STHS4257A datasheet(1/18 Pages) STMICROELECTRONICS

Part #	STHS4257A

Description	IEEE 802.3af PoE Powered Device (PD) interface controller with integrated signature resistor

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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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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