Datasheet

TPS2113A
STAT
EN
VSNS
ILIM
IN1
OUT
IN2
GND
8
7
6
5
1
2
3
4
R
ILIM
0.1 Fm
0.1 Fm
IN2:2.8Vto5.5V
IN1:2.8Vto5.5V
R
2
R
1
R
3
Switch
Status
R
L
C
L
TPS2113A
STAT
EN
VSNS
ILIM
IN1
OUT
IN2
GND
8
7
6
5
1
2
3
4
R
L
R
ILIM
C
L
0.1 Fm
0.1 Fm
IN2:2.8Vto5.5V
IN1:2.8Vto5.5V
R
1
Switch
Status
TPS2112A
TPS2113A
SBVS045C –MARCH 2004–REVISED MAY 2012 www.ti.com
APPLICATION INFORMATION
Some applications have two energy sources, one of which should be used in preference to another. Figure 14
shows a circuit that will connect IN1 to OUT until the voltage at IN1 falls below a user-specified value. Once the
voltage on IN1 falls below this value, the TPS2112A/3A will select the higher of the two supplies. This usually
means that the TPS2112A/3A will swap to IN2.
Figure 14. Auto-Selecting for a Dual Power-Supply Application
In Figure 15, the multiplexer selects between two power supplies based upon the VSNS logic signal. OUT
connects to IN1 if VSNS is logic '1'; otherwise, OUT connects to IN2 if V
IN2
is greater than V
IN1
. The logic
thresholds for the VSNS terminal are compatible with both TTL and CMOS logic.
Figure 15. Manually Switching Power Sources
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