TPS7A16

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SBVS171F – DECEMBER 2011 – REVISED OCTOBER 2015

7.3 Feature Description

7.3.1 Enable (EN)

The enable terminal is a high-voltage-tolerant terminal. A high input on EN actives the device and turns on the

initial power up, the regulator has a soft start incorporated to control the initial current through the pass element.

In the event that the regulator drops out of regulation, the output tracks the input minus a drop based on the load

current. When the input voltage drops below the UVLO threshold, the regulator shuts down until the input voltage

recovers above the minimum start-up level.

7.3.3 Power-Good

The power-good (PG) pin is an open-drain output and can be connected to any 5-V or lower rail through an

output voltage monitoring is not needed, the PG pin can be left floating or connected to GND.

7.3.4 PG Delay Timer (DELAY)

connected from the DELAY pin to GND; this capacitor is charged from 0 V to approximately 1.8 V by the DELAY

= 10 nF, the PG delay time is approximately 12 ms; that is, (10 nF × 1.193 V) / 1 µA = 11.93 ms.

7.3.5 Internal Current Limit

The fixed internal current limit of the TPS7A16 family helps protect the regulator during fault conditions. The

maximum amount of current the device can source is the current limit (225 mA, typical), and is largely

independent of output voltage. For reliable operation, do not operate the device in current limit for extended

periods of time.

7.3.6 Thermal Protection

Thermal protection disables the output when the junction temperature rises to approximately 170°C, allowing the

device to cool. When the junction temperature cools to approximately 150°C, the output circuitry is enabled.

Depending on power dissipation, thermal resistance, and ambient temperature, the thermal protection circuit may

cycle ON and OFF. This cycling limits the dissipation of the regulator, protecting it from damage as a result of

overheating.

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