UNISONIC TECHNOLOGIES CO., LTD UB261 Preliminary CMOS IC 1-CELL LITHIUM-ION/POLYMER BATTERY PROTECTION IC DESCRIPTION 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. * * * * * * * * * * * * 6 5 4 1 2 3 SOT-26 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 Over Current 1 Detection Voltage: VIOV1=0.05V~0.30V Over Current 2 Detection Voltage: VIOV2=0.5V (Fixed) Short Circuit Detection Voltage: VSHORT=1.2V (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 UB261G-xx-AG6-R xx: Output Voltage, refer to Marking Information. www.unisonic.com.tw Copyright © 2014 Unisonic Technologies Co., Ltd Package SOT-26 Packing Tape Reel 1 of 10 QW-R502-A27.b UB261 Preliminary CMOS IC MARKING INFORMATION PACKAGE VOLTAGE CODE (Note) SOT-26 XX MARKING Note: Refer to Serial Code List SERIAL CODE LIST Model Code UB261 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 PIN CONFIGURATION PIN DESCRIPTION PIN NO. 1 2 3 4 5 6 PIN NAME DO VM CO DP 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 [VIOV1](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 Test pin for delay time measurement Positive power input Negative power input UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 2 of 10 QW-R502-A27.b UB261 Preliminary CMOS IC BLOCK DIAGRAM 0V Battery Charge Inhibition Detector VDD VM Oscillator Short circuit Detector Charger Detector Divider Over current 2 Detector Overdischarge Detector Control Logic VM Overcharge Detector Over current 1 Detector From Oscillator VSS DP UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw DO CO 3 of 10 QW-R502-A27.b UB261 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 2) VDD VSS-0.3 ~ VSS+12 V CO Output Pin Voltage VCO VDD-12 ~ VDD+0.3 V DO Output Pin Voltage VDO VSS-0.3 ~ VDD+0.3 V VM Input Pin Voltage VM VDD-14 ~ 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=3.5V, VM=0V Power-Down Current IPDN VDD=VM=1.5V 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 VCU Overcharge Release Voltage VCL Overdischarge Detection Voltage VDL Overdischarge Release Voltage VDU Over Current 1 Detection Voltage VIOV1 VDD=3.5V Over Current 2 Detection Voltage VIOV2 VDD=3.5V Load Short Circuit Detection Voltage VSHORT Charger Detection Voltage VCHA VDU≠VDL 0V BATTERY CHARGE VOLTAGE 0V Battery Charge Inhibition Battery V0INH Voltage INTERNAL RESISTANCE Resistance between VM-pin and RVMD VDD=1.8V, VM=0V VDD-pin Resistance between VM-pin and RVMS VDD=3.5V, VM=1.0V VSS-pin OUTPUT RESISTANCE CO-pin Resistance “H” RCOH VCO=3.0V, VDD=3.5V, VM=0V CO-pin Resistance “L” RCOL VCO=0.5V, VDD=4.5V, VM=0V DO-pin Resistance “H” RDOH VDO=3.0V, VDD=3.5V, VM=0V DO-pin Resistance “L” RDOL VDO=0.5V, VDD=VM=1.8V DELAY TIME Overcharge Detection Delay Time tCU Overdischarge Detection Delay Time tDL Over Current 1 Detection Delay Time tIOV1 VDD=3.5V Over Current 2 Detection Delay Time tIOV2 VDD=3.5V Short Circuit Detection Delay Time tSHORT UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw MIN TYP MAX UNIT 3.0 0.2 8.0 0.5 μA μA 1.5 8 V 1.5 10 V VCU+0.050 VCL+0.050 VDL+0.100 VDU+0.100 VIOV1+0.03 0.65 1.7 -0.2 V V V V V V V V 0.9 1.8 V 100 300 900 kΩ 10 30 70 kΩ 5 5 5 5 10 10 10 10 kΩ kΩ kΩ kΩ 1.2 150 9 2.2 300 1.5 190 12 3.2 380 s ms ms ms µs VCU-0.050 VCU VCL-0.050 VCL VDL-0.100 VDL VDU-0.100 VDU VIOV1-0.03 VIOV1 0.35 0.50 0.5 1.2 -1.6 -0.7 0.9 110 6 1 120 4 of 10 QW-R502-A27.b UB261 Preliminary CMOS IC OPERATION 1. Normal Condition The UTC UB261 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 charger detection voltage (VCHA) to the overcurrent 1 detection voltage (VIOV1), 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. Overcurrent Condition When a battery in the normal status is in the status where the voltage of the VM 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 VM and VSS pins are shorted by the resistor between VM and VSS (RVMS) in the IC. However, the voltage of the VM pin is at the VDD potential due to the load as long as the load is connected. When the load is disconnected, the VM pin returns to the VSS 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 VM pin returns to overcurrent detection voltage 1 (VIOV1) 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 (VCU) during charging under the normal condition and the detection continues for the overcharge detection delay time (tCU), 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 (VCL), 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 VM pin potential becomes Vf, the voltage for the parasitic diode, higher than VSS level. When the battery voltage goes under the overcharge detection voltage (VCU) and provided that the VM 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 (VCU) and the battery voltage does not fall below the overcharge detection voltage (VCU) 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 (VCU). 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 (VCL). The overcharge condition is released when the VM pin voltage goes over the charger detection voltage (VCHA) by removing the charger. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 5 of 10 QW-R502-A27.b UB261 Preliminary CMOS IC OPERATION(Cont.) 4. 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 UB261 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 UB261 series turns the discharging FET on and returns to the normal condition. 5. Charger Detection When a battery in the overdischarge condition is connected to a charger and provided that the VM pin voltage is lower than the charger detection voltage (VCHA), the UTC UB261 series releases the overdischarge condition and turns the discharging control FET on when the battery voltage becomes equal to or higher than the overdischarge detection voltage (VDL) since the charger detection function works. This action is called charger detection. When a battery in the overdischarge condition is connected to a charger and provided that the VM pin voltage is not lower than the charger detection voltage (VCHA), the UTC UB261 series releases the overdischarge condition when the battery voltage reaches the overdischarge detection voltage (VDU) or higher. 6. Abnormal Charge Current Detection If the VM pin voltage falls below the charger detection voltage (VCHA) during charging under normal condition and it continues for the overcharge detection delay time (tCU) , the charging control FET turns off and charging stops. This action is called the abnormal charge current detection. Abnormal charge current detection works when the DO pin voltage is “H” and the VM pin voltage falls below the charger detection voltage (VCHA). Consequently, if an abnormal charge current flows to an over-discharged battery, the UTC UB261 series turns the charging control FET off and stops charging after the battery voltage becomes higher than the overdischarge detection voltage which make the DO pin voltage “H”, and still after the overcharge detection delay time (tCU) elapses. Abnormal charge current detection is released when the voltage difference between VM pin and VSS pin becomes less than charger detection voltage (VCHA). 7. Delay Circuits The detection delay times are determined by dividing a clock of the approximately 3.5kHz with the counter. Note 1: The detection delay time for overcurrent 2 (tIOV2) and load short-circuiting (tSHORT) start when the overcurrent 1 (VIOV1) is detected. When the overcurrent 2 (VIOV2) or load short-circuiting (VSHORT) is detected over the detection delay time for each of them (= tIOV2 or tSHORT) after the detection of overcurrent 1 (VIOV1), the UTC UB261 series turns the FET off within tIOV2 or tSHORT of each detection. Note 2: When the overcurrent is detected and continues for longer than the overdischarge detection delay time (tDL) without releasing the load, the condition changes to the power-down condition when the battery voltage falls below the overdischarge detection voltage (VDL). When the battery voltage falls below the overdischarge detection voltage (VDL) due to the overcurrent, the UTC UB261 series turns the discharging control FET off by the overcurrent detection. In this case the recovery of the battery voltage is so slow that if the battery voltage after the overdischarge detection delay time (tDL) is still lower than the over discharge detection voltage (VDL), the UTC UB261 series shifts to the power-down condition. 8. 0V Battery Charge Inhibiting Function This function inhibits the recharging when a battery that is short-circuited (0V battery) internally is connected. When the battery voltage is the 0V battery charge inhibition battery voltage (V0INH) or lower, the charging control FET gate is fixed to EB- pin voltage to inhibit charging. When the battery voltage is the 0V battery charge inhibition battery voltage (V0INH) or higher, charging can be performed. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 6 of 10 QW-R502-A27.b UB261 Preliminary CMOS IC TIMING CHART VM Pin DO Pin CO Pin Battery Voltage (1) Overcharge Detection, Overdischarge Detection UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 7 of 10 QW-R502-A27.b UB261 Preliminary CMOS IC TIMING CHART (Cont.) VM Pin DO Pin CO Pin Battery Voltage (2) Discharge Overcurrent Detection UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 8 of 10 QW-R502-A27.b UB261 Preliminary CMOS IC TIMING CHART (Cont.) VM Pin DO Pin CO Pin Battery Voltage (3) Abnormal Charge Overcurrent Detection UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 9 of 10 QW-R502-A27.b UB261 Preliminary CMOS IC TYPICAL APPLICATION CIRCUIT EB+ R1=100~470Ω DP VDD Battery UTC UB261 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. UNISONIC TECHNOLOGIES CO., LTD www.unisonic.com.tw 10 of 10 QW-R502-A27.b