SBVS297B November 2019 – May 2020 TPS7A53
Controlling when a single power supply turns on can be difficult in a power distribution network (PDN) because of the high power levels inherent in a PDN, and the variations between all of the supplies. As shown in Figure 42 and Table 2, the LDO turnon and turnoff time is set by the enable circuit (EN) and undervoltage lockout circuits (UVLO1,2(IN) and UVLOBIAS).
|INPUT VOLTAGE||BIAS VOLTAGE||ENABLE STATUS||LDO STATUS||ACTIVE DISCHARGE||POWER GOOD|
|VIN ≥ VUVLO_1,2(IN)||VBIAS ≥ VUVLO(BIAS)||EN = 1||On||Off||PG = 1 when VOUT ≥ VIT(PG)|
|EN = 0||Off||On||PG = 0|
|VBIAS < VUVLO(BIAS) + VHYS(BIAS)||EN = don't care||Off||On(1)|
|VIN < VUVLO_1,2(IN) – VHYS1,2(IN)||BIAS = don't care||Off|
|IN = don't care||VBIAS ≥ VUVLO(BIAS)||Off|