Datasheet > STHS4257L1DB6F

STHS4257L1DB6F

更新时间： 2024-11-07 14:36:07

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意法半导体 - STMICROELECTRONICS		/
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18页	194K
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数据手册

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STHS4257L1DB6F 数据手册

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

SO8 (M)

side switch

■ Inrush current limit

■ Normal operation current limit

■ Integrated 25kΩ signature resistor

■ Signature disable (STHS4257A1/L1)

DFN8 3mm x 3mm (DB)

■ Resistor-programmable classification current

(Class 0-4)

■ Power Good output, open drain

■ Undervoltage Lockout (UVLO)

Applications

■ Voice over IP (VoIP) phones

■ Web cameras

■ Thermal overload protection (two-step for the

STHS4257A/L)

■ WLAN access points

■ Internet appliances

■ POS terminals

■ 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

■ RFID readers

Table 1.

Device options

Signature

Normal

operation

current limit

Inrush

current limit

UVLO

threshold, threshold,

UVLO

Thermal

overload

protection

Protection

mode

Order code

disable

rising (V)

falling (V)

(mA, typ)

STHS4257A

STHS4257A1

STHS4257L

STHS4257L1

39.2

36.0

39.2

36.0

30.5

Auto

2 steps

1 step

2 steps

1 step

350/188 ⁽¹⁾

✔

140

375

Latch

350/188 ⁽¹⁾

140

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

12 3 4 5 6 7...18

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