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Product details

Parameters

IN1 rDS(on) (Typ) (mOhm) 250 IN2 rDS(on) (Typ) (mOhms) 125 IN1 output current (Max) (A) 3.1 IN2 output current (Max) (A) 3.1 Number of Inputs 2 Rating Catalog Operating temperature range (C) -40 to 85 open-in-new Find other Power muxes

Package | Pins | Size

VQFN (RGP) 20 16 mm² 4 x 4 open-in-new Find other Power muxes

Features

  • 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
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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.

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Technical documentation

= Top documentation for this product selected by TI
No results found. Please clear your search and try again. View all 6
Type Title Date
* Datasheet TPS22981 3.3-V to 18-V Thunderbolt™ Power Mux datasheet (Rev. B) Nov. 25, 2015
Technical articles How to simulate a load switch circuit with varying input voltages and loads Nov. 14, 2016
Technical articles How to protect your server from hot swap events Aug. 08, 2016
Technical articles Simplify digital hot swap design using the PI-Commander GUI Jun. 06, 2016
Technical articles New approach for inrush current clamping with smart high side switch Mar. 26, 2015
User guide TPS22981EVM User’s Guide Nov. 13, 2012

Design & development

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

Hardware development

EVALUATION BOARD Download
49
Description
The Texas Instruments TPS22981EVM evaluation module (EVM) helps designers evaluate the operation and performance of the TPS22981 3.3 V to 18 V MUX with over current limit. The TPS22981 is a current-limited power MUX providing a connection to a peripheral device from either a low voltage supply (3.15 (...)
Features
  • 3.15 V to 3.6 V Low Voltage Switch
  • 5 V to 18 V High Voltage Switch
  • Adjustable Current Limit
  • Thermal Shutdown

Design tools & simulation

SIMULATION MODEL Download
SLVM724.ZIP (9 KB) - IBIS Model
SIMULATION MODEL Download
SLVM727.ZIP (9 KB) - HSpice Model
SIMULATION TOOL Download
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — 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 (...)
Features
  • Leverages Cadence PSpice Technology
  • Preinstalled library with a suite of digital models to enable worst-case timing analysis
  • Dynamic updates ensure you have access to most current device models
  • Optimized for simulation speed without loss of accuracy
  • Supports simultaneous analysis of multiple products
  • (...)

CAD/CAE symbols

Package Pins Download
QFN (RGP) 20 View options

Ordering & quality

Information included:
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  • REACH
  • Device marking
  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
  • Material content
  • Qualification summary
  • Ongoing reliability monitoring

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