參數(shù)資料
型號： LTC4274CUHF#PBF
廠商： Linear Technology
文件頁數(shù)： 5/28頁
文件大?。?/td> 702K
描述： IC CONTROLLER POE 38-QFN
標(biāo)準(zhǔn)包裝： 52
類型： 以太網(wǎng)供電 PSE 控制器（PoE）
應(yīng)用： 供電設(shè)備（PSE）
內(nèi)部開關(guān)： 無
電流限制： 可調(diào)
電源電壓： 3 V ~ 4.3 V
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 38-QFN
供應(yīng)商設(shè)備封裝： 38-QFN（5x7）裸露焊盤
包裝： 管件
LTC4274
5
4274fd
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Timing Characteristics
t
DET
Detection Time
Beginning to End of Detection (Note 7)
l
270
290
310
ms
t
DETDLY
Detection Delay
From PD Connected to Port to Detection
Complete (Note 7)
l
300
470
ms
t
CLE1
First Class Event Duration
(Note 7)
l
11
12
13
ms
t
ME1
First Mark Event Duration
(Notes 7, 11)
l
6.8
8.6
10.3
ms
t
CLE2
Second Class Event Duration
(Note 7)
l
11
12
13
ms
t
ME2
Second Mark Event Duration
(Note 7)
l
19
22
ms
t
CLE3
Third Class Event Duration
C
PORT
 = 0.6糉 (Note 7)
l
0.1
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
 = 0.15糉 (Note 7)
l
15
24
約
Turn On Ramp Rate
C
PORT
 = 0.15糉 (Note 7)
l
10
V/約
Fault Delay
From I
CUT
 Fault to Next Detect
l
1.0
1.1
s
Midspan Mode Detection Backoff
Rport = 15.5k?(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
Startup
t
START1
 = 0, t
START0
 = 0 (Notes 7, 12)
l
52
62.5
66
ms
t
LIM
Maximum Current Limit Duration After Port
Startup
t
CUT1
 = 0, t
CUT0
 = 0, t
LIM
 = 0h (Notes 7, 12)
l
52
62.5
66
ms
t
CUT
Maximum Overcurrent Duration After Port
Startup
t
CUT1
 = 0, t
CUT0
 = 0 (Notes 7, 12)
l
52
62.5
66
ms
Maximum Overcurrent Duty Cycle
(Note 7)
l
5.8
6.3
6.7
%
t
MPS
Maintain Power Signature (MPS) Pulse Width
Sensitivity
Current Pulse Width to Reset Disconnect
Timer (Notes 7, 8)
l
1.6
3.6
ms
t
DIS
Maintain Power Signature (MPS) Dropout
Time
t
conf
 [1:0] = 00b (Notes 5, 7, 12)
l
320
350
380
ms
t
MSD
Masked Shut Down Delay
(Note 7)
l
6.5
約
t
SHDN
Port Shut Down Delay
(Note 7)
l
6.5
約
I
2
C Watchdog Timer Duration
l
1.5
2
3
s
Minimum Pulse Width for Masked Shut
Down
(Note 7)
l
3
約
Minimum Pulse Width for SHDN
(Note 7)
l
3
約
Minimum Pulse Width for RESET
(Note 7)
l
4.5
約
ELECTRICAL CHARACTERISTICS
 
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
 = 25癈. AGND  V
EE
 = 54V, AGND = DGND, and V
DD
  DGND = 3.3V unless
otherwise noted. (Notes 3, 4)
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