ZHCSHB7B September 2017 – July 2018 TPS7A53-Q1
PRODUCTION DATA.
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 41 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 |