TPS25821 datasheet(13/35 Pages) TI1

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Charge

Pump

Current

Limit

OTSD

Thermal

Sense

Current Sense

OUT

CC1

CC2

Gate

Control

FAULT

SINK

POL

Control

Logic

Monitor

CHG

GND

REF

UVLO

TPS25820, TPS25821

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SLVSE24 – NOVEMBER 2017

Product Folder Links: TPS25820 TPS25821

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Functional Block Diagrams (continued)

Figure 11. TPS25821 Functional Block Diagram

7.3 Feature Description

Both the TPS25820 and TPS25821 are source (i.e. DFP) Type-C port controllers with integrated power switches

for VBUS. The TPS25820 also has integrated power switches for VCONN. Refer to the functional block diagrams

(Figure 10 and Figure 11). The TPS25820/21 devices do not support BC1.2 charging modes, because it does not

interact with USB D+ and D– data lines. However supporting DCP mode of BC1.2 can be easily accomplished in

data-less ports like wall chargers and CLAs by simply tying a 100-

Ω resistor between the D+ and D- pins of the

Type-C connector.

The TPS25820 has a built-in VCONN current limiting switch and can be used to implement USB 3.1 DFP, whereas

the TPS25821 does not implement a VCONN current limiting switch hence is used in the implementation in USB

2.0 DFP ports or as a USB source only port. Other than the VCONN current limiting switch there are no other

functional differences between the TPS25820 and TPS25821.

7.3.1 Configuration Channel Pins CC1 and CC2

The TPS25820/21 devices have two pins, CC1 and CC2 that serve to detect an attachment to the port and

resolve cable orientation. These pins are also used to establish the current broadcast to a valid sink and

configure VCONN (TPS25820 only).

TPS25821 Datasheet(PDF) 13 Page - Texas Instruments

TPS25821 Datasheet(HTML) 13 Page - Texas Instruments

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