TPS22981

更新时间： 2024-11-14 12:25:11

品牌	Logo	应用领域
德州仪器 - TI		复用器
页数	文件大小	规格书
19页	432K
描述
3.3V to 18V Thunderbolt Power Mux

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中文翻译

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TPS22981 数据手册

TPS22981

www.ti.com

SLVSBM6 –DECEMBER 2012

3.3V to 18V Thunderbolt Power Mux

Check for Samples: TPS22981

FEATURES

DESCRIPTION

The TPS22981 is

providing a connection to a peripheral device from

either a low voltage supply (3V to 3.6V) or a high

voltage supply (4.5V to 19.8V). The desired output is

selected by digital control signals.

•

Powered from 3.3V

current-limited power mux

4.5V to 19.8V High Voltage Switch

3V to 3.6V Switch

Adjustable Current Limit

Thermal Shutdown

The high voltage (VHV) and low voltage (V3P3)

switch current limits are set with external resistance.

Once the current limit is reached, the TPS22981 will

control the switch to maintain the current at this limit.

Make Before Break Switch

High Voltage Discharge Before Low Voltage

Make

•

Reverse Current Blocking

When the high voltage supply is not present, the

TPS22981 will maintain the connection to the output

from the low voltage supply. Upon the presence of a

high voltage line and high voltage enable signal, the

high voltage switch is turned on in conjunction with

the low voltage switch until a reverse current is

detected through the low voltage switch, allowing a

seamless transition from low voltage to the high

voltage supply with minimal droop and shoot-through

current.

APPLICATIONS

•

Notebook Computers

Desktop Computers

Power Management Systems

connector

To prevent current backflow during a switch over from

VHV connection to a V3P3 connection, the

TPS22981 will break the VHV connection, discharge

the output to approximately 3.3V and then make the

V3P3 connection. The output will transition to 0V

when a load is present, before returning to 3.3V.

R_{SET_S0}

R_{SET_S3}

R_{SET_V3P3}

ISET_S0

ISET_S3

ENHVU

V3P3OUT

V3P3

ISET_V3P3

VHV

The TPS22981 is available in a 4mm x 4mm x 1mm

QFN package.

Exposed Pad

DC/DC

V3P3

VHV

DC/DC

µC

Figure 1. Typical Application

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 the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.

12 3 4 5 6 7...19

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