Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UB227
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CMOS IC
1-CELL LITHIUM-ION/POLYMER
BATTERY PROTECTION IC
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DESCRIPTION
The UTC UB227 is a series of lithium-ion/lithium-polymer
rechargeable battery protection ICs incorporating high accuracy
voltage detection circuits and delay circuits.
The UTC UB227 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 UB227 into the limited space of
battery pack.
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SOT-26
FEATURES
Wide Supply Voltage Range: VDD=1.5V~8.0V
Ultra-Low Quiescent Current: IOPE=3.0μA (VDD=3.9V)
Ultra-Low Power-Down Current: IPDN=0.1μA (VDD=2.0V)
Overcharge Detection Voltage: VCU=3.9V~4.4V
Overcharge Release Voltage: VCL=3.8V~4.4V
Over Discharge Release Voltage: VDL=2.0V~3.0V
Over Discharge Release Voltage: VDU=2.0V~3.4V
Discharge Over Current Detection Voltage: VDIOV=0.05V~0.30V
Discharge Short Circuit Detection Voltage: VSHORT=0.85V (Fixed)
Charge Over Current Voltage: VCIOV=-0.115V (Fixed)
Charger Detection Voltage: VCHA=-0.7V (Fixed)
Delay Times are Generated by an Internal Circuit. (External Capacitors are Unnecessary.)
ORDERING INFORMATION
Note:
Ordering Number
UB227G-xx-AG6-R
xx: Output Voltage, refer to Marking Information.
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Copyright © 2015 Unisonic Technologies Co., Ltd
Package
SOT-26
Packing
Tape Reel
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CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE
SOT-26
XX
MARKING
Note: XX : Refer to Serial Code List.

SERIAL CODE LIST
Model
Code
UB227
AA
AB
AC
AD
AE
AF
AG
AH
AI
Overcharge
Detection
Voltage
[VCU](V)
4.325
4.325
4.300
4.280
4.280
4.275
4.250
4.200
4.100
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PIN CONFIGURATION
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PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
PIN NAME
DO
VM
CO
NC
VDD
VSS
Overcharge
Release
Voltage
[VCL](V)
4.075
4.075
4.200
4.180
4.080
4.075
4.150
4.100
3.850
Over discharge
Detection
Voltage
[VDL](V)
2.50
2.50
2.40
2.50
2.30
2.50
2.40
2.80
2.50
Over discharge
Release
Voltage
[VDU](V)
2.90
2.90
3.00
3.00
2.40
2.90
3.00
2.90
2.90
Over Current
Detection
Voltage
[VDIOV](V)
0.150
0.100
0.200
0.150
0.100
0.150
0.100
0.150
0.150
DESCRIPTION
For discharge control: FET gate connection pin
For current sense and charger detection input pin
For charge control: FET gate connection pin
No connection
Positive power input
Negative power input
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CMOS IC
BLOCK DIAGRAM
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CMOS IC
ABSOLUTE MAXIMUM RATING (VSS=0V, TA=25°С unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage Between VDD and VSS (Note 2)
VDD
VSS-0.3~VSS+12
V
CO Output Pin Voltage
VCO
VDD-20~VDD+0.3
V
DO Output Pin Voltage
VDO
VSS-0.3~VDD+0.3
V
VM Input Pin Voltage
VM
VDD-20~VDD+0.3
V
Ambient Operating Temperature
TOPR
-40~+85
°С
Storage Temperature
TSTG
-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 (VSS+12V) may cause damage to the IC.
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ELECTRICAL CHARACTERISTICS (VSS=0V, TA=25°С unless otherwise specified)
PARAMETER
SYMBOL
TEST CONDITIONS
CURRENT CONSUMPTION
Supply Current
IOPE VDD=3.9V, VM=0V
Power-Down Current
IPDN VDD=VM=2.0V
OPERATING VOLTAGE
Operating Voltage Between VDD-pin
VDS1
and VSS-pin
Operating Voltage Between VDD-pin
VDS2
and VM-pin
DETECTION VOLTAGE
Overcharge Detection Voltage
VCU
Overcharge Release Voltage
VCL
Overdischarge Detection Voltage
VDL
Overdischarge Release Voltage
VDU
Discharge Over Current Detection
VDIOV VDD=3.6V
Voltage
Discharge Short Circuit Detection
VSHORT VDD=3.0V
Voltage
Charge Over Current Detection Voltage VCIOV
Charger Detection Voltage
VCHA VDU≠VDL
0V BATTERY CHARGE VOLTAGE
0V Battery Charge Starting Charger
V0CHA
Voltage
CONTROL OUTPUT VOLTAGE(DO&CO)
CO Pin Output “H” Voltage
VCOH
CO Pin Output “L” Voltage
VCOL
DO Pin Output “H” Voltage
VDOH
DO Pin Output “L” Voltage
VDOL
DELAY TIME
Overcharge Detection Delay Time
tCU
Overdischarge Detection Delay Time
tDL
Discharge Over Current Detection
tDIOV VDD=3.6V
Delay Time
Discharge Short Circuit Detection Delay
tSHORT VDD=3.0V
Time
Charge Over Current Detection Delay
tCIOV
Time
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MIN
TYP
MAX
UNIT
3.0
6.0
0.1
μA
μA
1.5
8
V
1.5
20
V
VCU+0.050
VCL+0.050
VDL+0.100
VDU+0.100
V
V
V
V
VDIOV-0.03 VDIOV VDIOV+0.03
V
VCU-0.050
VCL-0.050
VDL-0.100
VDU-0.100
VCU
VCL
VDL
VDU
0.50
0.85
1.20
V
-0.145
-1.6
-0.115
-0.7
-0.085
-0.2
V
V
1.2
V
VDD-0.1 VDD-0.02
0.1
VDD-0.1 VDD-0.02
0.1
0.5
0.5
V
V
V
V
1.0
125
s
ms
12
ms
500
µs
16
ms
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CMOS IC
OPERATION
1. Normal Condition
The UTC UB227 series monitors the voltage of the battery connected between VDD pin and VSS pin and the
voltage difference between VM pin and VSS pin to control charging and discharging. When the battery voltage is in
the range from the overdischarge detection voltage (VDL) to the overcharge detection voltage (VCU), and the VM pin
voltage is in the range from the charge overcurrent detection voltage (VCIOV) to discharge overcurrent detection
voltage (VDIOV), 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 VM pin and VSS pin or connect the charger to restore the normal condition.
2. Overcharge Condition
When the battery voltage becomes higher than the overcharge detection voltage (VCU) during charging under the
normal condition and the detection continues for the overcharge detection delay time (tCU), the UTC UB227 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 VM pin voltage is higher than or equal to the charge overcurrent detection voltage (VCIOV), and is
lower than the discharge overcurrent detection voltage (VDIOV), the UTC UB227 Series releases the overcharge
status when the battery voltage falls below the overcharge release voltage (VCL).
(2) When the VM pin voltage is higher than or equal to the discharge overcurrent detection voltage (VDIOV), the UTC
UB227 Series releases the overcharge condition when the battery voltage falls below the overcharge detection
voltage (VCU).
Note 1: If the battery is charged to a voltage higher than overcharge detection voltage (VCU) and the battery
voltage does not fall below overcharge detection voltage (VCU) even when a heavy load is connected, discharge
overcurrent detection and load short-circuiting detection do not function until the battery voltage falls below
overcharge detection voltage (VCU). Since an actual battery has an internal impedance of tens of mΩ, the battery
voltage drops immediately after a heavy load that causes overcurrent is connected, and discharge overcurrent
detection and load short-circuiting detection function.
Note 2: When a charger is connected after overcharge detection, the overcharge status is not released even if the
battery voltage is below overcharge release voltage (VCL). The overcharge status is released when the VM pin
voltage goes over the charge overcurrent detection voltage (VCIOV) by removing the charger.
3. Overdischarge Condition
When the battery voltage falls below the overdischarge detection voltage (VDL) during discharging under the
normal condition and the detection continues for the overdischarge detection delay time (tDL), the UTC UB227 series
turns the discharging control FET off to stop discharging. This condition is called the overdischarge condition. When
the discharging control FET is turned off, the VM pin voltage is pulled up by the resistor between VM and VDD in the IC
(RVMD). When the voltage difference between the VM and VDD then is 1.2V (typ.) or lower, the current consumption is
reduced to the power-down current consumption (IPDN). This condition is called the power-down condition.
The power-down condition is released when a charger is connected and the voltage difference between the VM
and VDD becomes 1.2V (typ.) or higher. Moreover when the battery voltage becomes the overdischarge detection
voltage (VDL) or higher, the UTC UB227 series turns the discharging FET on and returns to the normal condition.
4. Discharge Overcurrent Condition
Under normal condition, the UTC UB227 continuously monitors the discharge current by sensing the voltage of VM
pin.
If the voltage of VM pin exceeds the overcurrent detection voltage (VDIOV) and the condition lasts beyond the
overcurrent delay time (tDIOV), discharging will be suspended by turning off the discharge control MOSFET (DO pin).
This condition is called the discharge overcurrent status.
If the voltage of VM pin exceeds the short circuit detection voltage (VSHORT) and the condition lasts beyond the
short circuit delay time (tSHORT), discharging will be suspended by turning off the discharge control MOSFET (DO pin).
This condition is called the short circuit status.
When the impedance between EB+ and EB- is larger than ”automatic restoration impedance” and the voltage at
the VM pin is lower than overcurrent detection voltage (VDIOV), the discharge overcurrent condition will be released.
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CMOS IC
OPERATION (Cont.)
5. Charger Detection
When the charger is connected to the overdischarge battery, if the voltage of VM pin is lower than charger
detection voltage (VCHA), based on the charger detection function, as long as the battery voltage is higher than
overdischarge voltage(VDL), the discharge status will be released and discharging control MOSFET (DO pin) will be
turned on. This process is called the “charger detection status”.
Conversely, if VM pin’s voltage is not lower than charger detection voltage (VCHA), the battery voltage has to reach
the overdischarge release voltage (VDU) to relieve the overdischarge status as usual.
6. Charge Overcurrent Condition
When a battery in the normal status is in the status where the voltage of the VM pin is lower than the charge
overcurrent detection voltage (VCIOV) because the charge current is higher than the specified value and the status
lasts for the charge overcurrent detection delay time (tCIOV), the charge control FET is turned off and charging is
stopped. This status is called the charge overcurrent status.
This IC will be restored to the normal status from the charge overcurrent status when, the voltage at the VM pin
returns to charge overcurrent detection voltage (VCIOV) or higher by removing the charger.
The charge overcurrent detection function does not work in the overdischarge status.
7. Delay Circuits
The discharge overcurrent detection delay time (tDIOV) and the load short-circuiting detection delay time (tSHORT)
start when the discharge overcurrent detection voltage (VDIOV) is detected. When the load short-circuiting detection
voltage (VSHORT) is detected over the load short-circuiting detection delay time (tSHORT) after the detection of
discharge overcurrent detection voltage (VDIOV), the UTC UB227 turns the discharging control FET off within tSHORT
from the time of detecting VSHORT.
When any overcurrent is detected and the overcurrent continues for longer than the overdischarge detection delay
time (tDL) without the load being released, the status changes to the power-down status at the point where the
battery voltage falls below overdischarge detection voltage (VDL).
When the battery voltage falls below overdischarge detection voltage (VDL) due to overcurrent, the UTC UB227
Series turns the discharging control FET off via overcurrent detection. In this case, if the recovery of the battery
voltage is so slow that the battery voltage after the overdischarge detection delay time is still lower than the
overdischarge detection voltage, the UTC UB227 Series shifts to the power-down status.
8. 0V Battery Charging Function “Unavailable”
This function is used to recharge a connected battery which voltage is 0V due to self-discharge. When the 0V
battery charge starting charger voltage (V0CHA) or a higher voltage is applied between EB+ and EB- pins by
connecting a charger, the charging control MOSFET gate is fixed to the VDD pin voltage.
When the voltage between the gate and the source of the charging control MOSFET becomes equal to or higher
than the turn on voltage due to the charger voltage, the charging control MOSFET is turned on to initiate charging. At
this time, the discharging control MOSFET is off and the charging current flows through the internal parasitic diode in
the discharging control MOSFET. When the battery voltage becomes equal to or higher than overdischarge voltage
(VDL), the UTC UB227 series will enter into the normal status.
Note 1: Some battery providers do not recommend charging for a completely self-discharged battery. Please ask
the battery provider to determine whether to enable or prohibit the 0V battery charging function.
Note 2: The 0V battery charge function has higher priority than the charger current detection function.
Consequently, a product in which use of the 0V battery charging function is enabled charges a battery forcibly and
the charge overcurrent cannot be detected when the battery voltage is lower than overdischarge detection voltage
(VDL).
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CMOS IC
TIMING CHART
(1) Overcharge Detection, Overdischarge Detection
Charger
Load
VCU
VCL
VDU
VDL
VDD
VSS
VDD
VSS
VDD
VSHORT
VDIOV
VSS
VCIOV
VCHA
tCU
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tDL
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CMOS IC
TIMING CHART (Cont.)
(2) Discharge Overcurrent Detection
Charger
CO Pin
Battery Voltage
Load
VCU
VCL
VDU
VDL
VDD
DO Pin
VSS
VDD
VM Pin
VSS
VDD
VSHORT
VDIOV
VSS
VCIOV
VCHA
tDIOV
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tSHORT
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CMOS IC
TIMING CHART (Cont.)
(3) Charge Overcurrent Detection
Charger
Load
VCU
VCL
VDU
VDL
VDD
VSS
VDD
VSS
VDD
VSHORT
VDIOV
VSS
VCIOV
VCHA
tDL
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tCIOV
tDL
tCIVO
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CMOS IC
TYPICAL APPLICATION CIRCUIT
EB+
R1=100~470Ω
NC
VDD
Battery
UTC UB227
C1=0.1µF
VM
VSS
DO
CO
R2=1kΩ
M1
M2
EB-
Notes: 1. Overdischarge detection voltage must be higher than the threshold voltage of M1 and M2, if not, the M1
may not cut the charging current. If the threshold voltage of M1 equal to or higher than the overdischarge
detection voltage is used, discharging may be stopped before overdischarge is detected.
2. Charger voltage must be higher than the withstanding voltage between the gate and source of M1 and M2,
if not, M1 and M2 may be destroyed.
3. Resistance of R1 can’t be high, the value is about from 100Ω to 470Ω, If R1 has a high resistance, the
voltage between VDD pin and VSS pin may exceed the absolute maximum rating when a charger is
connected in reverse since the current flows from the charger to the IC. Insert a resistor of 100Ω or higher
as R1 for ESD protection.
4. The capacitance of C1 must not be less than 0.022μF, if not, DO pin may oscillate when load
short-circuiting is detected. Be sure to connect a capacitor of 0.022μF or higher to C1, the typical value is
about 0.1μF.
5. The resistance of R2 can not be higher than 2kΩ, if not, the charging current may not be cut when a
high-voltage charger is connected.
UTC assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or
other parameters) listed in products specifications of any and all UTC products described or contained
herein. UTC products are not designed for use in life support appliances, devices or systems where
malfunction of these products can be reasonably expected to result in personal injury. Reproduction in
whole or in part is prohibited without the prior written consent of the copyright owner. The information
presented in this document does not form part of any quotation or contract, is believed to be accurate
and reliable and may be changed without notice.
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