MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Lithium Ion Battery Protection (for 1-cell in series)
Monolithic IC MM1491
Outline
This IC is a smaller, higher precision type of lithium ion battery protection IC as compared to the MM1301
series, and precision of ±25mV is guaranteed at 0°C ~ 50°C.
MM1301 had both V
CC
and V
IN
pins, but MM1491 has only the V
CC
pin.
Temperature conditions A:Ta=-25 ~ 75°C, B:Ta=-20 ~ 70°C, C:Ta=0 ~ 50°C,
D:Ta=0 ~ 40°C, E:Ta=-20 ~ 25°C
Overcharge
detection voltage
temperature
conditions
Overcharge
detection
hysteresis
voltage (V)
Overdischarge Overdischarge Overcurrent
detection
resumption
detection
voltage (V)
voltage (V)
voltage (mV)
1-Cell Protection ICs
Package
Model
SOT-26A
AN
BN
GN
HN
JN
MN
SN
WN
YN
ZN
Overcharge
detection
voltage (V)
MM1491
4.200±0.025
4.350±0.025
4.280±0.025
4.200±0.025
4.250±0.025
4.250±0.025
4.295±0.025
4.325±0.025
4.300±0.025
4.325±0.025
C
C
C
C
C
C
C
C
C
C
200±100
200±100
200±100
200±100
200±100
150±100
150±100
200±100
150±100
200±100
2.3±0.1
2.4±0.1
2.3±0.1
2.3±0.1
2.3±0.1
2.4±0.1
2.4±0.1
2.5±0.1
2.4±0.1
2.5±0.1
3.00±0.12
3.00±0.12
2.90±0.12
3.90±0.12
3.00±0.12
3.00±0.12
3.00±0.12
3.00±0.12
3.00±0.12
3.00±0.12
200±26
200±26
120±16
200±26
200±26
150±20
150±20
200±26
150±20
200±26
The series
*
Overchargewill continue to be expanded. and overcurrent detection voltage can be changed at the
and overdischarge voltages
*
customer's request.
Features
1. Overcharge detection voltage
Ta = 0 ~ +50°C
V
CEL
± 25mV
100 ms
2. Overcharge detection dead time
C
TD
= 0.01µF
10µA typ.
3. Consumption current (normal mode V
CEL
= 3.6V)
0.05µA typ.
4. Consumption current (overdischarge mode V
CEL
= 1.9V)
5. Overcurrent detection reset conditions
Load open: between both ends of battery pack
50MΩ typ. load
Package
SOT-26A
Applications
Lithium ion battery packs (for battery protection)
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Block Diagram
*
1: Over-discharge detection voltage
*
2: Over-charge detection voltage
Pin Assignment
1
2
6
5
4
3
4
1
2
3
5
6
SOT-26A
VM
V
CC
TD
CO
GND
DO
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Pin Description
PIN No. PIN Name
1
2
3
VM
V
CC
TD
TERMINAL EXPLANATIONS
Overcurrent detection input pin. Detects discharge current by connection to charging control
FET source pin.
Discharge current = (voltage between V
M
and GND) / (FET 2 ON resistance)
The positive source pin of this IC and connecting the positive terminal of the cell.
Setting the dead time of over-charge detection with the outer capacitor.
This pin drives the gate of the charge control N-ch FET, needs to connect resistor between
source and gate of FET.
Over-charge mode (when charging) : FET OFF
Over-charge mode (when discharging) : FET ON
Over-discharge mode (when discharging) : FET OFF
Over-discharge mode (when charging) : FET ON
Normal mode : FET ON
The ground pin of this IC and connecting the negative terminal of the cell.
This pin drives the gate of the discharge control N-ch FET.
Over-discharge mode : FET OFF
Over-discharge current mode : FET OFF
Over-charge mode : FET ON
Normal mode : FET ON
4
CO
5
GND
6
DO
* ·
Overcharge mode:
·
Normal mode:
·
·
Battery voltage > overcharge detection voltage
Overdischarge detection voltage < battery voltage <overcharge detection voltage
Discharge current < overcurrent detection level
Overdischarge mode: Overdischarge detection voltage > battery voltage
Overcurrent mode:
Discharge current > overcurrent detection level, voltage between V
M
and GND =
discharge current FET ON resistance
(discharge/charge control FET)
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Pin Description
Pin No. Pin name
1
V
M
Equivalent circuit diagram
Pin No. Pin name
5
GND
Equivalent circuit diagram
6
2
4
V
CC
CO
DO
3
TD
Absolute Maximum Ratings
Item
Storange temparature
Operating temparature
Supply voltage
Pin voltage
Allowable loss
(Ta=25°C)
Symbol
T
STG
T
OPR
V
CC
max.
V
CO
max.
V
VM
max.
P
D
Ratings
-40~+125
-20~+70
-0.3~+18
V
CC
-28~V
CC
200
Unit
°C
°C
V
V
mV
Recommended Operating Conditions
Item
Operating tempareture
Supply voltage
Symbol
T
OPR
V
OP
Ratings
-20~+70
+1.8~+10
Unit
°C
V
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1491
Electrical Characteristics
Item
Current consumption 1
(Condition : SET)
Current consumption 2
(Condition : IC only)
Current consumption 3
(FET : OFF on SET)
Current consumption 4
(FET : OFF on SET)
Current consumption 5
(Condition : SET)
Over-charge voltage
Over-charge hysterisis
Over-discharge voltage
Release over-discharge mode
Over-current detect level
Release over-current level
Condition of release over-current mode
Short detect level
Over-discharge dead time
Over-current dead time
Short detect delay time
Over-charge dead time
DO pin low level
DO pin source current 1
DO pin source current 2
DO pin sink current 1
DO pin sink current 2
CO pin source current 1
CO pin source current 2
Start trigger voltage
Over-voltage charger protection
OV charge minimum voltage
(Unless otherwise specified Ta=25°C, V
CC
=3.6V, model name MM1491B)
Measurement Conditions
V
CC
=3.6V : Set
between CO-GND : 910kΩ connected
V
CC
=3.6V : IC only
between CO-GND : 910kΩ connected
V
CC
=3.6V : Discharge FET OFF
between CO-GND : 910kΩ no connected
V
CC
=1.9V : Discharge FET OFF
between CO-GND : 910kΩ no connected
V
CC
=4.5V
between CO-BG : 910kΩ connected
Ta=0°C ~ 50°C
V
CC
: L
V
CC
: H
V
CC
: H
V
VM
: L
V
VM
: H
H
L
L
H
L
0.05
35
0.3
60
Min. Typ. Max. Unit
10.0
6.0
14.0
10.0
µA
µA
µA
µA
µA
V
mV
V
V
mV
mV
MΩ
V
15.0
15.0
0.20
150
V
CC
-30
ms
ms
ms
ms
V
µA
µA
µA
µA
-10
-5
0
-3.0
3.0
µA
µA
V
V
V
Symbol
I
CC1
I
CC2
I
CC3
I
CC4
I
CC5
V
ALM1
V
ALM1
V
ALM2
V
VMD
V
VMDF
V
VMSHT
t
ALM2
t
VMD
t
VMSHT
t
ALM1
V
GDH
I
DOH1
I
DOH2
I
DOL1
I
DOL2
I
CO1
I
CO2
V
ST
V
PRO
V
0V
4.325 4.350 4.375
100
2.30
2.88
174
200
2.40
3.00
200
130
50
1.3
7.0
10.0
10.0
0.02
50
100
-100
50
30
300
100
-20
-15
-0.2
-1.5
-0.1
-2.5
2.0
V
CC
-0.3 V
CC
-0.1
300
2.50
3.12
226
Load condition
VM : 0V
VM : 0V
0.5V
2V
7.0
C
TD
=0.01µF
V
CC
=3.6V
V
DO
=V
CC
-1.0V
V
DO
=V
CC
-0.3V
V
VM
>1.0V V
DO
=1.0V
V
VM
>1.0V V
DO
=0.3V
V
CO
=V
CC
-1.0V
V
CO
=V
CC
-0.3V
V
VM
: 0V
-0.5V
V
CC
=3.6V, between GND-VM voltage
V
CC
=0V, Charger voltage
2).
-0.40 -0.07
*
The overcurrent detection current value is Vvm/ (FET's on resistance
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