TPD4S014EVM Datasheet, PDF (1/5 Pages) Texas Instruments – Over-voltage protection functionality

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.
User's Guide
SLVU471 – June 2011
TPD4S014 EVM
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
SLVU471 – June 2011
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Copyright © 2011, Texas Instruments Incorporated
TPD4S014 EVM
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