MITSUMI
Charge and discharge control for coin-type lithium batteries and manganese dioxide lithium batteries MM1177
Charge and discharge control for coin-type lithium batteries and
manganese dioxide lithium batteries
Monolithic IC MM1177
Outline
This IC controls constant current charging and excess discharge for coin-shaped vanadium lithium batteries
and manganese dioxide batteries. It performs constant current charging, stops charging at set voltages, and
prevents excess discharging. When the voltage falls bellow a set level, it prohibits discharges and reduces IC
current consumption nearly to zero.
Features
During charging
1. Input voltage range
4.0~15.0V
2. Current consumption (during constant current charging)
100A typ.
3. Current consumption (when charging is off)
30A typ.
4. Charging current
4.5mA typ.
5. Charging shut-off voltage (Ta=-20~+70C)
1177AF : 3.275V75mV
1177BF : 3.0V70mV
During discharging
1. Discharging shut-off voltage
1.75V0.15V
2. Current consumption (I
L
-100A, V
BATT
=3V)
5A typ.
3. Leak current during discharge shut-off
0.1A max.
4. Voltage drop between battery and output (I
L
=100A, V
BATT
=3V)
2.92V typ.
Package
SOP-8C (MM1177AF, MM1177BF)
Applications
1. coin-shaped vanadium lithium batteries
2. Monitors and controls charging and discharging for and manganese dioxide batteries.
Pin Assignment
1
N.C
2
GND
3
NC
4
OUT2
5
OUT1
6
BATT
7
N.C
8
V
IN
1
4
3
2
8
5
6
7
SOP-8C
MITSUMI
Charge and discharge control for coin-type lithium batteries and manganese dioxide lithium batteries MM1177
Block Diagram
Absolute Maximum Ratings
Item
Symbol
Rating
Units
Storage temperature
T
STG
-40~+125
C
Operating temperature
T
OPR
-20~+70
C
input voltage
V
IN
max.
18
V
Charging voltage
V
BAT
max.
3.5
V
Allowable power dissipation
P
D
300
mW
Charging current
I
BATT
10
mA
Discharging current
I
L
1
mA
Electrical Characteristics
(Unless otherwise specified Ta=25C, V
IN
=12.0V)
Item
Symbol
Measurement Conditions
Min
Typ. Max. Units
Input voltage operation range
V
INOPR
4.0
15.0
V
Current consumption 1
I
IN
1
during charging (constant voltage charge)
100
180
A
Current consumption 2
I
IN
2
charging off
30
45
A
Charging current (limiter current)
I
BATT
V
IN
=4V~15V, V
BATT
=2V
4.0
4.5
5.0
mA
Limiter mode off
1177AF
V
ICOFF
I
BATT
=4mA
3.00
V
1177BF
2.70
Charging OFF voltage
1177AF
V
CHOFF
I
BATT
=0mA, Ta=-20~+70C
3.20 3.275 3.35
V
1177BF
2.93
3.00
3.07
V
Current consumption (battery)
I
BA
1
I
L
=100A, V
BATT
=3V
5
8
A
Leak current when discharging
I
BA
2
V
IN
=0V or open
is prohibited
V
BATT
=3.35V
0.1
A
Voltage when discharging is prohibited
V
OOFF
after V
IN
=0FF
1.60
1.75
1.90
V
Voltage drop between battery
V
CEOUT
I
L
=100A, V
BATT
=3V
75
100
mV
and output
OUT2 pin voltage
V
OUT
2
V
CELL
=3V
2.85
2.92
3.00
V
Note : Do not connect the OUT2 pin to the load; it does not have current supply capability.
To delay discharge prohibition, or suppress discharge prohibition caused by noise, connect a capacitor
between the OUT2 pin and GND.
MITSUMI
Charge and discharge control for coin-type lithium batteries and manganese dioxide lithium batteries MM1177
Operation Outline
The constant current, constant voltage charging control charges at a constant current of 4.5mA, until battery
capacity reaches 0%~90%. It then switches to constant voltage control and sets the charge current to "0"
when 100% charged. Output impedance is set at about 50
so charge current gradually drops and eventually
reaches 0mA. The charging current maximum value is set by battery capacitance. Therefore, When the value
falls below 4.5mA, insert a resistor (R) in series in order to lower charging current value.
The discharging control has a built-in switching circuit between the battery and output. After switching off
during excess discharge, all circuit operations are prohibited. Operation reset is achieved by resuming
charging. In the event of an output short, output current is limited (about 5mA~10mA) by the internal switch
function. This reduces the risk of battery heat emission caused by an output short. Also, the switching circuit
and the battery voltage monitoring switch are on different systems. This means that the discharge output
(OUT1) will not prohibit discharge even during a short, and noise from the output load section will not affect
the detection circuit (OUT2).
Application Example
Application Example 1
Application Example 2
Charging Characteristics
Application
example 1
3.275V
Battery voltage
Charging current
Vanadium lithium battery (MM1177A)
Application
example 1
Application example 2
3V
Battery voltage
Manganese dioxide lithium battery (MM1177B)
2.8V
Charging current
(MAX value)
Charging current
1. Charging current over 4mA
2. Charging current under 4mA
Battery voltage-Charging current characteristics
Battery voltage-Charging current characteristics
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