UPD301B datasheet(7/45 Pages) MICROCHIP

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2020 Microchip Technology Inc.

DS00003412A-page 7

UPD301B/C

2.3

Example Applications

The UPD301B/C has been designed for multiple applications, including:

• UPD301B

- Source-Only Applications (E.G., Charging Ports) (UPD301B Only)

- Two-Port, Three-Port, and Four-Port Source-Only Applications (E.G., Automotive Rear Seat Charging)

(UPD301B Only)

• UPD301C

- Bus-Powered or Battery Powered Sink-Only Applications (UPD301C Only)

- Dual Role Power/Data Application (5V Source, High Voltage Sink) (UPD301C Only)

- Dual Role Power/Data Application (High Voltage Source, 5V @ 0A Sink) (UPD301C Only)

- 2-Port Dual Role Power/Data Application ‘Charge-Through Adapter’ (UPD301C Only)

2.3.1

SOURCE-ONLY APPLICATIONS (E.G., CHARGING PORTS) (UPD301B ONLY)

The simplest UPD301B application is a power source (Source-Only), as shown in Figure 2-1. The UPD301B control

I/O configures the DC-DC converter, selecting the output voltage, and controls the load switch to regulate and protect

the output voltage. The load switch can also be replaced by discrete FETs and over-current / over-voltage protection

circuits.

Additional notes on Source-Only Charging Port Applications:

• Supporting USB data is not required for a Charging Port.

• A Power Source Load Switch is optional for Source-Only ports. Source-Only ports are permitted to maintain a

large bulk capacitance on VBUS at all times, even when the port is in the detached state.

• USB3 operation is optional for PD docking ports.

Note:

Single-Port Source, Single-Port Sink, and Dual-Port Source modes are the only supported modes of oper-

ation. Dual-Port Sink and Source + Sink modes are not supported without custom firmware.

FIGURE 2-1:

SYSTEM BLOCK DIAGRAM - SOURCE-ONLY APPLICATION

Microchip

UPD301B

CC1

CC2

VBUS

60W Load

Switch

DC In

Control I/O

(GPIO, DAC,

or I

2C)

Load Switch

DC‐DC

Converter

Optional

VBUS_DET

POWER

RESET

Fault Indicator

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