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UCC3957M-2TR

更新时间： 2024-11-26 23:39:07
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其他 - ETC 模拟IC光电二极管过电流保护信息通信管理
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12页 168K
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Analog IC

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UCC3957M-2TR 数据手册

 浏览型号UCC3957M-2TR的Datasheet PDF文件第2页浏览型号UCC3957M-2TR的Datasheet PDF文件第3页浏览型号UCC3957M-2TR的Datasheet PDF文件第4页浏览型号UCC3957M-2TR的Datasheet PDF文件第5页浏览型号UCC3957M-2TR的Datasheet PDF文件第6页浏览型号UCC3957M-2TR的Datasheet PDF文件第7页 
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SLUS236A – JANUARY 1999 – REVISED JUNE 2001  
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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  
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  
overcharge  
and  
overdischarge.  
A
separate  
Highly Accurate Internal Voltage Reference  
overcurrent-protection block protects the battery pack  
from excessive discharge currents.  
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  
1
2
3
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16  
15  
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12  
11  
AN1  
AN2  
AN3  
AN4  
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  
AN4  
10 CDLY1  
CHGEN  
BATLO  
9
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.  
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 2001, Texas Instruments Incorporated  
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