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STHS4257A Datasheet(PDF) 1 Page - STMicroelectronics |
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STHS4257A Datasheet(HTML) 1 Page - STMicroelectronics |
1 / 18 page July 2007 Rev 4 1/18 1 STHS4257A, STHS4257A1 STHS4257L, STHS4257L1 IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor 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 25k Ω 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 Applications ■ Voice over IP (VoIP) phones ■ Web cameras ■ WLAN access points ■ Internet appliances ■ POS terminals ■ RFID readers DFN8 3mm x 3mm (DB) SO8 (M) 8 1 Table 1. Device options Order code Signature disable UVLO threshold, rising (V) UVLO threshold, falling (V) Protection mode Thermal overload protection Inrush current limit (mA, typ) Normal operation current limit (mA, typ) STHS4257A 39.2 30.5 Auto 2 steps 350/188 (1) STHS4257A1 ✔ 36.0 30.5 Auto 1 step 140 375 STHS4257L 39.2 30.5 Latch 2 steps 350/188 (1) STHS4257L1 ✔ 36.0 30.5 Latch 1 step 140 375 1. Current limit is common for both modes and gets reduced only in case of thermal overload. See Table 5: Electrical parameters. www.st.com Obsolete Product(s) - Obsolete Product(s) |
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