View SC8821A_4766562.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

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 (30m) 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 specifiedTamb=25C)
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 s 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 k V V IDD IPD VDD=3.6V VDD=2.0V 3.0 0.3 6.0 0.6 A A 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=250A VG=0V,ID=1A VG=0V,VD=20.6V VG=0V,VD=20V VG=VD,ID=250A 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 A A V m m m
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 VODLHANGZHOU MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2
2009.05.05 Page 3 of 10
SC8821
Release of Overcharge State There are two ways to return to normal state from overcharge state * If the battery is self discharging and VDDVOI1 occurs, it returns to normal state. Overdischarge Detection When enters discharging state from normal state, the battery voltage can be detected from VDD. When the load is connected between VBAT+ and VBAT-, if VDD is smaller than VODL and the delay time is over TOD; then the battery voltage enters overdischarge state, VBAT- current is 0 and stop discharging. At the same time, CSI is pulled to VDD with internal resistor RCSID. If VCSI>VOI2, the protection IC enters into Power-down mode. (Its current consumption is lower than 0.3A). Release of Power-Down State When the battery remains in Power-down state, if a charger is connected between VBAT+ and VBAT-. And VCHVODR occurs, it returns to normal state. Charger Detection If a charger is connected between VBAT+ and VBAT- while the battery remains in Power-down state, and the voltages become VCSIVODL, it returns to normal state. Abnormal Charging Detection If a charger is connected between VBAT+ and VBAT- in normal state, if VCSIHANGZHOU MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2
2009.05.05 Page 4 of 10
SC8821
TIMING DIAGRAM
Overcharge state self discharging normal state
Overcharge stateload dischargingnormal state
HANGZHOU MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2
2009.05.05 Page 5 of 10
SC8821
Overcharge statenormal charging by chargernormal state
Overdischarge stateabnormal charging by chargernormal state
Battery voltage VBAT-
VOCU VOCR VODR VODL
VDD VOI1 VSS VCH
Charger connected Load connected Time delay
TOD
TOC
HANGZHOU MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2
2009.05.05 Page 6 of 10
SC8821
Over current statenormal state
STATE DIAGRAM OF OPERATION
CR
Abnormal charge
VC
SI<
VC
H
Re mo ve
O Overcharge
the c
ha rge r
O >V ge lta vo H ry VC tte I> CS Ba dV An
DR DL
B
e> ag olt yv er att
CU VO
Time TOC delay
VO e< ag olt v I1 ry VO tte I> Ba CS dV An
CU
Normal condition
ry tte Ba
O VCSI> VOI2
VC
SI O >V
Time TOD delay
C dV An SI <
Time TOI2 delay
I1
VC
H
R em e ov
Overdischarge
Time TOI1 delay
lo ad
Char ger c onne cted VCSI> VOI2
e th
Shut down Overcurrent
HANGZHOU MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2
2009.05.05 Page 7 of 10
SC8821
TYPICAL APPLICATION CIRCUITS
VBAT+ R1 100~470 Battery C1 0.1F 1 VSS BATN 6 BATN 7 R2 1K VBAT3 VDD 2 VDD
DRAIN 8
SC8821
TD 5 CSI 4
Note: The circuit and parameters are reference only, please set the parameters of the real application circuit based on the real test.
HANGZHOU MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2
2009.05.05 Page 8 of 10
SC8821
PACKAGE OUTLINE
TSSOP-8-225-0.65 Unit: mm
MOS DEVICES OPERATE NOTES:
Electrostatic charges may exist in many things. Please take following preventive measures to prevent effectively the MOS electric circuit as a result of the damage which is caused by discharge: The operator must put on wrist strap which should be earthed to against electrostatic. Equipment cases should be earthed. All tools used during assembly, including soldering tools and solder baths, must be earthed. MOS devices should be packed in antistatic/conductive containers for transportation.
Disclaimer: * Silan reserves the right to make changes to the information herein for the improvement of the design and performance without further notice! * All semiconductor products malfunction or fail with some probability under special conditions. When using Silan products in system design or complete machine manufacturing, it is the responsibility of the buyer to comply with the safety standards strictly and take essential measures to avoid situations in which a malfunction or failure of such Silan products could cause loss of body injury or damage to property.
*
Silan will supply the best possible product for customers!
HANGZHOU MICROELECTRONICS CO.,LTD
Http: //www.silan.com.cn
REV:1.2
2009.05.05 Page 9 of 10

▲Up To Search▲

Price & Availability of SC8821A

	To Download SC8821A Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .