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UCC3957M-1G4

更新时间： 2024-09-20 12:16:55
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德州仪器 - TI 电池
页数 文件大小 规格书
15页 296K
描述
THREE-OR FOUR-CELL LITHIUM-ION PROTECTOR CIRCUIT

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中文翻译

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UCC3957M-1G4 数据手册

 浏览型号UCC3957M-1G4的Datasheet PDF文件第2页浏览型号UCC3957M-1G4的Datasheet PDF文件第3页浏览型号UCC3957M-1G4的Datasheet PDF文件第4页浏览型号UCC3957M-1G4的Datasheet PDF文件第5页浏览型号UCC3957M-1G4的Datasheet PDF文件第6页浏览型号UCC3957M-1G4的Datasheet PDF文件第7页 
Not Recommended for New Designs  
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SLUS236B – JANUARY 1999 – REVISED SEPTEMBER 2002  
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FEATURES  
DESCRIPTION  
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Three- or Four-Cell Operation  
Two-Tier Overcurrent Limiting  
The UCC3957 is a BiCMOS three- or four-cell  
lithium-ion battery pack protector designed to  
operate with external P-channel MOSFETs.  
Utilizing external P-channel MOSFETs provides  
the benefits of no loss-of-system ground in an  
overdischarge state, and protects the IC as well as  
battery cells from damage during an overcharge  
state. An internal state machine runs continuously  
to protect each lithium-ion cell from overcharge  
and overdischarge. A separate overcurrent-  
protection block protects the battery pack from  
excessive discharge currents.  
30-µA Typical Supply-Current Consumption  
3.5-µA Typical Supply Current in Sleep Mode  
Smart Discharge Minimizes Losses in  
Overcharge Mode  
6.5-V to 20-V VDD Supply Range  
Highly Accurate Internal Voltage Reference  
Externally Adjustable Delays in Overcurrent  
Controller  
If any cell voltage exceeds the overvoltage  
threshold, the appropriate external P-channel  
MOSFET is turned off, preventing further charge  
current. An external N-channel MOSFET is  
required to level shift to this high-side P-channel  
MOSFET. Discharge current can still flow through  
the second P-channel MOSFET. Likewise, if any  
cell voltage falls below the undervoltage limit, the  
second P-channel MOSFET is turned off and only  
charge current is allowed. Such a cell-voltage  
condition causes the chip to go into low-power  
sleep mode. Attempting to charge the battery  
pack wakes up the chip. A cell-count pin (CLCNT)  
is provided to program the IC for three- or four-cell  
operations.  
D
Detection of Loss-of-Cell Sense Connections  
M PACKAGE  
(TOP VIEW)  
VDD  
CLCNT  
WU  
DVDD  
AVDD  
CDLY2  
DCHG  
CHG  
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16  
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12  
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AN1  
AN2  
A two-tiered overcurrent controller and external  
current shunt protect the battery pack from  
excessive discharge currents. If the first  
overcurrent threshold level is exceeded, an  
internal timing circuit charges an external  
capacitor to provide a user programmable  
blanking time. If at the end of the blanking time the  
overcurrent condition still exists, the external  
discharge FET is turned off for a period 17 times  
longer than the first blanking period, and then the  
discharge FET is turned back on. If at any time a  
second higher overcurrent threshold is exceeded  
for more than a user programmable time, the  
discharge FET is turned off, and remains off for the  
same period as the first tier off time. This two tiered  
overcurrent-protection scheme allows for  
charging capacitive loads while retaining effective  
short-circuit protection.  
AN3  
AN4  
AN4  
10 CDLY1  
CHGEN  
BATLO  
9
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments  
semiconductor products and disclaimers thereto appears at the end of this data sheet.  
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Copyright 2002, Texas Instruments Incorporated  
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中文翻译

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UCC3957M-1G4 替代型号

型号 品牌 替代类型 描述 数据表
UCC3957M-2 TI

完全替代

 THREE-OR FOUR-CELL LITHIUM-ION PROTECTOR CIRCUIT
UCC3957M-3 TI

类似代替

 THREE-OR FOUR-CELL LITHIUM-ION PROTECTOR CIRCUIT
UCC3957M-4 TI

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 THREE-OR FOUR-CELL LITHIUM-ION PROTECTOR CIRCUIT

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