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PDF STHS2375A Data sheet ( Hoja de datos )
| Número de pieza | STHS2375A | |
| Descripción | IEEE 802.3af PoE Powered Device (PD) interface controller | |
| Fabricantes | STMicroelectronics | |
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STHS2375A, STHS2375L, STHS2376A,
STHS2376L, STHS2377A, STHS2377L
IEEE 802.3af PoE Powered Device (PD) interface controller
www.datasheet4u.com
Features
■ IEEE 802.3af-compliant interface for Powered
Devices (PDs)
■ Integrated 100V, 500mA power MOSFET
■ Resistor-programmable inrush current limit
■ Normal operation current limit 460mA
■ External 25kΩ signature resistor
■ Resistor-programmable classification current
(Class 0-4)
■ Power Good output (active-high), open drain
■ Undervoltage Lockout (UVLO) - standard,
programmable, and legacy (see Table 1)
■ Thermal overload protection
■ Latch (L) or auto-retry (A) after hard current
overload or repetitive thermal overload
■ Industrial temperature range: –40 to +85°C
■ 8-pin SO and 8-pin TSSOP packages
■ RoHS compliant
8
1
SO8 (M)
TSSOP8 (DW)
Applications
■ Voice over IP (VOIP) phones
■ Web cameras
■ WLAN access points
■ Internet appliances
■ POS terminals
■ RFID readers
Table 1. Device options
Order code
External
signature
resistor (1%)
UVLO
UVLO
threshold,
rising (V)
UVLO
threshold,
falling (V)
STHS2375A
STHS2375L
STHS2376A
STHS2376L
STHS2377A
STHS2377L
24.9kΩ
24.9kΩ
24.9kΩ
24.9kΩ
24.9kΩ
24.9kΩ
Standard
Standard
Programmable
Programmable
Legacy
Legacy
39.3
39.3
2.49
2.49
35.1
35.1
30.5
30.5
1.93
1.93
30.5
30.5
Protection
mode
Auto
Latch
Auto
Latch
Auto
Latch
July 2007
Rev 4
1/20
www.st.com
1
1 page  
STHS237x
1 Summary description
Summary description
www.datasheet4u.com
The STHS237x is an IEEE802.3af-compliant family of interface controllers for Power over
Ethernet (PoE) Powered Device (PD) applications. The devices consist of two main
sections:
● The IEEE802.3af interface to the PoE powered RJ-45 wall socket, and
● the Hot Swap Controller (HSC) functions required to protect the PD during insertion,
operation, and withdrawal from the RJ-45 socket.
These devices have an integrated high voltage power MOSFET (low-side switch) with low
RDS ON and the capability to accept transients as high as 100V. Since the pins (such as VDD
and VSS) which interface to the RJ-45 socket can routinely see high peak voltages in excess
of 100V, it is strongly recommended that board designers protect the PD device with a
transient voltage suppressor, such as the SMAJ58A (available from STMicroelectronics),
connected between the VDD and VSS pins (see Figure 4 on page 8).
The IEEE802.3af-compliant interface includes the basic PD Detection and Classification
functions, whereas the 'Hot Swap' functions include other basic features, such as Inrush
Current Limiting, Undervoltage Lockout (UVLO), and Thermal Overload Protection. All of the
devices include an open drain Power Good (PG) signal to indicate normal steady operation
(see Figure 1 on page 6 and Table 2 on page 6). The STHS237x family also incorporates a
voltage offset (two series diodes) to accommodate the input diode bridge used to make the
PD polarity insensitive.
The STHS237x family comprises devices for all the UVLO limits configurations: IEEE
standard compliant (STHS2375), programmable (STHS2376) and for legacy systems
(STHS2377). See Table 1 on page 1.
Each of the basic part types, the STHS2375, STHS2376 and the STHS2377, is available
either with Latched Operation (L) Mode or with Automatic Retry (A) Mode after fault
conditions. For product options overview see Table 1 on page 1.
5/20
5 Page 
STHS237x
Absolute maximum ratings STHS237xA, STHS237xL
2 Absolute maximum ratings STHS237xA, STHS237xL
www.datasheet4u.com
Stressing the device above the rating listed in Table 4: Absolute maximum ratings may
cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in the Operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability. Refer also to the STMicroelectronics SURE
Program and other relevant quality documents.
Over the full operating temperature range, unless otherwise noted. Voltages are referenced
to the VSS pin.
Table 4. Absolute maximum ratings
Symbol
Parameter
Value
Unit
Voltage
VVDD, VRTN
VDET, VPG (1)
VUVLO
VILIM (2)
VCLASS (2)
Current, sinking
–0.3 to 100
Voltage on the respective pins, referenced
to VSS pin
–0.3 to 90
–0.3 to10
–0.3 to 3
–0.3 to 12
V
V
V
V
V
IRTN
IPG
IDET
Current, sourcing
Current sunk by the respective pins
0 to 515
0 to 10
0 to 1
mA
mA
mA
ICLASS
IILIM
ESD
Current sourced by the respective pins
0 to 100
0 to 1
mA
mA
VHBM
VCDM
Temperature
ESD Capability, Human body model
2 kV
ESD Capability, Charged device model
500
V
TA
TJ
TSTG
TSLD
Operating ambient temperature range
Maximum junction temperature
Storage temperature
Lead solder temperature for 10 seconds,
lead-free lead finish (3)
–40 to 85
Internally
limited
–55 to 150
260
°C
°C
°C
°C
1. IRTN = 0
2. Voltage output, do not apply external voltage to the CLASS and ILIM pins.
3. Reflow at peak temperature of 260°C (total thermal budget not to exceed 245°C for more than
30 seconds).
11/20
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| Páginas | Total 20 Páginas | |
| PDF Descargar | [ Datasheet STHS2375A.PDF ] | |
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