TPS62870 datasheet(33/66 Pages) TI2

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Table 7-8. Functionality During Stacked Operation (continued)

FUNCTION

PRIMARY DEVICE

SECONDARY DEVICE

REMARK

SSC

Through I2C

Yes, through primary device

Daisy-chained from primary device

to secondary devices

SYNC

Yes

Yes, through primary device

Synchronization clock applied to

primary device

Precise Enable

Only binary enable

Output Discharge

Through I2C

Yes

Always enabled in secondary

devices

Fault Handling During Stacked Operation

In a stacked configuration, there are some faults that only affect individual devices and other faults that affect

all devices. For example, if one device enters current limit, only that device is affected. A thermal shutdown or

undervoltage lockout event in one device disables all devices through the shared enable (SYSTEM_READY)

signal. Table 7-9 summarizes the fault handling of the TPS6287x devices during stacked operation.

Table 7-9. Fault Handling During Stacked Operation

FAULT CONDITION

DEVICE RESPONSE

SYSTEM RESPONSE

UVLO

Enable signal pulled low

New soft start

OVLO

Thermal shutdown

Current limit

Enable signal remains high

Error amplifier clamped

7.4 Device Functional Modes

7.4.1 Power-On Reset

The device operates in POR mode when the supply voltage is less than the POR threshold, 1.4V (typical).

In POR mode, no functions are available and the content of the device registers is not valid.

The device leaves POR mode and enters UVLO mode when the supply voltage increases above the POR

threshold.

7.4.2 Undervoltage Lockout

The device operates in UVLO mode when the supply voltage is between the POR and UVLO thresholds.

If the device enters UVLO mode from POR mode, no functions are available. If the device enters UVLO mode

from standby mode, the output discharge function is available. The content of the device registers is valid in

UVLO mode.

The device leaves UVLO mode and enters POR mode when the supply voltage decreases below the POR

threshold. The device leaves UVLO mode and enters standby mode when the supply voltage increases above

the UVLO threshold.

7.4.3 Standby

The device operates in standby mode when the supply voltage is greater than the UVLO threshold (and the

device has completed the initialization) and any of the following conditions is true:

• A low level is applied to the EN pin.

• SWEN = 0 in the CONTROL1 register.

• The device junction temperature is greater than the thermal shutdown threshold.

• The supply voltage is greater than the OVLO threshold.

The device initializes during the specified time-interval td(EN)1 (typical 175µs, max 500µs), after the supply

voltage increases above the UVLO threshold voltage following a device power-on reset. If the supply voltage

decreases below the UVLO threshold but not below the POR threshold, the device does not reinitialize when

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TPS62870, TPS62871, TPS62872, TPS62873

SLVSGC5E – JANUARY 2023 – REVISED OCTOBER 2025

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