PP5V

VBUS

PP5V Gate Control,

Current Limit, and RCP

VLDO

PPHV Gate Control

and RCP

PPHV

Control

EN0

TSD

Power

Mux

&

LDO

FLT

EN1

VBUS

UVLO

PP5V

OVP

PP5V

UVLO

IREF

VBUS

OVP

OVP

VIN

12

TPS66020, TPS66021

SLVSEW8 – AUGUST 2019

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Product Folder Links: TPS66020 TPS66021

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Copyright © 2019, Texas Instruments Incorporated

8 Detailed Description

8.1 Overview

The TPS6602x is a fully featured power multiplexer with an integrated Source power path, a Sink power path,

and a high voltage VBUS LDO voltage regulator. The Source power path can supply 5-V nominal power and

supports two current limit settings (1.5 A or 3 A) controlled by general-purpose I/O. The Source power path

includes current limit protection, overtemperature protection, reverse-current protection, undervoltage protection,

and overvoltage protection. See the 5-V Source (PP5V Power Path) section. The Sink power path can support

up to 5 A at 20 V controlled by general-purpose I/O. The Sink power path includes soft-start to minimize in-rush

currents, overtemperature protection, reverse-current protection, undervoltage protection, and an optional

overvoltage protection configured in the application. See the 20-V Sink (PPHV Power Path) section. The

TPS6602x fully supports Fast Role Swap operation as specified in the Power Delivery specification. See the Fast

Role Swap (FRS) section.

The VBUS low dropout voltage regulator may be used in systems that require power during dead battery

conditions and is capable of provide up to 30 mA to the system via the VLDO pin. Once VIN power is available,

VLDO pin is power is switched from the VBUS LDO regulator to the VIN pin. The TPS66020 devices VBUS LDO

regulator nominally supplies 3.3 V where the TPS66021 device VBUS LDO nominally supplies 5 V. See the

Power Management and Supervisory section.

8.2 Functional Block Diagram

8.3 Feature Description

8.3.1 5-V Source (PP5V Power Path)

The PP5V power path uses two back-to-back N-channel MOSFETs, and blocks current in both directions when

the power path is disabled. The PP5V power path is a Source only path and when enabled provides power from

the PP5V terminal to the VBUS terminal. The PP5V path provides up to 3-A current delivery to VBUS.