1 Features
• 2.5-V to 5.5-V VOPERATING
• Pin-to-Pin with TPS2553
• 2-A ICONT_MAX
• 0.275-A to 2.7-A Adjustable ILIMIT (±6.5% at 1.7 A)
• 70-mΩ (typical) RON
• 1.5-μs Short Circuit Response
• 8-ms Fault Reporting Deglitch
• Reverse Current Blocking (when disabled)
• Built-In Soft Start
• UL 60950 and UL 62368 Recognition
• 15-kV ESD Protection per IEC 61000-4-2 (with
external capacitance)

2 Applications
• USB Ports/Hubs, Laptops, Desktops
• HDTV
• Set Top Boxes
• Optical Socket Protection

3 Description
The TPS25221 is intended for applications where
heavy capacitive loads and short circuits may be
encountered. The programmable current-limit
threshold maybe set between 275 mA and 2.7 A
(typical) using an external resistor. ILIMIT accuracy as
tight as ±6% can be achieved at the higher currentlimit
settings. Power-switch rise and fall times are
controlled to minimize current surges during turn on
and turn off.
When a load attempts to draw current exceeding the
programmed ILIMIT the internal FET enters constant
current mode in order to keep ILOAD at or below ILIMIT.
The FAULT output will assert low during over-current
conditions after the built in de-glitch time.