Datasheet

EN1
PWRGD1
VOUT1
VOUT2
SS /TR
TPS54160A
EN
PWRGD
SS /TR
EN
PWRGD
TPS54160 , TPS54160A
www.ti.com SLVSB56C –MAY 2012–REVISED FEBRUARY 2014
Feature Description (continued)
8.3.12 Sequencing
Many of the common power supply sequencing methods can be implemented using the SS/TR, EN and PWRGD
pins. The sequential method can be implemented using an open drain output of a power on reset pin of another
device. The sequential method is illustrated in Figure 33 using two TPS54160A devices. The power good is
coupled to the EN pin on the TPS54160A which enables the second power supply once the primary supply
reaches regulation. If needed, a 1nF ceramic capacitor on the EN pin of the second power supply provides a 1-
ms start-up delay. Figure 34 shows the results of Figure 33.
Figure 33. Schematic for Sequential Start-Up Figure 34. Sequential Startup using EN and
Sequence PWRGD
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