STHS4257L1M6F datasheet, PDF - EEWORLD Datasheet

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STHS4257L1M6F: DescriptionSPECIALTY INTERFACE CIRCUIT, PDSO8, 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8; CategoryAnalog mixed-signal IC Drivers and interfaces; File Size154KB，18 Pages; ManufacturerSTMicroelectronics; Websitehttp://www.st.com/; Environmental Compliance

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STHS4257L1M6F Overview

SPECIALTY INTERFACE CIRCUIT, PDSO8, 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8

STHS4257L1M6F Parametric

Parameter Name	Attribute value
Is it Rohs certified?	conform to
Maker	STMicroelectronics
Parts packaging code	SOIC
package instruction	0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
Contacts	8
Reach Compliance Code	unknown
Interface integrated circuit type	INTERFACE CIRCUIT
JESD-30 code	R-PDSO-G8
length	4.9 mm
Nominal negative supply voltage	-48 V
Number of functions	1
Number of terminals	8
Maximum operating temperature	85 °C
Minimum operating temperature	-40 °C
Package body material	PLASTIC/EPOXY
encapsulated code	SOP
Package shape	RECTANGULAR
Package form	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED
Certification status	Not Qualified
Maximum seat height	1.75 mm
surface mount	YES
Temperature level	INDUSTRIAL
Terminal form	GULL WING
Terminal pitch	1.27 mm
Terminal location	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED
width	3.9 mm

STHS4257L1M6F Preview

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 25kΩ 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

SO8 (M)

DFN8 3mm x 3mm (DB)

Applications

■

Voice over IP (VoIP) phones

Web cameras

WLAN access points

Internet appliances

POS terminals

RFID readers

Table 1.

Device options

Order code

STHS4257A

✔

Signature

disable

t(s

39.2

36.0

39.2

)

UVLO

threshold,

rising (V)

UVLO

threshold,

falling (V)

30.5

Protection

mode

Thermal

overload

protection

2 steps

1 step

2 steps

1 step

Inrush

current limit

(mA, typ)

Normal

operation

current limit

(mA, typ)

Auto

Latch

350/188

(1)

140

350/188

(1)

140

375

STHS4257A1

STHS4257L

STHS4257L1

✔

36.0

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

Contents

STHS4257A, STHS4257A1, STHS4257L, STHS4257L1

Contents

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

Classification (R

CLASS

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Power supply (GND) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Signature disable input (SIGDISA) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Power Good output (PWRGD) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Negative power output (V

OUT

) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

1.2

IEEE802.3af PD power classes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

. . . . . . . . . 14

Package mechanical data . . . . . . . . . . . . . . . . . . . . . . .

. .

Part numbering . . . . . . . . . . . . . . . . . . . . . . . .

. . . . . . . . . . . . . . . . . 16

...

. . . . . . . . . . . . . . . . . . . . . . . . 17

Revision history . . . . . . . . . . . . . .

. .

-O

Electrical parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

2/18

STHS4257A, STHS4257A1, STHS4257L, STHS4257L1

List of tables

Table 1.

Table 2.

Table 3.

Table 4.

Table 5.

Table 6.

Table 7.

Table 8.

Table 9.

Device options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1

Signal names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

IEEE802.3af PD power classes and corresponding R

CLASS

values. . . . . . . . . . . . . . . . . . . 7

Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Electrical parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

SO8 – 8-lead plastic small outline, 150mils width, mechanical data. . . . . . . . . . . . . . . . . . 14

DFN8 – 8-lead dual flat no-lead outline, package mechanical data . . . . . . . . . . . . . . . . . . 15

Ordering information scheme . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Document revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

t(s

)

3/18

List of figures

STHS4257A, STHS4257A1, STHS4257L, STHS4257L1

List of figures

Figure 1.

Figure 2.

Figure 3.

Figure 4.

Figure 5.

Figure 6.

Figure 7.

Figure 8.

Figure 9.

Figure 10.

Logic diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Pin connections (STHS4257A/L, top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Pin connections (STHS4257A1/L1, top view) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

Application circuit overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Block diagram (STHS4257A/L). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9

Typical application circuit (STHS4257A/L) with a DC/DC converter. . . . . . . . . . . . . . . . . . . 9

Block diagram (STHS4257A1/L1). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Typical application circuit (STHS4257A1/L1) with a DC/DC converter. . . . . . . . . . . . . . . . 10

SO8 – 8-lead plastic small outline, 150mils width, mechanical drawing . . . . . . . . . . . . . . . 14

DFN8 – 8-lead dual flat no-lead outline, package mechanical drawing . . . . . . . . . . . . . . . 15

t(s

)

4/18

STHS4257A, STHS4257A1, STHS4257L, STHS4257L1

Summary description

The STHS4257 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

and the capability to accept transients as high as 100V. Since the pins (such as GND

and V

) 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 GND and V

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 (PWRGD) signal to indicate normal steady

operation (see

Figure 1 on page 6

and

Table 2 on page 6).

The STHS4257 family also

incorporates a 1.5V voltage offset (two series diodes) to accommodate the input diode

bridge used to make the PD polarity insensitive.

The STHS4257A1/L1 includes a dual level current limit circuit. This allows the

STHS4257A1/L1 to interface with legacy Power over Ethernet (LAN) systems while

maintaining compatibility with the current IEEE 802.3af specification.

Each of the two basic part types, the STHS4257A/L and the STHS4257A1/L1, 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.

t(s

)

5/18

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STHS4257L1M6F Related Products

	STHS4257L1M6F	STHS4257L1M6E	STHS4257A1M6E	STHS4257AM6E	STHS4257AM6F	STHS4257LM6E	STHS4257LM6F
Description	SPECIALTY INTERFACE CIRCUIT, PDSO8, 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	SPECIALTY INTERFACE CIRCUIT, PDSO8, 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	SPECIALTY INTERFACE CIRCUIT, PDSO8, 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	SPECIALTY INTERFACE CIRCUIT, PDSO8, 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	SPECIALTY INTERFACE CIRCUIT, PDSO8, 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	SPECIALTY INTERFACE CIRCUIT, PDSO8, 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	SPECIALTY INTERFACE CIRCUIT, PDSO8, 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
Is it Rohs certified?	conform to	conform to	conform to	conform to	conform to	conform to	conform to
Maker	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics	STMicroelectronics
Parts packaging code	SOIC	SOIC	SOIC	SOIC	SOIC	SOIC	SOIC
package instruction	0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8	0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
Contacts	8	8	8	8	8	8	8
Reach Compliance Code	unknown	unknown	unknown	unknown	unknown	unknown	unknown
Interface integrated circuit type	INTERFACE CIRCUIT	INTERFACE CIRCUIT	INTERFACE CIRCUIT	INTERFACE CIRCUIT	INTERFACE CIRCUIT	INTERFACE CIRCUIT	INTERFACE CIRCUIT
JESD-30 code	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8	R-PDSO-G8
length	4.9 mm	4.9 mm	4.9 mm	4.9 mm	4.9 mm	4.9 mm	4.9 mm
Nominal negative supply voltage	-48 V	-48 V	-48 V	-48 V	-48 V	-48 V	-48 V
Number of functions	1	1	1	1	1	1	1
Number of terminals	8	8	8	8	8	8	8
Maximum operating temperature	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C
Minimum operating temperature	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C
Package body material	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
encapsulated code	SOP	SOP	SOP	SOP	SOP	SOP	SOP
Package shape	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
Package form	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE	SMALL OUTLINE
Peak Reflow Temperature (Celsius)	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
Certification status	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
Maximum seat height	1.75 mm	1.75 mm	1.75 mm	1.75 mm	1.75 mm	1.75 mm	1.75 mm
surface mount	YES	YES	YES	YES	YES	YES	YES
Temperature level	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
Terminal form	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING	GULL WING
Terminal pitch	1.27 mm	1.27 mm	1.27 mm	1.27 mm	1.27 mm	1.27 mm	1.27 mm
Terminal location	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL	DUAL
Maximum time at peak reflow temperature	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
width	3.9 mm	3.9 mm	3.9 mm	3.9 mm	3.9 mm	3.9 mm	3.9 mm

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