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| 型号： | UCC3957M-2 |
| 厂商： | Texas Instruments |
| 文件页数： | 1/15页 |
| 文件大小： | 0K |
| 描述： | IC L-I PROTECTOR CIRCUIT 16-QSOP |
| 标准包装： | 75 |
| 功能： | 过压/欠压保护 |
| 电池化学： | 锂离子（Li-Ion） |
| 电源电压： | 5 V ~ 20 V |
| 工作温度： | -20°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP/QSOP |
| 包装： | 管件 |
| 产品目录页面： | 1022 (CN2011-ZH PDF) |
| 其它名称： | 296-2235-5 |
Not Recommended for New Designs
UCC3957 1, UCC3957 2, UCC3957 3, UCC3957 4
SLUS236B – JANUARY 1999 – REVISED SEPTEMBER 2002
THREE OR FOUR CELL LITHIUM ION
PROTECTOR CIRCUIT
FEATURES
DESCRIPTION
D
D
D
D
D
D
D
D
D
Three- or Four-Cell Operation
Two-Tier Overcurrent Limiting
30- μ A Typical Supply-Current Consumption
3.5- μ A 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
Detection of Loss-of-Cell Sense Connections
M PACKAGE
(TOP VIEW)
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.
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
VDD
CLCNT
WU
AN1
AN2
AN3
AN4
BATLO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
DVDD
AVDD
CDLY 2
DCHG
CHG
AN4
CDLY1
CHGEN
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.
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.
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.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
www.ti.com
Copyright ? 2002, Texas Instruments Incorporated
1
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相关代理商/技术参数 |
参数描述 |
|---|---|
| UCC3957M-2 WAF | 制造商:Texas Instruments 功能描述: |
| UCC3957M-2G4 | 功能描述:电池管理 3-4-Cell Lithium-Ion Protection IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| UCC3957M-3 | 功能描述:电池管理 3-4-Cell Lithium-Ion Protection IC RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| UCC3957M-3 WAF | 制造商:Texas Instruments 功能描述: |
| UCC3957M-3 | 制造商:Texas Instruments 功能描述:IC BATTERY MANAGEMENT BICMOS SSOP 16 |
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