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MM1292KF

Protection of Lithium Ion Batteries (two cells in series)

Mitsumi 

MITSUMI

Protection of Lithium Ion Batteries (two cells in series) MM1292

Electrical Characteristics (unless otherwise specified, Ta=25°C)

Item

Current consumption 1

Current consumption 2

Current consumption 3

Current consumption 4

VL pin input voltage

Overcurrent detection voltage

Hysteresis voltage

Overcharge detection voltage

Discharge resumption voltage

Starting voltage

GD pin output voltage H

GD pin output voltage L

OC pin output current

Overcurrent detection voltage

Reset by overcurrent

Overcurrent detection delay 1

Overcurrent detection delay 2

Excess discharge detection delay

TC pin charge current

Symbol

IVH1

IVH2

IVH3

IVH4

IVL

VALM

VAL

VS

VDF

VST

VGDH

VGDL

IOCH

VCS

TOC1

TOC2

TOD

ITC1

TC pin threshold value

VTC

Non-induction time for overcharge TOC

Operating limit voltage

VOPL

Measurement Conditions

Min. Typ. Max. Units

VCELL=4.5V, ROC=270kΩ

80 100 µA

VCELL=3.5V (normal)

13.0 20.0 µA

VCELL=1.9V (During excess discharge)

0.5 0.8 µA

VCELL=1.0V (During excess discharge)

0.1 µA

VH=VL

-0.3 0 0.3 µA

Ta=-20°C~70°C

4.20 4.25 4.30 V

VAL=VALMH-VALML

140 200 260 mV

2.30 2.40 2.50 V

Discharge resumed through voltage rise 2.90 3.00 3.10 V

Voltage applied between GND-CS pins -0.6 -0.5

V

VCELL=3.5V, IL=10µA

VH-0.3 VH-0.2

V

VCELL=3.5V, IL=10µA, VCS=1V

0.2 0.3 V

VCELL=4.5V

20 150

µA

135 150 165 mV

load release

10 20

mS

between CS-GND pins > 0.8V

30 100 µS

10 20

mS

30 50 80 nA

VCELL=4.5V, VTC=0 5V

VOC=L H

3.65 3.90 4.15 V

CTC=0.012µF

0.5 1.0 1.5 S

0.9 V

Note 1. For current consumption, it is assumed that high side cell voltage and low side cell voltage are

identical. When the cell voltages differ, it is set by the higher voltage.

2. GD pin are high impedance when the current consumption is below the operating limit voltage.

3. When the circuit configuration calls for discharge resumption through charging, the discharge

resumption voltage is 2.4V typ.

Description of Operation

[Outline]

This IC is used for protecting lithium ion batteries (two cell series connection type). Overcharge detection,

excess discharge detection, and overcurrent detection are built into each circuit. It controls the FET for

discharge control and charge control (external N-MOS FET). There are four major operating modes.

1. Overcharge mode

When the voltage between Vh-VI and VI-GND exceeds the overcharge voltage (VALM).

2. Normal mode

When the voltage between Vh-VI and VI-GND exceeds the excess discharge voltage (VS) and is less

than the over charge voltage (VALM).

3. Excess discharge mode

When the voltage between Vh-VI and VI-GND is less than the excess discharge voltage (VS).

4. Overcurrent mode

When the voltage between CS-GND is less than the overcurrent voltage (VCS).

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