Datasheet

UNISONIC TECHNOLOGIES CO., LTD
UB291
Preliminary
CMOS IC
1-CELL LITHIUM-ION/POLYMER
BATTERY PROTECTION IC

DESCRIPTION
The UTC UB291 is a series of lithium-ion/lithium-polymer
rechargeable battery protection ICs incorporating high accuracy
voltage detection circuits and delay circuits.
The UTC UB291 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 UB291 into the limited space of
battery pack.

6
5
4
1
2
3
SOT-26
FEATURES
* Wide Supply Voltage Range: VDD=1.5V~10V
* Ultra-Low Quiescent Current: IOPE=3.0μA (VDD=3.9V)
* Ultra-Low Power-Down Current: IPDN=0.2μA (VDD=2.0V)
* Overcharge Detection Voltage: VDET1=4.05V~4.35V
* Overcharge Release Voltage: VREL1=3.8V~4.25V
* Over Discharge Detection Voltage: VDET2=2.2V~3.1V
* Over Discharge Release Voltage: VREL2=2.3V~3.3V
* Discharge Over Current Detection Voltage: VDET3=0.07V~0.23V
* Discharge Short Circuit Detection Voltage: VSHORT=0.5V
* Charge Over Current Voltage: VDET4=-0.1V
* Charger Detection Voltage: VCHA=-0.7V
* Delay Times are Generated by an Internal Circuit. (External Capacitors are Unnecessary.)

ORDERING INFORMATION
Note:
Ordering Number
UB291G-xx-AG6-R
xx: Output Voltage, refer to Marking Information.
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Package
SOT-26
Packing
Tape Reel
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UB291
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Preliminary
CMOS IC
MARKING INFORMATION
PACKAGE
VOLTAGE CODE (Note)
SOT-26
XX
MARKING
Note: Refer to Serial Code List

SERIAL CODE LIST
Model
Code
UB291
AA
AB
AC
AD
AE
AF
AG
AH
AI
AJ
Overcharge
Detection
Voltage
[VDET1](V)
4.275
4.280
4.300
4.280
4.280
4.275
4.250
4.200
4.100
4.280

PIN CONFIGURATION

PIN DESCRIPTION
PIN NO.
1
2
3
4
5
6
PIN NAME
DO
CO
DS
VM
VDD
VSS
Overcharge
Release
Voltage
[VREL1](V)
4.175
4.100
4.200
4.180
4.080
4.075
4.150
4.100
3.850
4.150
Over discharge
Detection
Voltage
[VDET2](V)
3.00
2.30
2.40
2.50
2.30
2.50
2.40
2.80
2.50
2.80
Over discharge
Release
Voltage
[VREL2](V)
3.20
2.50
3.00
3.00
2.40
2.90
3.00
2.90
2.90
3.10
Over Current
Detection
Voltage
[VDET3](V)
0.150
0.150
0.200
0.150
0.100
0.150
0.100
0.150
0.150
0.150
DESCRIPTION
For discharge control: FET gate connection pin
For charge control: FET gate connection pin
For reduce delay time: test pin
For current sense and charger detection input pin
Positive power input
Negative power input
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UB291

Preliminary
CMOS IC
BLOCK DIAGRAM
0V Battery Charge
Inhibition Detector
VDD
VM
Oscillator
Discharge
Short circuit Detector
Charger Detector
Divider
Discharge
Over current Detector
Overdischarge
Detector
Control
Logic
VM
Overcharge
Detector
Charge
Over current Detector
To Oscillator
VSS
DS
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CO
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Preliminary
CMOS IC
ABSOLUTE MAXIMUM RATING (VSS=0V, TA=25°С unless otherwise specified)
PARAMETER
SYMBOL
RATINGS
UNIT
Input Voltage Between VDD and VSS (Note 1)
VDD
VSS-0.3 ~ VSS+12
V
CO Output Pin Voltage
VCO
VDD-28 ~ VDD+0.3
V
DO Output Pin Voltage
VDO
VSS-0.3 ~ VDD+0.3
V
VM Input Pin Voltage
VM
VDD-28 ~ VDD+0.3
V
DS Input Pin Voltage
VDS
VSS-0.3 ~ 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.

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 and
VDS1
VSS-pin
Operating Voltage Between VDD-pin and
VDS2
VM-pin
DETECTION VOLTAGE
Overcharge Detection Voltage
VDET1
Overcharge Release Voltage
VREL1
Overdischarge Detection Voltage
VDET2
Overdischarge Release Voltage
VREL2
VDET3 VDD=3.0V
Discharge Over Current Detection Voltage
VSHORT VDD=3.0V
Discharge Short Circuit Detection Voltage
Charge Over Current Detection Voltage VDET4 VDD=3.0V
Charger Detection Voltage
VCHA VREL2≠VDET2
0V BATTERY CHARGE VOLTAGE
0V Battery Charge Inhibition Battery
V0INH
Voltage
CONTROL OUTPUT VOLTAGE(CO&DO)
CO Pin Output “H” Voltage
VCOH VDD=3.9V, ICO=-30µA
CO Pin Output “L” Voltage
VCOL VDD=4.5V, ICO=30µA
DO Pin Output “H” Voltage
VDOH VDD=3.9V, IDO=-30µA
DO Pin Output “L” Voltage
VDOL VDD=2.0V, IDO=30µA
DELAY TIME
Overcharge Detection Delay Time
tDET1 VDD=3.6V to 4.6V
Overcharge Release Delay Time
tREL1 VDD=4.6V to 3.6V
Overdischarge Detection Delay Time
tDET2 VDD=3.6V to 2.0V
Overdischarge Release Delay Time
tREL2 VDD=2.0V to 3.6V
Discharge Over Current Detection Delay
Time
Discharge Over Current Release Delay Time
Charge Over Current Detection Delay Time
Charge Over Current Release Delay Time
Discharge Short Circuit Detection Delay
Time
TYP
MAX
UNIT
3.0
0.2
8.0
0.5
μA
μA
1.5
12
V
1.5
26
V
VDET1
VREL1
VDET2
VREL2
VDET3
0.50
-0.100
-0.7
VDET1+0.05
VREL1+0.05
VDET2+0.10
VREL2+0.10
VDET3+0.03
0.65
-0.080
-0.2
V
V
V
V
V
V
V
V
0.9
1.8
V
VDET1-0.05
VREL1-0.05
VDET2-0.10
VREL2-0.10
VDET3-0.03
0.35
-0.120
-1.6
3.4
3.4
3.7
0.4
3.7
0.2
0.5
0.5
V
V
V
V
1.00
16
125
1.0
s
ms
ms
ms
tDET3
VDD=3.0V, VM=0V to 0.3V
8.0
ms
tREL3
tDET4
tREL4
VDD=3.0V, VM=0.3V to 0V
VDD=3.0V, VM=0V to -1V
VDD=3.0V, VM=-1V to 0V
1.0
8.0
1.0
ms
ms
ms
500
µs
tSHORT VDD=3.0V, VM=0V to 3V
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Preliminary
CMOS IC
OPERATION
1. Over charge detector
In the state of charging the battery, it will detect the overcharge state of the battery if the VDD terminal voltage
becomes higher than the overcharge detection voltage (VDET1). And then the CO terminal turns to low level, so the
external charging control Nch MOSFET turns OFF and it forbids to charge the battery.
After detecting overcharge, it will release the overcharge state if the VDD terminal voltage becomes lower than the
overcharge release voltage (VREL1). And then the CO terminal turns to high level, so the external charging control
Nch MOS FET turns ON, and it accepts to charge the battery.
When the VDD terminal voltage is higher than the overcharge detection voltage, to disconnect the charger and
connect the load, leave the CO terminal low level, but it accepts to conduct load current via the paracitical body
diode of the external Nch MOSFET. And then if the VDD terminal voltage becomes lower than the overcharge
detection voltage, the CO terminal turns to high level, so the external Nch MOSFET turn ON, and it accepts to
charge the battery.
The overcharge detection and release have delay time decided internally. When the VDD terminal voltage becomes
higher than the overcharge detection voltage, it will not detect overcharge, if the VDD terminal voltage becomes lower
than the overcharge detection voltage again within the overcharge detection delay time (Typ.1.00s). And in the state
of overcharge, when the VDD terminal voltage becomes lower than the overcharge release voltage, it will not release
overcharge, if the VDD terminal voltage backs higher than the overcharge release voltage again within the overcharge
release delay time (Typ.16ms).
The output driver stage of the CO terminal includes a level shifter, so it will output the VM terminal voltage as low
level. The output type of the CO terminal is CMOS output between VDD and VM terminal voltage.
2. Over discharge detector
In the state of discharging the battery, it will detect the overdischarge state of the battery If the VDD terminal
becomes lower than the overdischarge detection voltage (VDET2). And then the DO terminal turns to low level, so the
external discharging control Nch MOSFET turn OFF and it forbids to discharge the battery.
The release from the overdischarge state is done by the overdischarge release voltage (VREL2) or connecting the
charger. If the charger is connected and the VDD terminal voltage is lower than the overdischarge detection voltage, it
accepts to conduct charge current via the paracitical body diode of the external Nch MOSFET. And then if the VDD
terminal voltage becomes higher than the overdischarge detection voltage, the DO terminal turns to high level, so
the external Nch MOSFET turns ON, and it accepts to discharge the battery. If the charger is connected and the VDD
terminal voltage is higher than the overdiscahrge detection voltage, the DO terminal will turn to high level with the
delay time.
Charging current cannot be supplied to the battery that is discharged to lower than the maximum forbidden voltage
for 0V charging .
The overdischarge detection have delay time decided internally. When the VDD terminal voltage becomes lower
than the overdischarge detection voltage, it will not detect overdischarge, if the VDD terminal voltage becomes higher
than the overdischarge detection voltage again within the overdischarge detection delay time (Typ.125ms). Moreover,
the overdischarge release delay time (Typ.1ms) exists, too.
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 (When VDD=2V, Max.0.5uA).
The output type of the DO terminal is CMOS output between VDD and VSS terminal voltage.
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Preliminary
CMOS IC
OPERATION (Cont.)
3. Discharging overcurrent detector, Short detector
In the state of chargable and dischargabe, if the VM terminal voltage becomes higher than the discharging
overcurrent detection voltage (VDET3) by short of loads, etc., it will detect discharging overcurrent state. If the VM
terminal voltage becomes higher than short detection voltage (Typ.0.5V), it will detect discharging overcurrent state,
too. And then the DO terminal outputs low level, so the external discharging control Nch MOSFET turns OFF, and it
protects from large current discharging.
The discharging overcurrent detection has delay time decided internally. When the VM terminal voltage becomes
higher than the discharging overcurrent detection voltage, it will not detect discharging overcurrent, if the VM terminal
voltage becomes lower than the discharging overcurrent detection voltage within the discharging overcurrent
detection delay time (Typ.8ms). Moreover, the discharging overcurrent release delay time (Typ.1ms) exists, too.
The short detection delay time (Typ.500us) decided internally exists, too.
The discharging overcurrent release resistance (Typ.50kohm) is built into between VM terminal and VSS terminal.
In the state of discharging overcurrent or short, if the load is opened, VM terminal is pulled down to the VSS via the
discharging overcurrent release resistance. And when the VM terminal voltage becomes lower than the discharging
overcurrent detection voltage, it will automatically release discharging overcurrent or short state. The discharging
overcurrent release resistance turns ON, if discharging overcurrent or short is detected. On the normal state
(chargable and dischargable state), the discharging overcurrent release resistance is OFFed.
4. Charging overcurrent detector
In the state of chargable and dischargable, if the VM terminal voltage becomes lower than charging overcurrent
detection voltage (Typ.-0.100V) by abnormal voltage or current charger, etc., it will detect charging overcurrent state.
And then the CO terminal outputs low level, so the external charging control Nch MOSFET turn OFF, and it protects
from large current charging.
It release charging overcurrent state, if the abnormal charger is disconnected, and the load is connected.
The charging overcurrent detection has delay time decided internally. When the VM terminal voltage becomes lower
than the charging overcurrent detection voltage, it will not detect charging overcurrent, if the VM terminal voltage
becomes higher than the charging overcurrent detection voltage within the charging overcurrent detection delay time
(Typ.8ms). Moreover, the charging overcurrent release delay time (Typ.1ms) exists, too.
5. DS (Delay Shortening) function
The delay time of overcharge detection and overdischarge detection can be shortened by making the DS pin to
VDD level voltage. In the DS pin, the pull-down resistance of 15kohm is connected between VSS. Please open the DS
pin when using usually.
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
Preliminary
CMOS IC
TIMING CHART
VM Pin
Battery Voltage
(1) Overcharge, Charging Overcurrent Operations
Connect
Charger
Connect
Load
Connect
Load
Overcurrent Open Charger
Charger
Connect Load
VDET1
VREL1
t
VDD
VDET3
VSS
VDET4
t
tDET1
CO Pin
Connect
Charger
tDET1
tDET4
VDD
tREL1
VM
tREL1
tREL4
t
ICHARGE
0
t
IDISCHARGE
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
Preliminary
CMOS IC
TIMING CHART (Cont.)
DO Pin
VM Pin
Battery Voltage
(2) Overdischarge, Discharging Overcurrent, and Short Operations
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
Preliminary
CMOS IC
TYPICAL APPLICATION CIRCUIT
EB+
R1=100~470Ω
DS
VDD
Battery
UTC UB291
C1=0.1µF
VM
VSS
DO
CO
R2=2.2kΩ
M1
M2
EB-
Notes: 1. R1 and C1 stabilize a supply voltage ripple. However, the detection voltage rises by the current of
penetration in IC of the voltage detection when R1 is enlarged, and the value of R1 is adjusted to 1kohm
or less. Moreover, adjust the value of C1 to 0.01uF or more to do the stability operation, please.
2. R1 and R2 resistors are current limit resistance if a charger is connected reversibly or a high voltage
charger that exceeds the absolute maximum rating is connected. R1 and R2 may cause a power
consumption will be over rating of power dissipation, therefore the ’R1+R2’ should be more than 1kohm.
Moreover, if R2 is too enlarged, the charger connection release cannot be occasionally done after the
overdischarge is detected, so adjust the value of R2 to 10kohm or less, please.
3. C2 and C3 capacitors have effect that the system stability about voltage ripple or imported noise. After
check characteristics, decide that these capacitors should be inserted or not, where should be inserted,
and capacitance value, please.
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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