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LTC4290AIUJ#PBF

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32
LTC4290/LTC4271
4
429071fb
For more information www.linear.com/LTC4290
ELECTRICAL CHARACTERISTICS
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
EE
Main PoE Supply Voltage AGND – V
EE
For IEEE Type 1 Compliant Output
For IEEE Type 2 Compliant Output
For LTPoE
++
Compliant Output
l
l
l
45
51
54.75
57
57
57
V
V
V
Undervoltage Lock-Out AGND – V
EE
l
20 25 30 V
V
DD
V
DD
Supply Voltage V
DD
– DGND
l
3.0 3.3 3.6 V
Undervoltage Lock-Out V
DD
– DGND
2.7 V
V
CAP1
Internal Regulator Supply Voltage V
CAP1
– DGND 1.84 V
V
CAP2
Internal Regulator Supply Voltage V
CAP2
– V
EE
4.3 V
I
EE
V
EE
Supply Current (AGND – V
EE
) = 55V
l
9 15 mA
R
EE
V
EE
Supply Resistance V
EE
< 15V
l
12 kΩ
I
DD
V
DD
Supply Current (V
DD
– DGND) = 3.3V
l
10 15 mA
Detection
Detection Current – Forced Current First Point, AGND – V
OUTn
= 9V
Second Point, AGND – V
OUTn
= 3.5V
l
l
220
143
240
160
260
180
µA
µA
Detection Voltage – Forced Voltage AGND – V
OUTn
, 5µA ≤ I
OUTn
≤ 500µA
First Point
Second Point
l
l
7
3
8
4
9
5
V
V
Detection Current Compliance AGND – V
OUTn
= 0V
l
0.8 0.9 mA
V
OC
Detection Voltage Compliance AGND – V
OUTn
, Open Port
l
10.4 12 V
Detection Voltage Slew Rate AGND – V
OUTn
, C
PORT
= 0.15µF
l
0.01 V/µs
Min. Valid Signature Resistance
l
15.5 17 18.5 kΩ
Max. Valid Signature Resistance
l
27.5 29.7 32 kΩ
Classification
V
CLASS
Classification Voltage AGND – V
OUTn
, 0mA ≤ I
OUTn
≤ 50mA
l
16.0 20.5 V
Classification Current Compliance V
OUTn
= AGND
l
53 61 67 mA
Classification Threshold Current Class 0-1
Class 1-2
Class 2-3
Class 3-4
Class 4-Overcurrent
l
l
l
l
l
5.5
13.5
21.5
31.5
45.2
6.5
14.5
23
33
48
7.5
15.5
24.5
34.9
50.8
mA
mA
mA
mA
mA
V
MARK
Classification Mark State Voltage AGND – V
OUTn
, 0.1mA ≤ I
CLASS
≤ 5mA
l
7.5 9 10 V
Mark State Current Compliance V
OUTn
= AGND
l
53 61 67 mA
Gate Driver
GATE Pin Pull-Down Current Port Off, V
GATEn
= V
EE
+ 5V
Port Off, V
GATEn
= V
EE
+ 1V
l
l
0.4
0.08
0.12
mA
mA
GATE Pin Fast Pull-Down Current V
GATEn
= V
EE
+ 5V 30 mA
GATE Pin On Voltage V
GATEn
– V
EE
, I
GATEn
= 1µA
l
8 12 14 V
Output Voltage Sense
V
PG
Power Good Threshold Voltage V
OUTn
– V
EE
l
2 2.4 2.8 V
OUT Pin Pull-Up Resistance to AGND 0V ≤ (AGND – V
OUT
) ≤ 5V
l
300 500 700 kΩ
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 and V
DD
– DGND = 3.3V unless otherwise noted.
(Notes 3 & 4)
LTC4290/LTC4271
5
429071fb
For more information www.linear.com/LTC4290
ELECTRICAL CHARACTERISTICS
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 and V
DD
– DGND = 3.3V unless otherwise noted.
(Notes 3 & 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CUT
Overcurrent Sense Voltage V
SENSEn
– V
EE
,
hpen = 0Fh, cutn = D4h
hpen = 0Fh, cutn = E2h (Note 12)
l
l
89
152
94
159
99
168
mV
mV
Overcurrent Sense in AUTO Pin Mode Class 0, Class 3
Class 1
Class 2
Class 4
l
l
l
l
89
26
49
152
94
28
52
159
99
30
55
168
mV
mV
mV
mV
V
LIM
Active Current Limit in 802.3af Compliant Mode V
SENSEn
– V
EE
, hpen = 0Fh, limn = 80h,
(AGND – V
EE
) = 55V
V
EE
< V
OUT
< AGND – 29V
AGND – V
OUT
= 0V (Note 12)
l
l
102
25
106
112
50
mV
mV
Active Current Limit in High Power Mode hpen = 0Fh, limn = C0h,
(AGND – V
EE
) = 55V
V
OUT
– V
EE
= 0 – 10V
V
EE
+ 23V < V
OUT
< AGND – 29V
AGND – V
OUT
= 0V (Note 12)
l
l
l
204
102
25
212
106
225
115
50
mV
mV
mV
Active Current Limit in AUTO Pin Mode V
EE
< V
OUT
< AGND – 10V,
(AGND – V
EE
) = 55V
Class 0 to Class 3
Class 4
l
l
102
204
106
212
112
225
mV
mV
V
MIN
DC Disconnect Sense Voltage V
SENSE
– V
EE
, rdis Bit = 0
V
SENSE
– V
EE
, rdis Bit = 1 (Note 12)
l
l
2.6
1.3
3.8
1.9
4.9
2.45
mV
mV
V
SC
Short-Circuit Sense V
SENSEn
– V
EE
– V
LIM
(Note 12)
rdis Bit = 0
rdis Bit = 1
l
l
125
70
200
100
255
125
mV
mV
Port Current Readback
Resolution No Missing Codes, Reported as 14 Bits 12 Bits
LSB Weight V
SENSEn
– V
EE
30.518 µV/LSB
Conversion Period 25.1 ms/
Convert
Port Voltage Readback
Resolution No Missing Codes, Reported as 14 Bits 12 Bits
LSB Weight AGND – V
OUTn
5.8350 mV/LSB
Digital Interface
V
ILD
Digital Input Low Voltage ADn, RESET, MSD, GPn, AUTO, MID
(Note 6)
l
0.8 V
I
2
C Input Low Voltage SCL, SDAIN (Note 6)
l
1.0 V
V
IHD
Digital Input High Voltage (Note 6)
l
2.2 V
Digital Output Voltage Low I
SDAOUT
= 3mA, I
INT
= 3mA
I
SDAOUT
= 5mA, I
INT
= 5mA
l
l
0.4
0.7
V
V
Internal Pull Up to V
DD
ADn, RESET, MSD, GPn 50 kΩ
Internal Pull Down To DGND AUTO, MID 50 kΩ
LTC4290/LTC4271
6
429071fb
For more information www.linear.com/LTC4290
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
XIO
V
OLX
XIO Digital Output Low V
XIOn
– V
EE
, I
XIOn
= 5mA
l
0.7 V
V
OHX
XIO Digital Output High V
XIOn
– V
EE
, I
XIOn
= 100µA
l
3.5 V
XIO Digital Input Low Voltage V
XIOn
– V
EE
l
0.8 V
XIO Digital Input High Voltage V
XIOn
– V
EE
l
3.4 V
Internal Pull Up to CAP2 XIO0, XIO1 50 kΩ
PSE Timing Characteristics
t
DET
Detection Time Beginning To End of Detection (Note 7) 220 ms
t
CLE
Class Event Duration (Note 7) 12 ms
t
CLEON
Class Event Turn On Duration C
PORT
= 0.6µF (Note 7)
l
0.1 ms
t
ME
Mark Event Duration (Note 7, Note 11) 8.6 ms
t
MEL
Last Mark Event Duration (Note 7, Note 11)
l
16 22 ms
t
PON
Power On Delay in AUTO Pin Mode From End of Valid Detect to Application of
Power to Port (Note 7)
l
60 ms
Turn-On Rise Time (AGND – V
OUT
): 10% to 90% of (AGND -
V
EE
) C
PORT
= 0.15µF (Note 7)
l
15 24 µs
Turn-On Ramp Rate C
PORT
= 0.15µF (Note 7)
l
10 V/µs
t
TOCL
Turn-On Class Transition C
PORT
= 0.15µF (Note 7)
l
0.1 ms
t
ED
Fault Delay From I
CUT
or I
LIM
Fault to Next Detect
(Note 7)
l
1.0 1.1 s
Midspan Mode Detection Backoff R
PORT
= 15.5kΩ (Note 7)
l
2.3 2.5 2.7 s
Power Removal Detection Delay From Power Removal After t
DIS
to Next
Detect (Note 7)
l
1.0 1.3 2.5 s
t
START
Maximum Current Limit Duration During Port
Start-Up
(Note 7)
l
52 59 66 ms
t
CUT
Maximum Overcurrent Duration After Port Start-
Up
(Note 7)
l
52 59 66 ms
Maximum Overcurrent Duty Cycle (Note 7)
l
5.8 6.3 6.7 %
t
LIM
Maximum Current Limit Duration After Port Start-
Up – t
LIM
Enabled
t
LIM
= 1 (Note 7, Note 12)
l
10 12 14 ms
Maximum Current Limit Duration After Port Start-
Up – t
LIM
as t
CUT
t
LIM
= 0 (Note 7, Note 12)
l
52 59 66 ms
t
MPS
Maintain Power Signature (MPS) Pulse Width
Sensitivity
Current Pulse Width to Reset Disconnect
Timer (Note 7, Note 8)
l
1.6 3.6 ms
t
DIS
Maintain Power Signature (MPS) Dropout Time (Note 7, Note 5)
l
320 350 380 ms
t
MSD
Masked Shut Down Delay (Note 7) 6.5 µs
I
2
C Watchdog Timer Duration (Note 7)
l
1.5 2 3 s
Minimum Pulse Width for Masked Shut Down (Note 7)
l
3 µs
Minimum Pulse Width for
RESET (Note 7)
l
4.5 µs
ELECTRICAL CHARACTERISTICS
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 and V
DD
– DGND = 3.3V unless otherwise noted.
(Notes 3 & 4)
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30P31-P32

LTC4290AIUJ#PBF

Mfr. #:
Buy LTC4290AIUJ#PBF
Manufacturer:
Analog Devices Inc.
Description:
Power Switch ICs - POE / LAN LTPoE++ 90W 8-Port PSE Controller (Ethernet interface)
Lifecycle:
New from this manufacturer.
Delivery:
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