參數(shù)資料
型號: LTC4274CUHF#PBF
廠商: Linear Technology
文件頁數(shù): 7/28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):
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
7
4274fd
 TYPICAL PERFORMANCE CHARACTERISTICS
Power On Sequence in AUTO Pin
Mode
Powering Up into a 180糉 Load
802.3af Classification in
AUTO Pin Mode
2-Event Classification in
AUTO Pin Mode
Classification Transient Response
to 40mA Load Step
Classification Current Compliance
V
DD
 Supply Current vs Voltage
V
EE
 Supply Current vs Voltage
802.3at I
LIM
 Threshold vs
Temperature
100ms/DIV
70
60
10
0
10
20
30
40
50
4274 G01
PORT 1
V
DD
 = 3.3V
V
EE
 = 54V
FORCED CURRENT DETECTION
FORCED VOLTAGE
DETECTION
802.3af
CLASSIFICATION
POWER ON
GND
V
EE
5ms/DIV
GND
0mA
4274 G02
V
EE
V
EE
GATE
VOLTAGE
10V/DIV
PORT
CURRENT
200 mA/DIV
PORT
VOLTAGE
20V/DIV
FOLDBACK
FET ON
425mA
CURRENT LIMIT
LOAD
FULLY
CHARGED
V
DD
 = 3.3V
V
EE
 = 54V
5ms/DIV
V
EE
18.4
PORT
VOLTAGE
10V/DIV
GND
4274 G03
V
DD
 = 3.3V
V
EE
 = 55V
PD IS CLASS 1
10ms/DIV
V
EE
17.6
PORT
VOLTAGE
10V/DIV
GND
4274 G04
V
DD
 = 3.3V
V
EE
 = 55V
PD IS CLASS 4
1ST CLASS EVENT
2ND CLASS EVENT
50約/DIV
40mA
0mA
4274 G05
20V
PORT
VOLTAGE
1V/DIV
PORT
CURRENT
20mA/DIV
V
DD
 = 3.3V
V
EE
 = 54V
CLASSIFICATION CURRENT (mA)
20
18
16
14
12
10
8
6
4
2
0
0
10    20    30
4274 G06
40    50    60    70
V
DD
 = 3.3V
V
EE
 = 54V
T
A
 = 25癈
V
DD
 SUPPLY VOLTAGE (V)
2.7
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
2.9  3.1   3.3   3.5
4274 G07
3.7  3.9   4.1   4.3
40癈
25癈
85癈
V
EE
 SUPPLY VOLTAGE (V)
60
2.0
2.1
2.2
2.3
2.4
55  50  45  40
4274 G08
35  30  25  20
40癈
25癈
85癈
TEMPERATURE (癈)
40
210
211
213
212
214
215
840
844
852
848
856
860
0
40
4274 G09
80
120
V
DD
 = 3.3V
V
EE
 = 54V
R
SENSE
 = 0.25?/DIV>
REG 48h = C0h
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