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MITSUMI
Protection of Lithium-Ion Batteries MM1412
Protection of Lithium-Ion Batteries
Monolithic IC MM1412
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. Temperature conditions A: Ta=-25 ~ 75C, B: Ta=-20 ~ 70C, C: Ta=0 ~ 50C, D: Ta=0 ~ 40C, E: Ta=-20 ~ 25C
Series Table
Model
Overcharge Overdischarge Overdischarge Overcurrent Overcharge Overcharge detection voltage detection detection reset detection detection hysteresis temperature SOP-8C, E VSOP-8A voltage (V) voltage (V) voltage (V) voltage (mV) voltage (V) conditions AW 4.3500.025 C 22050 2.30.1 3.50.2 15015 Package CW EF EW FW GW HW JW KW LW MW NW PW 4.2950.025 4.2500.025 4.2500.025 4.3000.025 4.2250.025 4.2500.025 4.3500.025 4.1250.025 4.1250.025 4.1900.025 4.3000.025 C C C C C C C C C C C 22050 15050 22050 30050 22050 22050 2.30.1 2.30.1 2.00.1 2.00.1 2.30.1 4.50.2 2.30.1 2.30.1 2.00.1 2.00.1 2.00.1 3.50.2 3.50.2 3.10.2 3.10.2 3.10.2 3.50.2 3.50.2 3.10.2 3.10.2 3.50.2 15015 15015 15015 14015 15015 15015 10015 15015 10015 10015 7515
MM1412
Features
1. Consumption current (during overcharge) VCELL = 4.5 ROC = 270 k 2. Consumption current (normal) VCELL = 3.5V 3. Consumption current (during overdischarge) VCELL = 1.9V 4. Consumption current (during overdischarge) VCELL = 1.0V 5. Overcharge detection voltage (Ta = 0C ~ 50C) 6. Hysteresis voltage 7. Overdischarge detection voltage 8. Overdischarge release voltage 9. Overcurrent detection threshold 10. Reset after overcurrent detection 11. Operating limit voltage 150A typ. 15A typ. 0.5A typ. 0.1A max. 435 25mV (detected for each cell) 220mV 50mV (detected for each cell) 2.30 0.1V (detected for each cell) 3.50V 0.2V (detected for each cell) 150mV 15mV Load open 0.9V max.
Package
VSOP-8A SOP-8C SOP-8E
MITSUMI
Protection of Lithium-Ion Batteries MM1412
Applications
1. Cell phone 2. Movie
Pin Assignment
1 2 8 7 6 5 3 4 1 2 3 4 5 6 VSOP-8A 7 8 OC GD CS GND TD VL VCC VH
Block Diagram
MITSUMI
Protection of Lithium-Ion Batteries MM1412
Pin Description
Pin No. Pin name Overcharge detection output pin 1 OC PNPTR open collector output Overcharge mode: ON Normal mode, overdischarge mode, overcurrent mode: OFF Discharge control FET (N-ch) control output pin 2 GD Normal mod, overcharge mode: H Overdischarge mode, overcurrent mode: L Overcurrent detection input pin 3 CS 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. 4 5 GND TD VL VCC VH 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. Battery intermediate potential input pin Connection pin for lower cell positive electrode side and upper cell negative electrode side. Power supply input pin Upper cell positive electrode input pin Functions
6 7 8
Note: Mode Descriptions (1) Overcharge mode Either H cell or L cell battery voltage exceeds overcharge detection voltage. Overcharge detection operation delay can be set by the dead time setting pin. (2) Normal mode Both H and L cell battery voltages exceed overdischarge detection voltage and are less than overcharge detection voltage. (3) Overdischarge mode Either H or L 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 of -6mV/C.) (4) Overcurrent mode Voltage between CS and GND exceeds overcurrent detection voltage during discharge.
MITSUMI
Protection of Lithium-Ion Batteries MM1412
Pin Description
Pin No. Pin name Equivalent circuit diagram Pin No. Pin name Equivalent circuit diagram
1
OC
5
TD
2
GD
6
VL
3
CS
8
VH
MITSUMI
Protection of Lithium-Ion Batteries MM1412
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage OC pin impressed voltage CS pin impressed voltage Allowable loss Symbol TSTG TOPR VCC max. VOC max. VCS max. Pd Ratings -40~+125 -20~+70 -0.3~+18 -0.6~VCC -0.6~VCC 300 Unit C C V V V mW
Recommended Operating Conditions
Item Operating temperature Operating power supply voltage Symbol TOPR VOP Ratings -20~+70 +0.9~+18 Unit C V
Electrical Characteristics
(Except where noted otherwise, Ta=25C) Models listed MM1412A
Item Symbol Measurement conditions Min. Typ. Max. Unit Overcharge detection voltage VOC Ta=0C~50C 4.325 4.350 4.375 V Overcharge detection hysteresis voltage VOC 170 220 270 mV Overdischarge detection voltage VOD 2.20 2.30 2.40 V Consumption current 1 IVH1 VH=VL=1.0V VCS=1.4V 0.1 A VH=VL=1.9V VCS=3.2V 0.5 0.8 A Consumption current 2 IVH2 VH=VL=3.5V 15.0 20.0 A Consumption current 3 IVH3 VH=VL=4.5V, ROC=270k 150 A Consumption current 4 IVH4 VH=VL=3.5V -0.3 0 0.3 A VL pin input current IVL Discharge resume by voltage rise 3.30 3.50 3.70 V Overdischarge release voltage VDF VH=VL=3.5V, IL=-10A VH-0.3 VH-0.2 V GD pin H output voltage VGDH VH=VL=3.5V, IL=10A 0.2 0.3 V GD pin L output voltage VGDL OC pin output current IOCH VH=VL=4.5V 30 150 A Overcurrent detection threshold value VCS1 135 150 165 mV Overcurrent short threshold value VCS2 When both battery pack pins are shorted 0.35 0.45 0.55 V Overcurrent release Load release: Load of 5MEG or more between both battery pack pins Overcurrent detection delay time 1 tOC1 7 12 18 ms Overcurrent detection delay time 2 tOC2 30 100 s *1 Overdischarge detection delay time tOD 8 13 20 ms Overcharge detection dead time tOCH CTC=0.18F 0.5 1.0 1.5 s VH=VL=2.5V -0.24 -0.12 -0.04 V Start-up voltage VST 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 100s/1V. Note 2: Calculate overcharge dead time according to the following formula: Overcharge detection dead time: tALM - 5.55 [CTD: external capacitor, Unit:F] CTD[s]
MITSUMI
Protection of Lithium-Ion Batteries MM1412
Measuring Circuit
Measuring Circuit 1 (VOC, VOC, VOD, VDF, VST, VCS, IDCH, VGDH, VGDL)
Measuring Circuit 2 (tOC, tOD, tOCH)
Note :
0.2V 1V/100S 2.5V 0V 1V/100S 4.5V
CS
VL
2.0V
VOD
VL
4.0V
VOC
GD
t OC
GD
OC
t OC t OCH
MITSUMI
Protection of Lithium-Ion Batteries MM1412
Timing Chart
Short load Overcharge Open load Over load Overcharge Keep overcharge Overdischarge detection Overdischarge Charge sensing
VH
Overdischarge Overcharge
VH
Overdischarge Dischage control Gate off dead time Keep cirquit setting
Power down dead time Overdischarge dead time
Power down Overdischarge dead time
GD Over current
dead time
TD
HI-impedance
OC
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 controls charge and discharge. The operation modes can be divided broadly into four, as follows. 1) Overcharge mode The battery voltage of either the H or L cell goes above overcharge detection voltage. Detection operation delay for overcharge detection can be set with the dead time setting pin. 2) Normal mode The battery voltage of both H and L cells is above overdischarge detection voltage and below overcharge detection voltage. 3) Overdischarge mode The battery voltage of either the H or L 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.) 4) Overcurrent mode The voltage between CS-GND goes above overcurrent detection voltage during discharge.
MITSUMI
Protection of Lithium-Ion Batteries 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)
1
0.1
0.01
0.001 0.001
0.01
0.1
External capacitance (CTD)
Note: Dead time can be calculated according to the following formula: tOC=5.55 CTD [S] tOC=Overcharge Detection Time CTD=External Capacitor***Unit : F The above specifications are representative, and are not guaranteed values.

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