Silan Semiconductors LI-ION BATTERY SC451 PROTECTOR DESCRIPTION SC451 is a series of lithium ion and lithium polymer rechargeable battery protection ICs with high accurate voltage detection and delay circuits. These ICs are suitable for protection of single cell lithium ion or lithium polymer battery packs from over charge, over discharge, and over current. FEATURES * Low supply current * Overcharge detect * Overcharge release * Overdischarge detect * Overdischarge release * ORDERING INFORMATION Over current 1 detect * Over current 2(Short Current) detect * Overcharge detection delay * Charger detect * Reset resistance for Over current protect * Device Package SC451 SOT-23-6 APPLICATIONS Wide supply voltage range * Small package * Protection IC for One-Cell Lithium-Ion Battery Pack PIN ASSIGNMENT SHENZHEN SUN-SHING SCIENCE&TECHNOLGY CO.,LTD （THE SHENZHEN AGENCY OF SILAN）Tel:0755-26221076 Rev: 1.3 2004.10.13 1 Silan Semiconductors SC451 ABSOLUTE MAXIMUM RATING Characteristic Supply Voltage Between V DD and V SS OC Output Pin Voltage OD Output Pin Voltage CSI Input Pin Voltage Operating Temperature Range Storage Temperature Range Symbol Value Unit V V SS-0.3 to V SS+12 VDD V VDD-15 to VDD+0.3 V OC V V SS-0.3 to V SS+0.3 V OD V CSI TOP TST V VDD-15 to VDD+0.3 -10 ~ + 70 °C -40 ~ +125 °C ELECTRICAL CHARACTERISTICS (Tamb=25°C, unless otherwise specified) Parameter Symbol Conditions Min Typ Max Unit Current consumption Supply Current Power-Down Current IDD VDD=3.9V IPD VDD=2.0V 3.0 0.3 6.0 0.6 µA 8.0 V µA Operating voltage Operating Voltage Between V DD and V SS VDD 1.8 (To be continued) SHENZHEN SUN-SHING SCIENCE&TECHNOLGY CO.,LTD （THE SHENZHEN AGENCY OF SILAN）Tel:0755-26221076 Rev: 1.3 2004.10.13 2 Silan Semiconductors Continued Parameter SC451 Symbol Conditions Min Typ Max Unit Detection voltage Overcharge Detection Voltage Overcharge Release Voltage Overdischarge Detection Voltage Overdischarge Release Voltage Over Current 1 Detection Voltage 4.275 4.325 VOCU VOCR VODL VODR VOI1 Over Current 2 (Short Current) Detection Voltage VOI2 VDD=3.6V Reset Resistance for Over Current Protection Rshort VDD=3.6V Charger Detection Voltage V 4.05 4.15 4.25 V 2.30 2.40 2.50 V 2.90 3.00 3.10 V 0.12 0.15 0.18 V 1.25 1.35 1.45 V 400 -0.8 VCH 4.375 500 -0.6 600 0.4 k~ V Delay time Overcharge Detection Delay Time TOC CTD=0.01uF Overdischarge Detection Delay Time TOD Over Current 1 Detection Delay Time TOI1 VDD=3.6V Over Current 2 (Short Current) Detection Delay Time TOI2 VDD=3.6V VDD=3.6V to 2.0V 50 100 150 ms 5 10 15 ms 5 10 15 ms 5 50 µs Other OC Pin Output “H” Voltage Voh1 OC Pin Output “L”Voltage Vol1 OD Pin Output “H” Voltage Voh2 OD Pin Output “L”Voltage Vol2 V VDD-0.1 VDD-0.02 0.01 0.1 VDD-0.1 VDD-0.02 0.01 0.1 V V V PIN DESCRIPTION PIN No. Symbol 1 OD FET gate connection pin for discharge control 2 CSI Input pin for current sense, charger detect 3 OC FET gate connection pin for charge control 4 TD 5 6 VDD VSS Description Pin for external capacitor setting output delay of V OCU Positive power input pin Negative power input pin SHENZHEN SUN-SHING SCIENCE&TECHNOLGY CO.,LTD （THE SHENZHEN AGENCY OF SILAN）Tel:0755-26221076 Rev: 1.3 2004.10.13 3 Silan Semiconductors SC451 FUNCTIONAL DESCRIPTION Normal Condition If V ODL<VDD<VOCU and V CH<VCSI<VOI1, M1 and M2 are both turned on. The charging and discharging processes can be operated normally. Overcharge Detection If the battery voltage detected from V DD reaches a certain value, charging from a charger is inhibited for overcharge protection. When V DD is larger than V OCU over a delay time of TOC, M2 is to be turned off. Release of Overcharge Condition There are two ways to return to normal condition from overcharge condition. • If the battery is self discharging and VDD<VOCR occurs, M2 is to be turned on and back to normal condition. • Remove the charger and connected to a load. IfV OCR<VDD<V OCU and VCSI>VOI1 occurs, M2 is to be turned on and back to normal condition. Overdischarge Detection If the battery voltage detected from V DD is lower to a certain value, discharge to a load stops. V DD is smaller than V ODL over a delay time of TOD; M1 is to be turned off. In the meanwhile, CSI is pulled to VDD by way of internal resistance, RCSID. If V CSI>VOI2, the protection IC enters into Power-down mode. (Its current consumption is lower than 0.3uA). Release of Power-down mode A charger is connected while the battery remains in Power-down mode. If V CH<VCSI<VOI2 and V DD<VODR occur, M1 is still off but it releases Power-down mode. If VDD>VODR occurs, M1 is to be turned on and back to normal condition. Charger Detection If a charger is connected to the battery remained in Power-down mode, the voltages will become V CSI<VCH and VDD>VODL. M1 is to be turned on and back to normal condition. Abnormal Charging Condition If a charger is connected to the battery in normal condition, V CSI<VCH occurs for a delay time longer than TOC, M2 is to be turned off. SHENZHEN SUN-SHING SCIENCE&TECHNOLGY CO.,LTD （THE SHENZHEN AGENCY OF SILAN）Tel:0755-26221076 Rev: 1.3 4 2004.10.13 Silan Semiconductors SC451 Over Current/Short Current Detection When the discharging current is too large during discharging under normal condition and the voltage detected from CSI is larger than V OIX (VIO1 or VIO2) for over a certain delay time TOIX (TIO1 or TIO2) , it means the over current/short current condition occurred. M1 is turned off. CSI is pulled to V SS by way of an internal resistance, RCSIS. Release of Over Current/Short Current Condition While the protection IC remains in Over Current/Short Current condition and load is removed or the impedance between VBAT+ and VBAT- is larger than 500K~ and VCSI<VOI1, M1 is to be turned on and back to normal condition. Note: when a battery is connected to an IC for the first time, the IC may not enter the normal condition (not dischargeable condition). If this occurs, set the CSI pin voltage equal to the VSS voltage (short the CSI and VSS pins or connect a charger) to enter the normal condition. TIMING DIAGRAM Overcharge condition ~ self discharging ~ normal condition Silan Semiconductors SC451 Overcharge condition~ load discharging~ normal condition Overcharge condition~ charging by charger~ normal condition SHENZHEN SUN-SHING SCIENCE&TECHNOLGY CO.,LTD （THE SHENZHEN AGENCY OF SILAN）Tel:0755-26221076 Rev: 1.3 6 2004.10.13 Silan Semiconductors SC451 Overcharge condition~ abnormal condition~ normal condition Over current condition~ normal condition Rev: 1.3 7 2004.10.13 Silan Semiconductors SC451 TYPICAL APPLICATION CIRCUITS 8 Rev: 1.3 2004.10.13 Silan Semiconductors SC451 PACKAGE OUTLINE SOT-23-6 UNIT: mm HANDLING MOS DEVICES: Electrostatic charges can exist in many things. All of our MOS devices are internally protected against electrostatic discharge but they can be damaged if the following precautions are not taken: • Persons at a work bench should be earthed via a wrist strap. • Equipment cases should be earthed. • All tools used during assembly, including soldering tools and solder baths, must be earthed. • MOS devices should be packed for dispatch in antistatic/conductive containers. SUN-SHING SCIENCE&TECHNOLGY CO.,LTD (SHENZHEN AGENCY OF SILAN）Tel:0755-26221076 Rev: 1.3 9 2004.10.13 Silan Semiconductors SC451 Attachment Revision History Data REV Description Page 2003.05.12 1.0 Original 2003.10.28 1.1 Modify the “ELECTRICAL CHARACTERISTICS” 3 2004.04.20 1.2 Modify the “ELECTRICAL CHARACTERISTICS” 3 2004.10.13 1.3 Modify the “PACKAGE OUTLINE” 9 SUN-SHING SCIENCE&TECHNOLGY CO.,LTD (SHENZHEN AGENCY OF SILAN）Tel:0755-26221076 Rev: 1.3 10 2004.10.13