........................................... –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
LTC4266C ................................................ 0°C to 70°C
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
MID
INT
SCL
SDAOUT
SDAIN
AD3
AD2
AD1
1
2
3
4
5
6
7
8
9
36
MSD
34 OUT1
33 GATE1
32 SENSE1
31 OUT2
30 GATE2
29 SENSE2
28 V
EE
27 OUT3
26 GATE3
25 SENSE3
24 OUT4
23 GATE4
22 SENSE4
21 AGND
20
SHDN4
19
SHDN3
SDAOUT 1
NC 2
SDAIN 3
AD3 4
AD2 5
AD1 6
AD0 7
DNC 8
NC 9
DGND 10
NC 11
NC 12
13 14 15 16 17 18 19
SHDN1
SHDN2
SHDN3
SHDN4
AGND
SENSE4
V
DD
39
MID
SCL
INT
35 AUTO
TOP VIEW
RESET
AUTO
OUT1
31 GATE1
30 SENSE1
29 OUT2
28 GATE2
27 SENSE2
26 V
EE
25 V
EE
24 OUT3
23 GATE3
22 SENSE3
21 OUT4
20 GATE4
MSD
38 37 36 35 34 33 32
AD0 10
NC 11
NC 12
NC 13
NC 14
DGND 15
V
DD
16
SHDN1
17
SHDN2
18
GW36 PACKAGE
36-LEAD PLASTIC WIDE SSOP
T
JMAX
= 125°C,
θ
JA
= 80°C/W
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
LTC4266CGW#PBF
LTC4266IGW#PBF
LTC4266CUHF#PBF
LTC4266IUHF#PBF
TAPE AND REEL
LTC4266CGW#TRPBF
LTC4266IGW#TRPBF
LTC4266CUHF#TRPBF
LTC4266IUHF#TRPBF
http://www.linear.com/product/LTC4266#orderinfo
PART MARKING*
LTC4266CGW
LTC4266IGW
4266
4266
PACKAGE DESCRIPTION
36-Lead Plastic Wide SSOP
36-Lead Plastic Wide SSOP
38-Lead (5mm
×
7mm) Plastic QFN
38-Lead (5mm
×
7mm) Plastic QFN
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
0°C to 70°C
–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
4266fg
For more information
www.linear.com/LTC4266
LTC4266
electricAl chArActeristics
SYMBOL
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 Complaint Output
For IEEE Type 2 Complaint Output
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
l
l
l
l
l
l
l
MIN
45
51
20
3.0
25
TYP
MAX
57
57
UNITS
V
V
V
V
V
V
mA
mA
µA
µA
V
V
mA
V
V/µs
kΩ
kΩ
V
mA
mA
mA
mA
mA
mA
V
mA
mA
mA
mA
Undervoltage Lock-out Level
V
DD
V
DD
Supply Voltage
Undervoltage Lock-out
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
l
l
l
l
l
l
l
l
Detection Current Compliance
V
OC
Detection Voltage Compliance
Detection Voltage Slew Rate
Min. Valid Signature Resistance
Max. 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
l
l
l
l
l
l
l
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
l
0.12
30
12
2.4
500
14
2.8
700
l
V
V
kΩ
Output Voltage Sense
V
PG
Power Good Threshold Voltage
OUT Pin Pull-Up Resistance to AGND
l
l
4266fg
For more information
www.linear.com/LTC4266
3
LTC4266
electricAl chArActeristics
SYMBOL
Current Sense
V
CUT
Overcurrent Sense Voltage
V
SENSEn
– V
EE
, icut12 = icut34 = hpen = 00h
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
, dblpwr = hpen = 00h
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,
SHDNn, RESET, MSD,
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
l
l
l
l
l
l
l
l
l
l
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)
PARAMETER
CONDITIONS
MIN
180
9
4.5
90
26
49
152
TYP
188
9.38
4.69
94
28
52
159
MAX
196
9.75
4.88
98
30
55
166
UNITS
mV
mV/LSB
mV/LSB
mV
mV
mV
mV
Overcurrent Sense in AUTO pin mode
V
LIM
Active Current Limit in 802.3af Compliant
Mode
l
l
l
l
l
l
l
l
l
l
l
204
40
204
100
20
102
204
2.6
1.3
160
75
212
220
100
221
113
50
110
221
4.8
2.41
255
135
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
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
50-60Hz Noise Rejection
Port Voltage ReadBack
Resolution
LSB Weight
50-60Hz 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
0.8
2.2
0.4
0.7
50
50
V
V
V
V
V
kΩ
kΩ
4
4266fg
For more information
www.linear.com/LTC4266
LTC4266
electricAl chArActeristics
SYMBOL
t
DET
t
DETDLY
t
CLE1
t
ME1
t
CLE2
t
ME2
t
CLE3
t
PON
PARAMETER
Detection Time
Detection Delay
First Class Event Duration
First Mark Event Duration
Second Class Event Duration
Second Mark Event Duration
Third Class 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
Timing Characteristics
Beginning to End of Detection (Note 7)
From PD Connected to Port to Detection
Complete (Note 7)
(Note 7)
(Notes 7, 11)
(Note 7)
(Note 7)
C
PORT
= 0.6µF (Note 7)
From End of Valid Detect to Application of
Power to Port (Note 7)
(AGND – V
OUT
): 10% to 90% of
(AGND – V
EE
), 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)
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
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
11
6.8
11
19
12
8.6
12
22
0.1
60
15
24
10
1.0
2.3
1.0
52
52
52
5.8
1.6
320
350
1.1
2.5
1.3
62.5
62.5
62.5
6.3
2.7
2.5
66
66
66
6.7
3.6
380
6.5
6.5
1.5
3
3
4.5
2
3
TYP
290
MAX
310
470
13
10.3
13
UNITS
ms
ms
ms
ms
ms
ms
ms
ms
µs
V/µs
s
s
s
ms
ms
ms
%
ms
ms
µs
µs
s
µs
µs
µs
Maximum Current Limit Duration During Port t
START1
= 0, t
START0
= 0 (Notes 7, 12)
Start-Up
Maximum Current Limit Duration After Port
Start-Up
Maximum Overcurrent Duration After Port
Start-Up
Maximum Overcurrent Duty Cycle
t
CUT1
= 0, t
CUT0
= 0, t
LIM
= 0h (Notes 7, 12)
t
CUT1
= 0, t
CUT0
= 0 (Notes 7, 12)
(Note 7)
t
MPS
t
DIS
t
MSD
t
SHDN
Maintain Power Signature (MPS) Pulse Width Current Pulse Width to Reset Disconnect
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
