ZHCSI09S June 2010 – August 2018 TPS65911
LDO4 has an optional mode where its output level follows that of VDD1, from 0.6 to 1.5 V, when VDD1 is active. When VDD1 is set to off, the LDO4 output is defined by the SEL[7:2] bits in LDO4_REG, and can be set from 0.8 to 1.5 V.
Tracking mode is enabled by setting TRACK = 1 in DCDCCTRL_REG. In initial activation, VDD1 must be enabled and allowed to settle before enabling tracking mode. After initial activation, tracking mode can be kept enabled while VDD1 is turned off. The value of TRACK is set to default (0) after any turnoff event.