TC1303B-AO2EMF datasheet(17/30 Pages) MICROCHIP

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DS21949A-page 17

TC1303B

4.4

Power-Good

A power-good (PG) output signal is generated based

off of the LDO output voltage (VOUT2). A fixed delay

time of approximately 300 ms is generated once the

LDO output voltage is above the power-good threshold

(typically 94% of VOUT2). As VOUT2 falls out of regula-

tion, the falling PG threshold is typically 92% of VOUT2.

The PG output signal is pulled up to VOUT2 indicating

that power is good and pulled low indicating that VOUT2

is out of regulation. The typical quiescent current draw

for power-good circuitry is less than 10 µA.

If the LDO output voltage falls below the power-good

threshold, the power-good output will transition to the

low state. The power-good circuitry has a 165 µs delay

when detecting a falling output voltage. This helps to

increase the noise immunity of the power-good output

and avoiding false triggering of the PG signal during

line and load transients.

FIGURE 4-1:

Power-Good Timing.

4.5

Soft Start

Both outputs of the TC1303B are controlled during

startup. Less than 1% of VOUT1 or VOUT2 overshoot is

observed during startup from VIN rising above the

UVLO voltage or SHDN1 or SHDN2 being enabled.

4.6

Overtemperature Protection

The TC1303B has an integrated overtemperature

protection circuit that monitors the device junction

temperature and shuts the device off if the junction tem-

perature exceeds the typical 165°C threshold. If the

overtemperature threshold is reached, the soft start is

reset so that once the junction temperature cools to

approximately 155°C, the device will automatically

restart.

tRPU

tRPD

VTH_H

VOUT2

VOL

VOH

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