4.5V t 5.5V

100 k:

(1%)

3 x 100 k:

(Optional)

Control Signals

Bus Power

Power Switch

Status Signal

Type-C DFP

Status Signals

TPS25820/21

IN

EN

CHG

REF

GND

OUT

FAULT

CC1

CC2

SINK

POL

Power Pad

10

µF

Copyright © 2017, Texas Instruments Incorporated

16

TPS25820, TPS25821

SLVSE24 – NOVEMBER 2017

www.ti.com

Product Folder Links: TPS25820 TPS25821

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Copyright © 2017, Texas Instruments Incorporated

8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The TPS25820/21 are Type-C source controllers. The TPS25820 supports all Type-C DFP required functions to

support a USB 3.x port and the TPS25821 supports all required functions for a USB 2.0 DFP. The TPS25820/21

detached. The device exposes its identity via its CC pin advertising its current capability based on the CHG pin

setting. The TPS25820/21 also limits its advertised current internally and provides robust protection against faults

internally current limited. The TPS25820/21 do not support Type-C optional accessory modes (Ra/Ra and Rd/Rd

in Table 2).

The following design procedure can be used to implement a full featured Type-C source.

8.2 Typical Applications

8.2.1 Type-C Source Port Implementation without BC 1.2 Support

Figure 12 shows a minimal Type-C source implementation capable of supporting 5-V and 1.5-A charging.

Figure 12. Type-C Source Port Implementation without BC 1.2 Support

8.2.1.1 Design Requirements

8.2.1.1.1

Input and Output Capacitance Considerations

Input and output capacitance improves the performance of the device. The actual capacitance should be

optimized for the particular application. For all applications, a 0.1-μF or greater ceramic bypass capacitor

between IN and GND is recommended as close to the device as possible for local noise decoupling.

All protection circuits, including those of the TPS25820/21 device, have the potential for input voltage overshoots

and output voltage undershoots. Input voltage overshoots can be caused by either of two effects. The first cause

is an abrupt application of input voltage in conjunction with input power-bus inductance and input capacitance

when the IN pin is high-impedance (before OUT turn-on, i.e. not connected to a Type-C sink device).

Theoretically, the peak voltage is 2 times the applied voltage. The second cause is due to the abrupt reduction of