SC8821

SC8821 ONE-CELL LI+ BATTERY PROTECTION CIRCUIT WITH BUILT-IN MOSFET DESCRIPTION SC8821 is a Li+ battery protection circuit with built-in MOSFET. It is suitable for protecting LI+ battery against damage from over charge, over discharge, and over current. It contains high accurate voltage detection and delay circuits. FEATURES * Built-in low equivalent on-resistance (30mΩ) N-type MOSFET * Low supply current * Overcharge detection 4.28V, overcharge release 4.10V * Overdischarge detection 2.50V, overchdisarge release 2.90V TSSOP-8-225-0.65 * Over current detection 0.15V and short current detection 1.00V * Built-in detection time delay of overcharge, overdischarge and APPLICATIONS overcurrent * Charger detection * Reset resistance for over current protection * Wide supply voltage range * Protection IC for One-Cell Li+ Battery ORDERING INFORMATION Part No. SC8821 SC8821A Package TSSOP-8-225-0.65 TSSOP-8-225-0.65 0V Charging Forbid Allow Marking 8821 8821A BLOCK DIAGRAM HANGZHOU MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.2 2009.05.05 Page 1 of 10 SC8821 ABSOLUTE MAXIMUM RATING Characteristics Supply Voltage CSI Pin Voltage BATN Pin Voltage Operating Temperature Storage Temperature Symbol VDD VCSI VBN Topr Tstg Value VSS-0.3 ~ VSS+12 VDD-15 ~ VDD+0.3 VDD-15 ~ VDD+0.3 -40 ~ + 85 -40 ~ +125 Unit V V V °C °C ELECTRICAL CHARACTERISTICS (unless otherwise specified，Tamb=25°C) Characteristics Operating Voltage Operating Voltage Current Consumption Supply Current Standby Current Detection Voltage Over Charge Detection Voltage Over Charge Release Voltage Over Discharge Detection Voltage Over Discharge Release Voltage Over Current 1 Detection Voltage Over Current 1 Detection Current Over Current 2(Short Current) Detection Voltage Over Current Reset Resistor Charger Detection Voltage Battery voltage when 0V charging is forbidden Charger voltage when 0V charging is allowed Delay Time Over Charge Detection Delay Time Over Discharge Detection Delay Time Over Current 1 Detection Delay Time Over Current 2(Short Current) Detection Delay Time TOC TOD TOI1 TOI2 VDD=3.6V~4.4V VDD=3.6V~2.0V VDD=3.6V VDD=3.6V 150 80 5 340 200 13 5 500 300 20 50 ms ms ms μs VOCU VOCR VODL VODR VOI1 IOI1 VOI2 Rshort VCH VINH Product SC8821 VDD=3.6V VDD=3.6V VDD=3.6V 4.24 4.05 2.40 2.80 0.13 1 0.80 400 -0.8 4.28 4.10 2.50 2.90 0.15 2 1.00 500 -0.5 4.32 4.15 2.60 3.00 0.17 3 1.20 600 -0.2 1.5 V V V V V A V kΩ V V IDD IPD VDD=3.6V VDD=2.0V 3.0 0.3 6.0 0.6 μA μA VDD 1.8 8.0 V Symbol Conditions Min. Typ. Max. Unit VCHA Product SC8821A 1.55 V HANGZHOU MICROELECTRONICS CO.,LTD Http: //www.silan.com.cn REV:1.2 2009.05.05 Page 2 of 10 SC8821 Characteristics Symbol Conditions Min. Typ. Max. Unit Low equivalent on-resistance N-type MOSFET Drain-Source Breakdown Voltage Drain-Source Breakdown Current Threshold Voltage BVDSS IDSS VTH VG=0V,ID=250μA VG=0V,ID=1μA VG=0V,VD=20.6V VG=0V,VD=20V VG=VD,ID=250μA VG=2.5V, ID=3A Source-Drain On-Resistance RDSON VG=4.5V, ID=1A VG=4.5V, ID=3A 0.62 20.6 20 250 1 1.455 39.6 30 27.7 V V μA μA V mΩ mΩ mΩ PIN CONFIGURATION SC8821 PIN DESCRIPTIONS PIN No. 1 2, 3 4 5 6, 7 8 Symbol VSS VDD CSI TD BATN DRAIN I/O I I I/O I I/O I/O Negative power input pin Positive power input pin Current detection input Time delay testing terminal Negative terminal of charger or load The common drain of the two N-type MOSFET Description FUNCTION DESCRIPTIONS Normal State Refer to the typical application circuit. If VODL