TPS25751AS datasheet(25/85 Pages) TI2

25 / 85 page

8 Detailed Description

8.1 Overview

The TPS25751A is a fully-integrated USB Power Delivery (USB-PD) management device providing cable plug

and orientation detection for USB Type-C and PD receptacles. The TPS25751A communicates with the other

USB Type-C and PD port partner at the opposite end of the cable. The TPS25751AS also enables a high voltage

port power switch for sourcing and sinking. The TPS25751AD also enables an integrated port power switch for

sourcing and sinking.

The TPS25751A is divided into several main sections:

• USB-PD controller

• Cable plug and orientation detection circuitry

• Port power switches

• Power management circuitry

• Digital core

The USB-PD controller provides the physical layer (PHY) functionality of the USB-PD protocol. The USB-PD

data is output through either the CC1 pin or the CC2 pin, depending on the orientation of the reversible USB

Type-C cable. For a high-level block diagram of the USB-PD physical layer, a description of features, and more

detailed circuitry, see USB-PD Physical Layer.

The cable plug and orientation detection analog circuitry automatically detects a USB Type-C cable plug

insertion and the cable orientation. For a high-level block diagram of cable plug and orientation detection, a

description of features, and more detailed circuitry, see Cable Plug and Orientation Detection.

The port power switches provide power to the VBUS pin and CC1 or CC2 pins based on the detected plug

orientation. For a high-level block diagram of the port power switches, a description of features, and more

detailed circuitry, see Power Paths.

The power management circuitry receives and provides power to the TPS25751A internal circuitry and

LDO_3V3 output. See Power Management for more information.

The digital core provides the engine for receiving, processing, and sending all USB-PD packets as well as

handling control of all other TPS25751A functionality. A portion of the digital core contains ROM memory, which

contains all the necessary firmware required to execute Type-C and PD applications. In addition, a section of the

ROM, called boot code, is capable of initializing the TPS25751A, loading of the device configuration information,

and loading any code patches into volatile memory in the digital core. For a high-level block diagram of the

digital core, a description of features, and more detailed circuitry, see Digital Core.

The TPS25751A has one I2C controller to write to and read from external target devices such as a battery

charger or an optional external EEPROM memory (see I2C Interface).

The TPS25751A also integrates a thermal shutdown mechanism and runs off of accurate clocks provided by the

integrated oscillator.

www.ti.com

TPS25751A

SLVSJG7 – MAY 2026

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TPS25751AS Datasheet(PDF) 25 Page - Texas Instruments