hi
i found there is a description in the tps51200 datasheet :
The TPS51200 provides S3 support by an EN function. The EN pin could be connected to an SLP_S3 signal in
the end application. Both REFOUT and VO are on when EN = high (S0 state). REFOUT is maintained while VO
is turned off and discharged via an internal discharge MOSFET when EN = low (S3 state). When EN = low and
the REFIN voltage is less than 0.390 V, TPS51200 enters pseudo-S5 state. Both VO and REFOUT outputs are
turned off and discharged to GND through internal MOSFETs when pseudo-S5 support is engaged (S4/S5
state). Figure 1 shows a typical startup and shutdown timing diagram for an application that uses S3 and
pseudo-S5 support.
what is the S3 S5 S5 state mean ???
if we use the tps51200 as VTT DDR3 mode , the EN pin must be connect to SLP_S3 , what is SLP_S3 ???