connector

ENHVU

S0

V3P3OUT

V3P3

V3P3

Exposed Pad

ISET_S0

ISET_S3

ISET_V3P3

VHV

VHV

DC/DC

DC/DC

µC

R

SET_S0

R

SET_S3

R

SET_V3P3

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TPS22981

SLVSBM6B – DECEMBER 2012 – REVISED NOVEMBER 2015

TPS22981 3.3-V to 18-V Thunderbolt™ Power Mux

1 Features

3 Description

The TPS22981 device is a current-limited power mux

1

•

Powered from 3.3 V

providing a connection to a peripheral device from

•

4.5-V to 19.8-V High-Voltage Switch

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

•

3-V to 3.6-V Switch

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

is selected by digital control signals.

•

Adjustable Current Limit

•

Thermal Shutdown

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

switch current limits are set with external resistance.

•

Make Before Break Switch

Once the current limit is reached, the TPS22981 will

•

High-Voltage Discharge Before Low-Voltage Make

control the switch to maintain the current at this limit.

•

Reverse Current Blocking

When the high-voltage supply is not present, the

TPS22981 will maintain the connection to the output

2 Applications

from the low-voltage supply. Upon the presence of a

•

Notebook Computers

high-voltage line and high-voltage enable signal, the

high-voltage switch is turned on in conjunction with

•

Desktop Computers

the low-voltage switch until a reverse current is

•

Power Management Systems

detected through the low-voltage switch, allowing a

seamless transition from low voltage to the high-

Typical Application

voltage supply with minimal droop and shoot-through

current.

To prevent current backflow during a switch over from

a VHV connection to a V3P3 connection, the

TPS22981 will break the VHV connection, discharge

the output to approximately 3.3 V and then make the

V3P3 connection. The output may transition to 0 V

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

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

mm VQFN package.

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

TPS22981

VQFN (20)

4.00 mm × 4.00 mm

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

1

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.