User

's Guide

SLVU471

– June 2011

TPD4S014 EVM

Introduction

The TPD4S014 is a single-chip solution for USB

charger port protection. This device offers low

capacitance TVS type ESD clamps for the D+, D

–

and standard Capacitance for the ID pin. On the

VBUS pin, this device can handle over-voltage

protection up to 28V. The over voltage lock-out

feature ensures that, if there is a fault condition at

the VBUS line, the TPD4S014 is able to isolate

the VBUS line and protect the internal circuitry

from damage.

Similarly, the under voltage lock out feature

ensures that there is no power drain from the

internal VCC plane to external VBUS side in case

there is short to GND. There is a 16ms turn-on

delay after VBUS crosses the under voltage

lockout threshold, in order to let the voltage

stabilize before closing the switch. This function

acts as a deglitch filter and prevents unnecessary

switching if there is any ringing on the line during

connection.

Highlighted Features

•

Over-voltage protection functionality

•

Under voltage lockout functionality

•

USB connectors used for ease of use

•

LED indicating fault condition

•

Test point for EN and ACK signals

•

D+, D

– lines are routed as differential pair

•

Bottom section of board can be used for measurement of bandwidth and ESD performance.

EVM Description and Configuration

The TPD4S014EVM consists of two separate sections, the TOP section and the BOTTOM section. Both

these sections are powered up by a 1.8V

– 3.3V supply. This supply is used for three purposes:

1. To provide the HI and LO logic levels for the EN signal

2. To provide a pullup voltage for the open drain ACK signal

3. To power the fault indicator LED

The TOP section consists of the USB connectors. The connector on the Left (marked INPUT) connects to

the VBUS of the TPD4S014 and the one of the right (marked OUTPUT) connects to the VCC of the

1

SLVU471

– June 2011

TPD4S014 EVM

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© 2011, Texas Instruments Incorporated