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
2. Current consumption (during constant current charging)
3. Current consumption (when charging is off)
4. Charging current
5. Charging shut-off voltage (Ta=-20~+70°C)
During discharging
1. Discharging shut-off voltage
2. Current consumption (I
L
-100µA, V
BATT
=3V)
3. Leak current during discharge shut-off
4. Voltage drop between battery and output (I
L
=100µA, V
BATT
=3V)
4.0~15.0V
100µA typ.
30µA typ.
4.5mA typ.
1177AF : 3.275V±75mV
1177BF : 3.0V±70mV
1.75V±0.15V
5µA typ.
0.1µA max.
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
2
8
7
6
5
3
4
5
1
2
3
4
6
7
SOP-8C
8
N.C
GND
NC
OUT2
OUT1
BATT
N.C
V
IN
MITSUMI
Charge and discharge control for coin-type lithium batteries and manganese dioxide lithium batteries MM1177
Block Diagram
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
input voltage
Charging voltage
Allowable power dissipation
Charging current
Discharging current
Symbol
T
STG
T
OPR
V
IN
max.
V
BAT
max.
P
D
I
BATT
I
L
Rating
-40~+125
-20~+70
18
3.5
300
10
1
Units
°C
°C
V
V
mW
mA
mA
Electrical Characteristics
Item
Input voltage operation range
Current consumption 1
Current consumption 2
Charging current (limiter current)
Limiter mode off
1177AF
1177BF
Charging OFF voltage
1177AF
1177BF
Current consumption (battery)
Leak current when discharging
is prohibited
Voltage when discharging is prohibited
Voltage drop between battery
and output
OUT2 pin voltage
(Unless otherwise specified Ta=25°C, V
IN
=12.0V)
Measurement Conditions
during charging (constant voltage charge)
charging off
V
IN
=4V~15V, V
BATT
=2V
I
BATT
=4mA
I
BATT
=0mA, Ta=-20~+70°C
I
L
=100µA, V
BATT
=3V
V
IN
=0V or open
V
BATT
=3.35V
after V
IN
=0FF
I
L
=100µA, V
BATT
=3V
V
CELL
=3V
2.85
1.60
1.75
75
2.92
4.0
3.00
2.70
3.20 3.275 3.35
2.93
3.00
5
3.07
8
0.1
1.90
100
3.00
Min
4.0
100
30
4.5
Typ. Max. Units
15.0
180
45
5.0
V
µA
µA
mA
V
V
V
µA
µA
V
mV
V
Symbol
V
INOPR
I
IN
1
I
IN
2
I
BATT
V
ICOFF
V
CHOFF
I
BA
1
I
BA
2
V
OOFF
V
CEOUT
V
OUT
2
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 50Ω 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
1. Charging current over 4mA
Application Example 2
2. Charging current under 4mA
Charging Characteristics
Battery voltage-Charging current characteristics
Charging current
Application
example 1
Battery voltage-Charging current characteristics
Charging current
Application example 2
Charging current
(MAX value)
Application
example 1
Battery voltage
3.275V
Vanadium lithium battery (MM1177A)
Battery voltage 2.8V 3V
Manganese dioxide lithium battery (MM1177B)
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