TPS62870 datasheet(27/66 Pages) TI2

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7.3.13.2 Hiccup Mode

To enable hiccup operation, make sure that HICCUPEN = 1 in the CONTROL1 register.

If hiccup operation is enabled and the high-side switch current exceeds the current limit threshold on 32

consecutive switching cycles, the device:

• Stops switching for 128µs, after which the device automatically starts switching again (the device starts a new

soft-start sequence).

• Sets the HICCUP bit in the STATUS register.

• Pulls the PG pin low. The PG pin stays low until the overload condition goes away and the device can start up

correctly and regulate the output voltage. Note that power-good function has a deglitch circuit, which delays

the rising edge of the power-good signal by 40µs (typical).

Hiccup operation continues in a repeating sequence of 32 cycles in current limit, followed by a pause of 128µs,

followed by a soft-start attempt for as long as the output overload condition exists.

The device clears the HICCUP bit if the user reads the STATUS register when the overload condition has been

removed.

7.3.13.3 Current Limit Mode

To enable current limit mode, make sure that HICCUPEN = 0 in the CONTROL1 register.

When current limit operation is enabled, the device limits the high-side switch current cycle-by-cycle for as long

as the overload condition exists. If the device limits the high-side switch current for four or more consecutive

switching cycles, the device sets ILIM = 1 in the STATUS register.

The device clears the ILIM bit if the user reads the STATUS register when the overload condition no longer exits.

7.3.14 Power Good (PG)

The power-good (PG) pin is bidirectional and has two functions:

• In a standalone configuration and in the primary device of a stacked configuration, the PG pin is an open-

drain output that indicates the status of the converter or stack.

• In a secondary device of a stacked configuration, the PG pin is an input that indicates when the soft-start

sequence is complete and all converters in the stack can change from DCM switching to CCM switching.

VOUT

VT-(UVP)

VT+(UVP)

UVP

VT-(OVP)

VT+(OVP)

OVP

td(PG)

Figure 7-12. PG Timing

7.3.14.1 Standalone or Primary Device Behavior

The primary purpose of the PG pin is to indicate if the output voltage is in regulation, but the PG pin also

indicates if the device is in thermal shutdown or disabled. Table 7-7 summarizes the behavior of the PG pin in a

standalone or primary device.

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TPS62870, TPS62871, TPS62872, TPS62873

SLVSGC5E – JANUARY 2023 – REVISED OCTOBER 2025

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