MITSUMI
Control of Lithium Ion Battery Charging and Discharging MM1214
Control of Lithium Ion Battery Charging and Discharging
Monolithic IC MM1214
Outline
This IC controls constant current charging and excess discharge for lithium-ion batteries (sub-batteries). It
performs constant current charging, stops charging at set voltages, and prevents excess discharging. When
the voltage falls below a set level, it prohibits discharges and reduces IC current consumption nearly to zero.
Features
During charging
1. Input voltage range
4.5V~15.0V
2. Current consumption (V
IN
pin)
V
BATT
<4.1V
9mA typ.
3. Current consumption (V
CC
pin)
I
BATC
=0mA
500A typ.
4. Charging current switching voltage
2.7V0.1V
5. Charging current (normal conditions)
105mA typ.
6. Charging current (low voltages)
5.0mA typ.
7. Charging control voltage (Ta =-20~+70C)
4.200V0.063V
8. Overvoltage detection voltage (Ta =-20~+70C)
4.335V0.065V
9. Overvoltage reset voltage
3.50V0.13V
10.Overvoltage detection non-induction time
C
CC
=2.22F
0.80S typ.
11.Overvoltage reset non-induction time
C
CC
=0.22F
0.80S typ.
During discharging
12.Current consumption (Vbat pin)
I
L
=10mA
450A typ.
13.Current consumption (Vbat pin)
I
L
=0mA
15A typ.
14.Current consumption (Vbat pin) discharging off, : V
BAT
<2.4V
0.1A max.
15.Excess discharging detection voltage
2.30V0.19V
16.Discharge resumption voltage
2.70V0.1V
17.Voltage drop between battery and output (V
BATT
=3.0V, I
L
=-10mA)
70mV typ.
18.Voltage drop between battery and output (I
L
=100A, V
BATT
=3V)
2.92V typ.
Package
SSOP-16A (MM1214XF)
Application
For overnight charging
MITSUMI
Control of Lithium Ion Battery Charging and Discharging MM1214
Pin Assignment
1
GND
9
V
O
2
2
N.C
10
V
O
1
3
T
CH
11
V
BAT
4
CD
12
N.C
5
N.C
13
V
IN
6
N.C
14
N.C
7
N.C
15
V
CC
8
V
OV
16
N.C
SSOP-16A
1
3
7
6
2
4 5
8
16
13
11
15 14
12
9
10
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
INN
max.
18
V
Power supply voltage
V
CC
max.
18
V
Battery voltage
V
BAT
max.
4.4
V
VOV pin applied voltage
V
VOV
max.
10
V
TCH pin applied voltage
V
TCH
max.
10
V
Charging current
I
CHG
max.
-150
mA
Output current
I
BAT
max.
-30
mA
Allowable power dissipation 1
Pd1
500
mW
Allowable power dissipation 2 (Note 1)
Pd2
1000
mW
Note 1 : When mounted on glass epoxy board (10 25 0.8) Plated area 80% (Refer to Fig.1)
MITSUMI
Control of Lithium Ion Battery Charging and Discharging MM1214
Electrical Characteristics
(Unless otherwise specified Ta=25C, V
CC
, V
IN
=6.5V)
Note 2 : During rapid charging, use 5.5 V Vin power supply.
Note 3 : V
O2
has no current supply capacity, so do not connect load.
Item
Symbol
Measurement Conditions
Min. Typ. Max. Units
Charging input operation range 1
V
INOPR
1
During low-current charging (Note 2)
4.50
(15.0)
V
Charging input operation range 2
V
INOPR
2
During rapid charge
4.50
5.5
V
Power supply input operation range
V
CCOPR
Charging OFF
4.50
15.0
V
Current consumption (V
IN
pin)
I
IN
V
BAT
< 4.1V
9
12
mA
Current consumption (V
CC
pin)
I
CC
I
BATC
=0mA
500
750
A
Current consumption (V
BAT
pin) 1
I
BAT
1
I
L
=10mA, V
CC
=0V, V
BATT
=3V
450
550
A
Current consumption (V
BAT
pin) 2
I
BAT
2
I
L
=0mA, V
CC
=0V, V
BATT
=3V
15
30
A
Current consumption (V
BAT
pin) 3
I
BAT
3
V
BAT
< 2.4V (Discharging OFF), V
CC
=0V
0.1
A
Charge control voltage
V
BATC
Ta=-20~+70C
4.137
4.200
4.263
V
Overcharge detection voltage
V
BATU
Ta=-20~+70C
4.270
4.335
4.400
V
Overcharge reset voltage
V
BATO
V
BATT
=4.5V 3.0V
3.37
3.50
3.63
V
Detection voltage margin 1
V
UC
V
BATU
-V
BATC
, Ta=-20~+70C
100
135
mV
Charge current conversion voltage
V
CH
V
BATT
=2.0V 3.0V
2.60
2.70
2.80
V
Charge hysteresis voltage
V
CH
V
BATT
=3.0V 2.0V
300
400
500
mV
Charge current (During low voltage)
I
TCH
V
BATT
< V
CH
-
V
CH
-6.5
-5.0
-3.5
mA
Charge current (Normal)
I
BATC
1
4.0V > V
BAT
> V
CH
-115 -105
-95
mA
Charge current 1 (Normal)
I
BAT1CT
Ta=-20~+70C, V
IN
=4.5V~5.5V
-120 -105
-90
mA
Charge current 2 (Normal)
I
BAT2CT
Ta=-20~+70C, V
IN
=4.5V~6.5V
-125 -105
-90
mA
Charge with constant current mode OFF
I
BATC
2
V
BAT
=4.0V
-115
-80
mA
Excess discharging detection voltage
V
BATS
V
BATT
=3.0V 2.0V
2.11
2.30
2.49
V
Discharge resumption voltage
V
BATD
V
CC
> 4.5V
2.60
2.70
2.80
V
Voltage drop between battery and output
V
CE
V
BAT
=3.0V, I
L
=10mA
70
100
mV
VOV pin sink current
I
SIVOV
V
BATT
=4.4V, V
VOV
=0.4V
1.00
4.00
mA
VOV pin leak current
I
LVOV
V
BAT
=4.0V
0.1
A
VOV pin output voltage
V
VOV
I
VOV
=1mA
0.25
0.35
V
TCH pin sink current
I
SITCH
V
BAT
=2.0V, V
TCH
=0.4V
1.00
4.00
mA
TCH pin leak current
I
LTCH
V
BAT
=3.0V
0.1
A
TCH pin output voltage
V
TCH
I
TCH
=1mA
0.25
0.35
V
CD pin charge current
I
CDC
V
CD
=1.5V, V
BAT
=4.4V
-800 -600 -400
nA
CD pin discharge current
I
CDDC
V
CD
=1.5V, V
BAT
=3.0V
500
680
860
nA
CD pin H voltage
V
CDH
V
BATT
=4.5V
2.65
2.90
3.15
V
CD pin threshold voltage 1
V
THC
1
V
CD
=3V 0V
0.65
0.73
0.91
V
CD pin threshold voltage 2
V
THC
2
V
CD
=0V 3V
2.00
2.35
2.70
V
Overvoltage detection non-induction time
t
DCD
1
C
CD
=0.22F
0.40
0.80
1.60
S
Overvoltage reset non-induction time
t
DCD
2
C
CD
=0.22F
0.40
0.80
1.60
S
MITSUMI
Control of Lithium Ion Battery Charging and Discharging MM1214
Charcteristics
PD
[mW]
1200
1000
800
600
400
200
25
50
70
100
125
TEMP [
C]
SSOP-16A
When mounted on glass epoxy base (10 25 0.8 [mm])
Prated area 80%
Fig.1
Application Circuits
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