LTC4266 LINER [Linear Technology], LTC4266 Datasheet - Page 8

• Manufacturer Part Number: LTC4266
• Description: Quad IEEE 802.3at Power over Ethernet Controller
• Manufacturer: LINER [Linear Technology]

LTC4266
8
TYPICAL PERFORMANCE CHARACTERISTICS
900
800
700
600
500
400
300
200
100
0
–54
Current Limit Foldback
–45
107.25
105.00
108.00
106.50
105.75
96.00
95.25
94.50
93.75
93.00
–36
–40
–40
802.3af I
Temperature
802.3af I
Temperature
V
OUTn
V
V
R
REG 48h = 80h
PORT 1
V
V
R
REG 47h = D4h
PORT 1
DD
EE
SENSE
DD
EE
SENSE
–27
= –54V
= –54V
= 3.3V
= 3.3V
(V)
= 0.25
= 0.25
V
V
R
REG 48h = C0h
–18
0
0
LIM
CUT
DD
EE
SENSE
TEMPERATURE (°C)
TEMPERATURE (°C)
= –54V
= 3.3V
Threshold vs
Threshold vs
= 0.25
–9
40
40
4266 G14
0
0
225
200
175
150
125
100
75
50
25
80
80
4266 G10
4266 G12
120
120
400
350
300
250
200
150
100
50
432
429
426
423
420
384
381
378
375
372
0
ADC Noise Histogram
Current Readback in Fast Mode
V
SENSEn
191
– V
192
EE
= 110.4mV
ADC OUTPUT
193
194
1.9375
1.8125
1.7500
2.0000
1.8750
162
158
163
161
160
159
195
–40
–40
802.3at I
Temperature
DC Disconnect Threshold vs
Temperature
V
V
R
REG 47h = E2h
PORT 1
V
V
R
REG 47h = E2h
PORT 1
DD
EE
SENSE
DD
EE
SENSE
= –54V
= 3.3V
196
4266 G15
= –54V
= 3.3V
= 0.25
= 0.25
0
CUT
0
TEMPERATURE (°C)
TEMPERATURE (°C)
Threshold vs
–0.5
–1.0
1.0
0.5
0
40
CURRENT SENSE RESISTOR INPUT VOLTAGE (mV)
40
0
ADC Integral Nonlinearity
Current Readback in Fast Mode
50
100
80
80
150
200 250
4266 G11
4266 G13
120
120
636
652
648
644
640
630
7.75
7.00
8.00
7.50
7.25
300
350
400
450
4266 G16
4266fb
500