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STHS4257L

STMicroelectronics
Part Number STHS4257L
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 STHS4257L PDF File

STHS4257L
STHS4257L

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 +85°C SO8 and DFN8 (3mm x 3mm) packages RoHS compliant 8 1 SO8 (M) DFN8 3mm x 3mm (DB) Applications ■ ■ ■ Voice over IP (VoIP) phones Table 1.
Device options Signature disable Order code s b O STHS4257A t e ol o r eP ✔ ) s t( c du 39.
2 36.
0 39.
2 30.
5 30.
5 30.
5 30.
5 -O ■ ■ ■ l o bs Web cameras WLAN access points Internet appliances POS terminals RFID readers P e et c u d o r ) s t( UVLO threshold, rising (V) UVLO threshold, falling (V) Protection mode Thermal overload protection 2 steps 1 step 2 steps 1 step Inrush current limit (mA, typ) Normal operation current limit (mA, typ) Auto Auto Latch Latch 350/188 (1) 140 350/188 (1) 140 375 375 STHS4257A1 STHS4257L STHS4257L1 ✔ 36.
0 1.
Current limit is common for both modes and gets reduced only in case of thermal overload.
See Table 5: Electrical parameters.
July 2007 Rev 4 1/18 www.
st.
com 1 Contents STHS4257A, STHS4257A1, STHS4257L, STHS4257L1 Contents 1 www.
datasheet4u.
com Summary description .
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5 1.
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