Datasheet

STAT
D0
D1
ILIM
IN1
OUT
IN2
GND
1
2
3
4
8
7
6
5
TPS2115APW
0.1 mF
C2
0.1 mF
C
L
R
L
IN1:2.8 5.5- V
IN2:2.8 5.5- V
R
ILIM
NC
SwitchStatus
R1
STAT
D0
D1
ILIM
IN1
OUT
IN2
GND
1
2
3
4
8
7
6
5
TPS2115APW
0.1 mF
0.1 mF
C
L
R
L
IN1:2.8 5.5- V
IN2:2.8 5.5- V
R
ILIM
SwitchStatus
R1
TPS2114A
TPS2115A
SBVS044F –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 TPS2114A/5A will select the higher of the two supplies. This usually
means that the TPS2114A/5A 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 D1 logic signal. OUT connects
to IN1 if D1 is logic 1; otherwise, OUT connects to IN2. The logic thresholds for the D1 terminal are compatible
with both TTL and CMOS logic.
Figure 15. Manually Switching Power Sources
16 Copyright © 2004–2012, Texas Instruments Incorporated