TPS22981 Datasheet, PDF (1/27 Pages) Texas Instruments – 3.3V to 18V Thunderbolt Power Mux

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TPS22981
SLVSBM6B – DECEMBER 2012 – REVISED NOVEMBER 2015
TPS22981 3.3-V to 18-V Thunderbolt™ Power Mux
1 Features
•1 Powered from 3.3 V
• 4.5-V to 19.8-V High-Voltage Switch
• 3-V to 3.6-V Switch
• Adjustable Current Limit
• Thermal Shutdown
• Make Before Break Switch
• High-Voltage Discharge Before Low-Voltage Make
• Reverse Current Blocking
2 Applications
• Notebook Computers
• Desktop Computers
• Power Management Systems
Typical Application
connector
DC/DC
ENHVU
S0
V3P3OUT
V3P3
ISET_S0
ISET_S3
Exposed Pad ^ISET_V3P3
VHV
R_{SET_S0}
R_{SET_S3}
R_{SET_V3P3}
V3P3
VHV
DC/DC
µC
3 Description
The TPS22981 device is a current-limited power mux
providing a connection to a peripheral device from
either a low-voltage supply (3 V to 3.6 V) or a high-
voltage supply (4.5 V to 19.8 V). The desired output
is selected by digital control signals.
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.
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.
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.