TPS25751AS datasheet(34/85 Pages) TI2

34 / 85 page

8.3.3.1.7 PP_CABLE Local Overtemperature Shut Down (OTSD)

When PP_CABLE clamps the current, the temperature of the switch begins to increase. When the local

temperature sensors of PP_5V or PP_CABLE detect that TJ>TSD_PP5V, the PP_CABLE switch is disabled and

latched off within tPP_CABLE_off. The port then enters the USB Type-C ErrorRecovery state.

8.3.3.1.8 PP_CABLE UVLO

If the PP5V pin voltage falls below the undervoltage lock out threshold (VPP5V_UVLO), then the PP_CABLE switch

is automatically disabled within tPP_CABLE_off.

8.3.3.2 TPS25751AD Internal Powerpath

The TPS25751AD has internal controls for internal FETs (GATE_VSYS and GATE_VBUS as shown in Internal

Powerpath) that require that VBUS_IN be above VVBUS_UVLO before being able to enable the powerpath. Internal

Powerpath shows a diagram of the powerpath. When a powerpath is enabled, the circuitry includes a slew rate

control loop to make sure that external switches do not turn on too quickly (SS). The TPS25751AD senses the

PPHV and VBUS voltages to control the gate voltages to enable or disable the FETs.

The powerpath control includes overvoltage protection (OVP) and reverse current protection (RCP).

PPH

Figure 8-13. Internal Powerpath

8.3.3.2.1 Overvoltage Protection (OVP)

The application firmware enables the OVP and configures the device based on the expected VBUS voltage.

When the VBUS voltage surpasses the overvoltage protection parameters, the external powerpath is disabled.

If the voltage on VBUS surpasses the configured threshold VOVP4VSYS = VOVP4RCP/rOVP, then GATE_VSYS is

automatically disabled within tPPHV_FSD to protect the system. If the voltage on VBUS surpasses the configured

threshold VOVP4RCP, then GATE_VBUS is automatically disabled within tPPHV_OVP. When VVBUS falls below

VOVP4RCP - VOVP4RCPH, GATE_VBUS is automatically re-enabled within tPPHV_ON because the OVP condition has

cleared. This action allows two sinking power paths to be enabled simultaneously and GATE_VBUS disables

when necessary to make sure that VVBUS remains below VOVP4RCP.

While the TPS25751A is in BOOT mode in a dead-battery scenario (that is VIN_3V3 is low), the device handles

an OVP condition slightly differently. As long as the OVP condition is present, GATE_VBUS and GATE_VSYS

are disabled. Once the OVP condition clears, both GATE_VBUS and GATE_VSYS are re-enabled. Because this

mode is a dead-battery condition, the TPS25751A draws approximately IVIN_3V3, ActSnk from VBUS during this

time to help discharge it.

TPS25751A

SLVSJG7 – MAY 2026

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TPS25751AS Datasheet(PDF) 34 Page - Texas Instruments