PPHV

PP5V

IREF

EN1

EN0

VBUS

GND

VLDO

FLT

TPS66020

GPIO1

GPIO2

3V_IN

PD

Controller

GPIO3

4S2P

VSYS

5V Buck

Battery

Charger

OVP

VIN

VMON

CC1

CC2

Opt.

EN

from EC

VIN

VBAT

2

2

2

2

2

SBU1/2

RX1

TX1

RX2

TX2

D+/-

2

D+/-

2

CC2

CC1

GND

VBUS

Type-C

Receptacle

3.3V Buck

EN

VIN

from EC

VCON_IN

TVS2200

IN

GND

Opt.

Opt.

30

TPS66020, TPS66021

SLVSEW8 – AUGUST 2019

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Product Folder Links: TPS66020 TPS66021

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Copyright © 2019, Texas Instruments Incorporated

Typical Application (continued)

Figure 20. Single Port Type-C PD Port Using a 3.3-V Supply.

9.2.1 Design Requirements

For a single port notebook application, Table 4 lists the input voltage requirements and expected current

capabilities.

Table 4. Single-Port Notebook Application Design Parameters

DESIGN PARAMETERS

EXAMPLE VALUE(S)

POWER PATH DIRECTION

PP5V Input Voltage and Current

Capabilities

5V/3A

Source from PP5V to VBUS

VCON_IN Input Voltage and

Current Capabilities

5V/300mA (1.5W)

Source to VCONN

VBUS Input Voltage and Current

Capabilities

5V/3A, 9V/3A, 15V/3A, 20V/3A

Sink from VBUS to PPHV

5V_IN Input Voltage and Current

Capabilities

4.5-5.5V/30mA

5-V PD Controller Supply

3V_IN Input Voltage and Current

Capabilities

3.0-3.6V/30mA

3.3-V PD Controller Supply

9.2.2 Detailed Design Procedure

reference current required to meet the min/max current limit specifications in the datasheet of the PP5V power

path. An overall resistance tolerance of +/- 1% is required to meet the datasheet specifications which includes

aging, temperature, and resistance variation. A +/- 0.5% resistor is recommended. Care should be taken to

the current limit setting due to voltage drops that may occur across the ground supply.