TPS2556 Datasheet, PDF (1/23 Pages) Texas Instruments – PRECISION ADJUSTABLE CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES

TPS2556
TPS2557
www.ti.com
SLVS931A – NOVEMBER 2009 – REVISED FEBRUARY 2012
PRECISION ADJUSTABLE CURRENT-LIMITED POWER-DISTRIBUTION SWITCHES
Check for Samples: TPS2556, TPS2557
FEATURES
1
•2 Meets USB Current-Limiting Requirements
• Adjustable Current Limit, 500 mA–5 A (typ)
• +/- 6.5% Current-Limit Accuracy at 4.5 A
• Fast Overcurrent Response - 3.5-μS (typ)
• 22-mΩ High-Side MOSFET
• Operating Range: 2.5 V to 6.5 V
• 2-μA Maximum Standby Supply Current
• Built-in Soft-Start
• 15 kV / 8 kV System-Level ESD Capable
• UL Listed* – File No. E169910
• CB & Nemko Certification*
• *R_ILIM ≥ 24.9 kΩ (5A maximum)
APPLICATIONS
• USB Ports/Hubs
• Digital TV
• Set-Top Boxes
• VOIP Phones
DESCRIPTION
The TPS2556/57 power-distribution switches are
intended for applications where precision current
limiting is required or heavy capacitive loads and
short circuits are encountered. These devices offer a
programmable current-limit threshold between 500
mA and 5.0 A (typ) via an external resistor. The
power-switch rise and fall times are controlled to
minimize current surges during turn on/off.
TPS2556/57 devices limit the output current to a safe
level by switching into a constant-current mode when
the output load exceeds the current-limit threshold.
The FAULT logic output asserts low during
overcurrent and over temperature conditions.
TPS2556/57
DRB PACKAGE
(TOP VIEW)
GND
IN
IN
EN
1
8
2 _PAD 7
3
6
4
5
FAULT
OUT
OUT
ILIM
EN = Active Low for the TPS2556
EN = Active High for the TPS2557
2.5V – 6.5V
RFAULT
100 kΩ
Fault Signal
Control Signal
TPS2556/57
0.1 uF
IN
OUT
IN
OUT
FAULT
EN
RILIM
ILIM
GND
Power Pad
Figure 1. Typical Application as USB Power Switch
VOUT
CLOAD
1
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas
Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PowerPAD is a trademark of Texas Instruments.
2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2009–2012, Texas Instruments Incorporated