MITSUMI
Protection of Lithium Ion Batteries MM1414
Protection of Lithium Ion Batteries
Monolithic IC MM1414
Outline
This IC is use to protect lithium-ion batteries consisting of three or four cells. It adopts a compact package
and has the functions of previous models, with functions for overcharge detection, overdischarge detection
and overcurrent detection. A dead time can be set externally.
Features
1. Overcharge detection voltage accuracy
±25mV/cell
2. Consumption current (Vcell=4.4V)
50µA typ.
3. Consumption current (Vcell=3.5V)
23µA typ.
4. Consumption current (Vcell=1.8V)
2µA typ.
5. Overcharge sensing dead time: can be set externally
6. PF detection: warning signal when cell voltage falls
Package
TSOP-20A
Applications
IC for protection of lithium-ion batteries consisting of three or four cells
MITSUMI
Pin Assignment
1
OV
11
SEL
2
N.C
12
N.C
3
CS
13
CON
4
N.C
14
N.C
5
DCHG
15
V1
6
N.C
16
V2
7
CDC
17
V3
8
COL
18
V4
9
COV
19
N.C
10
GND
20
V
CC
TSOP-20A
1
3
6
8
2
4 5
7
9 10
20
16
13
19
17
15 14
12
18
11
MITSUMI
Protection of Lithium Ion Batteries MM1414
Pin Description
Pin No. Pin name
I/O
Functions
Overcharge detection output pin
1
OV
Output
NPNTr open collector output
Normal: high impedance
Overcharge: Low
2
N.C
Not connected
Overcurrent detection pin
3
CS
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 discharge mode.
4
N.C
Not connected
Discharge control FET (P-ch) drive pin
5
DCHG
Output
Normal: Low
Overdischarge: High
6
N.C
Not connected
7
CDC
Input
Overdischarge detection dead time setting pin
Dead time can be set by connecting a capacitor between CDC pin and ground.
8
COL
Input
Overcurrent detection dead time setting pin
Dead time can be set by connecting a capacitor between COL pin and ground.
9
COV
Input
Overcharge detection dead time setting pin
Dead time can be set by connecting a capacitor between COV pin and ground.
10
GND
Input
Ground pin
11
SEL
Input
3 cell switch pin
SEL pin = GND: 3 cell (no V1 cell detection)
SEL pin = V
CC
: 4 cell
12
N.C
Not connected
Discharge FET ON/OFF pin
13
CON
Input
CON pin low; DCHG pin low
CON pin high; DCHG pin high
14
N.C
Not connected
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
Not connected
20
V
CC
Input
Power supply input pin
MITSUMI
Protection of Lithium Ion Batteries MM1414
Equivalent circuit diagram
Equivalent circuit diagram
17 ; V3
18 ; V4
Absolute Maximum Ratings
(Ta=5°C)
Item
Symbol
Ratings
Unit
Storage temperature
T
STG
-40~+125
°C
Operating temperature
T
OPR
-20~+70
°C
Power supply voltage
V
CC
max.
-0.3~24
V
OV pin impressed voltage
V
OV
max.
-0.3~24
V
SEL pin impressed voltage
V
SEL
max.
-0.3~24
V
CON pin impressed voltage
V
CON
max.
-0.3~24
V
Allowable loss
Pd
300
mW
Recommended Operating Conditions
Item
Symbol
Ratings
Unit
Operating temperature
T
OPR
-20~+70
°C
Operating voltage
V
OPR
+1.8~+24
V
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