TPS22980 Datasheet, PDF (1/18 Pages) Texas Instruments – 3.3V TO 18V MUX with Overcurrent Limit

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TPS22980
SLVSB61B – DECEMBER 2011 – REVISED APRIL 2012
3.3V TO 18V MUX with Overcurrent Limit
Check for Samples: TPS22980
FEATURES
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• Powered From 3.3V
• 4.5V to 19.8V High Voltage Switch
• 3V to 3.6V Switch
• Adjustable Current Limit
• Thermal Shutdown
• Make Before Break Switch
• High Voltage Discharge Before Low Voltage
Make
• Reverse Current Blocking
APPLICATIONS
• Notebook Computers
• Desktop Computers
• Power Management Systems
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.
RSVD
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.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2011–2012, Texas Instruments Incorporated