MM1414CV - Mitsumi Electric Company, Ltd.

MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414

Protection for Lithium-Ion Batteries (3-/4-serial cells)

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 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.

Features

1. Consumption current (during overcharge) VCELL = 4.4 CON = 0V 55µA typ.

2. Consumption current (normal) VCELL = 3.5V CON = 0V 15µA typ.

3. Consumption current (during overdischarge) VCELL = 1.9V CON = 0V 0.5µA typ.

4. Consumption current (during overdischarge) VCELL = 1.0V CON = VCC 0.1µA max.

5. Overcurrent release conditions A, C, D, G; Load open 500kΩor more

F; Load open 1MEGΩor more

Package

TSOP-20A

Applications

Lithium-ion battery packs for note PCs

MITSUMI

Model

Package

TSOP-20A

AV 4.350±0.025 C 200±60 2.00±0.10 3.00±0.15 150±15

CV 4.350±0.025 C 200±60 2.30±0.10 3.00±0.15 150±15

MM1414 DV 4.250±0.025 C 200±60 2.30±0.10 3.00±0.15 150±15

FV 4.325±0.025 C 200±60 2.30±0.10 3.00±0.15 100±15

GV 4.295±0.025 C 8±8 2.30±0.10 3.00±0.15 150±15

Overcharge

detection

voltage (V)

Overcharge

detection voltage

temperature

conditions

Overcharge

detection

hysteresis

voltage (V)

Overdischarge

detection

voltage (V)

Overdischarge

resumption

voltage (V)

Overcurrent

detection

voltage (mV)

Series Table Temperature conditions A: Ta=

25 ~ 75°C, B: Ta=-20 ~ 70°C, C: Ta=0 ~ 50°C,

D: Ta=0 ~ 40°C, E: Ta=

20 ~ 25°C

April 14, 1999

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MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414

MITSUMI

Block Diagram

Pin Assignment

1OV 11 SEL

2N.C 12 N.C

3CS 13 CON

4N.C 14 N.C

5DCHG 15 V1

6N.C 16 V2

7CDC 17 V3

8COL 18 V4

9COV 19 N.C

10 GND 20 VCC

TSOP-20A

13 6824579

20 16 1319 17 15 14 1218 11

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MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414

Pin Description

Pin No.

Pin name

I/O Functions

Overcharge detection output pin

1OV Output NPNTr open collector output

Normal: high impedance

Overcharge: Low

2N.C

Overcurrent detection pin

3CS Input

Monitors load current equivalently by the voltage drop between discharge control

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.

4N.C

Discharge control FET (P-ch) drive pin

5DCHG Output Normal: Low

Overdischarge: High

6N.C

7CDC Input Overdischarge detection dead time setting pin

Dead time can be set by connecting a capacitor between CDC pin and ground.

8COL Input Overcurrent detection dead time setting pin

Dead time can be set by connecting a capacitor between COL pin and ground.

9COV Input Overcharge detection dead time setting pin

Dead time can be set by connecting a capacitor between COV pin and ground.

10 GND Input GND pin

11 SEL Input 3 cell switch pin SEL pin = GND: 3 cell (Connect V1 to GND)

SEL pin = VCC: 4 cell

12 N.C

Discharge FET ON/OFF pin

13 CON Input CON pin low; DCHG pin low (Normal mode)

CON pin high; DCHG pin high (Discharging prohibited)

14 N.C

15 V1 Input V1 cell high side voltage input pin

16 V2 Input V2 cell high side voltage and V3 cell low side voltage input pin

17 V3 Input V3 cell high side voltage and V4 cell low side voltage input pin

18 V4 Input V4 cell high side voltage input pin

19 N.C

20 VCC Input Power supply input pin

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MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) 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

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MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414

Pin Equivalent circuit diagram Pin Equivalent circuit diagram

17 ; V3 18 ; V4

Absolute Maximum Ratings

Item Symbol Ratings Unit

Storage temperature TSTG

40~+125 °C

Operating temperature TOPR

20~+70 °C

Power supply voltage VCC max.

0.3~24 V

OV pin impressed voltage VOV max.

0.3~24 V

SEL pin impressed voltage VSEL max.

0.3~24 V

CON pin impressed voltage VCON max.

0.3~24 V

Allowable loss Pd 300 mW

Recommended Operating Conditions

Item Symbol Ratings Unit

Operating temperature TOPR

20~+70 °C

Operating voltage VOPR +1.8~+24 V

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MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414

MITSUMI

Electrical Characteristics (Except where noted otherwise, Ta=25°C, VCC=V4+V3+V2+V1,

VCEL=3.5V, CON=GND, SEL=VCC) Models listed MM1414G

Item Symbol Measurement conditions Min. Typ. Max. Unit

Consumption current (V

pin) 1

ICC1VCELL=4.4V, CON=0V 55 110 µA

Consumption current (V

pin) 2

ICC2VCELL=3.5V, CON=0V 27 50 µA

Consumption current (V

pin) 3

ICC3VCELL=1.8V, CON=0V 2 4 µA

Consumption current (V

pin) 4

ICC4VCELL=3.5V, CON=VCC 12 20 µA

Consumption current (V

pin) 5

ICC5VCELL=1.8V, CON=VCC 12µA

Consumption current (V4 pin) 1

I1V4 VCELL=4.4V 10 20 µA

Consumption current (V4 pin) 2

I2V4 VCELL=3.5V 8 15 µA

Consumption current (V4 pin) 3

I3V4 VCELL=1.8V 2.5 5.0 µA

V3 pin input current IV3 VCELL=3.5V

300 0 +300 nA

V2 pin input current IV2 VCELL=3.5V

300 0 +300 nA

V1 pin input current IV1 VCELL=3.5V

300 0 +300 nA

Overcharge detection voltage

VCELLUVCELL : 4.2V 4.4V, Ta=0~50°C 4.270 4.295 4.320 V

Overcharge hysteresis voltage

VU VCELL : 4.2V 4.4V 3.9V 8 16 mV

Overcharge sensing dead time

tOV COV=0.1µF 0.5 1.0 1.5 s

Overdischarge detection voltage

VCELLSVCELL : 3.5V 1.8V 2.20 2.30 2.40 V

Discharge resume voltage VCELLDVCELL : 1.8V 3.5V 2.85 3.00 3.15 V

Overdischarge hysteresis voltage

VDS VCELLD

VCELLS 0.45 0.70 0.95 V

Overdischarge sensing dead time

tCDC CDC=0.1µF 0.5 1.0 1.5 s

Overcurrent detection voltage

VOC VCC

VCS, DCHG 135 150 165 mV

Overcurrent hysteresis voltage

VOC 20 40 mV

Overcurrent sensing dead time 1

tCOL1 COL=0.001µF 5 10 15 ms

Overcurrent sensing dead time 2

tCOL2 COL=0.001µF, VCC

CS>1.0V 1.5 3.0 ms

Overcurrent sensing dead time 3

tCOL3 COL=0.001µF 5 10 15 ms

Overcurrent reset conditions

Load release conditions 500kΩ

DCHG pin source current ISODCH VCELL=1.8V, SW1 : A VDCHG=VCC

0.8V 20 µA

DCHG pin sink current ISIDCH VCELL=3.5V, SW1 : A VDCHG=0.8V 20 µA

DCHG pin output voltage H VTHDCHVCC

VDCHG, ISO=20µA, SW1 : B 0.8 V

DCHG pin output voltage L VTHDCL VDCHG

GND, ISI=

20µA, SW1 : B 0.8 V

OV pin sink current ISIOV VOV=0.4V, Ta=

20~+70°C 100 µA

OV pin leak current ILKOV VOV=24V 0.1 µA

CON pin L voltage DCHG= "High" 0.4 V

CON pin H voltage DCHG= "Low"

0.4

CON pin current VCELL=3.5V, CON=0.4V 1 2 µA

SEL pin L voltage for 3 cell 0.4 V

SEL pin H voltage for 4 cell

0.4

SEL pin current VCELL=3.5V, SEL=0.4V 1 2 µA

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MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414

MITSUMI

Measuring Circuit

Timing Chart

Overcharge detection voltage

Overcharge release voltage

Charge OFF

Sensing dead

Normal state Overcharge Normal state

Cell voltage

COV pin

OV pin (for pull up)

For overcharge

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MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414

Cell voltag

CON pin

CDC pin

DCHG pin

Overdischarge

detection voltage

Discharge OFF Charge start

Discharge resume voltage

Sensing

dead

Normal state Normal state Overdischarge Normal state

External control Normal state Normal state

Sensing dead Reset dead

Overcurrent Load release

Current flows

from CS pin

Normal state Overcurrent Normal state

CS pin

COL pin

DCHG pin

For overdischarge

For overcurrent

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MITSUMI Protection for Lithium-Ion Batteries (3-/4-serial cells) MM1414

Application Circuit

Characteristics

0.001

0.01

0.1

0.01 0.1 1

Pin capacitance (µF)

Dead time (S)

COL pin capacitance (pF)

100

100 1000 10000

Dead time (ms)

100 1000 10000

100

COL pin capacitance (pF)

Overcurrent Sensing

Dead Time 2 (ms)

Overcharge & Overdischarge Sensing Dead Times

Overcurrent Sensing Dead Time 1,

Overcurrent Reset Dead Time 3

Overcurrent Sensing Dead Time 2

Note: The above characteristics are representative values only, and are not guaranteed.

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.

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