The device has a two-level overtemperature detection function.

If the junction temperature rises above the thermal warning threshold of 150°C (typical), the device sets the TWARN bit in the STATUS register. The device clears the TWARN bit if the user reads the STATUS register when the junction temperature is below the TWARN threshold of 130°C (typical).

If the junction temperature rises above the thermal shutdown threshold of 170°C (typical), the device:

• Stops switching
• Pulls down the EN pin (if SINGLE = 0 in the CONTROL3 register)
• Enables the output discharge (if DISCHEN = 1 in the CONTROL1 register)
• Sets the TSHUT bit in the STATUS register
• Pulls the PG pin low

If the junction temperature falls below the thermal shutdown threshold of 150°C (typical), the device:

• Starts switching again, starting with a new soft-start sequence
• Sets the EN pin to high impedance
• Sets the PG pin to high-impedance

The device clears the TSHUT bit if the user reads the STATUS register when the junction temperature is below the TSHUT threshold of 150°C (typical).

In a stacked configuration, in which all devices share a common enable signal, a thermal shutdown condition in one device disables the entire stack. When the hot device cools down, the whole stack automatically starts switching again.