TPS51200
www.ti.com
SLUS812–FEBRUARY 2008
3.3VIN
V
= 1.5 V
0.390 V
VDDQ
0.370 V
VLDOIN
REFIN
REFOUT
(VTTREF)
EN
(S3_SLP)
V
= 0.75 V
Tss
VO
VO
C
x V
O
O
T
=
SS
I
OOCL
PGOOD
2 ms
UDG-08021
Figure 1. Typical Timing Diagram for S3 and pseudo-S5 Support
3.3VIN
EN
VLDOIN
REFIN
REFOUT
(VTTREF)
t
determined
SS
by the SS time
of VLDOIN
V
= 0.75 V
VO
VO
PGOOD
UDG-08020
2ms
Figure 2. Typical Timing Diagram of Tracking Startup and Shutdown
10
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