參數(shù)資料
型號(hào): LTC4274CUHF#PBF
廠商: Linear Technology
文件頁(yè)數(shù): 8/28頁(yè)
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(wú)
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
8
4274fd
TYPICAL PERFORMANCE CHARACTERISTICS
802.3af I
LIM
 Threshold
vs Temperature
DC Disconnect Threshold
vs Temperature
Current Limit Foldback
ADC Noise Histogram
Current Readback in Fast Mode
ADC Integral Nonlinearity
Current Readback in Fast Mode
802.3at I
CUT
 Threshold
vs Temperature
802.3af I
CUT
 Threshold
vs Temperature
TEMPERATURE (癈)
40
105.00
106.50
105.75
107.25
108.00
420
423
426
429
432
0
40
4274 G10
80
120
V
DD
 = 3.3V
V
EE
 = 54V
R
SENSE
 = 0.25?/DIV>
REG 48h = 80h
TEMPERATURE (癈)
40
158
161
160
159
162
163
630
636
640
648
644
652
0
40
4274 G11
80
120
V
DD
 = 3.3V
V
EE
 = 54V
R
SENSE
 = 0.25?/DIV>
REG 47h = E2h
TEMPERATURE (癈)
40
93.00
94.50
93.75
95.25
96.00
372
375
378
381
384
0
40
4274 G12
80
120
V
DD
 = 3.3V
V
EE
 = 54V
R
SENSE
 = 0.25?/DIV>
REG 47h = D4h
ADC OUTPUT
191
0
400
350
300
250
200
150
100
50
193
192
194
4274 G15
195    196
V
SENSE
  V
EE
 = 110.4mV
CURRENT SENSE RESISTOR INPUT VOLTAGE (mV)
0
0
0.5
400
4274 G16
0.5
1.0
100
200 250
500
1.0
300
50
150
450
350
V
OUTn
 (V)
54
0
900
800
700
600
500
400
300
200
100
0
225
200
175
150
125
100
75
50
25
36
45
27
4274 G14
18    9
0
V
DD
 = 3.3V
V
EE
 = 54V
R
SENSE
 = 0.25?/DIV>
REG 48h = C0h
TEMPERATURE (癈)
40
I
7.00
7.50
7.25
7.75
8.00
1.7500
1.8125
1.8750
1.9375
2.0000
0
40
4266 G13
80
120
V
DD
 = 3.3V
V
EE
 = 54V
R
SENSE
 = 0.25?/DIV>
REG 47h = E2h
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