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SC8261G
LI+ BATTERY PROTECTION CIRCUIT
DESCRIPTION
SC8261G is a LI+ battery protection circuit. 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
* Low supply current * Over-charge detect 4.280V, Over-charge release 4.110V. * Over-discharge detect 3.00V, Over-discharge release 3.00V. * Over-current detect 0.15V, Short Current detect 1.00V. * Overcharge/over-discharge/over-current detection delay * Charger detection * Reset resistance for over current protection * Wide supply voltage range * Small package
ORDERING INFORMATION
Device SC8261G Package SOT-23-6 Seal 8261G
APPLICATIONS
* Protection IC for One-Cell LI+ Battery Pack
BLOCK DIAGRAM
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.3
2008.09.01 Page 1 of 10
SC8261G
ABSOLUTE MAXIMUM RATING
Characteristics Supply Voltage OC Output Pin Voltage OD Output Pin Voltage CSI Input Pin Voltage Operating Temperature Range Storage Temperature Range Symbol VDD VOC VOD VCSI TOPR TSTG Value VSS-0.3 ~ VSS+12 VDD-15 ~ VDD+0.3 VSS-0.3 ~ VDD+0.3 VDD-15 ~ VDD+0.3 -40 ~ + 85 -40 ~ +125 Unit V V V V C C
ELECTRICAL CHARACTERISTICS (Tamb=25C, unless otherwise specified)
Characteristics Operating Voltage Operating Voltage Current Consumption Supply Current Power Down 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 2(Short Current)Detection Voltage Over Current Reset Resistor Charger Detection Voltage 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 Other OC Pin Output "H" Voltage OC Pin Output "L" Voltage OD Pin Output "H" Voltage OD Pin Output "L" Voltage Voh1 Vol1 Voh2 Vol2 VDD-0.1 VDD-0.02 0.01 VDD-0.1 VDD-0.02 0.01 0.1 0.1 V V V V 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 s VOCU VOCR VODL VODR VOI1 VOI2 Rshort VCH VDD=3.6V VDD=3.6V 4.255 4.075 2.90 2.90 0.13 0.80 400 -0.8 4.280 4.110 3.00 3.00 0.15 1.00 500 -0.5 4.305 4.145 3.10 3.10 0.17 1.20 600 -0.2 V V V V V V k V IDD IPD VDD=3.9V VDD=2.0V 3.0 0.3 6.0 0.6 A A VDD 1.8 8.0 V Symbol Status Min. Typ. Max. Unit
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.3
2008.09.01 Page 2 of 10
SC8261G
PIN CONFIGURATION
PIN DESCRIPTIONS PIN No. 1 2 3 4 5 6 Symbol OD CSI OC TD VDD VSS I/O O I/O O I I I Description FET gate connection pin for discharge control. Input pin for current sense, charger detect. FET gate connection pin for charge control. Test pin for reduce delay time. Positive power input pin. Negative power input pin.
FUNCTION DESCRIPTIONS
Normal Status If VODLVOI1 occurs, M2 is to be turned on and back to normal status. Over discharge Detection When enter discharging from normal status, the battery voltage can be detected from VDD. When the battery is in over discharge status, VDD is smaller than VODL over a delay time of TOD; M1 is to be turned off. In the meanwhile, CSI is pulled to VDD by way of internal resistor RCSID. If VCSI>VOI2, the protection IC enters into Power-down mode. (Its current consumption is lower than 0.3A).
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.3
2008.09.01 Page 3 of 10
SC8261G
Release of Power-down mode A charger is connected while the battery remains in Power-down mode. If VCHVODR occurs, M1 is to be turned on and back to normal status. Charger Detection If a charger is connected to the battery remained in Power-down mode, the voltages will become VCSIVODL. M1 is to be turned on and back to normal status. Abnormal Charging Status If a charger is connected to the battery in normal status, VCSIHANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.3
2008.09.01 Page 4 of 10
SC8261G
TIMING DIAGRAM
Overcharge Status Self Discharging Normal Status
Overcharge StatusLoad DischargingNormal Status
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.3
2008.09.01 Page 5 of 10
SC8261G
Overcharge StatusCharging By ChargerNormal Status
Overcharge StatusAbnormal StatusNormal Status
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
CSI pin
OD pin
OC pin
Battery voltage
REV:1.3
2008.09.01 Page 6 of 10
SC8261G
Over Current StatusNormal Status
STATE DIAGRAM OF OPERATION
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.3
2008.09.01 Page 7 of 10
SC8261G
TYPICAL APPLICATION CIRCUITS
Note: The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test.
PACKAGE OUTLINE
SOT-23-6 UNIT: mm
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.3
2008.09.01 Page 8 of 10
SC8261G
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.
NoteSilan reserves the right to make changes without notice in this specification for the improvement of the design and performance. Silan will supply the best possible product for customers.
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.3
2008.09.01 Page 9 of 10

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