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STMicroelectronics Electronic Components Datasheet

STHS4257A Datasheet

IEEE 802.3af PoE Powered Device (PD) interface controller

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STHS4257A pdf
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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
8
1
SO8 (M)
Inrush current limit
Normal operation current limit
Integrated 25kΩ signature resistor
)Signature disable (STHS4257A1/L1)
t(sResistor-programmable classification current
c(Class 0-4)
duPower Good output, open drain
roUndervoltage Lockout (UVLO)
PThermal overload protection (two-step for the
teSTHS4257A/L)
leLatch (L) or auto-retry (A) after repetitive
sothermal overload
bIndustrial temperature range: –40 to +85°C
- OSO8 and DFN8 (3mm x 3mm) packages
)RoHS compliant
DFN8 3mm x 3mm (DB)
Applications
Voice over IP (VoIP) phones
Web cameras
WLAN access points
Internet appliances
POS terminals
RFID readers
duct(sTable 1. Device options
lete ProOrder code
Signature
disable
UVLO
threshold,
rising (V)
soSTHS4257A
ObSTHS4257A1
39.2
36.0
UVLO
threshold,
falling (V)
30.5
30.5
Protection
mode
Thermal
overload
protection
Inrush
current limit
(mA, typ)
Normal
operation
current limit
(mA, typ)
Auto
2 steps
350/188 (1)
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.
July 2007
Rev 4
1/18
www.st.com
1


STMicroelectronics Electronic Components Datasheet

STHS4257A Datasheet

IEEE 802.3af PoE Powered Device (PD) interface controller

No Preview Available !

STHS4257A pdf
Contents
Contents
STHS4257A, STHS4257A1, STHS4257L, STHS4257L1
1
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Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1.1
1.1.2
1.1.3
Classification (RCLASS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Power supply (GND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1.4 Signature disable input (SIGDISA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1.5 Power Good output (PWRGD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1.6 Negative power output (VOUT) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.2 IEEE802.3af PD power classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
ct(s)3 Electrical parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
rodu4 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
te P5 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
Obsolete Product(s) - Obsole6 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
2/18


Part Number STHS4257A
Description IEEE 802.3af PoE Powered Device (PD) interface controller
Maker STMicroelectronics
Total Page 18 Pages
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