Datasheet

EN
TPS54060A
3
SS/TR
4
PWRGD
6
EN
TPS54060A
3
SS/TR4
PWRGD6
EN1,EN2
VOUT1
VOUT2
EN1
PWRGD1
VOUT1
VOUT2
SS /TR
TPS54060A
EN
PWRGD
SS /TR
EN
PWRGD
TPS54060A
SLVSB57B –MARCH 2012–REVISED SEPTEMBER 2013 www.ti.com
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 TPS54060A devices. The power good is
coupled to the EN pin on the TPS54060A which will enable 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 will provide a
1ms 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
Sequence SS/TR pins
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