DFE252012C datasheet(24/63 Pages) TI1

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9.4.7 Thermal Shutdown

As soon as the junction temperature, TJ, exceeds 160°C (typ.) the device goes into thermal shutdown. In this

mode the bypass, high-side and low-side MOSFETs are turned-off. When the junction temperature falls below

the thermal shutdown minus its hysteresis, the device continuous the operation.

9.4.8 Fault State and Power-Good

The TPS6128xD/E enters the fault state under any of the followings conditions:

• The output voltage fails to achieve the required level during a start-up phase.

• The output voltage falls out of regulation (in pre-charge mode).

• The device has entered thermal shutdown.

Once a fault is triggered, the regulator stops operating and disconnects the load. After waiting 1ms, the device

attempts to restart. The TPS61280D device can be configured to signal a fault condition by pulling the open-

drain GPIO pin (nFAULT) low for a short period of time. The nFAULT output provides a falling edge triggered

interrupt signal to the host. To ensure proper operation, the GPIO port needs to be pull high quick enough, that

is, faster than ca. 200ns. To do so, it is recommended to use a GPIO pull-up resistor in the range of 1kΩ to

10kΩ.

The TPS6128xD/E (simple logic I/F version) device only provide a power-good output (PG) for signaling the

system when the regulator has successfully completed start-up and no faults have occurred. Power-good also

functions as an early warning flag for excessive die temperature and overload conditions.

• PG is asserted high when the start-up sequence is successfully completed.

• PG is pulled low when the output voltage falls approximately 10% below its regulation level or the die

temperature exceeds 115°C. PG is re-asserted high when the device cools below ca. 100°C.

• Any fault condition causes PG to be de-asserted.

• PG is pulled high when the device is operating in forced pass-through mode (that is, nBYP = L).

• PG is pulled high when the device is in shutdown mode.

TPS61280D, TPS61281D, TPS61282D,, TPS61280E

SLVSEA0B – JANUARY 2018 – REVISED JUNE 2023

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Product Folder Links: TPS61280D TPS61281D TPS61282D, TPS61280E

DFE252012C Datasheet(PDF) 24 Page - Texas Instruments