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TPS22980

更新时间： 2024-11-14 12:21:59
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德州仪器 - TI /
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描述
3.3V TO 18V MUX with Overcurrent Limit

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TPS22980 数据手册

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TPS22980  
www.ti.com  
SLVSB61B –DECEMBER 2011–REVISED APRIL 2012  
3.3V TO 18V MUX with Overcurrent Limit  
Check for Samples: TPS22980  
1
FEATURES  
APPLICATIONS  
•
•
•
•
•
•
•
Powered From 3.3V  
•
•
•
Notebook Computers  
Desktop Computers  
4.5V to 19.8V High Voltage Switch  
3V to 3.6V Switch  
Power Management Systems  
Adjustable Current Limit  
Thermal Shutdown  
Make Before Break Switch  
High Voltage Discharge Before Low Voltage  
Make  
•
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.  
RSVD  
Figure 1. Typical Application  
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of  
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.  
 
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