1

Functional description

The STUSB4761 is a USB type-C and Power Delivery controller IC optimized for source applications. It integrates

a CC/CV regulation loop to drive a power regulation stage.

The STUSB4761 offers the benefits of a full hardware USB PD stack allowing a robust, deterministic and

safe negotiation in line with USB PD standard. It is ideal for provider applications in which digital or software

intelligence is limited or missing.

The STUSB4761 main functions are:

1.

Detecting the connection between two ports (attach detection)

2.

Establishing a valid source-to-sink connection

3.

Determining the attached device mode: sink or accessory

4.

Checking cable power capabilities

5.

Negotiating a USB PD contract with a PD capable device

6.

Configuring the output power path accordingly

7.

Regulating voltage and current according to PD contract

8.

Monitoring VBUS, managing transitions, handling protections and ensuring user and device safety

In addition, the STUSB4761 offers customizable power data objects (PDO), VBUS under/overvoltage (UVLO /

OVLO) protections, an integrated discharge path.

Figure 1. Block diagram

GND

CC2

CC1

Physical

Layer

port status

VSENSE_DISCH

voltage

monitoring

Discharge

path

Policy

Engine

ISENSE_DISCH

CC

line

access

Protocol

Layer

Device

Policy

Manager

BMC

driver

VCONN_VSYS

VCONN SW

OVP andOCP

CC/CV

FB

OPTO_DRV

FAULT

VDD

POR

Internal

supply

T1

TSENSE

SCL

SDA

I²C

slave

T2

T3

VBUS_EN_SRC

Port C

controller

Status

register

STUSB4761

Functional description

DS13141 - Rev 3

page 2/29