參數資料
型號： STHS4257A
廠商： 意法半導體
英文描述： IEEE 802.3af PoE Powered Device (PD) Interface Controller with Integrated Signature Resistor(集成識別電阻的IEEE802.3af PoE PD 接口控制器)
中文描述： IEEE 802.3af標準的PoE供電設備（PD）接口控制器，它集成簽名電阻（集成識別電阻的IEEE802.3af標準PoE電源接口控制器）
文件頁數： 1/18頁
文件大?。?/td> 173K
代理商： STHS4257A
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
.
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相關代理商/技術參數
參數描述
STHS4257A1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor
STHS4257A1M6E 功能描述:熱插拔功率分布 ADV Analog RoHS:否 制造商:Texas Instruments 產品:Controllers & Switches 電流限制: 電源電壓-最大:7 V 電源電壓-最小:- 0.3 V 工作溫度范圍: 功率耗散: 安裝風格:SMD/SMT 封裝 / 箱體:MSOP-8 封裝:Tube
STHS4257A1M6F 功能描述:開關變換器、穩(wěn)壓器與控制器 STHS4257A STHS4257A1 RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel
STHS4257L 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor
STHS4257L1 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor
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