Power-Distribution Switches
www.ti.com
TPS2554 TPS2555
SLVSAM0 – JUNE 2011
Precision Adjustable Current-Limited, Power-Distribution Switches
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Description
www.ti.com
TPS2554 TPS2555
SLVSAM0 – JUNE 2011
Precision Adjustable Current-Limited, Power-Distribution Switches
Check for Samples: TPS2554, TPS2555
FEATURES
1
2 Meets USB Current-Limiting Requirements Adjustable Current Limit, 500 mA to 2.5 A (typ) Two Independently-Settable, Current-Limit
Thresholds Fast Overcurrent Response - 1.5 μs (typ) 73-mΩ High-Side MOSFET 3.8-μA Maximum Standby Supply Current PowerPAD™ Thermal Management Automatic Output Discharge when Disabled Both High-Enable (TPS2554) and Low-Enable
(TPS2555) Versions Available
APPLICATIONS
USB Ports/Hubs Digital TV Set-Top Boxes VOIP Phones
DESCRIPTION
The TPS2554/55 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 2.5 A (typ) via an external resistor.
TPS2554/55 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.
TPS2554/55 DRC Package and Typical Application Diagram
TPS2554/TPS2555 DRC PACKAGE (TOP VIEW)
GND 1 IN 2 IN 3
ILIM_SEL 4 EN/EN 5
10 FAULT
9 OUT
PAD
8 OUT
7 ILIM0
6 ILIM1
4.5 V to 5.5 V
FAULT Signal
RFAULT
Power Switch Enable
TPS2554/55
2/3 IN
OUT 8/9
100 nF
10 FAULT
ILIM_SEL 4 ILIM0 7
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