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TPS22981RGPR Datasheet(PDF) 9 Page - Texas Instruments

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No. de pieza TPS22981RGPR
Descripción Electrónicos  Thunderbolt Power Mux
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
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TPS22981RGPR Datasheet(HTML) 9 Page - Texas Instruments

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R
SET_V3P3
R
SET_S3
R
SET_S0
ISET_S3
ISET_V3P3
ISET_S0
IREF_HV
IREF_V3P3
OUT
VHV
4.5 - 18V
3.3V
Switch
CTRL
Logic
TPS22981
www.ti.com
SLVSBM6B – DECEMBER 2012 – REVISED NOVEMBER 2015
7.3 Feature Description
7.3.1 Current Limit
Figure 1 shows a simplified view of the TPS22981 current limit function. Both the high-voltage supply current limit
and the V3P3 supply current limit are adjustable by external resistors.
Figure 1. Simplified Current Limit Diagram
The current IREF_HV and IREF_V3P3 that set the current limit threshold are set with three external resistors as shown
in Figure 2. When the TPS22981 is passing the V3P3 voltage, the current limit is set by RSET_V3P3. The VHV path
has two modes that allow setting two different current limits. The S0 pin determines which current limit is used.
When S0 is asserted high, RSET_S0 sets the current limit. When S0 is low, RSET_S3 sets the current limit. This
allows the system to have two separate VHV current limits for different modes such as active and sleep.
Figure 2. External RSET Resistance to Set Current Limits
Copyright © 2012–2015, Texas Instruments Incorporated
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