ltc4266a Linear Technology Corporation, ltc4266a Datasheet - Page 5

• Manufacturer Part Number: ltc4266a
• Description: Quad Poe/poe+/ltpoe++ Pse Controller
• Manufacturer: Linear Technology Corporation

SYMBOL
Timing Characteristics
t
t
t
t
t
t
t
t
t
t
t
t
t
t
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
unless otherwise noted. (Notes 3, 4)
DET
DETDLY
CLE
CLEON
ME
MEL
PON
START
LIM
CUT
MPS
DIS
MSD
SHDN
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
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
Maintain Power Signature (MPS) Pulse Width
Sensitivity
Maintain Power Signature (MPS) Dropout Time (Note 7)
Masked Shut Down Delay
Port Shut Down Delay
I
Minimum Pulse Width for Masked Shut Down
Minimum Pulse Width for SHDN
Minimum Pulse Width for RESET
2
C Watchdog Timer Duration
A
CONDITIONS
Beginning to End of Detection (Note 7)
From PD Connected to Port to Detection
Complete (Note 7)
(Note 7)
C
(Notes 7, 11)
(Notes 7, 11)
From End of Valid Detect to Application of
Power to Port (Note 7)
(AGND – V
C
C
From I
Rport = 15.5kΩ (Note 7)
From Power Removal After t
Detect (Note 7)
(Note 7)
t
(Note 7)
(Note 7)
Current Pulse Width to Reset Disconnect
Timer (Notes 7, 8)
(Note 7)
(Note 7)
(Note 7)
(Note 7)
(Note 7)
= 25°C. AGND – V
LIM
PORT
PORT
PORT
Enable = 1 (Notes 7, 12)
= 0.6μF (Note 7)
= 0.15μF (Note 7)
= 0.15μF (Note 7)
CUT
The
OUT
Fault to Next Detect
l
): 10% to 90% of (AGND – V
denotes the specifications which apply over the full operating
EE
= 54V, AGND = DGND, and V
DIS
to Next
LTC4266A/LTC4266C
EE
),
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
270
300
320
1.0
2.3
1.0
5.8
1.6
1.5
4.5
16
15
52
52
3
3
DD
– DGND = 3.3V
62.5
11.9
62.5
TYP
290
350
8.6
1.1
2.5
1.3
6.3
12
22
24
2
MAX
310
470
380
0.1
2.7
2.5
6.7
3.6
6.5
6.5
60
10
66
66
3
4266acfa
UNITS
5
V/μs
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
ms
μs
μs
μs
μs
μs
μs
%
s
s
s
s