Datasheet

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ENFALLING
START STOP
ENRISING
ENFALLING
p h
ENRISING
V
V V
V
R1 =
V
I I
V
EN
ip
i
h
VIN
TPS54521
R 1
R 2
PVIN
EN
ip
i
h
PVIN
TPS54521
R 1
R 2
EN
ip
i
h
VIN
TPS54521
R 1
R 2
TPS54521
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SLVS981C JUNE 2010REVISED AUGUST 2013
Figure 17. Adjustable VIN Under Voltage Lock Out
Figure 18. Adjustable PVIN Under Voltage Lock Out, VIN 4.5V
Figure 19. Adjustable VIN and PVIN Under Voltage Lock Out
(2)
(3)
Where I
h
= 3.4 μA, I
p
= 1.15 μA, V
ENRISING
= 1.21 V, V
ENFALLING
= 1.17 V
Adjustable Switching Frequency and Synchronization (RT/CLK)
The RT/CLK pin can be used to set the switching frequency of the device in two modes.
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