MM3725/MM3726 Series
1 cell lithium–ion/lithium–polymer battery protection IC
Outline
The MM3725/MM3726 series are protection IC using high voltage
CMOS process for overcharge, overdischarge andovercurrent
protection of the rechargeable Lithium-ion or Lithium-polymer
battery. The overcharge, overdischarge,discharging overcurrent,
charging overcurrent, and short protection of the rechargeable
one-cell Lithium-ion or Lithium-polymer battery can be detected.
Each of these IC composed of four voltage detectors, short
detection circuit, referencevoltage sources, oscillator, counter
circuit and logical circuits.
Features
(Unlessꢀotherwiseꢀspecified,ꢀTa=25°C)
(1) Range and accuracy of detection/release voltage
Overcharge detection voltage............................Vdet1 ................................................. 3.6V to 5.0V................... ±20m
5mVstep ........................ ±25mV
(Ta=-20 to 60°C)
Overcharge release voltage ...............................Vrel1................................................... Vdet1-0.2V to Vdet1...... ±30mV
5mV step
Overdischarge detection voltage.......................Vdet2 ................................................. 2.0V to 3.0V................... ±35m
50mV step
Overdischarge release voltage...........................Vrel2................................................... 2.0V to 3.0V................... +50 / -35mV
(In case Vdet2=Vrel2)
50mV step ..................... +90 / -65mV
ꢀ
ꢀ
ꢀ
(InꢀcaseꢀVdet2≠Vrel2)
Discharging overcurrent detection voltage........Vdet3 ................................................. 20mV to 300mV............. ±5mV
1mV step
Charging overcurrent detection voltage.............Vdet4 ................................................. -300mV to -20mV.......... ±5mV
1mV step
Short detection voltage......................................Vshort ................................................ 40mV to 350mV............. ±8%
1mV step
0V battery charge inhibition battery voltage ......Vst ..................................................... 1.3V to 1.8V/0.1V step... ±100mV
0.9V ............................... ±300mV
(2) Range of detection delay time
Overcharge detection delay time.......................tVdet1................................................ 256ms to 4.6s
Overdischarge detection delay time ..................tVdet2................................................ 8ms to 256ms
Discharging overcurrent detection delay time ...tVdet3................................................ 8ms to 256ms
Charging overcurrent detection delay time........tVdet4................................................ 6ms to 64ms
Short detection delay time.................................tVshort............................................... 250µs to 400µs
(3) Current consumption
Normal mode ....................................................Typ. 3.0µA, Max. 6.0µA
Stand-by mode..................................................Max. 0.1µA (In case Overdischarge latch function Enable)
Max 0.6µA (In case Overdischarge latch function Disable)
4) 0V battery Charge function.....................................Selectable “Permission” or “Prohibition”
5) Absolute maximum ratings
VDD pin..............................................................VSS–0.3V to +12V
COUT pin and V- pin .........................................VDD–28V to VDD+0.3V
DOUT pin and CS pin .......................................VSS–0.3V to VDD+0.3V
Storage temperature .........................................–55 to +125°C
Operation temperature.......................................–40 to +85°C
1
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