DW01

Lithium-ion/Polymer Battery Protection IC General Description The DW01 battery protection IC is design ed to protect lithium-ion/polymer battery from damage or degrading the lifetime due to overcharge, overdischarge, and/or overcurrent for one-cell 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. DW01 Ordering Information DW01 PACKAGE TYPE SOT-23-6 TEMPERATURE RANGE -40°C~+85°C OVERCHARGE PROTECTION 4.3V± 50mV Features Reduction in Board Size due to Miniature Package SOT-23-6. Ultra-Low Quiescent Current at 3μA (Vcc=3.9V). Applications Ultra-Low Power-Down Current at 0.1μA (Vcc=2.0V). Protection IC for One-Cell Lithium-Ion / Lithium-Polymer Battery Pack Precision Overcharge Protection Voltage 4.3V ± 50mV for the DW01 Load Detection Function during Overcharge Mode. Two Detection Levels for Overcurrent Protection. Delay times are generated by internal circuits. No external capacitors required. GUANGDONG HOTTECH INDUSTRIAL CO., LTD Page:P11 - P1 Lithium-ion/Polymer Battery Protection IC Product Name List SOT-23-6 Overcharge detection voltage [VOCP] (V) Overcharge release voltage [VOCR] (V) DW01 4.300±0.050 4.100±0.050 Package Model DW01 Overdischarge Overdischarge detection release voltage voltage [VODP] (V) [VODR] (V) 2.40±0.100 Overcurrent detection voltage [VOI1] (mV) 3.0±0.100 150±30 Pin Configuration 6 Pin No. Symbol 5 4 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 GUANGDONG HOTTECH INDUSTRIAL CO., LTD SOT-23-6 TOP VIEW 1 2 3 Page:P11 - P2 Lithium-ion/Polymer Battery Protection IC TD Functional Block Diagram VCC Short circuit Detector VSS VSS Oscillator Control Circuit Overcharge Detector Over current Detector Overdischarg e Detector VSS Divider Control Logic CS Charger Detector GND VSS OD OC Control Logic VSS Typical Application Circuit BATT+ R1 100Ω VCC C1 0.1μF DW01 Plus GND OC CS OD TD R2 1kΩ M1 M2 BATT- GUANGDONG HOTTECH INDUSTRIAL CO., LTD Page:P11 - P3 Lithium-ion/Polymer Battery Protection IC Absolute Maximum Ratings (VSS=0V, Ta=25°C unless otherwise specified) Item Symbol Rating Unit Input voltage between VDD and VSS * VDD VSS-0.3 to VSS+10 V OC output pin voltage VOC VDD-26 to VDD+0.3 V OD output pin voltage VOD VSS-0.3 to VDD+0.3 V CS input pin voltage VCS VDD-26 to VDD+0.3 V Operating Temperature Range TOP -40 to +85 °C Storage Temperature Range TST -40 to +125 °C Note: DW01 Plus 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. GUANGDONG HOTTECH INDUSTRIAL CO., LTD Page:P11 - P4 Lithium-ion/Polymer Battery Protection IC Electrical Characteristics (Ta=25°C unless otherwise specified) PARAMETER TEST CONDITIONS SYMBOL Supply Current VCC=3.9V ICC Power-Down Current VCC=2.0V IPD Overcharge Protection Voltage DW01 Min Typ Max UNIT 3.0 6.0 μA 0.1 μA 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 VOIP（VOI1） 120 150 180 mV VSIP（VOI2） 1.25 1.35 1.45 V TOC 80 200 ms Short Current Protection Voltage VCC=3.6V Overcharge Delay Time Overdischarge Delay Time VCC=3.6V to 2.0V TOD 20 60 ms Overcurrent Delay Time (1) VCC=3.6V TOI1 10 20 ms Overcurrent Delay Time (2) VCC=3.6V TOI2 5 50 μs -0.7 -0.2 V Charger Detection Threshold Voltage VCH OD Pin Output “H” Voltage VDH OD Pin Output “L” Voltage VDL OC Pin Output “H” Voltage VCH OC Pin Output “L” Voltage VCL GUANGDONG HOTTECH -1.2 VCC-0.1 VCC-0.02 0. 1 V 0.5 VCC-0.1 VCC-0.02 INDUSTRIAL CO., LTD 0.1 V V 0.5 V Page:P11 - P5 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 Plus 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 Plus 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 Plus 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 Plus 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. GUANGDONG HOTTECH INDUSTRIAL CO., LTD Page:P11 - P6 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. GUANGDONG HOTTECH INDUSTRIAL CO., LTD Page:P11 - P7 Lithium-ion/Polymer Battery Protection IC Timing Diagram Overcharge Condition Load Discharging Normal Condition Charger Load Battery Voltage VOCP VOCR VODR VODP OC Pin VCC CS OD Pin VCC GND VCC CS Pin 1. VOI1 GND VCH TOC GUANGDONG HOTTECH TOC INDUSTRIAL CO., LTD Page:P11 - P8 Lithium-ion/Polymer Battery Protection IC Overdischarge Condition Charging by a Charger Normal Condition Charger Load Battery Voltage VOCP VOCR VODR VODP OC Pin VCC CS OD Pin VCC GND CS Pin 2. VCC VOI2 GND VCH TOD GUANGDONG HOTTECH TOD INDUSTRIAL CO., LTD Page:P11 - P9 Lithium-ion/Polymer Battery Protection IC Over Current Condition Normal Condition Charger Load Battery Voltage VOCP VOCR VODR VODP OC Pin VCC CS OD Pin VCC GND CS Pin 3. VCC VOI2 VOI1 GND TOI1 GUANGDONG HOTTECH TOI2 INDUSTRIAL CO., LTD 1age:P11 - P10 Lithium-ion/Polymer Battery Protection IC Package Outline D e1 E1 E c e SYMBOL MIN. TYP. MAX. A A1 1.05 0.05 - 1.35 0.15 A2 b 1.00 0.40 1.10 - 1.20 0.55 b2 c 0.25 0.08 - 0.40 0.20 D E 2.70 2.60 2.90 2.80 3.00 3.00 E1 L 1.50 0.35 1.60 0.45 1.70 0.55 L1 e b2 0.60 REF. 0.95 BSC. e1 θ θ1 θ2 A2 θ1 0 1.90 BSC. 5 10 3 6 5 8 7 10 GAUGE PLANE A1 A Unit : mm DETAIL A b L θ2 θ SEATING PLANE L1 DETAIL A GUANGDONG HOTTECH INDUSTRIAL CO., LTD Page:P11 - P11