MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1301
Protection of Lithium Ion Batteries (one cell)
Monolithic IC MM1301
Outline
This IC provides protection for the MM1291 series of compact, high-precision type lithium ion batteries which
have been in use for some time. Precision of 30mV is guaranteed between 0C and +50C, and this IC can
be used in applications where precision is crucial.
Features
1 Overcharge detection voltage
Ta=0~+50C
V
CEL
30mV
2 Overcharge detection delay time
C
TD
=0.082F
1.0S typ.
3 Current consumption (normal operation V
CEL
=3.5V)
10A typ.
4 Current consumption (overdischarge operation V
CEL
=1.9V)
0.7A typ.
5 Overcurrent cancel conditions Load removed : Load of 5M
or greater across battery pack terminals
Package
VSOP-8A
Applications
Lithium ion battery pack (for battery protection)
1-Cell Protection ICs
Package
Overcharge
Overdischarge Release
Overcurrent detection
detection Hysteresis Dead time
detection
voltage
Delay
SOP-8
VSOP-8 voltage
Overcurrent Detec time shot-mode
MM1301
AW
4.27V
200mV
2.3V
2.9V
100mV
0.9V
BW
4.17V
100mV
2.3V
2.9V
100mV
0.9V
CW
4.18V
100mV
2.3V
2.9V
125mV
0.45V
DW
4.28V
220mV
2.3V
2.9V
50mV
0.45V
EF
4.20V
100mV
2.3V
2.9V
125mV
0.45V
FW
4.28V
100mV
2.3V
2.9V
50mV
0.45V
GW
4.18V
220mV
2.3V
2.9V
125mV
0.45V
HW
4.35V
220mV
2.3V
2.9V
50mV
0.45V
JW
4.20V
220mV
2.3V
2.9V
125mV
0.45V
at
Ctd=
0.082F
min. 0.5S
typ. 1S
max. 1.5S
min. 5mS
typ. 10mS
max. 15mS
min. 5mS
typ. 10mS
max. 15mS
Note : Under open-load conditions, returns to normal mode from overcurrent mode.
(For MM1291A to G, J, M, 5M
or higher; for MM1291H, K, 50M
or higher)
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1301
Pin Assignment
Pin Description
1
4
3
2
8
5
6
7
VSOP-8A
1
GND
2
GD
3
CS
4
OC
5
N.C
6
TD
7
V
CC
8
V
IN
Pin No.
Pin name
Function
1
GND
Negative power supply pin
Also serves as voltage detection pin for battery connected between V
IN
and GND
Gate connection pin for discharge-control FET (N-ch)
2
GD
Turns the gate off in overdischarge mode and overcurrent mode. Gate is turned on in
overcharge and normal modes.
Overcurrent detection input pin
3
CS
Discharge current detected by connection to drain pin of discharge-control FET.
Discharge current = (CS-GND voltage)/(FET turn-on resistance)
Block Diagram
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1301
Recommended Operating Conditions
Electrical Characteristics
(Except where noted otherwise, Ta=25C)
Item
Symbol
Ratings
Units
Operating temperature
T
OPR
-20~+70
C
Operating voltage
V
OP
+0.9~+18
V
Item
Symbol
Measurement conditions
Min. Typ. Max. Units
Overcharge detection voltage
V
OC
V
CC
=V
IN
=L H, Ta=0~50C
4.15
4.18
4.21
V
Overcharge release voltage
V
OCR
V
CC
=V
IN
=H L
4.04
4.09
4.14
V
Overcharge sensing hysteresis
V
OCH
=V
OC
-V
OCR
V
OCH
60
90
120
mV
Overdischarge detection voltage
V
ODC
1
V
CC
=V
IN
=H L
2.20
2.30
2.40
V
Overdischarge release voltage
V
ODR
V
CC
=V
IN
=L H
2.78
2.90
3.02
V
Overcurrent detection threshold
V
CS
V
CS
=L H
112
125
138
mV
Overcurrent short-circuit detection
V
CSS
0.35
0.45
0.55
V
Overcurrent release conditions
Load open : Load of 5M
or greater across battery pack terminals
Consumption current 1 (Normal mode)
(I
S
1=I
CC
+I
IN
)
I
S
1
V
CC
=V
IN
=3.5V
10.0
14.0
A
Consumption current 2 (Overdischarge mode)
I
S
2
V
CC
=V
IN
=1.9V
0.7
1.0
A
Absolute Maximun Ratings
(Ta=25C)
Item
Symbol
Ratings
Units
Storage temperature
T
STG
-40~+125
C
Operating temperature
T
OPR
-20~+70
C
Power supply voltage
V
CC
max.
-0.3~+18
V
OC pin voltage
V
OC
max.
CS pin voltage
V
CS
max.
-0.6~V
CC
V
Allowable loss
Pd
300
mW
4
OC
Overcharge detection output pin
On overcharge, an external transistor is driven to turn off the charge-control FET (N-ch)
5
N.C
6
TD
Overcharge detection dead time setting pin
7
V
CC
Positive power supply voltage pin
8
V
IN
Voltage detection pin for battery connected between V
IN
and GND
Notes : Overcharge mode : Battery voltage > overcharge detection voltage
Normal mode : Overdischarge detection voltage < battery voltage < overcharge detection voltage,
discharge current < overcurrent detection level
Overdischarge mode : Overdischarge detection voltage > battery voltage
Overcurrent mode : Discharge current > overdischarge detection level=CS-GND voltage > discharge
current turn-on resistance (discharge-control FET)
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1301
Timing Chart
Overcharge cutoff voltage
Overcharge expulsion voltage
Overdischarge expulsion voltage
Overdischarge cutoff voltage
removing load
Cell voltage
TD
FET gate (charge control)
FET gate (discharge control)
Normal mode
Normal mode
Normal mode
Overcurrent
Overcharge mode
*
1: The overcurrent short mode delay time (overcurrent delay time 2) is the response time of the IC itself.
In actual use, the time required for discharge of the gate capacitance of the discharge-controlling FET is
added to this.
When excessive currents cause considerable voltage fluctuation, the bias current within the IC may be
temporarily turned off, so that the response time is lengthened. The time constant of the capacitance and
resistance connected to the power supply pin should be set to at least 100S/V, to limit power supply
fluctuations.
*
2: Use the following formula to calculate the overcharge detection time:
overcharge detection dead time t
OC
= 12.2 C
TD
[S]
[where C
TD
is the external capacitance in F]
Overcurrent detection delay time 1
t
CS
1
5.0
10.0
15.0
mS
Overcurrent detection delay time 2
t
CS
2
*
1
30
100
S
Overdischarge detection delay time
t
OD
5.0
10.0
15.0
mS
Overcharge detection delay time
t
OC
C
TD
=0.082F
*
2
0.5
1.0
1.5
S
OC pin output current
I
OC
V
CC
=V
IN
=4.5V
-30
A
GD pin "H" Output voltage
V
GDH
V
CC
=V
IN
=3.5V
V
CC
V
CC
V
(Normal mode)
-0.3
-0.1
GD pin "L" Output voltage
V
GDL
1
V
CC
=V
IN
=3.5V
(Overcurrent mode)
V
CS
=0.5V
0.1
0.3
V
GD pin "L" Output voltage
(Overdischarge mode)
V
GDL
2
V
CC
=V
IN
=1.5V
0.2
0.4
V
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1301
Characteristics
50
40
30
20
10
0
1.0
2.0
3.0
4.0
5.0
I
CC
I
IN
Power supply voltage (I
CC
, V
IN
) (V)
Power supply current (I
CC
, I
IN
) (
A)
10
1
0.1
0.01
0.001
0.01
0.1
External capacitance (CTD) (
F)
Overcharge detection time (S)
Power supply current vs power supply voltage
Overcharge detection time
Application circuits
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