UNISONIC TECHNOLOGIES CO., LTD
UB261
Preliminary
CMOS IC
1-CELL LITHIUM-ION/POLYMER
BATTERY PROTECTION IC
DESCRIPTION
6
5
4
The UTC
UB261
is a series of lithium-ion/lithium-polymer
rechargeable battery protection ICs incorporating high accuracy
voltage detection circuits and delay circuits.
The UTC
UB261
is suitable for protection of single cell lithium-ion /
lithium polymer battery packs from overcharge, over discharge and
over current.
The ultra-small package and less required external components
make it ideal to integrate the UTC
UB261
into the limited space of
battery pack.
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SOT-26
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FEATURES
Wide Supply Voltage Range: V
DD
=1.5V~8.0V
Ultra-Low Quiescent Current: I
OPE
=3.0μA (V
DD
=3.5V)
Ultra-Low Power-Down Current: I
PDN
=0.2μA (V
DD
=1.5V)
Overcharge Detection Voltage: V
CU
=3.9V~4.4V
Overcharge Release Voltage: V
CL
=3.8V~4.4V
Over Discharge Release Voltage: V
DL
=2.0V~3.0V
Over Discharge Release Voltage: V
DU
=2.0V~3.4V
Over Current 1 Detection Voltage: V
IOV1
=0.05V~0.30V
Over Current 2 Detection Voltage: V
IOV2
=0.5V (Fixed)
Short Circuit Detection Voltage: V
SHORT
=1.2V (Fixed)
Charger Detection Voltage: V
CHA
=-0.7V (Fixed)
Delay Times are Generated by an Internal Circuit. (External Capacitors are Unnecessary.)
ORDERING INFORMATION
Ordering Number
UB261G-xx-AG6-R
xx: Output Voltage, refer to Marking Information.
Package
SOT-26
Packing
Tape Reel
Note:
www.unisonic.com.tw
Copyright © 2014 Unisonic Technologies Co., Ltd
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QW-R502-A27.b
UB261
Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING
(V
SS
=0V, T
A
=25°С unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage Between V
DD
and V
SS
(Note 2)
V
DD
V
SS
-0.3 ~ V
SS
+12
V
CO Output Pin Voltage
V
CO
V
DD
-12 ~ V
DD
+0.3
V
DO Output Pin Voltage
V
DO
V
SS
-0.3 ~ V
DD
+0.3
V
V
M
Input Pin Voltage
V
M
V
DD
-14 ~ V
DD
+0.3
V
Ambient Operating Temperature
T
OPR
-40 ~ +85
°С
Storage Temperature
T
STG
-55 ~ +125
°С
Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
2. Pulse (μsec) noise exceeding the above input voltage (V
SS
+12V) may cause damage to the IC.
ELECTRICAL CHARACTERISTICS
(V
SS
=0V, T
A
=25°С unless otherwise specified)
MIN
TYP
3.0
0.2
1.5
1.5
V
CU
-0.050 V
CU
V
CL
-0.050 V
CL
V
DL
-0.100 V
DL
V
DU
-0.100 V
DU
V
IOV1
-0.03 V
IOV1
0.35
0.50
0.5
1.2
-1.6
-0.7
0.9
MAX
8.0
0.5
8
10
V
CU
+0.050
V
CL
+0.050
V
DL
+0.100
V
DU
+0.100
V
IOV1
+0.03
0.65
1.7
-0.2
1.8
UNIT
μA
μA
V
V
V
V
V
V
V
V
V
V
V
PARAMETER
SYMBOL
TEST CONDITIONS
CURRENT CONSUMPTION
Supply Current
I
OPE
V
DD
=3.5V, V
M
=0V
Power-Down Current
I
PDN
V
DD
=V
M
=1.5V
OPERATING VOLTAGE
Operating Voltage Between V
DD
-pin and
V
DS1
V
SS
-pin
Operating Voltage Between V
DD
-pin and
V
DS2
V
M
-pin
DETECTION VOLTAGE
Overcharge Detection Voltage
V
CU
Overcharge Release Voltage
V
CL
Overdischarge Detection Voltage
V
DL
Overdischarge Release Voltage
V
DU
Over Current 1 Detection Voltage
V
IOV1
V
DD
=3.5V
Over Current 2 Detection Voltage
V
IOV2
V
DD
=3.5V
Load Short Circuit Detection Voltage
V
SHORT
Charger Detection Voltage
V
CHA
V
DU
≠V
DL
0V BATTERY CHARGE VOLTAGE
0V Battery Charge Inhibition Battery
V
0INH
Voltage
INTERNAL RESISTANCE
Resistance between VM-pin and
R
VMD
V
DD
=1.8V, V
M
=0V
V
DD
-pin
Resistance between VM-pin and
R
VMS
V
DD
=3.5V, V
M
=1.0V
V
SS
-pin
OUTPUT RESISTANCE
CO-pin Resistance “H”
R
COH
V
CO
=3.0V, V
DD
=3.5V, V
M
=0V
CO-pin Resistance “L”
R
COL
V
CO
=0.5V, V
DD
=4.5V, V
M
=0V
DO-pin Resistance “H”
R
DOH
V
DO
=3.0V, V
DD
=3.5V, V
M
=0V
DO-pin Resistance “L”
R
DOL
V
DO
=0.5V, V
DD
=V
M
=1.8V
DELAY TIME
Overcharge Detection Delay Time
t
CU
Overdischarge Detection Delay Time
t
DL
Over Current 1 Detection Delay Time
t
IOV1
V
DD
=3.5V
Over Current 2 Detection Delay Time
t
IOV2
V
DD
=3.5V
Short Circuit Detection Delay Time
t
SHORT
100
10
300
30
5
5
5
5
900
70
10
10
10
10
1.5
190
12
3.2
380
kΩ
kΩ
kΩ
kΩ
kΩ
kΩ
s
ms
ms
ms
µs
0.9
110
6
1
120
1.2
150
9
2.2
300
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
4 of 10
QW-R502-A27.b
UB261
OPERATION
Preliminary
CMOS IC
1. Normal Condition
The
UTC UB261
series monitors the voltage of the battery connected between V
DD
pin and V
SS
pin and the
voltage difference between V
M
pin and V
SS
pin to control charging and discharging. When the battery voltage is in
the range from the overdischarge detection voltage (V
DL
) to the overcharge detection voltage (V
CU
), and the V
M
pin
voltage is in the range from the charger detection voltage (V
CHA
) to the overcurrent 1 detection voltage (V
IOV1
), the IC
turns both the charging and discharging control FETs on. This condition is called the normal condition, and in this
condition charging and discharging can be carried out freely.
Note: When a battery is connected to the IC for the first time, discharging may not be enabled. In this case, short
the V
M
pin and V
SS
pin or connect the charger to restore the normal condition.
2. Overcurrent Condition
When a battery in the normal status is in the status where the voltage of the V
M
pin is equal to or higher than the
overcurrent detection voltage because the discharge current is higher than the specified value and the status lasts
for the overcurrent detection delay time, the discharge control FET is turned off and discharging is stopped. This
status is called the overcurrent status. In the overcurrent status, the V
M
and V
SS
pins are shorted by the resistor
between V
M
and V
SS
(R
VMS
) in the IC. However, the voltage of the V
M
pin is at the V
DD
potential due to the load as
long as the load is connected. When the load is disconnected, the V
M
pin returns to the V
SS
potential. This IC detects
the status when the impedance between the EB+ pin and EB- pin (Refer to the typical application circuit) increases
and is equal to the impedance that enables automatic restoration and the voltage at the V
M
pin returns to overcurrent
detection voltage 1 (V
IOV1
) or lower and the overcurrent status is restored to the normal status.
Note: The impedance that enables automatic restoration varies depending on the battery voltage and the set value
of overcurrent 1 detection voltage.
3. Overcharge Condition
When the battery voltage becomes higher than the overcharge detection voltage (V
CU
) during charging under the
normal condition and the detection continues for the overcharge detection delay time (t
CU
), the
UTC UB261
series
turns the charging control FET off to stop charging. This condition is called the overcharge condition. The overcharge
condition is released by the following two cases:
(1) When the battery voltage falls below the overcharge release voltage (V
CL
), the
UTC UB261
series turns the
charging control FET on and turns to the normal condition.
(2) When a load is connected and discharging starts, the
UTC UB261
series turns the charging control FET on
and returns to the normal condition. Just after the load is connected and discharging starts, the discharging current
flows through the parasitic diode in the charging control FET. At this moment the V
M
pin potential becomes Vf, the
voltage for the parasitic diode, higher than V
SS
level. When the battery voltage goes under the overcharge detection
voltage (V
CU
) and provided that the V
M
pin voltage is higher than the overcurrent 1 detection voltage, the
UTC
UB261
series releases the overcharge condition.
Note 1: If the battery is charged to a voltage higher than the overcharge detection voltage (V
CU
) and the battery
voltage does not fall below the overcharge detection voltage (V
CU
) even when a heavy load is connected, the
detection of overcurrent 1, overcurrent 2 and load shortcircuiting do not function until the battery voltage falls below
over charge detection voltage (V
CU
). Since an actual battery has an internal impedance of several dozens of mΩ, the
battery voltage drops immediately after a heavy load that causes overcurrent is connected, and the detection of
overcurrent 1, overcurrent 2 and load short-circuiting function.
Note 2: When a charger is connected after the overcharge detection, the overcharge condition is not released
even if the battery voltage is below the overcharge release voltage (V
CL
). The overcharge condition is released when
the V
M
pin voltage goes over the charger detection voltage (V
CHA
) by removing the charger.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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QW-R502-A27.b
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