MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Protection of Lithium Ion Batteries (one cell)
Monolithic IC MM1291
Outline
This is a protection IC for one-cell series that protects lithium ion batteries during excess charging,
discharging, or overcurrent. If abnormalities occur during charging and excess voltage is applied, it has a
function that turns off the external FET switch when voltage is applied to each battery beyond a specified time
(overcharging detection). It also has a function that turns off the external FET switch when the voltage for
each battery falls below a set voltage, to prevent excess discharge when discharging the battery (discharging
detection). At that time, the IC is switched to low current consumption mode. Also, when there is a large
current flow due to shorting or other reasons, there is a functions for turning off the external FET switch
(overcurrent detection). These function comprise a protection circuit, with few external parts, for lithium ion
batteries.
1-Cell Protection ICs
Overcharge
detection
SOP-8
VSOP-8 voltage
MM1291AF
AW
4.35V
BF
BW
4.25V
CF
4.10V
DF
4.35V
EF
4.35V
GF
4.225V
HF
HW
4.35V
JW
4.25V
KF
4.25V
MW
4.30V
Package
Hysteresis Dead time
200mV
200mV
25mV
25mV
27mV
27mV
200mV
270mV
200mV
270mV
Overdischarge Release
detection voltage
Delay
Overcurrent detection
Detec time shot-mode
No
No
No
min. 5mS
No
No
typ. 10mS
No
0.45V
max. 15mS
0.45V
0.9V
0.45V
at
Ctd=
0.082µF
min. 0.5S
typ. 1S
max. 1.5S
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
*
2.6V 2.4V
2.3V
2.3V
2.3V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
2.9V
Overcurrent
100mV
100mV
150mV
min. 5mS
100mV
100mV
typ. 10mS
100mV
50mV
max. 15mS
125mV
50mV
125mV
Note : Under open-load conditions, returns to normal mode from overcurrent mode.
(For MM1291A to G, J, M, 5MΩ or higher; for MM1291H, K, 50MΩ or higher)
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Features
1.
2.
3.
4.
5.
Current consumption (during overcharging)
Current consumption (normal)
Current consumption (during excess discharge)
Consumption current (during excess discharge)
Overcharge detection voltage (Ta=-20°C~+70°C)
V
CC
=4.5V
V
CC
=3.5V
V
CC
=1.9V
V
CC
=1.0V
V
CC
pin 40µA typ.
V
CC
pin 7µA typ.
0.7µA typ.
0.17µA max.
A 4.35V±50mV
B 4.25V±50mV
C 4.10V±50mV
A 200mV typ.
B 200mV typ.
C 27mV typ.
1S typ.
2.6V±0.1V
2.4V±0.1V
2.9V±0.12V
10mS typ.
A 100mV±10mV
B 100mV±10mV
C 150mV±15mV
load release
10mS typ.
V
IN
pin 3µA typ.
V
IN
pin 2µA typ.
6. Overcharge detection hysteresis
7. Overcharge non-induction time
8. Excess discharge voltage 1
9. Excess discharge voltage 2
10.Excess discharge reset voltage
11.Excess discharge during non-induction
12.Overcurrent detection voltage
C
TD
=0.082µF
V
CS
=0V
V
CS
=0.05V
13.Reset after overcurrent detection
14.Overcurrent detection non-induction time
Package
SOP-8C, SOP-8D (MM1291 F)
VSOP-8A (MM1291 W)
The box represents the rank resulting from the combination of protection functions.
*
Applications
1.
2.
3.
4.
Cellular phones
PHS
MD
others
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Pin Assignment
1
2
8
7
6
5
3
4
5
1
2
3
4
6
7
SOP-8C/SOP-8D
8
GND
GD
CS
OC
CE
TD
V
CC
V
IN
Pin Description
Pin N
O
.
N
AME
GND
I/O
Input
connected between V
IN
-GND.
Nch-FET gate connection pin for discharge control. Switches gate OFF when
2
GD
Output
excess discharge is detected, and for current protection. Switches gate ON when
excess discharge is detected in normal state.
Detection pin for voltage between CS-GND. Detects excess discharge using Nch-
3
CS
Input
FET (discharge control) ON resistor and discharge current.
Control pin for Nch-FET for charge control. Switches FET off by activating an
4
OC
Output
external transistor when excess charging is detected.
N.C
This pin sets non-induction time for overcharge detection. It charges the capacitor
6
TD
V
CC
V
IN
Input
connected between TD-GND with a fixed current during overcharging.
7
8
Input
Input
Positive power supply pin for the IC.
Detection pin for the battery connected between V
IN
-GND.
Description
Negative power supply for this IC. Also acts as detection pin for the battery
1
5
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
Block Diagram
V
S
indicates average values.
V
ALML
is low due to the effect of R1 linked to the V
IN
pin.
*
1
A : 4.150V
B : 4.050V
C : 4.073V
*
2
A : 4.350V
B : 4.250V
C : 4.100V
*
3
A : 0.10V
B : 0.10V
C : 0.15V
Timing Chart
Charge
Excess
Normal
discharge
Charge
Charge
Overcurrent protection
Normal Excess
Overcurrent protection
Excess
Excess
Normal discharge
Normal
Normal Excess discharge
discharge Normal
Charge
V
IN
(V
CC
)
CS
V
ALM
V
ALML
V
DF
V
S1
0V
unsettled
1
1.0V
0V V
CS
V
ST
Load release
Load release
Load release
unsettled
*
TOO
GD
0V
TOC1
TOD
TOC2
TOC2
TD
0V
T
ALM
OC
0V
*
1 C only
MITSUMI
Protection of Lithium Ion Batteries (one cell) MM1291
MM1291AFBE
Absolute Maximum Ratings
(Ta=25°C)
Item
Storage temperature
Operating temperature
Power supply voltage
V
CC
-OC pin voltage
CS pin voltage
Allowable loss
Symbol
T
STG
T
OPR
V
CC
V
OC
V
CS
P
D
Rating
-40~+125
-20~+70
-0.3~+18
-18~0
-0.6~V
CC
300
Units
°C
°C
V
V
V
mV
CS
*
The CS pin will not cause abnormal operation when connected to protection resistor R
Electrical Characteristics
(=4.7kΩ)
(Unless otherwise specified Ta=25°C, V
CC
=V
IN
=3.5V, V
CS
=0V, Measurement circuit 1, SW1 : a)
Symbol
I
CC
1
I
OP
2
V
ALM
Measurement Conditions
V
CC
=V
IN
=3.5V
V
CC
=V
IN
=1.9V
Ta=-20°C~70°C
V
CC
=V
IN
=4.0V 4.5V
V
OC
: L H
V
CC
=V
IN
=4.5V 4.0V
V
OC
: H L
V
OC
-V
OCR
V
CC
=V
IN
=3.1V 2.0V
V
GD
: H L, V
CS
=0V
V
CC
=V
IN
=3.1V 2.0V
V
CS
=0.05V, V
GD
: H L
V
CC
=V
IN
=2.0V 3.1V
V
GD
: L H
V
CC
=V
IN
=2.75V
V
CS
=0V -0.5V, V
GD
: L H
V
CS
=0V 0.12V
V
GD
: H L
V
CC
=V
IN
=3.0V 2.4V, 1
measurement circuit 2, SW1 : b, SW2 : a
V
CS
=0V V
CS
, 1
measurement circuit 2, SW1 : a, SW2 : b
V
CC
=V
IN
=4.0V 4.5V, 1
measurement circuit 2, SW1 : b, SW2 : a
C
TD
=0.082µF
V
CC
When V
GDL
2 > 0.4V
Min. Typ. Max. Units
8.0 11.0 µA
0.7
1.0
µA
4.300 4.350 4.400
V
Item
1 (Normal mode) (I
S
1=I
CC
+I
IN
)
Consumption current 2 (Overdischarge mode)
Overcharge detection voltage
Overcharge reset voltage
Overcharge hysteresis voltage
Excess discharge detection voltage 1
Excess discharge detection voltage 2
Excess discharge reset voltage
Starting voltage
Overcurrent detection voltage
Overcurrent protection release
Excess discharge detection
non-induction time
Excessive current detection during
non-induction time
Overcurrent non-induction time
Operating limit voltage 2
V
ALML
V
ALM
V
S
1
V
S
2
V
ODR
V
ST
V
CS
4.050 4.150 4.240
150
2.50
2.30
2.78
-0.3
90
200
2.60
2.40
2.90
-0.1
100
110
250
2.70
2.50
3.02
V
mV
V
V
V
V
mV
load release (more than 5 MEG)
t
OD
t
OC
1
t
ALM
V
OP
V
GDH
V
GDL
1
V
GDL
2
I
OC
*
5.0
5.0
10.0
10.0
15.0
15.0
mS
mS
*
*
0.5
1.0
1.5
1.2
S
V
V
*
GD pin output voltage H
GD pin output voltage L1
GD pin output voltage L2
OC pin output current
V
CC
=V
IN
=3.5V
V
CC
=V
IN
=3.5V, V
CS
=0.5V
V
CC
=V
IN
=1.5V
V
CC
=V
IN
=4.5V, SW1 : b
V
CC
-0.3
V
CC
-0.1
0.1
0.2
0.3
0.4
-30
V
V
uA
*
1
*
2
Refer to input waveforms.
Operation is unstable below the operating limit voltage.
