DATASHEET SEARCH SITE | WWW.ALLDATASHEET.COM
Document overview
- Manufacturer or author: Provided By ALLDATASHEET.COM(FREE DATASHEET DOWNLOAD SITE)
- PDF pages: 8
Technical content
Features
Reduction in Board Size due to Miniature Package SOT-23-6. Ultra-Low Quiescent Current at 3 ȝA (Vcc=3.9V). Ultra-Low Pow er-Down Current at 0.1$ (Vcc=2.0V). Precision Overcharge Protection Voltage 4.3V ± 50mV for the .34 Load Detection Function during Overcharge Mode. Two Detection Levels for Overcurrent Protection. Delay times are generated by internal circuits. No external capacitors required.
Ordering Information
.34 PACKAGE TYPE SOT-23-6 TEMPERATURE RANGE -40°C~+85°C OVERCHARGE PROTECTION 4.3V± 50mV AApppplliiccaattiioonnss Protection IC for One-Cell Lithium-Ion / Lithium-Poly mer Battery Pack
www.kexin.com.cn2 IC Lithium-ion/Polymer Battery Protection IC .34 Product NameList Package Model SOT-23-6 Overcharge detection voltage [VOCP] (V) Overcharge release voltage [VOCR] (V) Overdischarge detection voltage [VODP] (V) Overdischarge release voltage [VODR] (V) Overcurrent detection voltage [VOI1] (mV) Pin Configuration 1 2 3 6 4 SOT-23-6 TOP VIEW 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
4T D Test pin for reduce delay time
5 VCC Power supply, through a resistor (R1)
6 GND Ground pin
www.kexin.com.cn 3 IC Lithium-ion/Polymer Battery Protection IC .34 Typical Application Circuit .34 OC OD GND CS BATT- 0 M2 1k VCC BATT+ TD Absolute Maximum Ratings (VSS=0V, Ta=25°C unless otherwise specified) Item Symbol Rating Unit Input voltage between VDD and VSS * V DD VSS-0.3 to VSS+10 V OC output pin voltage V OC VDD-26 to VDD+0.3 V OD output pin voltage V OD VSS-0.3 to VDD+0.3 V CS input pin voltage V CS VDD-26 to VDD+0.3 V Operating Temperature Range T OP -40 to +85 °C Storage Temperature Range T ST -40 to +125 °C Note: .34 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.
www.kexin.com.cn4 IC Lithium-ion/Polymer Battery Protection IC .34 Eletrical Characteristics (Ta=25°C unless otherwise specified) PARAMETER TEST CONDITIONS SYMBOL Min Typ Max UNIT Supply Current V CC=3.9V I CC 3.0 6.0 ȝA Power-Down Current V CC=2.0V I PD 0.1 ȝA Overcharge Protection Voltage .34 V OCP 4.25 4.30 4.35 V Overcharge Release Voltage V OCR 4.05 4.10 4.15 V Overdischarge Protection Voltage V ODP 2.30 2.40 2.50 V Overdischarge Release Voltage V ODR 2.90 3.00 3.10 V Overcurrent Protection Voltage VOIP˄VOI1˅ 120 150 180 mV Short Current Protection Voltage V CC=3.6V VSIP˄VOI2˅ 1.25 1.35 1.45 V Overcharge Delay Time T OC 80 200 ms Overdischarge Delay Time V CC=3.6V to 2.0V T OD 20 60 ms Overcurrent Delay Time (1) V CC=3.6V T OI1 10 20 ms Overcurrent Delay Time (2) V CC=3.6V T OI2 5 50 ȝs Charger Detection Threshold Voltage V CH -1.2 -0.7 -0.2 V OD Pin Output “H” Voltage V DH V CC-0.1 V CC-0.02 V OD Pin Output “L” Voltage V DL 0. 1 0.5 V OC Pin Output “H” Voltage V CH V CC-0.1 V CC-0.02 V OC Pin Output “L” Voltage V CL 0.1 0.5 V
www.kexin.com.cn 5 IC Lithium-ion/Polymer Battery Protection IC .34 Description of Operation 1. Overcharge Protection When the voltage of the battery cell exceeds the overcharge protection voltage (V OCP) 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 lo wer than the overcharge release voltage (VOCR) through self-discharge. 2) The voltage of the battery cell falls be low the overcharge protection voltage (VOCP) and a load is connected. When the battery voltage is above V OCP, 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 (V ODP) 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 beco mes higher than overdischarge release voltage (VODR) through charging. 3. Overcurrent Protection In normal mode, the .34 continuously monitors the discharge current by sensing the voltage of CS pin. If the voltage of CS pin exceeds the overcurrent protection voltage (V OIP) beyond the overcurrent delay time (T OI1) 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 500k . The .34 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 .34 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 (V CH). 5. Power-Down after Overdischarge When overdischarge occurs, the .34 will enter into power-down mode, turning off all the timing generation and detection circuitry to reduce the quiescent current to 0.1ȝA (VCC=2.0V). At the same time, the CS pin is pull-up to VCC through an internal resistor.
www.kexin.com.cn6 IC Lithium-ion/Polymer Battery Protection IC .34 Timing Diagram 1. Overcharge Condition LoadDischarging NormalCondition VOCP VOCR VODR VODP Charger Load VCC CS VCC GND VCC GND Battery Vo ltageOC PinOD PinCS Pin TOC TOC VOI1 VCH
www.kexin.com.cn 7 IC Lithium-ion/Polymer Battery Protection IC .34 2. Overdischarge Condition Charging by a Charger Normal Condition VOCP VOCR VODR VODP Charger Load VCC CS VCC GND VCC GND Battery Vo ltageOC PinOD PinCS Pin TOD TOD VCH VOI2
www.kexin.com.cn8 IC 3. Over Current Condition Normal Condition VOCP VOCR VODR VODP Charger Load VCC CS VCC GND VCC VOI1 Battery VoltageOC PinOD PinCS Pin TOI1 TOI2 GND VOI2 Lithium-ion/Polymer Battery Protection IC .34