TPS25751AS datasheet(31/85 Pages) TI2

31 / 85 page

When driving the line, the transmitter driver has an output impedance of ZDRIVER. ZDRIVER is determined by the

driver resistance and the shunt capacitance of the source and is frequency dependent. ZDRIVER impacts the

noise ingression in the cable.

ZDRIVER Circuit shows the simplified circuit determining ZDRIVER. The circuit is specified such that noise at the

receiver is bounded.

Driver

DRIVER

Figure 8-9. ZDRIVER Circuit

8.3.1.5 USB-PD BMC Receiver

The receiver block of the TPS25751A receives a signal that follows the allowed Rx masks defined in the USB

PD specification. The receive thresholds and hysteresis come from this mask.

Example USB-PD Multi-Drop Configuration shows an example of a multi-drop USB-PD connection (only the CC

wire). This connection has the typical Sink (device) to Source (host) connection, but also includes cable USB-PD

Tx/Rx blocks. Only one system can be transmitting at a time. All other systems are Hi-Z (ZBMCRX). The USB-PD

Specification also specifies the capacitance that can exist on the wire as well as a typical DC bias setting circuit

for attach detection.

Pullup for

Attach

Detection

CRECEIVER

Connector

CCablePlug_CC

Connector

RD for

Attach

Detection

Cable

Source

System

Sink

System

CRECEIVER

623¶ 3'

communication only

(eMarker #1)

623¶¶ 3'

communication only

(eMarker #2)

CC wire

CCablePlug_CC

Figure 8-10. Example USB-PD Multi-Drop Configuration

8.3.1.6 Squelch Receiver

The TPS25751A has a squelch receiver to monitor for the bus idle condition as defined by the USB PD

specification.

8.3.2 Power Management

The TPS25751A power management block receives power and generates voltages to provide power to the

TPS25751A internal circuitry. These generated power rails are LDO_3V3 and LDO_1V5. LDO_3V3 can also be

used as a low power output for external EEPROM memory. The power supply path is shown in Figure 8-11.

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TPS25751A

SLVSJG7 – MAY 2026

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