Datasheet MM1451 Datasheet (MITSMI)

MITSUMI

1432

8567

VSOP-8B

MITSUMI

Protection of Lithium-Ion Batteries (for Double-Protect) MM1451

Protection of Lithium-Ion Batteries (for Double-Protect)

Monolithic IC MM1451

Outline

This IC is used for double-protection of lithium-ion batteries with from one to three cells, and has an ultra­compact package. Short-circuits between cells accommodate series connections of one to three cells.

Features

1. Overcharge detection voltage accuracy (0°C to 50°C) ±50 mV/cell.

2. Consumption current (Vcell=3.8V) 3µA typ.

3. Consumption current (Vcell=2.3V) 0.3µA typ.

4. Pin I/O current between cells (Vcell=3.8V) 0.3µA max.

5. Delay time on overcharge voltage detection (Ct=0.22µF) 1.5S typ.

6. Output current (Vcell=V

CC=4.5 V) 500µA typ.

Package

VSOP-8B

Applications

IC for double-protection of lithium-ion batteries with one to three cells.

Pin Assignment

1 V3

2 V2

3 V1

4 GND

5 Ct

6 N.C

7 OUT

8 V

CC

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Block Diagram

Protection of Lithium-Ion Batteries (for Double-Protect) MM1451

MITSUMI

Protection of Lithium-Ion Batteries (for Double-Protect) MM1451

Pin Description

Pin No. Pin name Functions Equivalent circuit diagram

1 V3 3-cell power supply

2 V2 2-cell power supply

3 V1 1-cell power supply

5 Ct Delay capacity pin

7 OUT OUT pin

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Protection of Lithium-Ion Batteries (for Double-Protect) MM1451

Absolute Maximun Ratings

Item Symbol Ratings Unit

Operating temparature T

Storage temparature T

V

CC Input voltage VCC

V1 Input voltage *1 V1

V2 Input voltage

V3 Input voltage

Ct pin voltage

V

OUT pin voltage VOUT

1 V2

*

1 V3

*

2 VCT

*

Allowable loss Pd 170 mW

>

>

Note 1 : *1 18V
Note 2 :

2 Do not impress current of 300µA or more on the Ct pin.

*

V3

=

>

V2

=

=

Electrical Characteristics 1

Item Symbol Measurement conditions Min. Typ. Max. Unit

(Ta=25°C)

OPR

STG

>

-

V1

0.3

=

(Except where noted otherwise, Ta=25°C, V

-

20~+80 °C

-

40~+125 °C

-

0.3~18 V

-

0.3~18 V

-

0.3~18 V

CEL

=V3-V2=V2-V1=V1-GND, VCC=3 V

CEL

)

Current consumption 1 I

Current consumption 2 I

Pin I/O current between cells I

Overcharge detection voltage

VS VCEL=L H Ta=-20~+70°C 4.400 4.450 4.500 V

Hysterisis voltage Hys V

Overcharge detection delay time

Output current I

TPLH Ct=0.22µF 1.0 1.5 2.0 S

OH VCEL=VCC=4.5V VO=3V 100 500 µA

Electrical Characteristics 2

Item Symbol Measurement conditions Min. Typ. Max. Unit

Current consumption 1 I

Current consumption 2 I

Pin I/O current between cells I

Overcharge detection voltage

Hysterisis voltage Hys V

Overcharge detection delay time

VS VCEL=L H Ta=-20~+70°C 4.400 4.450 4.500 V

TPLH Ct=0.22µF 1.0 1.5 2.0 S

1 VCEL=3.8V 3.0 6.0 µA

2 VCEL=2.3V 0.3 0.5 µA

3 VCEL=3.8V (between V3, V2, V1) ±0.0 ±0.3 µA

CEL=L H L 35 50 65 mV

(Except where noted otherwise, Ta=25°C, V

1 VCEL=3.8V, VCC=VCEL 3 3.0 6.0 µA

2 VCEL=2.3V, VCC=VCEL 3 0.3 0.5 µA

3 VCEL=3.8V (between V3, V2, V1) ±0.0 ±0.3 µA

CEL=L H L 35 50 65 mV

CEL

=V3-V2=V2-V1=V1-GND, VCC=3 V

CEL

)

Output current I

Output leakage current I

OH VCEL=VCC=4.6V VO=3V 100 500 µA

LEAK VCEL=3.8V, VCC=18V 0.1 µA

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Protection of Lithium-Ion Batteries (for Double-Protect) MM1451

Electrical Characteristics 3

Item Symbol Measurement conditions Min. Typ. Max. Unit

Current consumption 1 I

Current consumption 2 I

Current consumption 3 I

Current consumption 4 I

Pin I/O current between cells I

Overcharge detection voltage

VS VCEL=L H Ta=-20~+70°C 4.400 4.450 4.500 V

Hysterisis voltage Hys V

Overcharge detection delay time

Output current I

Output leakage current I

TPLH Ct=0.22µF 1.0 1.5 2.0 S

OH VCEL=VCC=4.6V VO=3V 100 500 µA

LEAK VCEL=3.8V, VCC=18V 0.1 µA

Measuring Circuit

(Except where noted otherwise, Ta=25°C, V

1 VCEL=3.8V, VCC=VCEL 3 2.5 3.5 µA

2 VCEL=3.8V, VCC=VCEL 3 1.5 2.5 µA

3 VCEL=2.3V, VCC=VCEL 3 0.15 0.3 µA

4 VCEL=2.3V, VCC=VCEL 3 0.1 0.2 µA

3 VCEL=3.8V (between V3, V2, V1) ±0.0 ±0.3 µA

CEL=L H L 35 50 65 mV

CEL

=V3-V2=V2-V1=V1-GND, VCC=3 V

CEL

)

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4.45V

4.40V

1.5S

1.8V

0.6V

OUT
(at Ct short)
(at Ct open)

OUT

Ct

V1~V3

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Application Circuit

Delay time Td(S) = 7 CCt (µF)

Protection of Lithium-Ion Batteries (for Double-Protect) MM1451

Note 1: Can support 1, 2 or 3 cells by shorting each cell. However, be sure to connect a battery for V3 cell.

V3 cell may not operate correctly when shorted.

Note 2: When connecting batteries, be sure to connect in the following order: GND V3, and V

V2.

Note 3: Output may go ON momentarily when starting up power supply. If this error output during startup

becomes a problem, connect the V

Note 4: Operation can not be guaranteed for connections other than the above.

CC pin last.

Timing Chart

CC V1OR

Note: Output goes low simultaneously with overcharge detection at Ct pin short and open.

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Input voltage (No delay) (V)

6

5

4

3

2

1

0

01234.400 4.450

Output voltage (V)

Temperature (°C)

2.5

3.0

2.0

1.5

1.0

0.5

0.0

-

25 25 75

2200p pm2200ppm

-

500p pm

-

500ppm

Delay time (S)

5

6

4
3
2

1

0

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

Cell voltage (V)

Consumption

current (µA)

Cell voltage (V)

0.2

0.3

0.1
0

-

0.1

-

0.2

-

0.3

0 0.5 1 1.5 2 2.5 3 3.5 4 4.5

Pin I/O current

between cells (µA)

Protection of Lithium-Ion Batteries (for Double-Protect) MM1451

Characteristics

Detection voltage Output delay time

Consumption current

Pin I/O current between cells