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TPS22981

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Thunderbolt™ Host/Peripheral Power Mux (Optimized for Thunderbolt 2)

Product details

Number of input channels 2 IN1 rDS(on) (typ) (mΩ) 250 IN2 rDS(on) (typ) (mΩ) 125 IN1 output current (max) (A) 3.1 IN2 output current (max) (A) 3.1 Rating Catalog Quiescent current (Iq) (µA) 500 Operating temperature range (°C) -40 to 85 FET Internal Imax (A) 0.5 Features Adjustable current limit, Inrush current control, Reverse current blocking, Thermal shutdown Device type Power muxes Function Adjustable current limit, Reverse current blocking, Thermal shutdown
Number of input channels 2 IN1 rDS(on) (typ) (mΩ) 250 IN2 rDS(on) (typ) (mΩ) 125 IN1 output current (max) (A) 3.1 IN2 output current (max) (A) 3.1 Rating Catalog Quiescent current (Iq) (µA) 500 Operating temperature range (°C) -40 to 85 FET Internal Imax (A) 0.5 Features Adjustable current limit, Inrush current control, Reverse current blocking, Thermal shutdown Device type Power muxes Function Adjustable current limit, Reverse current blocking, Thermal shutdown
VQFN (RGP) 20 16 mm² 4 x 4
  • 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
  • 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

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.

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.

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Technical documentation

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Type Title Date
* Data sheet TPS22981 3.3-V to 18-V Thunderbolt™ Power Mux datasheet (Rev. B) PDF | HTML 25 Nov 2015
EVM User's guide TPS22981EVM User’s Guide 13 Nov 2012

Design & development

For additional terms or required resources, click any title below to view the detail page where available.

Simulation model

TPS22981 HSPICE Transient Model

SLVM727.ZIP (9 KB) - HSpice Model
Simulation model

TPS22981 IBIS Model

SLVM724.ZIP (9 KB) - IBIS Model
Simulation tool

PSPICE-FOR-TI — PSpice® for TI design and simulation tool

PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
Package Pins CAD symbols, footprints & 3D models
VQFN (RGP) 20 Ultra Librarian

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