SC121 [SILAN]
LI+ BATTERY PROTECTION CIRCUIT; Li +电池保护电路
| 型号： | SC121 |
| 厂家： | 
SILAN MICROELECTRONICS JOINT-STOCK |
| 描述： | LI+ BATTERY PROTECTION CIRCUIT |
| 文件： | 总9页 (文件大小：611K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SC121
LI+ BATTERY PROTECTION CIRCUIT
DESCRIPTION
SC121 is a LI+ battery protection circuit. It is suitable for protecting LI+
battery against damage from over charge, over discharge, and
current. It contains high accurate voltage detection and delay circuits.
FEATURES
* Low supply current
* Over•charge detect 4.28V, Over•charge release 4.10V.
* Over•discharge detect 2.50V, Over•discharge release 2.90V.
* 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
APPLICATIONS
* Small package
* Protection IC for One•Cell LI+
Battery Pack
ORDERING INFORMATION
Part No.
SC121NTR
Package
Marking
Material
Package Type
Tape & Reel
Tape & Reel
Tape & Reel
Tape & Reel
121N
Pb free
Pb free
SC121NATR
SC121NGTR
SC121NAGTR
121NA
121NG
121NAG
SOT•23•6
Halogen free
Halogen free
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.6
2009.07.20
Page 1 of 9
SC121
BLOCK DIAGRAM
ABSOLUTE MAXIMUM RATING
Characteristics
Supply Voltage
Symbol
VDD
Value
•0.3 ~ V +12
Unit
V
V
SS
SS
OC Output Pin Voltage
OD Output Pin Voltage
CSI Input Pin Voltage
VOC
V
•15 ~ V +0.3
V
DD
DD
VOD
V
SS
•0.3 ~ V +0.3
V
DD
VCSI
V
DD
•15 ~ V +0.3
V
DD
Operating Temperature Range
Storage Temperature Range
TOPR
TSTG
•40 ~ + 85
°C
°C
•40 ~ +125
ELECTRICAL CHARACTERISTICS (Tamb=25°C, unless otherwise specified)
Characteristics
Operating Voltage
Symbol
Status
Min.
Typ.
Max.
Unit
Operating Voltage
VDD
1.8
8.0
V
Current Consumption
Supply Current
IDD
IPD
VDD=3.9V
VDD=2.0V
3.0
0.3
6.0
0.6
mA
mA
Power Down Current
Detection Voltage
Over Charge Detection Voltage
Over Charge Release Voltage
Over Discharge Detection Voltage
Over Discharge Release Voltage
VOCU
VOCR
VODL
VODR
4.24
4.05
2.40
2.80
4.28
4.10
2.50
2.90
4.32
4.15
2.60
3.00
V
V
V
V
HANGZHOU MICROELECTRONICS CO.,LTD
REV:1.6
2009.07.20
Http:// www.silan.com.cn
Page 2 of 9
SC121
Characteristics
Over Current 1 Detection Voltage
Over Current 2(Short Current)Detection
Voltage
Symbol
Status
Min.
Typ.
Max.
Unit
VOI1
0.13
0.15
0.17
V
VOI2
VDD=3.6V
0.80
1.00
1.20
V
Over Current Reset Resistor
Charger Detection Voltage
Delay Time
R
VDD=3.6V
400
•0.8
500
•0.5
600
•0.2
kW
short
VCH
V
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
VDD=3.6V~4.4V
VDD=3.6V~2.0V
VDD=3.6V
150
80
5
340
200
13
500
300
20
ms
ms
ms
TOI2
VDD=3.6V
5
50
ms
Other
OC Pin Output “H” Voltage
OC Pin Output “L” Voltage
OD Pin Output “H” Voltage
Voh1
Vol1
Voh2
Vol2
VDD•0.1 V •0.02
DD
V
V
V
V
0.01
0.1
0.1
VDD•0.1 V •0.02
DD
OD Pin Output “L” Voltage
0 V battery charge starting charger
voltage
0.01
VOCHA
SC121NA
1.55
V
PIN CONFIGURATION
PIN DESCRIPTIONS
PIN No. Symbol
Description
I/O
O
I/O
O
I
1
2
3
4
5
6
OD
CSI
OC
TD
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.
V
DD
Positive power input pin.
I
V
SS
Negative power input pin.
I
HANGZHOU MICROELECTRONICS CO.,LTD
REV:1.6
2009.07.20
Http:// www.silan.com.cn
Page 3 of 9
SC121
FUNCTION DESCRIPTIONS
Normal Status
If VODL<VDD<VOCU and VCH<VCSI<VOI1, M1 and M2 are both turned on (refer to Typical Application Circuits).
The charging and discharging processes can be operated normally.
Overcharge Detection
When enter charging from normal status, the battery voltage can be detected from VDD. When the battery is in
overcharge status, VDD is larger than VOCU over a delay time of TOC, M2 is to be turned off.
Release of Overcharge Status
There are two ways to return to normal status from overcharge status.
· If the battery is self discharging and VDD<VOCR occurs, M2 is to be turned on and back to normal status.
· Remove the charger and connected to a load. If VOCR<VDD<VOCU and VCSI>VOI1 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 DVD. When the battery is
in over discharge status, DVD 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 0.3mA).
Release of Power•down mode
A charger is connected while the battery remains in Power•down mode. If VCH<VCSI<VOI2 and VDD<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 status.
Charger Detection
If a charger is connected to the battery remained in Power•down mode, the voltages will become VCSI<VCH
and VDD>VODL. 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, VCSI<VCH occurs over a delay time longer than TOC,
M2 is to be turned off.
Over Current/Short Current Detection
When the discharging current is too large during discharging under normal status and the voltage detected
from CSI is larger than VOIX (VIO1 or VIO2) for over a certain delay time TOIX (TIO1 or TIO2), it means the over
current/short current status occurred. M1 is turned off. CSI is pulled to VSS by way of an internal resistor RCSIS.
Release of Over Current/Short Current Status
While the protection IC remains in Over Current/Short Current status and load is removed or the impedance
between VBAT+ and VBAT• is larger than 500KW and VCSI<VOI1, M1 is to be turned on and back to normal status.
Note: when a battery is connected to a protection IC for the first time, the IC may not enter the normal status (not
dischargeable status). If this occurs, set the CSI pin voltage equal to the V voltage (short the CSI and
SS
V
SS
pins or connect a charger) to enter the normal status.
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.6
2009.07.20
Page 4 of 9
SC121
TIMING DIAGRAM
Overcharge Status ® Self Discharging ® Normal Status
Charger load
VOCU
VOCR
VODR
VODL
VDD
CSI
VDD
VSS
VDD
VSS
VCH
Self discharging
TOC
Overcharge Status® Load Discharging® Normal Status
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.6
2009.07.20
Page 5 of 9
SC121
Overcharge Status® Charging By Charger® Normal Status
Overcharge Status® Abnormal Status® Normal Status
Charger load
VOCU
VOCR
VODR
VODL
VDD
CSI
VDD
VSS
VDD
VOI2
VSS
VCH
TOC
TOD
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.6
2009.07.20
Page 6 of 9
SC121
Over Current Status® Normal Status
STATE DIAGRAM OF OPERATION
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.6
2009.07.20
Page 7 of 9
SC121
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.
HANGZHOU MICROELECTRONICS CO.,LTD
Http:// www.silan.com.cn
REV:1.6
2009.07.20
Page 8 of 9
SC121
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.
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:1.6
2009.07.20
Page 9 of 9
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