FeAtures

n

LTC4266A/LTC4266C

Quad PoE/PoE+/LTPoE++

PSE Controller

Description

The

LTC

®

4266A

is a quad power sourcing equipment (PSE)

controller capable of delivering up to 90W of LTPoE++

power to a compatible LTPoE++ powered device (PD). A

proprietary detection/classification scheme allows mutual

identification between a LTPoE++ PSE and LTPoE++ PD

while remaining compatible and interoperable with exist-

ing Type 1 (13W) and Type 2 (25.5W) PDs. The LTC4266A

feature set is a superset of the popular LTC4266. These

PSE controllers feature low R

ON

external MOSFETs and

0.25Ω sense resistors which are especially important at

the LTPoE++ current levels to maintain the lowest possible

heat dissipation.

The LTC4266C targets fully automatic PSE systems pow-

ering Type 1 (up to 13W) PDs.

Advanced power management features include: 14-bit

current monitoring ADCs, DAC-programmable current

limit, and versatile quick shutdown of preselected ports.

Advanced power management host software is available

under a no-cost license. PD discovery uses a proprietary

dual-mode 4-point detection mechanism ensuring excel-

lent immunity from false PD detection. The LTC4266

includes an I

2

C serial interface operable up to 1MHz.

The LTC4266 is available in multiple power grades allow-

ing delivered PD power of 13W, 25.5W, 38.7W, 52.7W,

70W and 90W. These controllers are available in a 38-lead

5mm × 7mm QFN package.

n

Four Independent PSE Channels

Compliant with IEEE 802.3at Type 1 and 2

Low Power Dissipation

n

0.25Ω Sense Resistance Per Channel

Very High Reliability 4-Point PD Detection

n

2-Point Forced Voltage

n

2-Point Forced Current

High Capacitance Legacy Device Detection

1MHz I

2

C Compatible Serial Control Interface

Midspan Backoff Timer

Supports 2-Pair and 4-Pair Output Power

Available in Multiple Power Grades

n

LTC4266A-1: LTPoE++™ 38.7W

n

LTC4266A-2: LTPoE++ 52.7W

n

LTC4266A-3: LTPoE++ 70W

n

LTC4266A-4: LTPoE++ 90W

n

LTC4266C: PoE 13W

Available in 38-Lead 5mm × 7mm QFN Package

ApplicAtions

n

LTPoE++ PSE Switches/Routers

LTPoE++ PSE Midspans

IEEE 802.3at Type 1 PSE Switches/Routers

IEEE 802.3at Type 1 PSE Midspans

L,

LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and

LTPoE++ and ThinSOT are trademarks of Analog Devices, Inc. All other trademarks are the

property of their respective owners.

typicAl ApplicAtion

3.3V

10Ω

V

DD

DGND

AGND

Complete 4-Port Ethernet High Power Source

AD0 AD1 AD2 AD3

SHDN1 SHDN2 SHDN3 SHDN4

AUTO

MSD RESET

MID SDAIN SCL

SDAOUT

INT

+

SMAJ5.0A

0.1µF

10µF

10Ω

SMAJ58A

LTC4266

0.22µF 100V

×4

S1B

×4

S1B

×4

–54V

C

BULK

–54V

+

V

EE

SENSE1 GATE1 OUT1 SENSE2 GATE2 OUT2 SENSE3 GATE3 OUT3 SENSE4 GATE4 OUT4

1µF

100V

PORT1

PORT2

PORT3

PORT4

4266AC TA01

TVSBULK

4266acfe

For more information

www.linear.com/LTC4266A

1

LTC4266A/LTC4266C

Absolute MAxiMuM rAtings

Supply Voltages (Note 1)

AGND – V

EE

........................................... –0.3V to 80V

DGND – V

EE

........................................... –0.3V to 80V

V

DD

– DGND ......................................... –0.3V to 5.5V

Digital Pins

SCL, SDAIN, SDAOUT,

INT, SHDNn, MSD,

ADn,

RESET,

AUTO, MID........... DGND –0.3V to V

DD

+ 0.3V

Analog Pins

GATEn, SENSEn, OUTn .......... V

EE

–0.3V to V

EE

+ 80V

Operating Temperature Range

LTC4266I .............................................–40°C to 85°C

Junction Temperature (Note 2) ............................. 125°C

Storage Temperature Range .................. –65°C to 150°C

Lead Temperature (Soldering, 10 sec)................... 300°C

pin conFigurAtion

TOP VIEW

RESET

AUTO

OUT1

31 GATE1

30 SENSE1

29 OUT2

28 GATE2

27 SENSE2

V

EE

39

26 V

EE

25 V

EE

24 OUT3

23 GATE3

22 SENSE3

21 OUT4

20 GATE4

13 14 15 16 17 18 19

SHDN1

SHDN2

SHDN3

SHDN4

AGND

SENSE4

V

DD

MSD

MID

SCL

SDAOUT 1

NC 2

SDAIN 3

AD3 4

AD2 5

AD1 6

AD0 7

DNC 8

NC 9

DGND 10

NC 11

NC 12

INT

38 37 36 35 34 33 32

UHF PACKAGE

38-LEAD (5mm

×

7mm) PLASTIC QFN

EXPOSED PAD IS V

EE

(PIN 39) MUST BE SOLDERED TO PCB

T

JMAX

= 125°C,

θ

JA

= 34°C/W

orDer inForMAtion

LEAD FREE FINISH

LTC4266CIUHF#PBF

LTC4266AIUHF-1#PBF

LTC4266AIUHF-2#PBF

LTC4266AIUHF-3#PBF

LTC4266AIUHF-4#PBF

TAPE AND REEL

LTC4266CIUHF#TRPBF

LTC4266AIUHF-1#TRPBF

LTC4266AIUHF-2#TRPBF

LTC4266AIUHF-3#TRPBF

LTC4266AIUHF-4#TRPBF

http://www.linear.com/product/LTC4266A#orderinfo

PART MARKING*

4266C

4266A1

4266A2

4266A3

4266A4

PACKAGE DESCRIPTION

38-Lead (5mm × 7mm) Plastic QFN

MAX PWR

13W

38.7W

52.7W

70W

90W

TEMPERATURE RANGE

–40°C to 85°C

Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.

Consult LTC Marketing for information on non-standard lead based finish parts.

For more information on lead free part marking, go to:

http://www.linear.com/leadfree/

For more information on tape and reel specifications, go to:

http://www.linear.com/tapeandreel/.

Some packages are available in 500 unit reels through

designated sales channels with #TRMPBF suffix.

2

4266acfe

For more information

www.linear.com/LTC4266A

LTC4266A/LTC4266C

electricAl chArActeristics

SYMBOL

V

EE

PARAMETER

Main PoE Supply Voltage

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. AGND – V

EE

= 54V, AGND = DGND, and V

DD

– DGND = 3.3V

unless otherwise noted. (Notes 3, 4)

CONDITIONS

AGND – V

EE

For IEEE Type 1 Compliant Output

For IEEE Type 2 Compliant Output

For LTPoE++ Compliant Output

AGND – V

EE

V

DD

– DGND

DGND – V

EE

(AGND – V

EE

) = 55V

(V

DD

– DGND) = 3.3V

First Point, AGND – V

OUTn

= 9V

Second Point, AGND – V

OUTn

= 3.5V

AGND – V

OUTn

, 5µA ≤ I

OUTn

≤ 500µA

First Point

Second Point

AGND – V

OUTn

= 0V

AGND – V

OUTn

, Open Port

AGND – V

OUTn

, C

PORT

= 0.15µF

l

MIN

45

51

54.75

20

3.0

25

TYP

MAX

57

UNITS

V

mA

µA

V

mA

V

V/µs

kΩ

V

mA

V

mA

Undervoltage Lockout

V

DD

V

DD

Supply Voltage

Undervoltage Lockout

Allowable Digital Ground Offset

I

EE

I

DD

Detection

Detection Current – Force Current

Detection Voltage – Force Voltage

V

EE

Supply Current

V

DD

Supply Current

25

3.3

2.2

30

4.3

57

–2.4

1.1

220

140

7

3

240

160

8

4

0.8

10.4

15.5

27.5

16.0

53

5.5

13.5

21.5

31.5

45.2

7.5

53

0.4

0.08

8

2

300

61

6.5

14.5

23

33

48

9

61

17

29.7

–5

3

260

180

9

5

0.9

12

0.01

18.5

32

20.5

67

7.5

15.5

24.5

34.9

50.8

10

67

l

Detection Current Compliance

V

OC

Detection Voltage Compliance

Detection Voltage Slew Rate

Minimum Valid Signature Resistance

Maximum Valid Signature Resistance

Classification

V

CLASS

Classification Voltage

Classification Current Compliance

Classification Threshold Current

AGND – V

OUTn

, 0mA ≤ I

CLASS

≤ 50mA

V

OUTn

= AGND

Class 0 – 1

Class 1 – 2

Class 2 – 3

Class 3 – 4

Class 4 – Overcurrent

AGND – V

OUTn

, 0.1mA ≤ I

CLASS

≤ 10mA

V

OUTn

= AGND

Port Off, V

GATEn

= V

EE

+ 5V

Port Off, V

GATEn

= V

EE

+ 1V

V

GATEn

= V

EE

+ 5V

V

GATEn

– V

EE

, I

GATEn

= 1µA

V

OUTn

– V

EE

0V ≤ (AGND – V

OUTn

) ≤ 5V

l

V

MARK

Gate Driver

Classification Mark State Voltage

Mark State Current Compliance

GATE Pin Pull-Down Current

GATE Pin Fast Pull-Down Current

GATE Pin On Voltage

l

0.12

30

12

2.4

500

14

2.8

700

l

V

kΩ

Output Voltage Sense

V

PG

Power Good Threshold Voltage

OUT Pin Pull-Up Resistance to AGND

l

4266acfe

For more information

www.linear.com/LTC4266A

3

LTC4266A/LTC4266C

electricAl chArActeristics

SYMBOL

V

CUT

PARAMETER

Overcurrent Sense Voltage

Current Sense

V

SENSEn

– V

EE

hpen = 0Fh, cutn[5:0] ≥ 4 (Note 12)

cutrng = 0

cutrng = 1

Class 0, Class 3

Class 1

Class 2

Class 4

V

SENSEn

– V

EE

, hpen = 0Fh, limn = 80h,

V

EE

= 55V (Note 12)

V

EE

< V

OUT

< AGND – 29V

AGND – V

OUT

= 0V

hpen = 0Fh, limn = C0h, V

EE

= 55V

V

OUT

– V

EE

= 0V to 10V

V

EE

+ 23V < V

OUT

< AGND – 29V

AGND – V

OUT

= 0V

V

OUT

– V

EE

= 0V to 10V, V

EE

= 55V

Class 0 to Class 3

Class 4

V

SENSEn

– V

EE

, rdis = 0

V

SENSEn

– V

EE

, rdis = 1

V

SENSEn

– V

EE

– V

LIM

, rdis = 0

V

SENSEn

– V

EE

– V

LIM

, rdis = 1

No Missing Codes, fast_iv = 0

V

SENSEn

– V

EE

(Note 7)

No Missing Codes, fast_iv = 0

AGND – V

OUTn

(Note 7)

ADn,

RESET, MSD, SHDNn,

AUTO, MID

(Note 6)

SCL, SDAIN (Note 6)

(Note 6)

I

SDAOUT

= 3mA, I

INT

= 3mA

I

SDAOUT

= 5mA, I

INT

= 5mA

ADn,

SHDNn, RESET, MSD

AUTO, MID

l

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. AGND – V

EE

= 54V, AGND = DGND, and V

DD

– DGND = 3.3V

unless otherwise noted. (Notes 3, 4)

CONDITIONS

MIN

TYP

MAX

UNITS

l

9

4.5

90

26

49

152

9.38

4.69

94

28

52

159

9.75

4.88

98

30

55

166

mV/LSB

mV

Overcurrent Sense in AUTO Pin Mode

V

LIM

Active Current Limit in 802.3af Compliant

Mode

l

102

20

204

100

20

102

204

2.6

1.3

160

75

106

110

50

221

113

50

110

221

4.8

2.41

255

135

mV

Bits

µV/LSB

dB

bits

mV/LSB

dB

V

LIM

Active Current Limit in High Power Mode

212

106

V

LIM

V

MIN

V

SC

Active Current Limit in AUTO Pin Mode

106

212

3.8

1.9

200

100

14

30.5

30

14

5.835

30

DC Disconnect Sense Voltage

Short-Circuit Sense

Port Current ReadBack

Resolution

LSB Weight

50Hz to 60Hz Noise Rejection

Port Voltage ReadBack

Resolution

LSB Weight

50Hz to 60Hz Noise Rejection

Digital Interface

V

ILD

Digital Input Low Voltage

I

2

C Input Low Voltage

V

IHD

Digital Input High Voltage

Digital Output Low Voltage

Internal Pull-Up to V

DD

Internal Pull-Down to DGND

0.8

2.2

0.4

0.7

50

V

kΩ

4

4266acfe

For more information

www.linear.com/LTC4266A

LTC4266A/LTC4266C

electricAl chArActeristics

SYMBOL

t

DET

t

DETDLY

t

CLE

t

CLEON

t

ME

t

MEL

t

PON

PARAMETER

Detection Time

Detection Delay

Class Event Duration

Class Event Turn-On Duration

Mark Event Duration

Last Mark Event Duration

Power On Delay in AUTO Pin Mode

Turn On Rise Time

Turn On Ramp Rate

Fault Delay

Midspan Mode Detection Backoff

Power Removal Detection Delay

t

START

t

LIM

t

CUT

Maximum Current Limit Duration During Port

Start-Up

Maximum Current Limit Duration After Port

Start-Up

Maximum Overcurrent Duration After Port

Start-Up

Maximum Overcurrent Duty Cycle

t

MPS

t

DIS

t

MSD

t

SHDN

Maintain Power Signature (MPS) Pulse Width

Sensitivity

Masked Shut Down Delay

Port Shut Down Delay

I

2

C Watchdog Timer Duration

Minimum Pulse Width for Masked Shut Down

Minimum Pulse Width for

SHDN

Minimum Pulse Width for

RESET

(Note 7)

Timing Characteristics

Beginning to End of Detection (Note 7)

From PD Connected to Port to Detection

Complete (Note 7)

(Note 7)

C

PORT

= 0.6µF (Note 7)

(Notes 7, 11)

From End of Valid Detect to Application of

Power to Port (Note 7)

l

The

l

denotes the specifications which apply over the full operating

temperature range, otherwise specifications are at T

A

= 25°C. AGND – V

EE

= 54V, AGND = DGND, and V

DD

– DGND = 3.3V

unless otherwise noted. (Notes 3, 4)

CONDITIONS

MIN

270

300

12

0.1

8.6

16

22

60

15

24

10

1.0

2.3

1.0

52

1.1

2.5

1.3

62.5

11.9

52

5.8

1.6

320

350

62.5

6.3

66

6.7

3.6

380

6.5

1.5

3

4.5

2

3

2.7

2.5

66

TYP

290

MAX

310

470

UNITS

ms

µs

V/µs

s

ms

%

ms

µs

s

µs

(AGND – V

OUT

): 10% to 90% of (AGND – V

EE

),

l

C

PORT

= 0.15µF (Note 7)

C

PORT

= 0.15µF (Note 7)

From I

CUT

Fault to Next Detect

Rport = 15.5kΩ (Note 7)

From Power Removal After t

DIS

to Next

Detect (Note 7)

(Note 7)

t

LIM

Enable = 1 (Notes 7, 12)

(Note 7)

Current Pulse Width to Reset Disconnect

Timer (Notes 7, 8)

(Note 7)

l

Maintain Power Signature (MPS) Dropout Time (Note 7)

4266acfe

For more information

www.linear.com/LTC4266A

5

参数名称	属性值
Brand Name	Linear Technology
是否Rohs认证	符合
厂商名称	Linear ( ADI )
零件包装代码	QFN
包装说明	QCCN, LCC38,.2X.28,20
针数	38
制造商包装代码	UHF
Reach Compliance Code	compliant
ECCN代码	EAR99
Is Samacsys	N
模拟集成电路 - 其他类型	POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 代码	R-PQCC-N38
JESD-609代码	e3
湿度敏感等级	1
端子数量	38
最高工作温度	85 °C
最低工作温度	-40 °C
封装主体材料	PLASTIC/EPOXY
封装代码	QCCN
封装等效代码	LCC38,.2X.28,20
封装形状	RECTANGULAR
封装形式	CHIP CARRIER
峰值回流温度（摄氏度）	NOT SPECIFIED
电源	3.3,54 V
认证状态	Not Qualified
最大供电电流 (Isup)	5 mA
表面贴装	YES
技术	CMOS
温度等级	INDUSTRIAL
端子面层	Matte Tin (Sn)
端子形式	NO LEAD
端子节距	0.5 mm
端子位置	QUAD
处于峰值回流温度下的最长时间	NOT SPECIFIED
Base Number Matches	1

	LTC4266AIUHF-1#TRPBF	LTC4266AIUHF-3#PBF	LTC4266AIUHF-1#PBF	LTC4266CIUHF#TRPBF	LTC4266AIUHF-2#TRPBF	LTC4266AIUHF-3#TRPBF	LTC4266AIUHF-4#TRPBF	LTC4266CIUHF#PBF	LTC4266AIUHF-2#PBF
描述	IC POE LTPOE++ QUAD PSE 38-QFN	IC POE LTPOE++ QUAD PSE 38-QFN	IC POE LTPOE++ QUAD PSE 38-QFN	IC POE 802.3AF QUAD PSE 38-QFN	IC POE LTPOE++ QUAD PSE 38-QFN	IC POE LTPOE++ QUAD PSE 38-QFN	IC POE LTPOE++ QUAD PSE 38-QFN	IC POE 802.3AF QUAD PSE 38-QFN	IC POE LTPOE++ QUAD PSE 38-QFN
Brand Name	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology	Linear Technology
是否Rohs认证	符合	符合	符合	符合	符合	符合	符合	符合	符合
零件包装代码	QFN	QFN	QFN	QFN	QFN	QFN	QFN	QFN	QFN
包装说明	QCCN, LCC38,.2X.28,20	QCCN, LCC38,.2X.28,20	QCCN, LCC38,.2X.28,20	QCCN, LCC38,.2X.28,20	QCCN, LCC38,.2X.28,20	QCCN, LCC38,.2X.28,20	QCCN, LCC38,.2X.28,20	QCCN, LCC38,.2X.28,20	QCCN, LCC38,.2X.28,20
针数	38	38	38	38	38	38	38	38	38
制造商包装代码	UHF	UHF	UHF	UHF	UHF	UHF	UHF	UHF	UHF
Reach Compliance Code	compliant	compliant	compliant	compliant	compliant	compliant	compliant	compliant	compliant
ECCN代码	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99	EAR99
模拟集成电路 - 其他类型	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT	POWER SUPPLY MANAGEMENT CIRCUIT
JESD-30 代码	R-PQCC-N38	R-PQCC-N38	R-PQCC-N38	R-PQCC-N38	R-PQCC-N38	R-PQCC-N38	R-PQCC-N38	R-PQCC-N38	R-PQCC-N38
JESD-609代码	e3	e3	e3	e3	e3	e3	e3	e3	e3
湿度敏感等级	1	1	1	1	1	1	1	1	1
端子数量	38	38	38	38	38	38	38	38	38
最高工作温度	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C	85 °C
最低工作温度	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C	-40 °C
封装主体材料	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY	PLASTIC/EPOXY
封装代码	QCCN	QCCN	QCCN	QCCN	QCCN	QCCN	QCCN	QCCN	QCCN
封装等效代码	LCC38,.2X.28,20	LCC38,.2X.28,20	LCC38,.2X.28,20	LCC38,.2X.28,20	LCC38,.2X.28,20	LCC38,.2X.28,20	LCC38,.2X.28,20	LCC38,.2X.28,20	LCC38,.2X.28,20
封装形状	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR	RECTANGULAR
封装形式	CHIP CARRIER	CHIP CARRIER	CHIP CARRIER	CHIP CARRIER	CHIP CARRIER	CHIP CARRIER	CHIP CARRIER	CHIP CARRIER	CHIP CARRIER
峰值回流温度（摄氏度）	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
电源	3.3,54 V	3.3,54 V	3.3,54 V	3.3,54 V	3.3,54 V	3.3,54 V	3.3,54 V	3.3,54 V	3.3,54 V
认证状态	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified	Not Qualified
最大供电电流 (Isup)	5 mA	5 mA	5 mA	5 mA	5 mA	5 mA	5 mA	5 mA	5 mA
表面贴装	YES	YES	YES	YES	YES	YES	YES	YES	YES
技术	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS	CMOS
温度等级	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL	INDUSTRIAL
端子面层	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)	Matte Tin (Sn)
端子形式	NO LEAD	NO LEAD	NO LEAD	NO LEAD	NO LEAD	NO LEAD	NO LEAD	NO LEAD	NO LEAD
端子节距	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm	0.5 mm
端子位置	QUAD	QUAD	QUAD	QUAD	QUAD	QUAD	QUAD	QUAD	QUAD
处于峰值回流温度下的最长时间	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED	NOT SPECIFIED
厂商名称	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	-	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )	Linear ( ADI )

LTC4266AIUHF-1#TRPBF

LTC4266AIUHF-1#TRPBF概述

LTC4266AIUHF-1#TRPBF规格参数

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