DW01

DW01 One Cell Lithium-ion/Polymer Battery Protection IC Description The DW01 battery protection IC is designed to protect lithium-ion/polymer battery from damage or degrading the lifetime due to overcharge, overdischarge, and/or overcurrent for onecell lithium-ion/polymer battery powered systems, such as cellular phones. The ultra-small package and less required external components make it ideal to integrate the DW01 into the limited space of battery pack. The accurate ±50mV overcharging detection voltage ensures safe and full utilization charging. The very low standby current drains little current from the cell while in storage. Features  High precision voltage detection circuit;  Each delay time is set by internal circuit (no external capacitor is required);  Over discharge recovery function;  Low power consumption current;  Allow to charge 0V battery;  The recommended capacity of lithium-ion batteries is 1000mA/h or less;  The loaded cell needs to be activated;  Operating temperature range：-40℃~+85℃  Miniature Package：SOT-23-6. Applications  Protection IC for One-Cell Lithium-Ion /Lithium-Polymer Battery Pack www.pingjingsemi.com Revision:1.0 May-2019 1 / 10 DW01 One Cell Lithium-ion/Polymer Battery Protection IC Pin Distribution SOT-23-6 6.GND 5.VCC 4.TD 6 5 4 TOP VIEW 1 2 3 1.OD 2.CS 3.OC Pin Function Pin No. Symbol Description 1 OD MOSFET gate connection pin for discharge control 2 CS Input pin for current sense, charger detect 3 OC MOSFET gate connection pin for charge control 4 TD Test pin for reduce delay time 5 VCC Power supply, through a resistor (R1) 6 GND Ground pin www.pingjingsemi.com Revision:1.0 May-2019 2 / 10 DW01 One Cell Lithium-ion/Polymer Battery Protection IC Product Name List parameter Overcharge detection voltage Overcharge release voltage VOCP VOCR VODP 4.30V 4.10V 2.40V Model DW01 Overdischarge Overdischarge release detection voltage voltage Charging function to 0V battery Extra Functions VODR V0V - 3.00V allow self-recovery function TD Block Diagram VCC Short circuit Detector VSS VSS Oscillator Control Circuit Overcharge Detector Over current Detector VSS Divider Control Logic Overdischarg e Detector CS Charger Detector GND Control Logic VSS OC OD VSS Typical Application Circuit BATT+ R1 100Ω VCC C1 0.1μF DW01 GND OC CS OD TD R2 1kΩ M1 M2 BATT- www.pingjingsemi.com Revision:1.0 May-2019 3 / 10 DW01 One Cell Lithium-ion/Polymer Battery Protection IC Absolute Maximum Ratings (Ta=25°C unless otherwise specified) Item Symbol Unit Rating VCC GND-0.3~GND+10 V OC output pin voltage VOC VCC-14~VCC+0.3 V OD output pin voltage VOD GND-0.3~VCC+0.3 V CS input pin voltage VCS VCC-14~VCC+0.3 V Operating Temperature Range TOP -40~+85 ℃ Storage Temperature Range TST -40~+125 ℃ Input voltage between VCC and GND Note Note: DW01 contains a circuit that will protect it from static discharge; but please take special care that no excessive static electricity or voltage which exceeds the limit of the protection circuit will be applied to it. Absolute Maximum Ratings (TA =25℃ unless otherwise specified) PARAMETER TEST CONDITIONS SYMBOL Min Typ Max UNIT VCC VCC 2 3.6 5 V Supply Current VCC=3.9V ICC 1.8 3.0 6.0 uA Power-Down Current VCC=2.0V IPD 0.1 0.6 uA Overdischarge self-restoring current VCC=2.0V IOD 2.0 3.0 uA Operating Voltage Overcharge Protection Voltage VOCP 4.25 4.30 4.35 V Overcharge Release Voltage VOCR 4.05 4.10 4.15 V Overdischarge Protection Voltage VODP 2.30 2.40 2.50 V Overdischarge Release Voltage VODR 2.90 3.00 3.10 V Overcurrent Protection Voltage VOI1 120 150 180 mV VOI2 0.70 1.00 1.30 V TOC 100 200 ms Short Current Protection Voltage VCC=3.6V Overcharge Delay Time Overdischarge Delay Time VCC=3.6V to 2.0V TOD 50 100 ms Overcurrent Delay Time (1) VCC=3.6V TOI1 10 20 ms Overcurrent Delay Time (2) VCC=3.6V TOI2 50 400 us VCC=3.6V，CS=-1.2V TCIP 10 20 ms Charge overcurrent delay time Load detection voltage VLD 0.12 0.15 0.18 V Charger Detection Threshold Voltage VCH -1.2 -0.7 -0.2 V Charging overcurrent detection voltage VCIP -1.2 -0.7 -0.2 V OD Pin Output “H” Voltage VODH VCC-0.1 VCC-0.02 OD Pin Output “L” Voltage VODL OC Pin Output “H” Voltage VOCH OC Pin Output “L” Voltage VOCL Charger starting voltage (Allow charging to 0V battery) battery voltage (Do not charge 0V battery) www.pingjingsemi.com Revision:1.0 May-2019 0.1 VCC-0.1 V 0.5 VCC-0.02 V V 0.1 0.5 V Allow charging to 0V battery VOV 1.2 - - V Do not charge 0V battery V0IN - - 0.5 V 4 / 10 DW01 One Cell Lithium-ion/Polymer Battery Protection IC Description of Operation 1.. Overcharge Protection When the voltage of the battery cell exceeds the overcharge protection voltage (VOCP) beyond the overcharge delay time (TOC) period, charging is inhibited by turning off of the charge control MOSFET. The overcharge condition is released in two cases: 1) The voltage of the battery cell becomes lower than the overcharge release voltage (VOCR) through self-discharge. 2) The voltage of the battery cell falls below the overcharge protection voltage (VOCP) and a load is connected. When the battery voltage is above VOCP, the overcharge condition will not release even a load is connected to the pack. 2. Overdischarge Protection When the voltage of the battery cell goes below the overdischarge protection voltage (VODP) beyond the overdischarge delay time (TOD) period, discharging is inhibited by turning off the discharge control MOSFET. The default of overdischarge delay time is 10ms. Inhibition of discharging is immediately released when the voltage of the battery cell becomes higher than overdischarge release voltage (VODR) through charging. 3. Overcurrent Protection In normal mode, the DW01 continuously monitors the discharge current by sensing the voltage of CS pin. If the voltage of CS pin exceeds the overcurrent protection voltage (VOIP) beyond the overcurrent delay time (TOI1) period, the overcurrent protection circuit operates and discharging is inhibited by turning off the discharge control MOSFET. The overcurrent condition returns to the normal mode when the load is released or the impedance between BATT+ and BATT- is larger than 500kΩ. The DW01 provides two overcurrent detection levels (0.15V and 1.35V) with two overcurrent delay time (TOI1 and TOI2) corresponding to each overcurrent detection level. 4. Charge Detection after Overdischarge When overdischarge occurs, the discharge control MOSFET turns off and discharging is inhibited. However, charging is still permitted through the parasitic diode of MOSFET. Once the charger is connected to the battery pack, the DW01 immediately turns on all the timing generation and detection circuitry. Charging progress is sensed if the voltage between CS and GND is below charge detection threshold voltage (VCH). 5. Power-Down after Overdischarge When overdischarge occurs, the DW01 will enter into power-down mode, turning off all the timing generation and detection circuitry to reduce the quiescent current to 0.1μA (VCC=2.0V). At the same time, the CS pin is pull-up to VCC through an internal resistor. www.pingjingsemi.com Revision:1.0 May-2019 5 / 10 DW01 One Cell Lithium-ion/Polymer Battery Protection IC Design Guide 1. Selection of External Control MOSFET Because the overcurrent protection voltage is preset, the threshold current for overcurrent detection is determined by the turn-on resistance of the charge and discharge control MOSFETs. The turn-on resistance of the external control MOSFETs can be determined by the equation: RON=VOIP/ (2 x IT) (IT is the overcurrent threshold current). For example, if the overcurrent threshold current IT is designed to be 3A, the turn-on resistance of the external control MOSFET must be 25mΩ. Be aware that turn-on resistance of the MOSFET changes with temperature variation due to heat dissipation. It changes with the voltage between gate and source as well. (Turn-on resistance of MOSFET increases as the voltage between gate and source decreases). As the turn-on resistance of the external MOSFET changes, the design of the overcurrent threshold current changes accordingly. 2. Suppressing the Ripple and Disturbance from Charger To suppress the ripple and disturbance from charger, connecting R1 and C1 to VCC is recommended. 3. Protection the CS pin R2 is used for latch-up protection when charger is connected under overdischarge condition and overstress protection at reverse connecting of a charger. www.pingjingsemi.com Revision:1.0 May-2019 6 / 10 DW01 One Cell Lithium-ion/Polymer Battery Protection IC Timing Diagram 1.. Overcharge Condition Load Discharging Normal Condition Charger Load Battery Voltage VOCP VOCR VODR VODP OC Pin VCC CS OD Pin VCC GND CS Pin VCC VOI1 GND VCH TOC www.pingjingsemi.com Revision:1.0 May-2019 TOC 7 / 10 DW01 One Cell Lithium-ion/Polymer Battery Protection IC 2. Overdischarge Condition Charging by a Charger Normal Condition Charger Load Battery Voltage VOCP VOCR VODR VODP OC Pin VCC CS OD Pin VCC CS Pin GND VCC VOI2 GND VCH TOD www.pingjingsemi.com Revision:1.0 May-2019 TOD 8 / 10 DW01 One Cell Lithium-ion/Polymer Battery Protection IC 3. Over Current Condition Normal Condition Charger Load Battery Voltage VOCP VOCR VODR VODP OC Pin VCC CS OD Pin VCC CS Pin GND VCC VOI2 VOI1 GND TOI1 www.pingjingsemi.com Revision:1.0 May-2019 TOI2 9 / 10 DW01 One Cell Lithium-ion/Polymer Battery Protection IC Package Outline SOT-23-6 Dimensions in mm 2.92 ±0.05 1.9 0.127± 0.03 ± 0.01 10 1.6 2.8 ±0.1 ±0.05 A 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 DW01 SOT-23-6 3,000/ Tape & Reel (7 inches) www.pingjingsemi.com Revision:1.0 May-2019 10 / 10