IN

GND

FAULT

Control

Signal

4.5 V-6.5 V

0.1PF

Fault

Signal

EN

OUT

TPS2001D

4

1/2

5

6/7/8

1

Copyright © 2017, Texas Instruments Incorporated

13

TPS2001D

www.ti.com

SLVSE25A – JULY 2017 – REVISED OCTOBER 2017

Product Folder Links: TPS2001D

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Copyright © 2017, Texas Instruments Incorporated

9 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.

9.1 Application Information

The TPS2001D current-limited power switch uses an N-channel MOSFET in applications requiring continuous

load current. The device enters constant-current mode when the load exceeds the current limit threshold.

9.2 Typical Application

Figure 21. Typical Application Schematic

9.2.1 Design Requirements

For this design example, use the following input parameters:

1. The TPS2001D operates from a 5-V to ±0.5-V input rail.

2. What is the normal operation current, for example, the maximum allowable current drawn by portable

equipment for USB 3.0 port is 900 mA, so the normal operation current is 900 mA, and the minimum current

limit of power switch must exceed 900 mA to avoid false trigger during normal operation.

3. What is the maximum allowable current provided by up-stream power, the maximum current limit of power

switch that must lower it to ensure power switch can protect the up-stream power when overload is

encountered at the output of power switch.

9.2.2 Detailed Design Procedure

To begin the design process a few parameters must be decided upon. The designer must know the following:

1. Normal input operation voltage

2. Output continuous current

3. Maximum up-stream power supply output current

9.2.2.1 Input and Output Capacitance

Input and output capacitance improves the performance of the device; the actual capacitance must be optimized

for the particular application. For all applications, TI recommends placing a 0.1-µF or greater ceramic bypass

capacitor between IN and GND, as close to the device as possible for local noise decoupling.

All protection circuits have the potential for input voltage overshoots and output voltage undershoots.