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STHS2375A, STHS2375L, STHS2376A, STHS2376L, STHS2377A, STHS2377L
IEEE 802.3af PoE Powered Device (PD) interface controller
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 25k 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 +85C 8-pin SO and 8-pin TSSOP packages RoHS compliant Device options
External signature resistor (1%) 24.9k 24.9k 24.9k 24.9k 24.9k 24.9k UVLO Standard Standard Programmable Programmable Legacy Legacy UVLO threshold, rising (V) 39.3 39.3 2.49 2.49 35.1 35.1
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.
Order code STHS2375A STHS2375L STHS2376A STHS2376L STHS2377A STHS2377L
UVLO threshold, falling (V) 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
Contents
STHS237x
Contents
1 Summary description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Pin descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
1.1.1 1.1.2 1.1.3 1.1.4 1.1.5 1.1.6 1.1.7 1.1.8 Current limit (ILIM) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Classification (CLASS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Detection resistor (DET) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Ground (VSS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Return (RTN) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Power Good output (PG) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7 Undervoltage Lockout Input (UVLO, STHS2376A/L only) . . . . . . . . . . . . 7 Power supply (VDD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
2 3 4 5 6
Absolute maximum ratings STHS237xA, STHS237xL . . . . . . . . . . . . . 11 Electrical parameters STHS237xA, STHS237xL . . . . . . . . . . . . . . . . . . 12 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15 Part numbering . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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STHS237x
List of figures
List of figures
Figure 1. Figure 2. Figure 3. Figure 4. Figure 5. Figure 6. Figure 7. Figure 8. Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 STHS2375A/L, STHS2377A/L pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . 6 STHS2376A/L pin connections (top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 Application circuit overview (STHS2375A/L, STHS2377A/L) . . . . . . . . . . . . . . . . . . . . . . . . 8 STHS237xA block diagram. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 STHS237xL block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10 SO8 - 8-lead plastic small outline, 150 mils width, package outline. . . . . . . . . . . . . . . . . . 16 TSSOP8 - 8-lead, thin shrink small outline, 3x4.4mm, package outline . . . . . . . . . . . . . . 17
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List of tables
STHS237x
List of tables
Table 1. Table 2. Table 3. Table 4. Table 5. Table 6. Table 7. Table 8. Table 9. Table 10. Device options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 IEEE802.3af PD power classes and corresponding RCLASS values. . . . . . . . . . . . . . . . . . . 8 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Electrical parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12 DC characteristics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13 SO8 - 8-lead plastic small outline, 150 mils width, package mechanical data . . . . . . . . . . 16 TSSOP8 - 8-lead, thin shrink small outline, 3x4.4mm, package mechanical data. . . . . . . 17 Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
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STHS237x
Summary description
1
Summary description
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.
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Summary description Figure 1. Logic diagram
VDD UVLO(1) ILIM CLASS DET VSS STHS2375A/L STHS2376A/L STHS2377A/L PG RTN
STHS237x
AI12241
1. STHS2376A/L devices only.
Table 2.
Pin 1 2 3 4 5 6 7 8
Signal names
Symbol ILIM CLASS DET VSS RTN PG UVLO VDD
(1)
Description Inrush Current Limit resistor Classification resistor Powered Device Detection resistor Ground on the input side; return power line to PSE Return power output, negative rail Power Good Output, open drain, active-high (referenced to RTN) Programmable Undervoltage Lockout input pin Positive Power Supply; common input/output power rail
1. STHS2376A/L devices only, for other part types No Connect.
Figure 2.
STHS2375A/L, STHS2377A/L pin connections (top view)
ILIM CLASS DET VSS 1 2 3 4 8 7 6 5 VDD NC PG RTN
AI12238
Figure 3.
STHS2376A/L pin connections (top view)
ILIM CLASS DET VSS 1 2 3 4 8 7 6 5 VDD UVLO PG RTN
AI12239
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STHS237x
Summary description
1.1
1.1.1
Pin descriptions
Current limit (ILIM)
Connect a resistor between ILIM and VSS to set the start-up inrush current limit. ILIM = 25 000/RILIM [A]. Practical values of RILIM are between 62.5k and 500k. RILIM = 178k for inrush current of 140mA for compatibility with legacy PSEs. Do not leave open or connect to VSS.
1.1.2
Classification (CLASS)
Connect a Classification resistor between this pin and VSS to tell the PSE which power class will be connected. Do not connect this pin directly to VSS. For classification resistor values, see Table 3 on page 8.
1.1.3
Detection resistor (DET)
Connect a 24.9k resistor between DET and VDD to allow the PSE to detect the Powered Device properly.
1.1.4
Ground (VSS)
This is the return power line on the PSE side (negative).
1.1.5
Return (RTN)
This is the return power output on the load side, negative rail.
1.1.6
Power Good output (PG)
This pin indicates that the STHS power MOSFET is fully on and works in normal operation mode (Power Good). Open drain, high impedance means that the power is good; in all other cases, the impedance is low (referenced to RTN).
1.1.7
Undervoltage Lockout Input (UVLO, STHS2376A/L only)
Connect the tap of the resistor divider between VDD and VSS to set the UVLO voltage limits (see Figure 6 on page 10). Note: STHS2376A/L only, for all other devices, this is No Connect.
1.1.8
Power supply (VDD)
This is the Power Input/Output, positive rail.
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Summary description Table 3.
Class 0 1 2 3 4
STHS237x IEEE802.3af PD power classes and corresponding RCLASS values
Usage Default Optional Optional Optional Reserved Max. Power at Input of PD (W) 0.44 to 12.95 0.44 to 3.84 3.84 to 6.49 6.49 to 12.95 Reserved(1) Classification Load Current Limits (mA) 0-4 9-12 17-20 26-30 36-44 RCLASS Resistor (, 1%) 4420 953 549 357 255
1. Class 4 is currently reserved and should not be used.
Figure 4.
Application circuit overview (STHS2375A/L, STHS2377A/L)
RJ-45
TX Pair
Data to Ethernet Physical Layer Device
2x DF01S
RDET 24.9k, 1%
DET SMAJ58A C1 0.1F, 100V
VDD
100 k PG + C2 100F, 100V RTN To DC/DC Converter
STHS2375A/L STHS2377A/L
ILIM
Spare Pair Spare Pair
RILIM
CLASS VSS
RCLASS
RX Pair
Data to Ethernet Physical Layer Device
AI12240a
Note:
This configuration uses either data wires or spare wires for DC power.
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STHS237x Figure 5. STHS237xA block diagram
Summary description
3 12V VDD 8 + - Classification Comparator 22V + PG Comparator - 1.5V & 10V + - Delay 150s 6 10V Regulator 2 Detection Comparator
DET
CLASS
PG
S R
Q
1 = Inrush
2.5V
+ -
UVLO Comp. Thermal Shutdown 1 = Limiting 1:1 Normal Oper. 1 Ref. 0 + - EN Current Limit Amp. 5 RTN
UVLO(1)
7 + -
Current Mirror 2.5V
ILIM VSS
1 4
0.1
AI12245a
1. STHS2376A/L devices only. The UVLO comparator is connected directly to the UVLO input pin instead of the internal UVLO divider. For all other devices, pin 7 is NC (No Connect).
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Summary description Figure 6. STHS237xL block diagram
STHS237x
3 12V VDD 8 + - Classification Comparator 22V + PG Comparator - 1.5V & 10V + - Delay 150s 6 10V Regulator 2 Detection Comparator
DET
CLASS
PG
S R
Q
R 0 = Inrush S Q
0 = Fault
2.5V
+ -
UVLO Comp. Thermal Shutdown, Counter, and Latch 1 = Limiting 1:1 Normal Oper. 1 Ref. 0 + - EN Current Limit Amp. 5 RTN
(1) UVLO
7 + -
Current Mirror 2.5V
ILIM
1
VSS 4
0.1
AI12246a
1. STHS2376A/L devices only. The UVLO comparator is connected directly to the UVLO input pin instead of the internal UVLO divider. For all other devices, pin 7 is NC (No Connect).
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STHS237x
Absolute maximum ratings STHS237xA, STHS237xL
2
Absolute maximum ratings STHS237xA, STHS237xL
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 Voltage VVDD, VRTN VDET, VPG VUVLO VILIM
(2) (2) (1)
Parameter
Value
Unit
-0.3 to 100 -0.3 to 90 Voltage on the respective pins, referenced to VSS pin -0.3 to10 -0.3 to 3 -0.3 to 12
V V V V V
VCLASS
Current, sinking IRTN IPG IDET Current, sourcing ICLASS IILIM ESD VHBM VCDM Temperature 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 ESD Capability, Human body model ESD Capability, Charged device model 2 500 kV V Current sourced by the respective pins 0 to 100 0 to 1 mA mA Current sunk by the respective pins 0 to 515 0 to 10 0 to 1 mA mA mA
1. IRTN = 0 2. Voltage output, do not apply external voltage to the CLASS and ILIM pins. 3. Reflow at peak temperature of 260C (total thermal budget not to exceed 245C for more than 30 seconds).
11/20
Electrical parameters STHS237xA, STHS237xL
STHS237x
3
Electrical parameters STHS237xA, STHS237xL
Specifications common for all the STHS237xA/L product family unless otherwise noted. VDD = 48V, RDET = 24.9k, RCLASS = 255, RILIM = 178k, TJ= -40 to 125C, unless otherwise noted, typical values at 25C. For the STHS2376x VUVLO = 0V for classification and VUVLO = 5V otherwise. Voltages are referenced to the VSS pin unless otherwise noted. Positive currents are into pins. Table 5.
Symbol
Electrical parameters
Parameter Test conditions Min Typ Max Units
Recommended operating conditions VDD, PG, RTN Input voltage range UVLO Operating current range (sinking) Classification resistor (1), (2) Inrush current limit programming resistor (2) Sinking current Operating junction temperature PG = low 0 0 255 5 450 4420 V mA 0 57 V
IRTN RCLASS
RTN CLASS
RILIM IPG(SINK) TJ
62.5 0 -40
500 10 125
k mA C
TA
Operating free-air temperature
-40
85
C
1. Classification tested with exact resistor values. A 1% tolerance of classification resistor values is sufficient for compliance with IEEE 802.3af classification current limits. 2. Do not apply external voltage to the CLASS and ILIM pins.
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STHS237x Table 6.
Symbol Detection Offset current Sleep current IIL(DET) IDET Classification
Electrical parameters STHS237xA, STHS237xL DC characteristics
Parameter Test conditions Min Typ Max Unit
DET open, VVDD = VRTN = 1.9V, measure IVDD + IRTN DET open, VVDD = VRTN = 10.1V, measure IVDD + IRTN
0.3 4 0.1 53.7 395 56 410
3 12 5 58.3 417
A A A A A
DET pin leakage current VDET = VVDD = 57V, measure IDET Detection current VRTN = VVDD, RDET = 24.9k, VVDD = 1.4V measure IVDD + IRTN + IDET VVDD = 10.1V
RCLASS = 4420, VVDD = 13 to 21V RCLASS = 953, VVDD = 13 to 21V ICLASS Classification current(1) RCLASS = 549, VVDD = 13 to 21V RCLASS = 357, VVDD = 13 to 21V RCLASS = 255, VVDD = 13 to 21V VCL(ON) VCU(OFF) VCU(H) IIL(CLASS) Pass device RDS(ON) IRTN(L) ILIM(N) ILIM(I) On resistance RTN pin leakage current Normal operation current limit Inrush mode current limit Inrush current termination(2) Current rise time to inrush(3) IIL(ILIM) IRTN = 300mA VVDD = VRTN = 30V (VUVLO = 0V for STHS2376x) VRTN = 1V VRTN = 2V, RILIM = 178k VRTN falling, RILIM = 178k, inrush mode to normal operation mode RILIM = 69.8k, VRTN-VSS = 5V, IRTN = 30 300mA, VVDD increasing past upper UVLO CLASS pin leakage current Classification lower threshold Classification upper threshold Regulator turns on, VVDD rising Regulator turns off, VVDD rising Hysteresis VCLASS = 0V, VVDD = 57V
2.2
2.4
2.8 11.3 19.5 29.5 41.2 13.0 23 1 1
mA mA mA mA mA V V V A
10.3 10.6 17.7 18.3 27.1 28.0 38.0 39.4 10.2 11.3 21 0.5 21.9 0.78
0.72
1.0 15
A mA mA % s
405 100 85 15
461 130 91 34
515 180 100
ILIM pin leakage current VVDD = 15V, VUVLO = 0V
1
A
Power Good (PG) VRTN(LO R) RTN latch off voltage, rising(4) VRTN rising 9.5 10.0 10.5 V
13/20
Electrical parameters STHS237xA, STHS237xL Table 6.
Symbol
STHS237x
DC characteristics (continued)
Parameter PG deglitch Test conditions Delay rising and falling PG IPG = 2mA, VRTN = 34V, VVDD = 38V, VRTN falling IPG = 2mA, VRTN = 0V, VVDD = 25V, for STHS2376x VUVLO = 0V PG pin leakage current VVDD = VPG = 57V, VRTN = 0V Min 75 Typ 150 0.12 0.12 0.1 Max 225 0.4 0.4 1 Unit s V V A
VPG(OL)
Output low voltage
IOL(PG)
Undervoltage lockout (UVLO) VUVLO(R) VUVLO(F) VUVLO(H) VUVL(R) VUVLO(F) VUVLO(H) VUVLO(R) VUVLO(F) VUVLO(H) IIL(UVLO) UVLO pin leakage current (STHS2376x only) UVLO Thresholds, STHS2377x UVLO Thresholds, STHS2376x UVLO Thresholds, STHS2375x Voltage at VDD pin, VVDD rising Voltage at VDD pin, VVDD falling Hysteresis Voltage at UVLO pin, VUVLO rising Voltage at UVLO pin, VUVLO falling Hysteresis Voltage at VDD pin, VVDD rising Voltage at VDD pin, VVDD falling Hysteresis VUVLO = 0 to 5V 38.4 39.3 29.6 30.5 8.3 8.8 40.4 31.5 9.1 2.57 1.98 0.58 36.0 31.4 4.8 1 V V V V V V V V V A
2.43 2.49 1.87 1.93 0.53 0.56 34.1 35.1 29.7 30.5 4.3 -1 4.5
Thermal shutdown TSHUTDOWN Shutdown temperature(3), temperature rising 140 20 C C
TSHUTDOWN H Hysteresis(3) Supply current IDD Operating current
250
450
A
1. Classification tested with exact resistor values. A 1% tolerance of classification resistor values is sufficient for compliance with IEEE 802.3af classification current limits. 2. Percentage of the intial steady state RTN inrush current value, below which inrush is terminated and PG goes active. 3. Not tested in production. 4. Gradually increase VRTN from 0V until IRTN disappears.
14/20
STHS237x
Package mechanical data
4
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second Level Interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
15/20
Package mechanical data Figure 7.
STHS237x
SO8 - 8-lead plastic small outline, 150 mils width, package outline
h x 45 A2 B e D A C ddd
8
E
1
H A1 L
SO-A
Note:
Drawing is not to scale. Table 7. SO8 - 8-lead plastic small outline, 150 mils width, package mechanical data
mm Symb Typ A A1 B C D ddd E e H h L N - - - - - - - 1.27 - - - - Min 1.35 0.10 0.33 0.19 4.80 - 3.80 - 5.80 0.25 0.40 0 8 Max 1.75 0.25 0.51 0.25 5.00 0.10 4.00 - 6.20 0.50 0.90 8 Typ - - - - - - - 0.050 - - - - Min 0.053 0.004 0.013 0.007 0.189 - 0.150 - 0.228 0.010 0.016 0 8 Max 0.069 0.010 0.020 0.010 0.197 0.004 0.157 - 0.244 0.020 0.035 8 inches
16/20
STHS237x Figure 8.
Package mechanical data TSSOP8 - 8-lead, thin shrink small outline, 3x4.4mm, package outline
D
8
5
c
E1 E
1
4
A1 A CP b e A2
L L1
TSSOP8AM
Note:
Drawing is not to scale. Table 8. TSSOP8 - 8-lead, thin shrink small outline, 3x4.4mm, package mechanical data
mm Symb Typ A A1 A2 b c CP D e E E1 L L1 N 8 3.000 0.650 6.400 4.400 0.600 1.000 0 8 8 2.900 - 6.200 4.300 0.450 1.000 0.050 0.800 0.190 0.090 Min Max 1.200 0.150 1.050 0.300 0.200 0.100 3.100 - 6.600 4.500 0.750 0.1181 0.0256 0.2520 0.1732 0.0236 0.0394 0 8 0.1142 - 0.2441 0.1693 0.0177 0.0394 0.0020 0.0315 0.0075 0.0035 Typ Min Max 0.0472 0.0059 0.0413 0.0118 0.0079 0.0039 0.1220 - 0.2598 0.1772 0.0295 inches
17/20
Part numbering
STHS237x
5
Part numbering
Table 9.
Example:
Ordering information scheme
STHS 2375A M 6 F
Device type STHS
Product options 2375A = Standard UVLO, Auto 2375L = Standard UVLO, Latch 2376A = Programmable UVLO, Auto 2376L = Programmable UVLO, Latch 2377A = Legacy UVLO, Auto 2377L = Legacy UVLO, Latch
Package M = SO8 (150mils width) DW (1) = TSSOP8 3x4.4mm
Temperature range 6 = -40 to 85C
Shipping method F = ECOPACK Package, Tape & Reel E = ECOPACK Package, Tube
1. Contact local ST sales office for availability.
For other options, or for more information on any aspect of this device, please contact the ST Sales Office nearest you.
18/20
STHS237x
Revision history
6
Revision history
Table 10.
Date 11-Aug-2006 19-Dec-2006 24-May-2007 26-Jul-2007
Document revision history
Revision 1 2 3 4 Initial release. Updated Features and Table 4. Formatting changes, updated Table 1, 4, 5, 6. Document status upgraded to full datasheet, updated cover page and Table 9. Changes
19/20
STHS237x
Please Read Carefully:
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