Datasheet

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V =1.5V
O
V =3.3V
I
R
8.87k
SET
W
ASIC
VCORE
VCCIO
I
O
PTV03010W
Track
V
I
V
O
GNDGND
Vadj
+
C
I
+
C
O
+
PTV03010W
SLTS241A – FEBRUARY 2005 – REVISED JULY 2007
NOTES:
1. The prebias start-up feature is not compatible with Auto-Track. If the rise in the output is limited by the
voltage applied to the Track control pin, the output sinks current during the period that the track control
voltage is below that of the back-feeding source. For this reason, Auto-Track should be disabled when not
being used. This is accomplished by connecting the Track pin to the input voltage, V
I
. This raises the
Track pin well above the set-point voltage prior to start-up, which defeats the Auto-Track feature.
2. To further ensure that the regulator output does not sink current when power is first applied (even with a
ground signal applied to the Inhibit control input), the input voltage must always be greater than the
applied prebias source. This condition must exist throughout the power-up sequence of the power
system.
Figure 16. Application Circuit Demonstrating Prebias Start-Up
16
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