v) overdischarge detection voltage (v) overdischarge resumption voltage (v) overcurrent detection voltage (mv) series table temperature conditions a: ta= - 25 ~ 75?, b: ta=-20 ~ 70?, c: ta=0 ~ 50?, d: ta=0 ~ 40?, e: ta= - 20 ~ 25? april 14, 1999
mitsumi protection of lithium ion batteries (three four cells in series) mm1414 mitsumi block diagram pin assignment 1 ov 11 sel 2 n.c 12 n.c 3 cs 13 con 4 n.c 14 n.c 5 dchg 15 v1 6 n.c 16 v2 7 cdc 17 v3 8 col 18 v4 9 cov 19 n.c 10 gnd 20 v cc tsop-20a 13 68 24 579 10 20 16 13 19 17 15 14 12 18 11
mitsumi protection of lithium ion batteries (three four cells in series) mm1414 pin description pin no. pin name i/o functions overcharge detection output pin 1 ov output npntr open collector output normal: high impedance overcharge: low 2 n.c overcurrent detection pin 3 cs input monitors load current equivalently by the voltage drop between discharge control fet source and drain, and makes dchg pin high when the voltage goes below overcurrent detection voltage, turning off discharge control fet. after overcurrent detection, current flows from this pin and when there is a light load, overcurrent mode is released. this function does not operate in overdischarge mode. 4 n.c discharge control fet (p-ch) drive pin 5 dchg output normal: low overdischarge: high 6 n.c 7 cdc input overdischarge detection dead time setting pin dead time can be set by connecting a capacitor between cdc pin and ground. 8 col input overcurrent detection dead time setting pin dead time can be set by connecting a capacitor between col pin and ground. 9 cov input overcharge detection dead time setting pin dead time can be set by connecting a capacitor between cov pin and ground. 10 gnd input gnd pin 11 sel input 3 cell switch pin sel pin = gnd: 3 cell (connect v1 to gnd) sel pin = v cc : 4 cell 12 n.c discharge fet on/off pin 13 con input con pin low; dchg pin low (normal mode) con pin high; dchg pin high (discharging prohibited) 14 n.c 15 v1 input v1 cell high side voltage input pin 16 v2 input v2 cell high side voltage and v3 cell low side voltage input pin 17 v3 input v3 cell high side voltage and v4 cell low side voltage input pin 18 v4 input v4 cell high side voltage input pin 19 n.c 20 v cc input power supply input pin
mitsumi protection of lithium ion batteries (three four cells in series) mm1414 pin description pin equivalent circuit diagram pin equivalent circuit diagram 1 ; ov 9 ; cov 3 ; cs 11 ; sel 5 ; dchg 13 ; con 7 ; cdc 15 ; v1 8 ; col 16 ; v2
mitsumi protection of lithium ion batteries (three four cells in series) mm1414 pin equivalent circuit diagram pin equivalent circuit diagram 17 ; v3 18 ; v4 absolute maximum ratings item symbol ratings unit storage temperature t stg - 40~+125 c operating temperature t opr - 20~+70 c power supply voltage v cc max. - 0.3~24 v ov pin impressed voltage v ov max. - 0.3~24 v sel pin impressed voltage v sel max. - 0.3~24 v con pin impressed voltage v con max. - 0.3~24 v allowable loss pd 300 mw recommended operating conditions item symbol ratings unit operating temperature t opr - 20~+70 c operating voltage v opr +1.8~+24 v
mitsumi protection of lithium ion batteries (three four cells in series) mm1414 mitsumi electrical characteristics (except where noted otherwise, ta=25?, v cc =v4+v3+v2+v1, v cel =3.5v, con=gnd, sel=v cc ) models listed mm1414g item symbol measurement conditions min. typ. max. unit consumption current (v cc pin) 1 i cc 1v cell =4.4v, con=0v 55 110 ? consumption current (v cc pin) 2 i cc 2v cell =3.5v, con=0v 27 50 ? consumption current (v cc pin) 3 i cc 3v cell =1.8v, con=0v 2 4 ? consumption current (v cc pin) 4 i cc 4v cell =3.5v, con=v cc 12 20 ? consumption current (v cc pin) 5 i cc 5v cell =1.8v, con=v cc 12 a consumption current (v4 pin) 1 i1v4 v cell =4.4v 10 20 ? consumption current (v4 pin) 2 i2v4 v cell =3.5v 8 15 a consumption current (v4 pin) 3 i3v4 v cell =1.8v 2.5 5.0 ? v3 pin input current iv3 v cell =3.5v - 300 0 +300 na v2 pin input current iv2 v cell =3.5v - 300 0 +300 na v1 pin input current iv1 v cell =3.5v - 300 0 +300 na overcharge detection voltage v cell uv cell : 4.2v 4.4v, ta=0~50? 4.270 4.295 4.320 v overcharge hysteresis voltage vu v cell : 4.2v 4.4v 3.9v 8 16 mv overcharge sensing dead time tov cov=0.1? 0.5 1.0 1.5 s overdischarge detection voltage v cell sv cell : 3.5v 1.8v 2.20 2.30 2.40 v discharge resume voltage v cell dv cell : 1.8v 3.5v 2.85 3.00 3.15 v overdischarge hysteresis voltage vds v cell d - v cell s 0.45 0.70 0.95 v overdischarge sensing dead time tcdc cdc=0.1? 0.5 1.0 1.5 s overcurrent detection voltage voc v cc - v cs , dchg 135 150 165 mv overcurrent hysteresis voltage voc 20 40 mv overcurrent sensing dead time 1 tcol1 col=0.001? 5 10 15 ms overcurrent sensing dead time 2 tcol2 col=0.001?, v cc - cs>1.0v 1.5 3.0 ms overcurrent sensing dead time 3 tcol3 col=0.001? 5 10 15 ms overcurrent reset conditions load release conditions 500k ? dchg pin source current i so d ch v cell =1.8v, sw1 : a vdchg=v cc - 0.8v 20 ? dchg pin sink current i si d ch v cell =3.5v, sw1 : a vdchg=0.8v 20 ? dchg pin output voltage h v th d c hv cc - vdchg, i so =20?, sw1 : b 0.8 v dchg pin output voltage l v th d c l vdchg - gnd, i si = - 20?, sw1 : b 0.8 v ov pin sink current i si ov vov=0.4v, ta= - 20~+70 c 100 ? ov pin leak current i lk ov vov=24v 0.1 ? con pin l voltage dchg= "high" 0.4 v con pin h voltage dchg= "low" v cc - 0.4 v con pin current v cell =3.5v, con=0.4v 1 2 ? sel pin l voltage for 3 cell 0.4 v sel pin h voltage for 4 cell v cc - 0.4 v sel pin current v cell =3.5v, sel=0.4v 1 2 ?
mitsumi protection of lithium ion batteries (three four cells in series) mm1414 mitsumi measuring circuit timing chart overcharge detection voltage overcharge release voltage charge off sensing dead normal state overcharge normal state cell voltage cov pin ov pin (for pull up) for overcharge
mitsumi protection of lithium ion batteries (three four cells in series) mm1414 cell voltag con pin cdc pin dchg pin overdischarge detection voltage discharge off charge start discharge resume voltage sensing dead normal state normal state overdischarge normal state external control normal state normal state sensing dead reset dead overcurrent load release current flows from cs pin normal state overcurrent normal state cs pin col pin dchg pin for overdischarge for overcurrent
mitsumi protection of lithium ion batteries (three four cells in series) mm1414 application circuit characteristics 0.001 0.01 0.1 1 10 0.01 0.1 1 pin capacitance ( f) dead time (s) col pin capacitance (pf) 100 10 1 100 1000 10000 dead time (ms) 100 1000 10000 0 1 10 100 col pin capacitance (pf) overcurrent sensing dead time 2 (ms) overcharge & overdischarge sensing dead times overcurrent sensing dead time 1, overcurrent reset dead time 3 overcurrent sensing dead time 2 note: the above characteristics are representative values only, and are not guaranteed. note: applicable circuits shown are typical examples provided for reference purposes. mitsumi cannot assume responsibility for any problems arising out of the use of these circuits or for any infringement of third party patent and other right due to same.
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