DW03

DW03 One Cell Lithium-ion/Polymer Battery Protection IC Description The DW03 is a high integration solution for lithium-ion/polymer battery protection. DW03 contains internal power MOSFET, high-accuracy voltage detection circuits and delay circuits. DW03 as all the protection functions required in the battery application including overcharging, over discharging, overcurrent and load short circuiting protection etc. The accurate overcharging detection voltage ensures safe and full utilization charging. The low standby current drains little current from the cell while in storage. The device is not only targeted for digital cellular phones, but also for any other Li-Ion and Li-Poly battery-powered information appliances requiring long-term battery life. The DW03 requires a minimal number of readily available, external components and is available in a space saving SOT-23-5 package. Features  Protection of Charger Reverse Connection  Protection of Battery Cell Reverse Connection  Over-temperature Protection  Overcharge Current Protection  Two-step Overcurrent Detection: Over Discharge Current Load Short Circuiting  Charger Detection Function  0V Battery Charging Function  12mΩ Low RSS(ON) Internal Power MOSFET  Delay Times are generated inside  High-accuracy Voltage Detection  Low Current Consumption Operation Mode: 2.5μA Typ. Power-down Mode: 1.5μA Typ.  Only One External Capacitor Required  -40°C to +85°C Temperature Range  RoHS Compliant and Lead (Pb) Free  Available in SOT-23-5 Package Applications  Protection IC for One-Cell Lithium-Ion /Lithium-Polymer Battery Pack www.pingjingsemi.com Revision:1.0 May-2019 1 / 10 DW03 One Cell Lithium-ion/Polymer Battery Protection IC Pin Distribution Pin Function Pin No. Symbol Description 1 NC 2 GND Grounding end, battery core negative pole 3 VDD Power Supply Pin 4 VM Charger minus voltage input pin 5 VM Charger minus voltage input pin No Connect Typical Application Circuit Charger + 1KΩ R1 3 VDD + Battery 4 VM 0.1μF C1 5 VM Charger 2 GND www.pingjingsemi.com Revision:1.0 May-2019 2 / 10 DW03 One Cell Lithium-ion/Polymer Battery Protection IC Absolute Maximum Ratings Note1，2 (Ta=25°C unless otherwise specified) Item Symbol Rating Unit VDD -0.3V~6V V VM Input voltage VM -6V~10V V Thermal Resistance,Junction-to-Ambient RθJA 250 ℃/W Thermal Resistance,Junction-to-Case RθJC 130 ℃/W Operating Temperature Range TOPR -40~+85 ℃ TJ +125 ℃ Storage Temperature Range TSTG -55~+150 ℃ ESD (Human Body Made) HMB ESD 2000 V VDD Input voltage Junction Temperature Note: 1. Exceeding these ratings may damage the device. 2. The device is not guaranteed to function outside of its operating conditions. Absolute Maximum Ratings (TA =25℃ unless otherwise specified) PARAMETER SYMBOL Min. Typ. Max. UNIT Overcharge Detection Voltage VCU 4.25 4.3 4.35 V Overcharge Release Voltage VCL 4.05 4.1 4.15 V Overdischarge Detection Voltage VDL 2.3 2.4 2.5 V Overdischarge Release Voltage VDR 2.9 3.0 3.1 V TEST CONDITIONS Detection Voltage Charger Detection Voltage V -0.12 VCHA Detection Current Overdischarge Current1 Detection VDD=3.6V IIOV1 2.7 3.5 4.4 A Load Short-Circuiting Detection VDD=3.6V ISHORT 10 20 30 A VDD=3.6V,VM=0V IOPE 2 2.5 5 μA VDD=2.0V,VM floating IPDN 1 1.5 3 μA Resistance between VM and VDD VDD=3.6V,VM=1V RVMD 100 300 500 KΩ Resistance between VM and GND VDD=2.0V,VM=1V RVMS 10 20 40 KΩ VDD=3.6V,IVM=1A RDS(ON) 35 40 50 mΩ Current Consumption Current Consumption in Operation Current Consumption in power Down VM Internal Resistance FET on Resistance Equivalent FET on Resistance Over Temperature Protection Over Temperature Protection TSHD+ 130 ℃ Over Temperature Recovery Degree TSHD- 100 ℃ Overcharge Voltage Detection Delay Time tCU 128 200 mS Overdischarge Voltage Detection Delay Time tDL 20 40 mS Detection Delay Time Overdischarge Current Detection Delay Time VDD=3.6V tIOV 5 10 20 mS Load Short-Circuiting Detection Delay Time VDD=3.6V tSHORT 100 200 400 μS www.pingjingsemi.com Revision:1.0 May-2019 3 / 10 DW03 One Cell Lithium-ion/Polymer Battery Protection IC Functional Block Diagram VDD GND Voltage Driver OCC Comp BG ODV Comp OCV Comp OSC ODC1 Comp Charge Detection Logic Controller OTP SC Comp ODC2 Comp VM Functions Description The DW03 monitors the voltage and current of a battery and protects it from being damaged due to overcharge voltage, over discharge voltage, over discharge current, and short circuit conditions by disconnecting the batter from the load or charger. These functions are required in order to operate the battery cell within specified limits. The device requires only one external capacitor. The MOSFET is integrated and its RDS(ON) is as low as 40mΩ typical. Normal operating mode If no exception condition is detected, charging and discharging can be carried out freely. This condition is called the normal operating mode. Overcharge Condition When the battery voltage becomes higher than the overcharge detection voltage (VCU) during charging under normal condition and the state continues for the overcharge detection delay time (tCU) or longer, the DW03 turns the charging control FET off to stop charging. This condition is called the overcharge condition. The overcharge condition is released in the following two cases: www.pingjingsemi.com Revision:1.0 May-2019 4 / 10 DW03 One Cell Lithium-ion/Polymer Battery Protection IC 1. When the battery voltage drops below the overcharge release voltage (VCL), the DW03 turns the charging control FET on and returns to the normal condition. 2. When a load is connected and discharging starts, the DW03 turns the charging control FET on and returns to the normal condition. The release mechanism is as follows: the discharging current flows through an internal parasitic diode of the charging FET immediately after a load is connected and discharging starts, and the VM pin voltage increases about 0.7V (forward voltage of the diode) from the GND pin voltage momentarily. The DW03 detects this voltage and releases the overcharge condition. Consequently, in the case that the battery voltage is equal to or lower than the overcharge detection voltage (VCU), the DW03 returns to the normal condition immediately, but in the case the battery voltage is higher than the overcharge detection voltage (VCU), the chip does not return to the normal condition until the battery voltage drops below the overcharge detection voltage (VCU) even if the load is connected. In addition, if the VM pin voltage is equal to or lower than the overcurrent1 detection voltage when a load is connected and discharging starts, the chip does not return to the normal condition. Remark If the battery is charged to a voltage higher than the overcharge detection voltage (VCU) and the battery voltage does not drop below the overcharge detection voltage (VCU) even when a heavy load, which causes an overcurrent, is connected, the overcurrent1 and overcurrent2 do not work until the battery voltage drops below the overcharge detection voltage (VCU). Since an actual battery has, however, an internal impedance of several dozens of mΩ, and the battery voltage drops immediately after a heavy load which causes an overcurrent is connected, the overcurrent1 and overcurrent2 work. Detection of load short circuiting works regardless of the battery voltage. Overdischarge Condition When the battery voltage drops below the overdischarge detection voltage (VDL) during discharging under normal condition and it continues for the overdischarge detection delay time (tDL) or longer, the DW03 turns the discharging control FET off and stops discharging. This condition is called overdischarge condition. After the discharging control FET is turned off, the VM pin is pulled up by the RVMD resistor between VM and VDD in DW03. Meanwhile when VM is bigger than 1.5 V (typ.) (the load short-circuiting detection voltage), the current of the chip is reduced to the power-down current (IPDN). This condition is called power-down condition. The VM and VDD pins are shorted by the RVMD resistor in the IC under the overdischarge and power-down conditions. The power-down condition is released when a charger is connected and the potential difference between VM and VDD becomes 1.3 V (typ.) or higher (load shortcircuiting detection voltage). At this time, the FET is still off. When the battery voltage becomes the overdischarge detection voltage (VDL) or higher (see note), the DW03 turns the FET on and changes to the normal condition from the overdischarge condition. Remark If the VM pin voltage is no less than the charger detection voltage (VCHA), when the battery under overdischarge condition is connected to a charger, the overdischarge condition is released (the discharging control FET is turned on) as usual, provided that the battery voltage reaches the overdischarge release voltage (VDU) or higher. www.pingjingsemi.com Revision:1.0 May-2019 5 / 10 DW03 One Cell Lithium-ion/Polymer Battery Protection IC Overcurrent Condition When the discharging current becomes equal to or higher than a specified value (the VM pin voltage is equal to or higher than the overcurrent detection voltage) during discharging under normal condition and the state continues for the overcurrent detection delay time or longer, the DW03 turns off the discharging control FET to stop discharging. This condition is called overcurrent condition. (The overcurrent includes overcurrent, or load shortcircuiting.) The VM and GND pins are shorted internally by the RVMS resistor under the overcurrent condition. When a load is connected, the VM pin voltage equals the VDD voltage due to the load. The overcurrent condition returns to the normal condition when the load is released and the impedance between the B+ and B- pins becomes higher than the automatic recoverable impedance. When the load is removed, the VM pin goes back to the GND potential since the VM pin is shorted the GND pin with the RVMS resistor. Detecting that the VM pin potential is lower than the overcurrent detection voltage (VIOV1), the IC returns to the normal condition. Abnormal Charge Current Detection The VM pin voltage drops below the charger detection voltage (VCHA) during charging under the normal condition and it continues for the overcharge detection delay time (tCU) or longer, the DW03 turns the charging control FET off and stops charging. This action is called abnormal charge current detection. Abnormal charge current detection works when the discharging control FET is on and the VM pin voltage drops below the charger detection voltage (VCHA). When an abnormal charge current flows into a battery in the overdischarge condition, the DW03 consequently turns the charging control FET off and stops charging after the battery voltage becomes the overdischarge detection voltage and the overcharge detection delay time (tCU) elapses. Abnormal charge current detection is released when the voltage difference between VM pin and GND pin becomes lower than the charger detection voltage (VCHA) by separating the charger. Since the 0V battery charging function has higher priority than the abnormal charge current detection function, abnormal charge current may not be detected by the product with the 0V battery charging function while the battery voltage is low. Load Short-circuiting condition If voltage of VM pin is equal or below short-circuiting protection voltage (VSHORT), the DW03 will stop discharging and battery is disconnected from load. The maximum delay time to switch current off is tSHORT. This status is released when voltage of VM pin is higher than short protection voltage (VSHORT), such as when disconnecting the load. Delay Circuits The detection delay time for overdischarge current 2 and load short-circuiting starts when overdischarge current1 is detected. As soon as overdischarge current2 or load short-circuiting is detected over detection delay time for overdischarge current2 or load short-circuiting, the DW03 stops discharging. When battery voltage falls below overdischarge detection voltage due to overdischarge current, the DW03 stop discharging by overdischarge current detection. In this case the recovery of battery voltage is so slow that if battery voltage after overdischarge voltage detection delay time is still lower than overdischarge detection voltage, the DW03 shifts to power-down. www.pingjingsemi.com Revision:1.0 May-2019 6 / 10 DW03 One Cell Lithium-ion/Polymer Battery Protection IC 0V Battery Charging Function Note This function enables the charging of a connected battery whose voltage is 0V by selfdischarge. When a charger having 0V battery start charging charger voltage (V0CHA) or higher is connected between B+ and B- pins, the charging control FET gate is fixed to VDD potential. When the voltage between the gate and the source of the charging control FET becomes equal to or higher than the turn-on voltage by the charger voltage, the charging control FET is turned on to start charging. At this time, the discharging control FET is off and the charging current flows through the internal parasitic diode in the discharging control FET. If the battery voltage becomes equal to or higher than the overdischarge release voltage (VDU), the normal condition returns. Note：1.Some battery providers do not recommend charging of completely discharged batteries. Please refer to battery providers before the selection of 0 V battery charging function. 2.The 0V battery charging function has higher priority than the abnormal charge current detection function. Consequently, a product with the 0 V battery charging function charges a battery and abnormal charge current cannot be detected during the battery voltage is low (at most 1.8 V or lower). 3.When a battery is connected to the IC for the first time, the IC may not enter the normal condition in which discharging is possible. In this case, set the VM pin voltage equal to the GND voltage (short the VM and GND pins or connect a charger) to enter the normal condition. Timing Chart Overcharge and overdischarge detection www.pingjingsemi.com Revision:1.0 May-2019 7 / 10 DW03 One Cell Lithium-ion/Polymer Battery Protection IC Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4) Overcurrent condition Overdischarge current detection Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4) Overcurrent condition Charger Detection www.pingjingsemi.com Revision:1.0 May-2019 8 / 10 DW03 One Cell Lithium-ion/Polymer Battery Protection IC Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4) Overcurrent condition Abnormal Charger Detection Remark: (1) Normal condition (2) Overcharge voltage condition (3) Overdischarge voltage condition (4) Overcurrent condition Typical Application As shown in Typical Application Circuit, the bold line is the high density current path which must be kept as short as possible. For thermal management, ensure that these trace widths are adequate.C1& R1 is a decoupling capacitor & resistor which should be placed as close as possible to DW03. Precautions • Pay attention to the operating conditions for input/output voltage and load current so that the power loss in DW03 does not exceed the power dissipation of the package. • Do not apply an electrostatic discharge to this DW03 that exceeds the performance ratings of the built-in electrostatic protection circuit. www.pingjingsemi.com Revision:1.0 May-2019 9 / 10 DW03 One Cell Lithium-ion/Polymer Battery Protection IC Package Outline SOT-23-5 Dimensions in mm 2.92 ± 0.05 1.9 0.127± 0.03 ± 0.01 A 1.6 2.8 ±0.1 ±0.05 10 12 0.95 R0.15MAX `4X 0.35 R0.15MAX `4X 1.26MAX 0.06 12 ± 0.05 ± 0.03 0.65 1.1 ± 0.05 10 Ordering Information Device Package Shipping DW03 SOT-23-5 3,000/ Tape & Reel (7 inches) www.pingjingsemi.com Revision:1.0 May-2019 10 / 10