MITSUMI
Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077
Protection of Lithium Ion/Lithium Polymer Battery(one cell)
Monolithic IC MM3077
Outline
This protection IC was developed for use with lithium-ion/lithium polymer secondary 1-cell serial batteries.
It detects overcharge, overdischarge, discharge overcurrent and other abnormalities, and functions to protect
the battery by turning off the external FET-SW.
The IC also has a built-in timer circuit (for detection delay times), so fewer external parts can be used in
protection circuit configuration.
Features
(1) High withstand voltage CMOS process used Charger connection absolute maximum rating 28V
(2) High electrostatic tolerance
20kV (150pF, 330Ω aerial, contact discharge)
(3) Detection voltage precision
Overcharge detection precision ±25mV (0 ~ 50°C)
Discharge overcurrent detection precision ±10mV
Overdischarge detection precision ±58mV
(4) Built-in detection delay time (timer circuit)
Overcharge detection delay time 0.25 ~ 7.0s (mask option)
Overdischarge detection delay time 4.0 ~ 32.0ms (mask option)
Discharge overcurrent detection delay time 4.0 ~ 32.0ms (mask option)
Short detection delay time 400µs
(5) Includes detection function for too large charger Detection voltage for too large charger 8.0V
(6) Setting DS pin
At V
DD
level allows shortening of overcharge, excess discharge,
discharge overcurrent detection and reset delay time.
(7) OV charging prohibition function (mask option)
Package
SOT-26
SON-6
Applications
Lithium-ion/lithium polymer battery protection circuits
MITSUMI
Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077
Block diagram
V
DD
2
DS
4
Oscillator
VD1
Counter
Logic Circuit
Over-charge
Delay
VD2
Over-discharge
VD3
Level Shift
Short
Logic Circuit
Over-discharge
Current
3
V
SS
1
D
OUT
5
C
OUT
6
V–
Pin Assignment
D
OUT
V
DD
V
SS
1
2
3
6
5
4
V–
C
OUT
DS
1
2
3
4
5
6
D
OUT
V
DD
V
SS
DS
C
OUT
V–
Pin Description
Pin No. Pin Name
1
2
3
4
5
6
D
OUT
V
DD
V
SS
DS
C
OUT
V–
V
DD
terminal. Connected to IC substrait.
V
SS
terminal. Connected to IC ground.
Delay shorten terminal.
Over charge detection Output. Output type is CMOS.
Charger negative voltage input.
Function
Over discharge detection Output. Output type is CMOS.
MITSUMI
Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077
Absolute maximum ratings
Item
Supply voltage
Charger minus pin input voltage
DS pin input voltage
C
OUT
pin output voltage
D
OUT
pin output voltage
Operating temperature
Storage temperature
(T
OPR
=25°C, V
SS
=0V)
Symbol
V
DD
V–
V
DS
VC
OUT
VD
OUT
T
OPR
T
STG
Rating
–0.3 ~ 12
V
DD
–28 ~ V
DD
+0.3
V
SS
–0.3 ~ V
DD
+0.3
V
DD
–28 ~ V
DD
+0.3
V
SS
–0.3 ~ V
DD
+0.3
–40 ~ +85
–55 ~ +125
Unit
V
V
V
V
V
ºC
ºC
Electrical characteristics
Parameter
Operating input voltage
Minimum operating voltage for 0V charging
Over-charge detection voltage
Over-charge release voltage
Over-charge release delay time
Over-discharge detection voltage
Over-discharge detection delay time
Over-discharge release delay time
Over-discharge current detection voltage
Over-discharge current release delay time
Short detection voltage
Short detection delay time
Over-discharge current release resistance
DS pin "H"input voltage
DS pin pull-down resistance
C
OUT
pin Nch ON voltage
C
OUT
pin Pch ON voltage
D
OUT
pin Nch ON voltage
D
OUT
pin Pch ON voltage
Current consumption
Current consumption at stand-by
Over voltage charger detection voltage
Over voltage charger release voltage
(T
OPR
=25°C)
Conditions
V
DD
–V
SS
V
DD
–V–, V
DD
–V
SS
=0V
R1=330Ω T
OPR
=0 ~ 50ºC, *1
V
DD
=3.6V
V
DD
=4.4V
V
DD
=3.6V
4.4V
3.6V
2.2V
0V
1V
0V
3V
R1=330Ω
Detect falling edge of supply voltage
V
DD
=3V, V–=3V
V
DD
=3V, V–=0V
V
DD
=3V, V–=3V
V
DD
=3V
V
DD
=3V, V–=0V
V
DD
=3.6V, V–=1V
V
DD
=3.6V
I
OL
=50µA, V
DD
=4.5V
I
OH
=50µA, V
DD
=3.9V
I
OL
=50µA, V
DD
=2.0V
I
DD
=50µA, V
DD
=3.9V
V
DD
=3.9V, V–=0V
V
DD
=2.0V
V
DD
=3.6V
V
DD
=3.6V
6.0
5.3
8.0
7.3
3.4
3.4
0.7
5.6
16.8
2.8
8.4
2.8
250
30
V
DD
–0.5
6.5
13.0
0.4
3.7
0.2
3.7
3.0
6.0
0.1
10.0
9.3
0.5
1.0
8.0
24.0
4.0
12.0
4.0
400
50
min.
1.5
typ.
max.
10.0
1.2
4.275 4.300 4.325
1.3
10.4
31.2
5.2
15.6
5.2
600
100
V
DD
+0.3
26.0
0.5
4.050 4.100 4.150
2.242 2.300 2.358
Unit
V
V
V
s
V
ms
V
ms
ms
V
ms
ms
V
µs
kΩ
V
kΩ
V
V
V
V
µA
µA
V
V
*2
A
A
B
B
B
B
D
D
E
F
F
F
F
F
F
H
H
I
J
K
L
M
M
G
G
Symbol
V
DD
1
V
ST
V
DET
1
V
REL
1
tV
REL
1
V
DET
2
tV
DET
2
tV
REL
2
V
DET
3
tV
REL
3
V
SHORT
t
SHORT
R
SHORT
V
IH
R
DS
V
OL
1
V
OH
1
V
OL
2
V
DD
2
I
DD
I
S
V
CHG
1
V
CHG
2
Over-charge detection delay time
tV
DET
1
Detect falling edge of supply voltage
0.140 0.150 0.160
Over-discharge curent detection delay time
tV
DET
3
V
DD
–1.2 V
DD
–0.9 V
DD
–0.6
*1 The parameter is guaranteed by desing.
*2 The test circuit symbols on next page.
MITSUMI
Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077
Test circuit
A
2
V
DD
V
H
D
OUT
1
C
OUT
5
OSCILLOSCOPE
2
V
DD
6
V–
D
OUT
1
C
OUT
5
DS
4
A
OSCILLOSCOPE
6
V–
V
3
V
SS
3
V
SS
DS
4
V
B
2
V
DD
6
V–
V
I
D
OUT
1
C
OUT
5
DS
4
OSCILLOSCOPE
2
V
DD
6
V–
3
V
SS
D
OUT
1
C
OUT
5
DS
4
A
V
3
V
SS
C
2
V
DD
6
V–
3
V
SS
D
OUT
1
C
OUT
5
DS
4
OSCILLOSCOPE
J
2
V
DD
6
V–
3
V
SS
D
OUT
1
C
OUT
5
DS
4
A
V
D
2
V
DD
6
V–
V
K
D
OUT
1
C
OUT
5
DS
4
OSCILLOSCOPE
2
V
DD
6
V–
3
V
SS
D
OUT
1
C
OUT
5
DS
4
A
V
3
V
SS
E
2
V
DD
6
V–
3
V
SS
D
OUT
1
C
OUT
5
DS
4
OSCILLOSCOPE
L
2
V
DD
6
V–
3
V
SS
D
OUT
1
C
OUT
5
DS
4
A
V
F
2
V
DD
A
V
D
OUT
1
C
OUT
5
DS
4
OSCILLOSCOPE
M
2
V
DD
A
D
OUT
1
C
OUT
5
DS
4
6
V–
3
V
SS
6
V–
3
V
SS
G
2
V
DD
6
V–
V
D
OUT
1
C
OUT
5
DS
4
OSCILLOSCOPE
3
V
SS
MITSUMI
Protection of Lithium Ion/Lithium Polymer Battery(one cell) MM3077
Description
1. Over charge detection circuit (VD1)
This IC monitor V
DD
pin voltage, when the voltage of V
DD
pin cross overcharge detection voltage (4.30V typ.)
from a low value higher than the overcharge detection voltage, the IC sense a overcharging and external
charging control Nch MOS FET turns to OFF with C
OUT
pin being low level.
After detecting overcharge when the V
DD
pin voltage is coming down to a level lower than overcharge release
voltage (4.10V typ.) external charging control Nch MOS FET turns to ON with C
OUT
pin being high level.
After detecting overcharge in the V
DD
pin voltage, connecting system load to the battery charger makes load
current allowable supplied to parasitic diode of charging control FET. The C
OUT
pin level would be high when
the V
DD
pin level is coming down to a level below the overcharge detection voltage by continuous sending a
load current.
There are delay time set in IC when the overcharge and the overcharge release are detected. When the V
DD
level is going up to a higher level than overcharge detection voltage if the V
DD
voltage would be back to a level
lower than the overcharge detection voltage within a time period of the over charge release delay time (1.0s
typ.). The overcharge detection does not release when returning to former state in the overcharge release
dead time (8ms typ.) even if the load is connected after the charger is removed when the V
DD
pin voltage is
lower than the overcharge release voltage with the overcharge detected.
A level shifter incorporated in a buffer drive for the C
OUT
to the V-pin voltage and the high level of C
OUT
is set to
V
DD
voltage with CMOS buffer.
2. Over discharge detection circuit (VD2)
This IC monitors V
DD
pin voltage, and when the voltage crosses the overdischarge detection voltage (2.30V
typ.) from high value to a value lower than the overdischarge detection voltage, this IC sense an
overdischarge and an external discharging control Nch MOS FET turns to OFF with D
OUT
pin being at low
level.
The release from the overdischarge is done only by connecting the charger. Charging current is supplied
through a parasitic diode of Nch MOS FET when the V
DD
pin voltage is below the overdischarge detection
voltage to the connection of the charger, and the D
OUT
pin enters the state which can be discharged by
becoming high level,and turning on Nch MOS FET when the V
DD
pin voltage rises more than the
overdischarge detection voltage.
The C
OUT
pin becomes high level and charging current is supplied if the voltage of the charger is more than
the maximum value of 0V charging lowest operating voltage when the voltage of the battery is 0V.
An output delay time for the overdischarge detection is fixed internally (8ms typ.). When V
DD
pin voltage
becomes lower the over discharge detection voltage if V
DD
pin higher more than the over discharge detection
voltage in delay time even does not enter the over discharge detection mode.
Moreover, when the over discharge release,delay time is set (4ms typ.).
All the circuits are stopped, and after the overdischarge is detected, it is assumed the state of the standby,
and decreases the current (standby current) which IC consumes as much as possible (The V
DD
=2V 0.1µA
max.).
The output type of D
OUT
pin is CMOS having high level of V
DD
and low level of V
SS
.
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