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MITSUMI
Protection of Lithium Ion Batteries MM1414
Protection of Lithium Ion Batteries
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. Temperature conditions A: Ta=-25 ~ 75C, B: Ta=-20 ~ 70C, C: Ta=0 ~ 50C, D: Ta=0 ~ 40C, E: Ta=-20 ~ 25C
Overcharge detection voltage (V) Overcharge detection voltage temperature conditions Overcharge detection hysteresis voltage (V) Overdischarge Overdischarge Overcurrent detection resumption detection voltage (V) voltage (V) voltage (mV)
Series Table
Model
Package TSOP-20A AV CV DV FV GV
MM1414
4.3500.025 4.3500.025 4.2500.025 4.3250.025 4.2950.025
C C C C C
20060 20060 20060 20060 88
2.000.10 2.300.10 2.300.10 2.300.10 2.300.10
3.000.15 3.000.15 3.000.15 3.000.15 3.000.15
15015 15015 15015 10015 15015
Features
1. Consumption current (during overcharge) VCELL = 4.4 CON = 0V 2. Consumption current (normal) VCELL = 3.5V CON = 0V 3. Consumption current (during overdischarge) VCELL = 1.9V CON = 0V 4. Consumption current (during overdischarge) VCELL = 1.0V CON = VCC 5. Overcharge detection voltage (Ta = 0C ~ 50C) 55A typ. 15A typ. 0.5A typ. 0.1A max. A, C, D, G; Load open 500k or hight F; Load open 1MEG or hight
Package
TSOP-20A
Applications
IC for protection of lithium-ion batteries consisting of three or four cells Notebook PC lithium - ion battery packs
MITSUMI
Protection of Lithium Ion Batteries MM1414
Pin Assignment
1 2 3 20 19 18 17 16 15 14 13 12 11 4 5 1 2 3 4 5 6 7 8 9 10 TSOP-20A 6 7 8 9 10 OV N.C CS N.C DCHG N.C CDC COL COV GND 11 12 13 14 15 16 17 18 19 20 SEL N.C CON N.C V1 V2 V3 V4 N.C VCC
Block Diagram
MITSUMI
Protection of Lithium Ion Batteries MM1414
Pin Description
Pin No. Pin name I/O Overcharge detection output pin 1 OV Output NPNTr open collector output Normal: high impedance Overcharge: Low 2 N.C Not connected Overcurrent detection pin Monitors load current equivalently by the voltage drop between discharge control 3 CS Input 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 DCHG N.C CDC COL COV GND SEL N.C CON N.C V1 V2 V3 V4 N.C VCC Input Input Input Input Input Input Input Input Input Input Input Output Not connected Discharge control FET (P-ch) drive pin 5 Normal: Low Overdischarge: High 6 7 Not connected Overdischarge detection dead time setting pin Dead time can be set by connecting a capacitor between CDC pin and ground. Overcurrent detection dead time setting pin Dead time can be set by connecting a capacitor between COL pin and ground. Overcharge detection dead time setting pin Dead time can be set by connecting a capacitor between COV pin and ground. Ground pin 3 cell switch pin Not connected Discharge FET ON/OFF pin 13 CON pin low; DCHG pin low (Normal mode) CON pin high; DCHG pin high (Discharging prohibited) 14 15 16 17 18 19 20 Not connected V1 cell high side voltage input pin V2 cell high side voltage and V3 cell low side voltage input pin V3 cell high side voltage and V4 cell low side voltage input pin V4 cell high side voltage input pin Not connected Power supply input pin SEL pin = GND: 3 cell (Connect V1 to GND) SEL pin = VCC: 4 cell Functions
8
9 10 11 12
MITSUMI
Protection of Lithium Ion Batteries 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 MM1414
Pin
Equivalent circuit diagram
Pin
Equivalent circuit diagram
17 ; V3
18 ; V4
Absolute Maximum Ratings
Item Storage temperature Operating temperature Power supply voltage OV pin impressed voltage SEL pin impressed voltage CON pin impressed voltage Allowable loss Symbol TSTG TOPR VCC max. VOV max. VSEL max. VCON max. Pd Ratings -40~+125 -20~+70 -0.3~24 -0.3~24 -0.3~24 -0.3~24 300 Unit C C V V V V mW
Recommended Operating Conditions
Item Operating temperature Operating voltage Symbol TOPR VOPR Ratings -20~+70 +1.8~+24 Unit C V
MITSUMI
Protection of Lithium Ion Batteries MM1414
Electrical Characteristics
Item Consumption current (VCC pin) 1 Consumption current (VCC pin) 2 Consumption current (VCC pin) 3 Consumption current (VCC pin) 4 Consumption current (VCC pin) 5 Consumption current (V4 pin) 1 Consumption current (V4 pin) 2 Consumption current (V4 pin) 3 V3 pin input current V2 pin input current V1 pin input current Overcharge detection voltage Overcharge hysteresis voltage Overcharge sensing dead time Overdischarge detection voltage Discharge resume voltage Overdischarge hysteresis voltage Overdischarge sensing dead time Overcurrent detection voltage Overcurrent hysteresis voltage Overcurrent sensing dead time 1 Overcurrent sensing dead time 2 Overcurrent sensing dead time 3 Overcurrent reset conditions DCHG pin source current DCHG pin sink current DCHG pin output voltage H DCHG pin output voltage L OV pin sink current OV pin leak current CON pin L voltage CON pin H voltage CON pin current SEL pin L voltage SEL pin H voltage SEL pin current
(Except where noted otherwise, Ta=25C, VCC=V4+V3+V2+V1, VCEL=3.5V, CON=GND, SEL=VCC) Models listed MM1414G Measurement conditions VCELL=4.4V, CON=0V VCELL=3.5V, CON=0V VCELL=1.8V, CON=0V VCELL=3.5V, CON=VCC VCELL=1.8V, CON=VCC VCELL=4.4V VCELL=3.5V VCELL=1.8V VCELL=3.5V VCELL=3.5V VCELL=3.5V VCELL : 4.2V 4.4V, Ta=0~50C 4.4V 3.9V 0.5 2.20 2.85 0.45 0.5 135 5 5 20 20 0.8 0.8 100 0.1 0.4 VCC-0.4 1 VCC-0.4 1 2 2 0.4 VCELL : 4.2V -300 -300 -300 Min. Typ. Max. Unit 55 27 2 12 1 10 8 2.5 0 0 0 8 1.0 2.30 3.00 0.70 1.0 150 20 COL=0.001F COL=0.001F, VCC-CS>1.0V COL=0.001F VCELL=1.8V, SW1 : A VDCHG=VCC-0.8V VCELL=3.5V, SW1 : A VDCHG=0.8V VCC-VDCHG, ISO=20A, SW1 : B VDCHG-GND, ISI=-20A, SW1 : B VOV=0.4V, Ta=-20~+70C VOV=24V DCHG= "High" DCHG= "Low" VCELL=3.5V, CON=0.4V for 3 cell for 4 cell VCELL=3.5V, SEL=0.4V 10 1.5 10 110 50 4 20 2 20 15 5.0 +300 +300 +300 16 1.5 2.40 3.15 0.95 1.5 165 40 15 3.0 15 A A A A A A A A nA nA nA V mV s V V V s mV mV ms ms ms A A V V A A V V A V V A
Symbol ICC1 ICC2 ICC3 ICC4 ICC5 I1V4 I2V4 I3V4 IV3 IV2 IV1 VCELLU VU tOV VCELLS VCELLD VDS tCDC VOC VOC tCOL1 tCOL2 tCOL3 ISODCH ISIDCH VTHDCH VTHDCL ISIOV ILKOV
4.270 4.295 4.320
COV=0.1F VCELL : 3.5V VCELL : 1.8V 1.8V 3.5V
VCELLD-VCELLS CDC=0.1F VCC-VCS, DCHG
Load release conditions 500k
MITSUMI
Protection of Lithium Ion Batteries MM1414
Measuring Circuit
Timing Chart
For overcharge
Charge OFF Overcharge detection voltage
Cell voltage
Overcharge release voltage
COV pin
Sensing dead
OV pin (for pull up)
Normal state
Overcharge
Normal state
MITSUMI
Protection of Lithium Ion Batteries MM1414
For overdischarge
Discharge OFF Charge start Discharge resume voltage
Cell voltag detection voltage
Overdischarge
CON pin
Sensing dead
CDC pin
DCHG pin
Normal state
Normal state
Overdischarge
Normal state
External control
Normal state Normal state
For overcurrent
Overcurrent Load release Current flows from CS pin
CS pin
COL pin
Sensing dead Reset dead
DCHG pin
Normal state Overcurrent Normal state
MITSUMI
Protection of Lithium Ion Batteries MM1414
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 & Overdischarge Sensing Dead Times
10
Overcurrent Sensing Dead Time 1, Overcurrent Reset Dead Time 3
100
1
Dead time (ms)
0.01 0.1 1
Dead time (S)
10
0.1
0.01 0.001
1 100
1000
10000
Pin capacitance (F)
COL pin capacitance (pF)
Overcurrent Sensing Dead Time 2
100
Overcurrent Sensing Dead Time 2 (ms)
10
1
0 100
1000
10000
COL pin capacitance (pF)
Note: The above characteristics are representative values only, and are not guaranteed.

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