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An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

TPS2421-1, TPS2421-2

SLUS907I – JANUARY 2009 – REVISED JANUARY 2015

TPS242x 5-A, 20-V Integrated FET Hot Swap

1

1 Features

1

•

Integrated Pass MOSFET

•

Up to 20-V Bus Operation

•

Programmable Fault Current

•

Current Limit Proportionally Larger than Fault

Current

•

Programmable Fault Timer

•

Internal MOSFET Power Limiting

•

Latch-Off on Fault (TPS2421-1) and Retry

(TPS2421-2) Versions

•

SO-8 PowerPad™ Package

•

–40°C to 125°C Junction Temperature Range

•

UL2367 Recognized - File Number E169910

2 Applications

•

RAID Arrays

•

Telecommunications

•

Plug-In Circuit Boards

•

Disk Drives

•

SSDs

•

PCIE

•

Fan Control

3 Description

The TPS2421 device provides highly integrated hot

swap power management and superior protection in

applications where the load is powered by busses up

to 20 V. The TPS2421 device is well suited to

standard bus voltages as low as 3.3 V because of the

maximum-UV turn-on threshold of 2.9 V. These

devices are very effective in systems where a voltage

bus must be protected to prevent shorts from

interrupting or damaging the unit. The TPS2421

device is an easy to use devices in an 8-pin

PowerPad™ SO-8 package.

The TPS2421 device has multiple programmable

protection features. Load protection is accomplished

by a non-current limiting fault threshold, a hard

current limit, and a fault timer. The current dual

thresholds allow the system to draw short high

current pulses, while the fault timer is running, without

causing a voltage droop at the load. An example of

this is a disk drive startup. This technique is ideal for

loads that experience brief high demand, but benefit

from protection levels in-line with their average

current draw.

Hotswap MOSFET protection is provided by power

limit circuitry which protects the internal MOSFET

against SOA related failures.

The TPS2421 device is available in latch-off on fault

(TPS2421-1) and retry on fault (TPS2421-2).

Device Information(1)

PART NUMBER

PACKAGE

BODY SIZE (NOM)

TPS2421-1

HSOP (8)

4.89mm x 3.90mm

TPS2421-2

(1) For all available packages, see the orderable addendum at

the end of the data sheet.

4 Typical Application