ltc4266a Linear Technology Corporation, ltc4266a Datasheet - Page 7

• Manufacturer Part Number: ltc4266a
• Description: Quad Poe/poe+/ltpoe++ Pse Controller
• Manufacturer: Linear Technology Corporation

VOLTAGE
TYPICAL PERFORMANCE CHARACTERISTICS
10V/DIV
–17.6
PORT
GND
–10
–20
–30
–40
–50
–60
–70
V
1.8
1.7
1.6
1.5
1.4
1.3
1.2
1.1
1.0
0.9
0.8
10
EE
0
2.7
Power-On Sequence in
AUTO Pin Mode
2-Event Classification in
AUTO Pin Mode
V
GND
V
PORT 1
V
V
PD IS CLASS 4
PORT 1
V
V
DD
EE
DD
EE
FORCED CURRENT DETECTION
DD
EE
2.9
= –55V
= –54V
= 3.3V
= 3.3V
Supply Current vs Voltage
1ST CLASS EVENT
3.1
V DD SUPPLY VOLTAGE (V)
FORCED VOLTAGE
25°C
DETECTION
3.3
100ms/DIV
10ms/DIV
CLASSIFICATION
2ND CLASS EVENT
3.5
POWER ON
802.3af
–40°C
3.7
85°C
3.9
4.1
4266AC G04
4266AC G07
4266AC G01
4.3
200 mA/DIV
20mA/DIV
CURRENT
VOLTAGE
CURRENT
VOLTAGE
VOLTAGE
20V/DIV
10V/DIV
1V/DIV
PORT
PORT
PORT
PORT
GATE
2.3
2.1
2.0
2.4
2.2
–60
40mA
V
–20V
GND
0mA
0mA
EE
V
V
EE
EE
–55 –50 –45 –40
Supply Current vs Voltage
Powering Up into a 180μF Load
Classification Transient Response
to 40mA Load Step
V
V
V
V
FOLDBACK
DD
EE
DD
EE
V EE SUPPLY VOLTAGE (V)
= –54V
= –54V
= 3.3V
= 3.3V
25°C
FET ON
–40°C
CURRENT LIMIT
50μs/DIV
5ms/DIV
–35 –30 –25 –20
85°C
425mA
4266 G08
LOAD
FULLY
CHARGED
4266AC G02
4266AC G05
LTC4266A/LTC4266C
211
215
214
213
212
210
VOLTAGE
10V/DIV
–40
–18.4
PORT
802.3at I
vs Temperature
GND
–10
–12
–14
–16
–18
–20
V
V
V
R
REG 48h = C0h
–2
–4
–6
–8
EE
DD
EE
SENSE
0
0
= –54V
802.3af Classification in
AUTO Pin Mode
Classification Current Compliance
= 3.3V
V
V
T
PORT 1
V
PD IS CLASS 1
V
A
DD
EE
DD
EE
= 0.25Ω
= 25°C
0
= –54V
10
= –55V
= 3.3V
= 3.3V
LIM
CLASSIFICATION CURRENT (mA)
TEMPERATURE (°C)
Threshold
20
40
30
5ms/DIV
40
–80
50
4266AC G09
60
120
4266AC G03
4266AC G06
4266acfa
856
844
840
860
852
848
7
70