Mitsumi MM1414 Protection of lithium ion battery Datasheet

Protection of Lithium Ion Batteries MM1414
MITSUMI
Protection of Lithium Ion Batteries
Monolithic IC MM1414
Outline
This IC is use to protect lithium-ion batteries consisting of three or four cells. It adopts a compact package
and has the functions of previous models, with functions for overcharge detection, overdischarge detection
and overcurrent detection. A dead time can be set externally.
Features
1. Overcharge detection voltage accuracy
±25mV/cell
2. Consumption current (Vcell=4.4V)
50µA typ.
3. Consumption current (Vcell=3.5V)
23µA typ.
4. Consumption current (Vcell=1.8V)
2µA typ.
5. Overcharge sensing dead time: can be set externally
6. PF detection: warning signal when cell voltage falls
Package
TSOP-20A
Applications
IC for protection of lithium-ion batteries consisting of three or four cells
Pin Assignment
20 19 18 17 16 15 14 13 12 11
1 2 3 4 5 6 7 8 9 10
TSOP-20A
1
OV
11
SEL
2
N.C
12
N.C
3
CS
13
CON
4
N.C
14
N.C
5
DCHG
15
V1
6
N.C
16
V2
7
CDC
17
V3
8
COL
18
V4
9
COV
19
N.C
10
GND
20
VCC
MITSUMI
Block Diagram
Protection of Lithium Ion Batteries MM1414
Protection of Lithium Ion Batteries MM1414
MITSUMI
Pin Description
Pin No. Pin name
I/O
Functions
Overcharge detection output pin
1
OV
Output
NPNTr open collector output
Normal: high impedance
Overcharge: Low
2
N.C
Not connected
Overcurrent detection pin
Monitors load current equivalently by the voltage drop between discharge control
3
CS
Input
FET source and drain, and makes DCHG pin high when the voltage goes below
overcurrent detection voltage, turning off discharge control FET. After
overcurrent detection, current flows from this pin and when there is a light load,
overcurrent mode is released. This function does not operate in discharge mode.
4
N.C
Not connected
Discharge control FET (P-ch) drive pin
5
DCHG
Output
Normal: Low
Overdischarge: High
6
N.C
Not connected
7
CDC
Input
8
COL
Input
9
COV
Input
10
GND
Input
11
SEL
Input
12
N.C
Overdischarge detection dead time setting pin
Dead time can be set by connecting a capacitor between CDC pin and ground.
Overcurrent detection dead time setting pin
Dead time can be set by connecting a capacitor between COL pin and ground.
Overcharge detection dead time setting pin
Dead time can be set by connecting a capacitor between COV pin and ground.
Ground pin
3 cell switch pin
SEL pin = GND: 3 cell (no V1 cell detection)
SEL pin = VCC: 4 cell
Not connected
Discharge FET ON/OFF pin
13
CON
Input
CON pin low; DCHG pin low
CON pin high; DCHG pin high
14
N.C
Not connected
15
V1
Input
V1 cell high side voltage input pin
16
V2
Input
V2 cell high side voltage and V3 cell low side voltage input pin
17
V3
Input
V3 cell high side voltage and V4 cell low side voltage input pin
18
V4
Input
V4 cell high side voltage input pin
19
N.C
20
VCC
Not connected
Input
Power supply input pin
Protection of Lithium Ion Batteries MM1414
MITSUMI
Pin Description
Equivalent circuit diagram
Equivalent circuit diagram
1 ; OV
9 ; COV
3 ; CS
11 ; SEL
5 ; DCHG
13 ; CON
7 ; CDC
15 ; V1
8 ; COL
16 ; V2
Protection of Lithium Ion Batteries MM1414
MITSUMI
Equivalent circuit diagram
Equivalent circuit diagram
17 ; V3
18 ; V4
Absolute Maximum Ratings
(Ta=5°C)
Item
Symbol
Ratings
Unit
Storage temperature
TSTG
-40~+125
°C
Operating temperature
TOPR
-20~+70
°C
Power supply voltage
VCC max.
-0.3~24
V
OV pin impressed voltage
VOV max.
-0.3~24
V
SEL pin impressed voltage
VSEL max.
-0.3~24
V
CON pin impressed voltage
VCON max.
-0.3~24
V
Allowable loss
Pd
300
mW
Recommended Operating Conditions
Item
Symbol
Ratings
Unit
Operating temperature
TOPR
-20~+70
°C
Operating voltage
VOPR
+1.8~+24
V
Protection of Lithium Ion Batteries MM1414
MITSUMI
Electrical Characteristics
(Except where noted otherwise, Ta=25°C, VCC=V4+V3+V2+V1, VCEL=3.5V, CON=0V, SEL=0V)
Item
Symbol
Measurement conditions
Consumption current (VCC pin) 1
ICC1
VCELL=4.4V, CON=0V
55
110
µA
Consumption current (VCC pin) 2
ICC2
VCELL=3.5V, CON=0V
27
50
µA
Consumption current (VCC pin) 3
ICC3
VCELL=1.8V, CON=0V
2
4
µA
Consumption current (VCC pin) 4
ICC4
VCELL=3.5V, CON=VCC
12
20
µA
Consumption current (VCC pin) 5
ICC5
VCELL=1.8V, CON=VCC
1
2
µA
Consumption current (V4 pin) 1
I1V4
VCELL=4.4V
10
20
µA
Consumption current (V4 pin) 2
I2V4
VCELL=3.5V
8
15
µA
Consumption current (V4 pin) 3
I3V4
VCELL=1.8V
2.5
5.0
µA
V3 pin input current
IV3
VCELL=3.5V
±300
nA
V2 pin input current
IV2
VCELL=3.5V
±300
nA
V1 pin input current
IV1
VCELL=3.5V
±300
nA
Overcharge detection voltage
VCELLU
Overcharge hysteresis voltage
VU
Overcharge sensing dead time
tOV
Overdischarge detection voltage
VCELLS
Discharge resume voltage
VCELLD
VCELL : 4.2V
4.4V
VCELL : 4.2V
4.4V
Min. Typ. Max. Unit
A, C 4.325 4.350 4.375
3.9V
140
200
260
mV
0.5
1.0
1.5
S
A, B
1.90
2.00
2.10
C, D
2.20
2.30
2.40
2.85
3.00
3.15
A, B
0.75
1.00
1.25
C, D
0.45
0.70
0.95
COV=0.1µF
VCELL : 3.5V
1.8V
VCELL : 1.8V
V
B, D 4.225 4.250 4.275
3.5V
VCELLD-VCELLS
V
V
Overdischarge hysteresis voltage
VDS
Overdischarge sensing dead time
tCDC
CDC=0.1µF
0.5
1.0
1.5
S
Overcurrent detection voltage
VOC
VCC-VCS, DCHG
135
150
165
mV
20
40
mV
10
15
mS
1.5
3.0
mS
10
15
mS
Overcurrent hysteresis voltage
VOC
Overcurrent sensing dead time 1
tCOL1
COL=0.001µF
Overcurrent sensing dead time 2
tCOL2
COL=0.001µF, VCC-CS>1.0V
Overcurrent sensing dead time 3
tCOL3
COL=0.001µF
Overcurrent reset conditions
5
5
V
Load release conditions 500kΩ
DCHG pin source current
ISODCH
VCELL=1.8V, SW1 : A VDCHG=VCC-0.8V
20
µA
DCHG pin sink current
ISIDCH
VCELL=3.5V, SW1 : A VDCHG=0.8V
20
µA
DCHG pin output voltage H
VTHDCH
VCC-VDCHG, ISO=20µA, SW1 : B
0.8
V
DCHG pin output voltage L
VTHDCL
VDCHG-GND, ISI=-20µA, SW1 : B
0.8
V
OV pin sink current
ISIOV
VOV=0.4V, Ta=-20~+70°C
OV pin leak current
ILKOV
VOV=24V
0.1
µA
CON pin L voltage
DCHG= "High"
0.4
V
CON pin H voltage
DCHG= "Low"
CON pin current
VCELL=3.5V, CON=0.4V
SEL pin L voltage
for 3 cell
SEL pin H voltage
for 4 cell
SEL pin current
VCELL=3.5V, SEL=0.4V
100
µA
VCC-0.4
V
1
2
µA
0.4
V
VCC-0.4
V
1
2
µA
Protection of Lithium Ion Batteries MM1414
MITSUMI
Measuring Circuit
Timing Chart
For overcharge
Charge OFF
Overcharge detection voltage
Cell voltage
Overcharge release voltage
COV pin
Sensing dead
OV pin (for pull up)
Normal state
Overcharge
Normal state
Protection of Lithium Ion Batteries MM1414
MITSUMI
For overdischarge
Discharge OFF
Charge start
Discharge resume voltage
Overdischarge
Cell voltag detection voltage
CON pin
Sensing
dead
CDC pin
DCHG pin
Normal state
Normal state
External control
Overdischarge
Normal state
Normal state Normal state
For overcurrent
Overcurrent
Load release
Current flows
from CS pin
CS pin
COL pin
Sensing dead
Reset dead
DCHG pin
Normal state
Overcurrent
Normal state
Protection of Lithium Ion Batteries MM1414
MITSUMI
Application Circuit
Characteristics
Overcharge & Overdischarge Sensing Dead Times
Overcurrent Sensing Dead Time 1,
Overcurrent Reset Dead Time
100
Dead time (mS)
Dead time (S)
10
1
0.1
0.01
0.001
0.01
0.1
1
Pin capacitance (µF)
10
1
100
1000
COL pin capacitance (pF)
Overcurrent Sensing Dead Time 2
Overcurrent Sensing
Dead Time 2 (mS)
100
10
1
0
100
1000
10000
COL pin capacitance (pF)
Note: The above characteristics are representative values only, and are not guaranteed.
10000
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