LTC4266 LINER [Linear Technology], LTC4266 Datasheet - Page 7

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

VOLTAGE
10V/DIV
TYPICAL PERFORMANCE CHARACTERISTICS
–17.6
PORT
GND
–60
–70
–10
–20
–30
–40
–50
V
0.9
0.8
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
10
EE
0
2.7
Power On Sequence
in AUTO Pin Mode
V
2-Event Classification
in Auto Pin Mode
GND
V
PORT 1
V
V
PORT 1
V
V
PD IS CLASS 4
DD
EE
DD
EE
FORCED CURRENT DETECTION
DD
EE
2.9
= –54V
= –55V
= 3.3V
= 3.3V
Supply Current vs Voltage
1ST CLASS EVENT
–40°C
25°C
85°C
3.1
V DD SUPPLY VOLTAGE (V)
FORCED VOLTAGE
DETECTION
3.3
100ms/DIV
10ms/DIV
CLASSIFICATION
2ND CLASS EVENT
POWER ON
3.5
802.3af
3.7
3.9
4.1
4266 G04
4266 G01
4266 G07
4.3
200 mA/DIV
20mA/DIV
CURRENT
CURRENT
VOLTAGE
VOLTAGE
VOLTAGE
20V/DIV
10V/DIV
1V/DIV
2.1
2.4
2.3
2.2
2.0
PORT
PORT
PORT
PORT
GATE
–60
V
EE
40mA
GND
0mA
0mA
–20V
–55 –50 –45 –40
V
V
Supply Current vs Voltage
EE
EE
Classification Transient Response
to 40mA Load Step
Powering Up into a 180µF Load
–40°C
25°C
85°C
V
V
V EE SUPPLY VOLTAGE (V)
V
V
FOLDBACK
DD
EE
DD
EE
= –54V
= –54V
= 3.3V
= 3.3V
FET ON
–35 –30 –25 –20
CURRENT LIMIT
5ms/DIV
50µs/DIV
425mA
4266 G08
LOAD
FULLY
CHARGED
4266 G02
4266 G05
211
215
214
213
212
210
VOLTAGE
–40
10V/DIV
802.3at I
Temperature
–18.4
PORT
V
V
R
REG 48h = C0h
GND
–10
–12
–14
–16
–18
–20
DD
EE
SENSE
V
–2
–4
–6
–8
EE
0
= –54V
= 3.3V
0
802.3af Classification
in AUTO Pin Mode
Classification Current Compliance
V
V
T
= 0.25
PORT 1
V
V
PD IS CLASS 1
A
DD
EE
0
DD
EE
LIM
= 25°C
TEMPERATURE (°C)
= –54V
10
= 3.3V
= –55V
= 3.3V
Threshold vs
CLASSIFICATION CURRENT
20
40
30
5ms/DIV
LTC4266
–80
40
50
4266 G09
120
60
856
844
840
860
852
848
4266fb
4266 G06
7
4266 G03
70