TPS2371PWR ,Legacy/IEEE802.3af Compatible Power Interface Switch for PoE PDs SLUS566A − JULY 2003 − REVISED NOVEMBER 2003TERMINAL FUNCTIONSTERMINALI/O I/O DESCRIPTION D ..
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TS831-5IZT ,MICROPOWER VOLTAGE SUPERVISOR RESET ACTIVE LOWELECTRICAL CHARACTERISTICS Tamb = 25°C (unless otherwise specified) Symbol Parameter Min. Typ. M ..
TS834-5I ,MICROPOWER VOLTAGE SUPERVISOR RESET ACTIVE LOW OR HIGH WITH INTEGRATED TIMERTS834 MICROPOWER VOLTAGE SUPERVISORRESET ACTIVE LOW OR HIGH WITH INTEGRATED TIMER.ULTRA LOW POWER ..
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TS834-5IDT ,MICROPOWER VOLTAGE SUPERVISOR RESET ACTIVE LOW OR HIGH WITH INTEGRATED TIMERTS834MICROPOWER VOLTAGE SUPERVISORRESET ACTIVE LOW OR HIGH INTEGRATED TIMER ■ ULTRA LOW POWER CONS ..
TS836-4IDT ,MICROPOWER VOLTAGE SUPERVISOR RESET ACTIVE HIGHTS836MICROPOWER VOLTAGE SUPERVISORRESET ACTIVE HIGH ■ ULTRA LOW POWER CONSUMPTION : 12μA m ..
TS83C51RC2-MCB , High Performance 8-bit Microcontroller
TPS2371PWR
Legacy/IEEE802.3af Compatible Power Interface Switch for PoE PDs
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FEATURES Integrated Power Interface Switch for IEEE
802.3af Powered Devices (PDs) Precision UVLO Thresholds 20-ms UVLO Off-Time Delay Provides PD Detection Signature Provides PD Classification Signature
(Class 0−4) Programmable Inrush Current Limit Internal 0.3-Ω Low-Side FET Interfaces to DC/DC Soft-Start for DC/DC
Enable Internal Thermal Protection – Disconnects
PD Load 8-Pin SOIC, 8-Pin TSSOP Packages
APPLICATIONS VoIP Phones Internet Appliances Wireless LAN Access Points Bluetooth Access Points
DESCRIPTIONActing as an interface between the Power Source
Equipment (PSE) and the Powered Device (PD),
the TPS2371 performs all detection, class−
ification, inrush current limiting, and switch FET
control that is necessary for compatibility with
Legacy/IEEE 802.3af Standard. The TPS2371
incorporates precision UVLO thresholds and
hysteresis as well as a UVLO off-time delay to
enable Legacy IEEE802.3af PoE compatibilty. An
internal 0.3-Ω FET provides maximum power
delivery. As an additional feature, the TPS2371
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 TPS2371
draws less than 12 µA, allowing accurate sensing
of the external 24.9-kΩ 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. TPS2371 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.
