RSVD

TPS22980

www.ti.com

SLVSB61B – DECEMBER 2011 – REVISED APRIL 2012

3.3V TO 18V MUX with Overcurrent Limit

Check for Samples: TPS22980

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FEATURES

APPLICATIONS

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Powered From 3.3V

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Notebook Computers

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4.5V to 19.8V High Voltage Switch

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Desktop Computers

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3V to 3.6V Switch

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Power Management Systems

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Adjustable Current Limit

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Thermal Shutdown

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Make Before Break Switch

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High Voltage Discharge Before Low Voltage

Make

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Reverse Current Blocking

DESCRIPTION

The TPS22980 is a current-limited power mux providing a connection to a peripheral device from either a low

voltage supply (3.0V up to 3.6V) or a high voltage supply (5V up to 18V). 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 TPS22980 will control the switch to maintain the current at the limit.

When the high voltage supply is not present, the TPS22980 will maintain the connection to the output from the

low voltage supply. When a high voltage line and high voltage enable signal is detected by the device, the high

voltage switch will be turned on in conjunction with the low voltage switch until a reverse current is detected by

the low voltage switch. The low voltage switch is then disabled allowing a seamless transition from a low voltage

to a high voltage supply with minimal drop and shoot-through current.

To prevent current backflow during a transition from a VHV connection to a V3P3 connection, the TPS22980 will

break the VHV connection and discharge the output to approximately 3.3V. Once the output reaches 3.3V the

device will connect V3P3 switch. If a load is present, the output will transition to 0V before returning to 3.3V.

The TPS22980 is available in a 4mm x 4mm x 1mm QFN package.

Figure 1. Typical Application

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Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2011–2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.