TPS2378 Datasheet, PDF (1/25 Pages) Texas Instruments – IEEE 802.3at PoE High-Power PD Interface

TPS2378
www.ti.com
SLVSB99A – MARCH 2012 – REVISED MARCH 2012
IEEE 802.3at PoE High-Power PD Interface
Check for Samples: TPS2378
FEATURES
1
•2 IEEE 802.3at Type-2 Hardware Classification
with Status Flag
• Adapter Priority Input
• DC/DC Converter Enable
• Robust 100 V, 0.5 Ω Hotswap MOSFET
• Operating Current up to 850 mA
• 1A (Typical) Operating Current Limit
• 15 kV/8 kV System-level ESD Capability
• PowerPAD™ SO-8 Package
APPLICATIONS
• IEEE 802.3at-compliant Devices
• Video and VoIP Telephones
• Multiband Access Points
• Security Cameras
• Pico-base Stations
DESCRIPTION
This 8-pin integrated circuit contains all of the features needed to implement an IEEE802.3at type-2 powered
device (PD). The low 0.5 Ω internal switch resistance, combined with the enhanced thermal dissipation of the
PowerPAD™ package, enables this controller to continuously handle up to 0.85 A. The TPS2378 features an
auxiliary power detect (APD) input, providing priority for an external power adapter. It also features a 100 V pass
transistor, 140 mA inrush current limiting, type-2 indication, auto-retry fault protection, and an open-drain power-
good output.
SO-8 PowerPad
V_DD
1
DEN
2
CLS
3
V_SS
4
8
APD
7
T2P
6
CDB
5
RTN
AC
Adapter
TPS2378
V_C
V_DD
DEN
R_T2P
T2P
CLS ^CDB
SS
APD
V_SS RTN
D_A
R_APD1
Figure 1. Typical Application
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 © 2012, Texas Instruments Incorporated