Datasheet > UCC3957

UCC3957

更新时间： 2024-11-27 04:27:03

品牌	Logo	应用领域
德州仪器 - TI		电池
页数	文件大小	规格书
8页	119K
描述
Three - Four Cell Lithium-Ion Protector Circuit

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UCC3957 数据手册

UCC3957 -1/-2/-3/-4

PRELIMINARY

Three - Four Cell Lithium-Ion Protector Circuit

FEATURES

DESCRIPTION

• Three or Four Cell Operation

The UCC3957 is a BiCMOS three or four cell lithium-ion battery pack

protector designed to operate with external P-channel MOSFETs. Uti-

lizing 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 over-

charge and overdischarge. A separate overcurrent protection block pro-

tects the battery pack from excessive discharge currents.

• Two Tier Overcurrent Limiting

• 30µA Typical Supply Current

Consumption

• 3.5µA Typical Supply Current in Sleep

Mode

• Smart Discharge Minimizes Losses in

Overcharge Mode

If any cell voltage exceeds the overvoltage threshold, the appropriate ex-

ternal P-channel MOSFET is turned off, preventing further charge cur-

rent. 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 PFET. Likewise, if any cell voltage falls below the undervoltage

limit, the second P-channel MOSFET is turned off and only charge cur-

rent is allowed. Such a cell voltage condition will cause the chip to go

into low power sleep mode. Attempting to charge the battery pack will

wake up the chip. A cell count pin (CLCNT) is provided to program the IC

for three or four cell operations.

• 6.5V to 20V VDD Supply Range

• Highly Accurate Internal Voltage

Reference

• Externally Adjustable Delays in

Overcurrent Controller

• Detection of Loss of Cell Sense

Connections

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.

(continued)

BLOCK DIAGRAM

UDG-97060

SLUS236 - JANUARY 1999

12 3 4 5 6 7 8

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与UCC3957相关器件

型号	品牌	获取价格	描述	数据表
UCC3957-1	TI	获取价格	Three - Four Cell Lithium-Ion Protector Circuit
UCC3957-1M	TI	获取价格	4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, 0.150 INCH, 0.635 MM PITCH, SSOP-16
UCC3957-2	TI	获取价格	Three - Four Cell Lithium-Ion Protector Circuit
UCC3957-3	TI	获取价格	Three - Four Cell Lithium-Ion Protector Circuit
UCC3957-3M	TI	获取价格	暂无描述
UCC3957-4	TI	获取价格	Three - Four Cell Lithium-Ion Protector Circuit
UCC3957-4M	TI	获取价格	4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, 0.150 INCH, 0.635 MM PITCH, SSOP-16
UCC3957M	TI	获取价格	4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16, 0.150 INCH, SSOP-16
UCC3957M-1	TI	获取价格	THREE-OR FOUR-CELL LITHIUM-ION PROTECTOR CIRCUIT
UCC3957M-1G4	TI	获取价格	THREE-OR FOUR-CELL LITHIUM-ION PROTECTOR CIRCUIT