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Protection for Lithium-Ion Batteries (2-serial cells) MM1412
Protection for Lithium-Ion Batteries (2-serial cells)
Monolithic IC MM1412

October 22, 1998
This IC protects lithium-ion batteries in the event of overcharge, overdischarge and overcurrent. It has the following two functions: an overcharge 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 enters low current consumption 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. Since the functions above are provided, the protection circuitry for lithium-ion batteries can be comprised with fever external components.
Temperature conditions A: Ta=-25 ~ 75°C, B: Ta=-20 ~ 70°C, C: Ta=0 ~ 50°C,
Series Table
D: Ta=0 ~ 40°C, E: Ta=-20 ~ 25°C
Overcharge
Overcharge
Overcharge
Overdischarge Overdischarge
Overcurrent
detection voltage
detection
detection
detection
detection
temperature
hysteresis
SOP-8C, E VSOP-8A
voltage (V)
voltage (V)
voltage (V)
voltage (mV)
conditions
voltage (V)
Features
1. Consumption current (during overcharge) VCELL = 4.5 ROC = 270 kΩ 150µA typ.
3. Consumption current (during overdischarge) 4. Consumption current (during overdischarge) 5. Overcharge detection voltage (Ta = 0°C ~ 50°C) Protection for Lithium-Ion Batteries (2-serial cells) MM1412
Applications
Pin Assignment
Block Diagram
Protection for Lithium-Ion Batteries (2-serial cells) MM1412
Pin Description
Pin No. Pin name
Functions
Normal mode, overdischarge mode, overcurrent mode: OFF Discharge control FET (N-ch) control output pin Monitors discharge current equivalently by the voltage drop between discharge control FET source and drain. Stops discharge when voltage between CS pin and GND pin goes above overcurrent detection threshold value, and holds until load is released.
Ground pin, or lower cell load negative pole input pin.
Overcharge detection dead time setting pin Dead time can be set by adding a capacitor between TD and GND pins.
Connection pin for lower cell positive electrode side and upper cell negative electrode side.
Either upper cell or lower cell battery voltage exceeds overcharge detection voltage. Overcharge detection operation delay can be set by the dead time setting pin.
Both upper cell and lower cell battery voltages exceed overdischarge detection voltage and are less Either upper cell or lower cell battery voltage is less than overdischarge detection voltage.
Overdischarge detection dead time is set internally. Overdischarge mode is released when charging causes voltage to rise above overdischarge detection voltage. Also, when battery voltage goes above overdischarge release voltage, it resets without charging, but the value is set high. (This function is included in case charging can not be detected. Also, this release voltage has a temperature coefficient Voltage between CS and GND exceeds overcurrent detection voltage during discharge.
Protection for Lithium-Ion Batteries (2-serial cells) MM1412
Pin Description
Pin No. Pin name
Equivalent circuit diagram
Pin No. Pin name
Equivalent circuit diagram
Protection for Lithium-Ion Batteries (2-serial cells) MM1412
Absolute Maximum Ratings
Storage temperature
Operating temperature
Power supply voltage
OC pin impressed voltage
CS pin impressed voltage
Allowable loss
Recommended Operating Conditions
Operating temperature
Operating power supply voltage
Electrical Characteristics (Except where noted otherwise, Ta=25°C) Models listed MM1412A
Measurement conditions
Min. Typ. Max. Unit
Overcharge detection voltage
Overcharge detection hysteresis voltage
Overdischarge detection voltage
Consumption current 1
Consumption current 2
Consumption current 3
Consumption current 4
VL pin input current
Overdischarge release voltage
GD pin H output voltage
GD pin L output voltage
OC pin output current
Overcurrent detection threshold value
Overcurrent short threshold value
Overcurrent release
Load release: Load of 5MEGΩ or more between both battery pack pins Overcurrent detection delay time 1
Overcurrent detection delay time 2
Overdischarge detection delay time
Overcharge detection dead time
Start-up voltage
Note 1: Overcurrent short mode delay time (overcurrent delay time 2) is IC response speed.
In actual use, the time for discharging the discharge control FET gate capacity is added.
Also, when voltage change is large due to excess current, the IC internal bias current may turn off temporarily, causing response time to lengthen. Select the time constant for the capacitor connected to the power supply pin so that power supply fluctuation is more than 100µs/1V.
Note 2: Calculate overcharge dead time according to the following formula: Overcharge detection dead time: tALM - 5.55 CTD[s] Protection for Lithium-Ion Batteries (2-serial cells) MM1412
Measuring Circuit
Measuring Circuit 1
(VOC, VOC, VOD, VDF, VST, VCS, IDCH, VGDH, VGDL)

Measuring Circuit 2
(tOC, tOD, tOCH)

Protection for Lithium-Ion Batteries (2-serial cells) MM1412
Timing Chart
Dischage
control

dead time Keep cirquit
GD Over current
Description
This IC is a lithium ion battery (2-cell in-series type) protection IC. It has built-in overcharge detection, overdischarge detection and overcurrent detection circuits, and controls the FET (external N-MOS FET) that The operation modes can be divided broadly into four, as follows.
The battery voltage of either the upper cell or lower cell goes above overcharge detection voltage.
Detection operation delay for overcharge detection can be set with the dead time setting pin.
The battery voltage of both upper cells and lower cells is above overdischarge detection voltage and below The battery voltage of either the upper cell or lower cell drops below overdischarge detection voltage. Dead time for overdischarge detection is set internally. Overdischarge mode is released when charging takes place and the voltage goes above overdischarge detection voltage. Also, reset will occur even without charging if battery voltage goes above overdischarge release voltage, but the set value is high. (This function is provided as a measure for cases when charging can not be detected. Further, this release voltage has a temperature coefficient of -6mV/°C.) The voltage between CS-GND goes above overcurrent detection voltage during discharge.
Protection for Lithium-Ion Batteries (2-serial cells) MM1412
Application Circuit
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.
Characteristics
Overcharge Detection Time (Dead Time)
Overcharge detection time (S) 0.001
External capacitance (CTD)
Note: Dead time can be calculated according to the following formula: The above specifications are representative, and are not guaranteed values.

Source: http://andrew1955.ucoz.ru/Info/Protect/2/battery_mm_1412_e.pdf

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