TPS25751AS datasheet(39/85 Pages) TI2

39 / 85 page

8.3.3.3.3 VBUS UVLO

The TPS25751A monitors VBUS voltage and detects when the voltage falls below VVBUS_UVLO. When the

UVLO condition is detected, GATE_VBUS is disabled within tPPHV_RCP. When the UVLO condition is cleared,

GATE_VBUS is re-enabled within tPPHV_ON.

8.3.3.3.4 Discharging VBUS to Safe Voltage

The TPS25751A has an integrated active pulldown (IDSCH) on VBUS for discharging from high voltage to

VSAFE0V (0.8V). This discharge is applied when the device is in an Unattached Type-C state.

8.3.4 Cable Plug and Orientation Detection

Figure 8-20 shows the plug and orientation detection block at each CCy pin (CC1, CC2). Each pin has identical

detection circuitry.

VREF1

VREF2

VREF3

IRpDef

IRp1.5

IRp3.0

RSNK

CCy

Figure 8-20. Plug and Orientation Detection Block

8.3.4.1 Configured as a Source

When configured as a source, the TPS25751A detects when a cable or a Sink is attached using the CC1 and

CC2 pins. When in a disconnected state, the TPS25751A monitors the voltages on these pins to determine

what, if anything, is connected. See USB Type-C Specification for more information.

Cable Detect States for a Source shows the cable detect states for a source.

Table 8-1. Cable Detect States for a Source

CC1

CC2

CONNECTION STATE

RESULTING ACTION

Open

Nothing attached

Continue monitoring both CCy pins for attach. Power is not applied to VBUS or

VCONN.

Open

Sink attached

Monitor CC1 for detach. Power is applied to VBUS but not to VCONN (CC2).

Open

Sink attached

Monitor CC2 for detach. Power is applied to VBUS but not to VCONN (CC1).

Open

Powered Cable-No UFP

attached

Monitor CC2 for a Sink attach and CC1 for cable detach. Power is not applied to

VBUS or VCONN (CC1).

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TPS25751A

SLVSJG7 – MAY 2026

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