MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Lithium Ion Battery Protection (for 1-cell in series)
Monolithic IC MM1446
Outline
This IC is a lithium ion battery protection IC that adds control using a fuse to the method of overcurrent
detection control used in the familiar MM1301 series. An OSI pin (charge control pin) also has been provided.
1-Cell Protection ICs
Package
Model
VSOP-8B
BW
CW
DW
EW
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)
Overcharge
detection
voltage (V)
MM1446
4.270±0.030
4.270±0.030
4.180±0.030
4.280±0.030
C
C
C
C
100±30
100±30
110±30
110±30
2.55±0.05
2.55±0.05
2.50±0.05
2.50±0.05
3.70
3.70
3.10±0.078
3.10±0.078
39.0±4.5
52.0±4.5
39.0±4.5
39.0±4.5
The series
*
Overchargewill continue to be expanded. and overcurrent detection voltage can
voltages
*
be changed and overdischargerequest.
at the customer's
Features
1. Overcharge detection voltage
Ta = 0 ~ +50°C
V
CEL
±30mV
2. Overcharge detection dead time
C
TD
= 0.1µF
1.0 sec
3. Consumption current (normal mode V
CEL
= 3.5V)
14µA typ.
0.2µA typ.
4. Consumption current (overdischarge mode V
CEL
= 1.9V)
5. Overcurrent protection release
Load open: between both ends of battery pack
load of 500MΩ or higher
Package
VSOP-8B
Applications
Lithium ion battery packs (for battery protection)
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Block Diagram
*
1: Over-discharge detection voltage
*
2: Over-charge detection voltage
Pin Assignment
1
2
8
7
6
5
3
4
1
2
3
4
5
6
SOP-8B
7
8
GND
CS1
GD
CS2
OC2
TD
OC1
V
CC
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Pin Description
PIN No. PIN Name
1
GND
Function
Negative power supply for this IC. Also act as detection voltage pin for the battery
connected between Vcc-GND.
Detection pin for voltage between CS1-GND.
When CS1 is connected with the Source of discharge FET, Detects overcurrent using an
external resistor and discharge current.
When CS1 is connected with CS2(4PIN), and connects with the Dorein of charge and
discharge FET, Detects overcurrent using an On state resistor of discharge control FET
and discharge current.
Dischage Current=CS1-GND Voltage / External Resistor
CS1-GND Voltage / On state resistance of discharge control FET
N-ch FET gate connection pin for discharge control. Switchesgate OFF when
overdischarge is detected, and for current protection. Swicthes gate ON when overcharge
is detected, and in normal state.
Detection pin for overcurrent mode release and start-up voltage.
Detected load release resets from overcurrent mode. When the battery is being charged
and the Voltage between CS2-GND during overdischarge mode falls bellow start-up
voltage, the bias current is drained to the interior circuit and operating status result.
Control pin for N-ch FET for charge control. Switches FET OFF by activating an external
transistor when overcharge is detected.
This operation continues until the voltage falls bellow overcharge release voltage.
Overcharge detection dead time setting pin.
=
T
ARAM
.. 10.0 C
TD
(sec)
C
TD
: TD pin external capacitance value (µF)
Overcharge detection output (input) pin. For overcharge detection, output goes high without
dead time set by TD pin. (Hysteresis does not go on until OC2 output goes high.)
Charging control FET is turned off by the OC2 pin when OC1 pin input is high.
Positive power supply for this IC. Also act as detection voltage pin for the battery connected
between Vcc-GND.
2
CS1
3
GD
4
CS2
5
OC2
6
TD
7
OC1
8
V
CC
Overcharge Mode : Battery Voltage > Overcharge Det. Voltage
Nomal Mode : Overdischarge Det. Voltage < Battery Voltage < Overcharge Det. Voltage
Discharge Current < Overcurrent Det. Voltage / External Det. resistor
Overdischarge Mode : Overdischarge Det. Voltage > Battery Voltage
Overcurrent Mode : Discharge Current > Overcurrent Det. Voltage / External Det. Resistor
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Absolute Maximum Ratings
Item
Storage temperature
Operating temperature
Supply voltage
OC1 Terminal Voltage
CS1 Terminal Voltage
OC2 Terminal Voltage
CS2 Terminal Voltage
Allowable loss
(Ta=25°C)
Symbol
T
STG
T
OPR
V
CC
max.
V
OC1
max.
V
CS1
max.
V
OC2
max.
V
CS2
max.
P
D
Ratings
-40~+125
-20~+70
-0.3~+12
-0.3~V
CC
-0.6~V
CC
170 (Alone)
Unit
°C
°C
V
V
V
mW
Recommended Operating Conditions
Item
Operating Temperature
Supply Voltage
Symbol
T
OPR
V
OP
Ratings
-20~+70
+0.9~+12
Unit
°C
V
Electrical Characteristics
Item
Current Consumption 1
(Overcharge Mode)
Current Consumption 2
(Nomal Mode)
Current Consumption 3
(Overdischarge Mode)
Current Consumption 4
(Overdischarge Mode)
Current Cosumption 5
(OC1 Output)
Overcharge
Detection Voltage
Overcharge Release Voltage
Overcharge Hysteresis Voltage
Overdischarge
Detection Voltage
Overdischarge
Resumption Voltage
(Unless otherwise specifiedTa=25°C, model name MM1446E)
Measurement Conditions
V
CC
=4.5V R
OC1
,
OC2
=∞
V
CC
=3.5V
V
CC
=1.9V
V
CC
=1.9V (Ta=70°C)
Min. Typ. Max. Unit
150
14
0.2
0.5
250
20
0.5
0.8
µA
µA
µA
µA
Symbol
I
CC1
I
CC2
I
CC3
I
CC4
I
CC5
V
ALM
V
ALML
V
ALM
V
OD
V
ODF
Start-up Voltage
Overcurrent
Detection Voltage
Overcurrent Protection Release
V
ST
V
CS1
V
CC
=4.5V, V
TD
=0V
45
µA
R
OC1
=∞
Ta=0°C ~ 50°C
4.250 4.280 4.310 V
V
CC
=4.0V 4.5V, V
OC1
,
2
: L H
V
CC
=4.5V 4.0V, V
OC1
,
2
: H L
4.120 4.170 4.220 V
V
ALM
-V
ALML
80
110 140 mV
V
CC
=3.0V 2.0V
2.45 2.50 2.55
V
V
GD
: H L
V
CC
=2.0V 4.0V
3.022 3.10 3.178 V
V
GD
: L H
(
*
1)
(V
CC
>Overdischarge Release Voltage) or
(Charge and V
CC
>Overdischarge detection voltage.)
V
CC
=2.7V
-0.4 -0.1
V
V
CS2
: 0V -0.5V, V
GD
: L H
V
CS1
: 0V -0.2V,
34.5 39.5 43.5 mV
V
GD
: H L
Load release (500MEGΩ min.)
MITSUMI
Lithium Ion Battery Protection (for 1-cell in series) MM1446
Item
Overdischarge Detection
Delay Time
Overcurrent Detection
Delay Time 1
Overcurrent Detection
Delay Time 2
Overcharge Detection
Delay Time 1
Overcharge Detection
Delay Time 2
Operating Limit Voltage ( 2)
GD Terminal Output Voltage H
GD Terminal Output Voltage L1
GD Terminal Output Voltage L2
Symbol
t
OD
t
CS1
t
CS2
t
ALM1
t
ALM2
V
OP
V
GDH
V
GDL1
V
GDL2
I
OC1
I
OC2
*
Measurement Conditions
V
CC
=3.0V 2.0V ( 1),
V
GD
: H L
CIRCUIT2, SW1 : a, SW2 : b, SW3 : b
V
CS1
=0V 0.2V ( 1),
V
GD
: H L
CIRCUIT2, SW1 : a, SW2 : b, SW3 : b
V
CS2
=0V 1.0V ( 1) ,
V
GD
: H L
CIRCUIT2, SW1 : b, SW2 : a, SW3 : b
V
CC
=4.0V 4.5V ( 1) ,
C
TD
=0.1µF, V
OC2
: L H
CIRCUIT2, SW1 : a, SW2 : b, SW3 : b
V
CC
=4.0V 4.5V ( 1) ,
V
OC1
: H L
CIRCUIT2, SW1 : a, SW2 : b, SW3 : b
V
CC
when V
GDL2
>0.4V
Min. Typ. Max. Unit
5.0
10.0
15.0
ms
*
*
5.0
10.0
15.0
ms
*
100
µs
*
*
0.5
1.0
1.5
s
100
1.2
V
CC
-0.3 V
CC
-0.1
0.1
0.2
0.3
0.4
-30
-500
µs
V
V
V
V
µA
µA
OC1 Terminal Output Current
OC2 Terminal Output Current
V
CS2
>1.0V
V
CC
=1.5V
V
CC
=4.5V, V
OC1
=1.6V
CIRCUIT1, SW1 : b, SW2 : a
V
CC
=4.5V, V
OC1
=0V
CIRCUIT1, SW1 : a, SW2 : b
( 1) Refer to input waveforms.
( 2) Operation is unstable below the operating limit voltage.
*
*
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