Datasheet

EN
TPS54160
3
SS/TR
4
PWRGD
6
EN
TPS54160
3
SS/TR4
PWRGD
6
EN1,EN2
VOUT1
VOUT2
EN1
PWRGD1
VOUT1
VOUT2
SS /TR
TPS54160
EN
PWRGD
SS /TR
EN
PWRGD
TPS54160
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SLVS795E OCTOBER 2008REVISED SEPTEMBER 2013
DETAILED DESCRIPTION (continued)
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 32 using two TPS54160 devices. The power good is
coupled to the EN pin on the TPS54160 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 33 shows the results of Figure 32.
Figure 32. Schematic for Sequential Start-Up Figure 33. Sequential Startup using EN and
Sequence PWRGD
Figure 34. Schematic for Ratiometric Start-Up Figure 35. Ratio-Metric Startup using Coupled
Using Coupled SS/TR Pins SS/TR pins
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