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PDF UB211C Data sheet ( Hoja de datos )
| Número de pieza | UB211C | |
| Descripción | 1-CELL LITHIUM-ION/POLYMER BATTERY PROTECTION IC | |
| Fabricantes | Unisonic Technologies | |
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UNISONIC TECHNOLOGIES CO., LTD
UB211C
Preliminary
1-CELL LITHIUM-ION/POLYMER
BATTERY PROTECTION IC
CMOS IC
DESCRIPTION
UTC UB211C is a series of lithium-ion / lithium-polymer
rechargeable battery protection ICs incorporating high accuracy
voltage detection circuits and delay circuits.
UTC UB211C 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 requirement of external
components make it ideal to integrate the UTC UB211C into the
limited space of battery pack.
FEATURES
* Wide Supply Voltage Range: VDD=1.5V~8.0V
* Ultra-Low Quiescent Current: IOPE=3.0μA (VDD=3.5V)
* Ultra-Low Power-Down Current: IPDN=0.2μA (VDD=1.5V)
* 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: VDOIV=0.05V~0.30V
* Discharge Short Circuit Detection Voltage: VSHORT=0.5V (Fixed)
* Charge Over Current Voltage: VCOIV=-0.1V (Fixed)
* Charger Detection Voltage: VCHA=-0.7V (Fixed)
* Delay Times are Generated by an Internal Circuit. (External Capacitors are Unnecessary.)
ORDERING INFORMATION
Ordering Number
UB211CG-xx-AF5-R
Note: xx: Output Voltage, refer to Marking Information.
Package
SOT-25
Packing
Tape Reel
www.unisonic.com.tw
Copyright © 2015 Unisonic Technologies Co., Ltd
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UB211C
Preliminary
CMOS IC
OPERATION
1. Normal Condition
This IC monitors the voltage of the battery connected between the VDD pin and VSS pin and the voltage
difference between the VM pin and VSS pin to control charging and discharging. When the battery voltage is in the
range from overdischarge detection voltage (VDL) to 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 conditon, and in
this condition charging and discharging can be carried out freely.
The resistance (RVMD) between the VM pin and VDD pin, and the resistance (RVMS) between the VM pin and VSS
pin are not connected in the normal status.
Note: When the battery is connected 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 overcharge detection voltage (VCU) during charging in the
normal condition and this state continues for the overcharge detection delay time (tCU), the UTC UB211C Series
turns the charging control FET off to stop charging. This state is called the overcharge condition.
The resistance (RVMD) between the VM pin and VDD pin, and the resistance (RVMS) between the VM pin and VSS
pin are not connected in the overcharge condition.The overcharge condition is released in 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), UTC UB211C 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), UTC
UB211C Series releases the overcharge condition when the battery voltage falls below the overcharge detection
voltage (VCU).
The discharge is started by connecting a load after the overcharge detection, the VM pin voltage rises more
than the voltage at VSS pin, because the discharge current flows through the charging control FET. If this VM pin
voltage is higher than or equal to the discharge overcurrent detection voltage (VDIOV), UTC UB211C Series releases
the overcharge status when the battery voltage is lower than or equal to the overcharge detection voltage (VCU).
For the actual application boards, changing the battery voltage and the charger voltage simultaneously enables
to measure the overcharge release voltage (VCL). In this case, the charger is always necessary to have the
equivalent voltage level to the battery voltage. The charger keeps VM pin voltage higher than or equal to the charge
overcurrent detection voltage (VCIOV) and lower than or equal to the discharge overcurrent detection voltage (VDIOV).
UTC UB211C Series releases the overcharge status when the battery voltage falls below the overcharge release
voltage (VCL).
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 shortcircuiting 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 overdischarge detection voltage (VDL) during discharging in the normal
status and the detection continues for the overdischarge detection delay time (tDL) or longer, the UTC UB211C
Series turns the discharging control FET off to stop discharging. This condition is called the overdischarge status.
Under the overdischarge status, the VM pin voltage is pulled up by the resistor between the VM pin and VDD pin in
the IC (RVMD). When voltage difference between the VM pin and VDD pin then is 1.3 V (Typ.) or lower, the current
consumption is reduced to the power-down current consumption (IPDN). This condition is called the power-down
status. The resistance (RVMS) between the VM pin and VSS pin is not connected in the power-down status and the
overdischarge status.
The power-down status is released when a charger is connected and the voltage difference between the VM pin
and VDD pin becomes 1.3 V (typ.) or higher.
When a battery in the overdischarge condition is connected to a charger and provided that the VM pin voltage is
lower than -0.7 V (Typ.), the UTC UB211C Series releases the overdischarge status and turns the discharging FET
on when the battery voltage reaches overdischarge detection voltage (VDL) or higher.
When a battery in the overdischarge status is connected to a charger and provided that the VM pin voltage is
not lower than -0.7 V (Typ.), the UTC UB211C Series releases the overdischarge status when the battery voltage
reaches overdischarge release voltage (VDU) or higher.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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| PDF Descargar | [ Datasheet UB211C.PDF ] | |
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