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. www.unisonic.com.tw Copyright © 2016 Unisonic Technologies Co., Ltd Package SOT-26 Packing Tape Reel 1 of 9 QW-R128-002.b UB291 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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 9 QW-R128-002.b 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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw DO CO 3 of 9 QW-R128-002.b UB291 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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN 4 of 9 QW-R128-002.b UB291 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 9 QW-R128-002.b UB291 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 9 QW-R128-002.b UB291 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 UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 9 QW-R128-002.b UB291 Preliminary CMOS IC TIMING CHART (Cont.) DO Pin VM Pin Battery Voltage (2) Overdischarge, Discharging Overcurrent, and Short Operations UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 9 QW-R128-002.b UB291 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 9 QW-R128-002.b