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(as set by the VRAMP[1:0] bits in the CONTROL1 register), keeping the PG pin high-impedance. After the DVS

time has passed, PG again reflects the output of the window comparator.

Note that the PG pin is always low, regardless of the output of the window comparator, when:

• The device is in thermal shutdown

• The device is disabled

• The device is in undervoltage lockout or overvoltage lockout (UVLO or OVLO)

• The device is in soft start

A small RC filter (1kΩ + 10pF, for example) can be added to the PG pin to filter out high frequency signals.

7.3.14.2 Secondary Device Behavior

Figure 7-14 shows a functional block diagram of the power-good function in a secondary device. During

initialization, the device presets FF1 and FF2, which pulls down the PG pin and forces the device to operate

in DCM. When the device completes the soft start, the device resets FF2, which turns off Q1. However, in a

stacked configuration, all devices share the same PG signal, and therefore the PG pin stays low until all devices

in the stack have completed the soft start. When that happens, FF1 is reset and the converters operate in CCM.

SOFT START

COMPLETE

Latch

SECONDARY DEVICE

DETECTED

FORCE DCM

VIL = < 0.4 V

VIH = > 0.8 V

FF1

FF2

Input

Buffer

Latch

Figure 7-14. Power-Good Functional Block Diagram (Secondary Device)

7.3.15 Remote Sense

The device has two pins, VOSNS and GOSNS, to remotely sense the output voltage. Remote sensing lets the

converter sense the output voltage directly at the point-of-load and increases the accuracy of the output voltage

regulation.

7.3.16 Thermal Warning and Shutdown

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

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TPS62870, TPS62871, TPS62872, TPS62873

SLVSGC5E – JANUARY 2023 – REVISED OCTOBER 2025

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