User's Guide
SLVU839 – February 2013
TPD4S214EVM
1
Introduction
The TPD4S214 is a single-chip protection solution for USB On-the-Go and other current limited USB
applications. This device includes an integrated low R
DS(ON)
N-channel current limited switch for OTG
current supply to peripheral devices. TPD4S214 offers low capacitance TVS ESD clamps for the D+, D–,
and ID pins for both USB2.0 and USB3.0 applications. The VBUS pin can handle continuous voltage
ranging from –2V to 30V. The over voltage lock-out (OVLO) at the VBUS pin ensures that if there is a fault
condition at the VBUS line, the TPD4S214 is able to isolate it and protects the system from damage.
Similarly, the under voltage lock out (UVLO) at the VOTG_IN pin ensures that there is no power drain
from the internal OTG supply to external VBUS if VOTG_IN drops below safe operating level.
When EN is high, the OTG switch is activated and the FLT pin indicates whether there is a fault condition.
The soft start feature waits 16 ms to turn on the OTG switch after all operating conditions are met. The
FLT pin asserts low during any one of the following fault conditions: OVLO (V
BUS
> V
OVLO
), over
temperature, over current, short circuit condition, or reverse-current-condition (V
BUS
> V
OTG_IN
). The OTG
switch is turned off during any fault condition; in addition, it is also turned off during UVLO condition
(V
OTG_IN
< V
UVLO
). Once the switch is turned off, the IC periodically rechecks the faults and UVLO internally.
If the IC returns to normal operating conditions, the switch turns back on and FLT is reset to high.
There is also a VBUS detection feature for facilitating USB communication between USB host and
peripheral device. Refer to Table 2 in data sheet for detection scheme. If this is not used, DET pin can be
either floating or connected to ground.
1
SLVU839 – February 2013
TPD4S214EVM
Copyright © 2013, Texas Instruments Incorporated
