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STHS4257A1

STMicroelectronics
Part Number STHS4257A1
Manufacturer STMicroelectronics
Description IEEE 802.3af PoE Powered Device (PD) interface controller
Published May 2, 2009
Detailed Description STHS4257A, STHS4257A1 STHS4257L, STHS4257L1 IEEE 802.3af PoE Powered Device (PD) interface controller with integrated si...
Datasheet PDF File STHS4257A1 PDF File

STHS4257A1
STHS4257A1

Overview
STHS4257A, STHS4257A1 STHS4257L, STHS4257L1 IEEE 802.
3af PoE Powered Device (PD) interface controller with integrated signature resistor www.
datasheet4u.
com Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ IEEE 802.
3af-compliant interface for Powered Devices (PDs) Integrated 100V, 450mA power MOSFET low side switch Inrush current limit Normal operation current limit Integrated 25kΩ signature resistor Signature disable (STHS4257A1/L1) Resistor-programmable classification current (Class 0-4) Power Good output, open drain Undervoltage Lockout (UVLO) Thermal overload protection (two-step for the STHS4257A/L) Latch (L) or auto-retry (A) after repetitive thermal overload Industrial temperature range: –40 to...


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