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TPS2370 Datasheet(PDF) 1 Page - Texas Instruments |
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TPS2370 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 19 page TPS2370 SLUS537C − AUGUST 2002 − REVISED MARCH 2004 IEEE 802.3af POWER INTERFACE SWITCH FOR POWER OVER ETHERNET (PoE) POWERED DEVICES FEATURES D Integrated Power Interface Switch for IEEE 802.3af Powered Devices (PDs) D Provides PD Detection Signature D Provides PD Classification Signature (Class 0−4) D Programmable Inrush Current Limit D Internal 0.3-Ω Low-Side FET D Interfaces to DC/DC Soft-Start for DC/DC Enable D Internal Thermal Protection – Disconnects PD Load D Minimal External Parts Count D 8-Pin SOIC, 8-Pin TSSOP Packages APPLICATIONS D VoIP Phones D Internet Appliances D Wireless LAN Access Points D Bluetooth Access Points DESCRIPTION Acting as an interface between the power sourcing equipment (PSE) and the powered device (PD), the TPS2370 performs all detection, classification, inrush current limiting, and switch FET control that is necessary for compliance with the IEEE 802.3af Standard. An internal 0.3- Ω FET provides maximum power delivery. As an additional feature, the TPS2370 interfaces with the enable/soft-start signal of a dc-to-dc converter, eliminating the need to have an accurate UVLO in the dc-to-dc converter. At low input voltages (1.8 V to 10 V), the TPS2370 draws less than 12 µA, allowing accurate sensing of the external 24.9-k Ω discovery resistor. At input voltages between 15 V and 20 V, an external resistor sets the level of current to be drawn during classification mode. TPS2370 is compatible with current as well as voltage measurement schemes for classification. Above 20-V input, the classification current is shut off, reducing internal power dissipation. The TPS2370 drives an internal low-side FET for control of the return side of the power path. The internal FET is turned on when the input voltage reaches 40 V and above. When the input voltage decreases, the FET remains on until the input voltage drops to below 30 V. TYPICAL APPLICATION 3 1 2 4 5 TPS2370 6 DC/DC Converter/ Controller 8 Ethernet Appliance VREG 44 V TO 57 V V+ V− SMAJ54A 24.9 k W RLIM CSS CDCDCIN RCLASS UDG−03057 0.1 mf PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. PowerPAD is a trademark of Texas Instruments. Bluetooth is a trademark of Bluetooth SIC, Inc. 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. www.ti.com Copyright 2002 − 2004, Texas Instruments Incorporated |
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