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TPS22981RGPR Datasheet(PDF) 10 Page - Texas Instruments

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Part # TPS22981RGPR
Description  Thunderbolt Power Mux
PDF  27 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

TPS22981RGPR Datasheet(HTML) 10 Page - Texas Instruments

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LIMMAX
SET
41571
I
+ 0.0161 A
R
=
LIMMIN
SET
38429
I
– 0.0161 A
R
=
SET
LIMTYP
40 k
Amps
R
I
W ´
=
-25%
-20%
15%
10%
-5%
0%
5%
10%
15%
20%
25%
0
50
100
150
200
250
300
350
400
450
RSET_S0/S3/V3P3 (k )
min
typ
max
0
200
400
600
800
1000
1200
1400
1600
1800
0
50
100
150
200
250
300
350
400
450
RSET_S0/S3/V3P3 (k )
min
typ
max
TPS22981
SLVSBM6B – DECEMBER 2012 – REVISED NOVEMBER 2015
www.ti.com
Feature Description (continued)
7.3.2 Current Limit Threshold
Figure 3. ILIM vs RSET for VHV and V3P3
Figure 4. % Variance from Minimum ILIM vs RSET
Figure 3 shows the minimum, typical, and maximum current limit for either supply versus its corresponding RSET
value. Equation 1 is used to determine the RSET needed to set a typical ILIM for a given supply and mode.
Figure 4 shows the percent variation from the typical ILIM value to the minimum and maximum ILIM values.
SPACE
where
•
RSET = external resistor used to set the current limit for V3P3, VHV (S0), or VHV (S3)
•
ILIMTYP = typical current limit for V3P3, VHV (S0), or VHV (S3) set by the external RSET resistor.
(1)
SPACE
Each resistor is placed between the corresponding ISET pin and GND, as shown in Figure 2, providing a
minimum current limit between 100mA and 1.5A. For a given RSET the minimum current limit and the maximum
current limit are determined by Equation 2 and Equation 3.
SPACE
(2)
SPACE
(3)
SPACE
7.3.3 Maximum Current Limit Threshold
The TPS22981 has a maximum current limit ILIMVHVMAX and ILIM3P3MAX. This prevents excessive current in the
case of an ISET pin being shorted to ground.
7.3.4 Transition Delays
Output transitions of the TPS22981 voltages are shown in Figure 5. When the device transitions from VHV to V3P3
at the output, the power switches both turn off until the output falls to near the V3P3 voltage. During this time, a
discharge current of IDIS pulls OUT down. If a load is also pulling current from OUT, the output will drop to near 0
V due to the switch OFF-time of T3P3OFF.
10
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Product Folder Links: TPS22981



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