LTC4278CDKD#PBF Linear Technology, LTC4278CDKD#PBF Datasheet - Page 8

• Manufacturer Part Number: LTC4278CDKD#PBF
• Description: IC PD IEEE 802.3AT 25.5W 32-DFN
• Manufacturer: Linear Technology

Specifications of LTC4278CDKD#PBF

• Controller Type: Powered Device Interface Controller (PD)
• Interface: IEEE 802.3af
• Voltage - Supply: 4.5 V ~ 20 V
• Current - Supply: 6.4mA
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 32-DFN
• Input Voltage: 60V
• Supply Current: 1.35mA
• Digital Ic Case Style: DFN
• No. Of Pins: 32
• Duty Cycle (%): 88%
• Frequency: 100kHz
• Operating Temperature Range: °C To +70°C
• Msl: MSL 1 - Unlimited
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

LTC4278
TYPICAL PERFORMANCE CHARACTERISTICS
8
70
65
50
40
60
55
45
–50
Feedback Amplifi er Source and
Sink Current vs Temperature
–25
0
TEMPERATURE (°C)
1.250
1.245
1.235
1.230
1.225
1.220
1.240
SOURCE CURRENT
23
22
21
20
19
18
17
16
15
25
–50
–50
UVLO vs Temperature
Soft-Start Charge Current
vs Temperature
50
V
–25
–25
FB
= 1.1V
75
V
0
CURRENT
0
TEMPERATURE (°C)
TEMPERATURE (°C)
FB
SINK
100
= 1.4V
25
4278 G20
25
125
50
50
75
75
1100
1050
1000
950
900
100
100
–50
Feedback Amplifi er g
vs Temperature
4278 G23
4278 G25
125
125
–25
0
TEMPERATURE (°C)
25
50
m
75
3.7
3.4
3.3
3.2
3.0
3.6
3.5
3.1
80
70
60
50
40
30
20
10
0
–50
100
0
I
PG, SG Rise and Fall Times
vs Load Capacitance
UVLO
T
4278 G21
A
–25
= 25°C
1
125
Hysteresis vs Temperature
2
0
TEMPERATURE (°C)
3
CAPACITANCE (nF)
1700
1650
1600
1550
1500
1450
1400
1350
1300
1250
1200
1150
1100
FALL TIME
4
25
–50
Feedback Amplifi er Voltage Gain
vs Temperature
5
50
–25
6
RISE TIME
75
7
0
TEMPERATURE (°C)
8
100
4278 G24
4278 G26
9
25
125
10
50
75
100
4278 G22
4278fa
125