STHS4257A, STHS4257A1 STHS4257L, STHS4257L1
IEEE 802.3af PoE Powered Device (PD) interface controller with integrated si...
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 Under
voltage 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 therm...