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LTC4266C Datasheet(PDF) 6 Page - Linear Technology

Part # LTC4266C
Description  12-Port PoE/PoE/LTPoE PSE Controller
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4266C Datasheet(HTML) 6 Page - Linear Technology

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LTC4270/LTC4271
6
42701fb
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
XIO
VOLX
XIO Digital Output Low
VXIOn – VEE, IXIOn = 5mA
l
0.7
V
VOHX
XIO Digital Output High
VXIOn – VEE, IXIOn = 100µA
l
3.5
V
XIO Digital Input Low Voltage
VXIOn – VEE
l
0.8
V
XIO Digital Input High Voltage
VXIOn – VEE
l
3.4
V
Internal Pull Up to CAP2
XIO0, XIO1
50
PSE Timing Characteristics
tDET
Detection Time
Beginning To End of Detection (Note 7)
220
ms
tCLE
Class Event Duration
(Note 7)
12
ms
tCLEON
Class Event Turn On Duration
CPORT = 0.6µF (Note 7)
l
0.1
ms
tME
Mark Event Duration
(Note 7, Note 11)
8.6
ms
tMEL
Last Mark Event Duration
(Note 7, Note 11)
l
16
22
ms
tPON
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 – VOUT): 10% to 90% of (AGND - VEE) CPORT =
0.15µF (Note 7)
l
15
24
µs
Turn-On Ramp Rate
CPORT = 0.15µF (Note 7)
l
10
V/µs
tTOCL
Turn-On Class Transition
CPORT = 0.15µF (Note 7)
l
0.1
ms
tED
Fault Delay
From ICUT or ILIM Fault to Next Detect
(Note 7)
l
1.0
1.1
s
Midspan Mode Detection Backoff
RPORT = 15.5kΩ (Note 7)
l
2.3
2.5
2.7
s
Power Removal Detection Delay
From Power Removal After tDIS to Next Detect (Note 7)
l
1.0
1.3
2.5
s
tSTART
Maximum Current Limit Duration
During Port Start-Up
(Note 7)
l
52
59
66
ms
tCUT
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
%
tLIM
Maximum Current Limit Duration
After Port Start-Up – tLIM Enabled
tLIM = 1 (Note 7, Note 12)
l
10
12
14
ms
Maximum Current Limit Duration
After Port Start-Up – tLIM as tCUT
tLIM = 0 (Note 7, Note 12)
l
52
59
66
ms
tMPS
Maintain Power Signature (MPS)
Pulse Width Sensitivity
Current Pulse Width to Reset Disconnect Timer (Note 7,
Note 8)
l
1.6
3.6
ms
tDIS
Maintain Power Signature (MPS)
Dropout Time
(Note 7, Note 5)
l
320
350
380
ms
tMSD
Masked Shut Down Delay
(Note 7)
6.5
µs
I2C 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 TA = 25°C. AGND – VEE = 54V and VDD – DGND = 3.3V unless otherwise noted.
(Notes 3 & 4)


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