mitsumi protection of lithium ion batteries (one cell) mm1301 protection of lithium ion batteries (one cell) monolithic ic mm1301 outline this ic provides protection for the mm1291 series of compact, high-precision type lithium ion batteries which have been in use for some time. precision of 30mv is guaranteed between 0c and +50c, and this ic can be used in applications where precision is crucial. features 1 overcharge detection voltage ta=0~+50c v cel 30mv 2 overcharge detection delay time c td =0.082f 1.0s typ. 3 current consumption (normal operation v cel =3.5v) 10a typ. 4 current consumption (overdischarge operation v cel =1.9v) 0.7a typ. 5 overcurrent cancel conditions load removed : load of 5m or greater across battery pack terminals package vsop-8a applications lithium ion battery pack (for battery protection) 1-cell protection ics package overcharge overdischarge release overcurrent detection detection hysteresis dead time detection voltage delay sop-8 vsop-8 voltage overcurrent detec time shot-mode mm1301 aw 4.27v 200mv 2.3v 2.9v 100mv 0.9v bw 4.17v 100mv 2.3v 2.9v 100mv 0.9v cw 4.18v 100mv 2.3v 2.9v 125mv 0.45v dw 4.28v 220mv 2.3v 2.9v 50mv 0.45v ef 4.20v 100mv 2.3v 2.9v 125mv 0.45v fw 4.28v 100mv 2.3v 2.9v 50mv 0.45v gw 4.18v 220mv 2.3v 2.9v 125mv 0.45v hw 4.35v 220mv 2.3v 2.9v 50mv 0.45v jw 4.20v 220mv 2.3v 2.9v 125mv 0.45v at ctd= 0.082f min. 0.5s typ. 1s max. 1.5s min. 5ms typ. 10ms max. 15ms min. 5ms typ. 10ms max. 15ms note : under open-load conditions, returns to normal mode from overcurrent mode. (for mm1291a to g, j, m, 5m or higher; for mm1291h, k, 50m or higher)
mitsumi protection of lithium ion batteries (one cell) mm1301 pin assignment pin description 14 3 2 85 6 7 vsop - 8a 1 gnd 2 gd 3 cs 4 oc 5 n.c 6 td 7 v cc 8 v in pin no. pin name function 1 gnd negative power supply pin also serves as voltage detection pin for battery connected between v in and gnd gate connection pin for discharge-control fet (n-ch) 2 gd turns the gate off in overdischarge mode and overcurrent mode. gate is turned on in overcharge and normal modes. overcurrent detection input pin 3 cs discharge current detected by connection to drain pin of discharge-control fet. discharge current = (cs-gnd voltage)/(fet turn-on resistance) block diagram
mitsumi protection of lithium ion batteries (one cell) mm1301 recommended operating conditions electrical characteristics (except where noted otherwise, ta=25c) item symbol ratings units operating temperature t opr - 20~+70 c operating voltage v op +0.9~+18 v item symbol measurement conditions min. typ. max. units overcharge detection voltage v oc v cc =v in =l h, ta=0~50c 4.15 4.18 4.21 v overcharge release voltage v ocr v cc =v in =h l 4.04 4.09 4.14 v overcharge sensing hysteresis v och =v oc - v ocr v och 60 90 120 mv overdischarge detection voltage v odc 1v cc =v in =h l 2.20 2.30 2.40 v overdischarge release voltage v odr v cc =v in =l h 2.78 2.90 3.02 v overcurrent detection threshold v cs v cs =l h 112 125 138 mv overcurrent short-circuit detection v css 0.35 0.45 0.55 v overcurrent release conditions load open : load of 5m or greater across battery pack terminals consumption current 1 (normal mode) (i s 1=i cc +i in ) i s 1v cc =v in =3.5v 10.0 14.0 a consumption current 2 (overdischarge mode) i s 2v cc =v in =1.9v 0.7 1.0 a absolute maximun ratings (ta=25c) item symbol ratings units storage temperature t stg - 40~+125 c operating temperature t opr - 20~+70 c power supply voltage v cc max. - 0.3~+18 v oc pin voltage v oc max. cs pin voltage v cs max. - 0.6~v cc v allowable loss pd 300 mw 4 oc overcharge detection output pin on overcharge, an external transistor is driven to turn off the charge-control fet (n-ch) 5 n.c 6 td overcharge detection dead time setting pin 7 v cc positive power supply voltage pin 8 v in voltage detection pin for battery connected between v in and gnd notes : overcharge mode : battery voltage > overcharge detection voltage normal mode : overdischarge detection voltage < battery voltage < overcharge detection voltage, discharge current < overcurrent detection level overdischarge mode : overdischarge detection voltage > battery voltage overcurrent mode : discharge current > overdischarge detection level=cs-gnd voltage > discharge current turn-on resistance (discharge-control fet)
mitsumi protection of lithium ion batteries (one cell) mm1301 timing chart overcharge cutoff voltage overcharge expulsion voltage overdischarge expulsion voltage overdischarge cutoff voltage removing load cell voltage td fet gate (charge control) fet gate (discharge control) normal mode normal mode normal mode overcurrent overcharge mode * 1: the overcurrent short mode delay time (overcurrent delay time 2) is the response time of the ic itself. in actual use, the time required for discharge of the gate capacitance of the discharge-controlling fet is added to this. when excessive currents cause considerable voltage fluctuation, the bias current within the ic may be temporarily turned off, so that the response time is lengthened. the time constant of the capacitance and resistance connected to the power supply pin should be set to at least 100s/v, to limit power supply fluctuations. * 2: use the following formula to calculate the overcharge detection time: overcharge detection dead time t oc = 12.2 c td [s] [where c td is the external capacitance in f] overcurrent detection delay time 1 t cs 1 5.0 10.0 15.0 ms overcurrent detection delay time 2 t cs 2 * 1 30 100 s overdischarge detection delay time t od 5.0 10.0 15.0 ms overcharge detection delay time t oc c td =0.082f * 2 0.5 1.0 1.5 s oc pin output current i oc v cc =v in =4.5v - 30 a gd pin "h" output voltage v gdh v cc =v in =3.5v v cc v cc v (normal mode) - 0.3 - 0.1 gd pin "l" output voltage v gdl 1 v cc =v in =3.5v (overcurrent mode) v cs =0.5v 0.1 0.3 v gd pin "l" output voltage (overdischarge mode) v gdl 2v cc =v in =1.5v 0.2 0.4 v
mitsumi protection of lithium ion batteries (one cell) mm1301 characteristics 50 40 30 20 10 0 1.0 2.0 3.0 4.0 5.0 i cc i in power supply voltage (i cc , v in ) (v) power supply current (i cc , i in ) ( a) 10 1 0.1 0.01 0.001 0.01 0.1 external capacitance (ctd) ( f) overcharge detection time (s) power supply current vs power supply voltage overcharge detection time application circuits
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