LTC4278CDKD#PBF Linear Technology, LTC4278CDKD#PBF Datasheet - Page 3

• 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

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
PARAMETER
Interface Controller (Note 4)
Operating Input Voltage
ON/OFF Hysteresis Window
Signature/Class Hysteresis Window
Reset Threshold
Supply Current
Supply Current at 57V
Class 0 Current
Signature
Signature Resistance
Invalid Signature Resistance, SHDN Invoked
Invalid Signature Resistance During Mark Event (Notes 6, 7)
Classifi cation
Class Accuracy
Classifi cation Stability Time
Normal Operation
Inrush Current
Power FET On-Resistance
Power FET Leakage Current at V
Digital Interface
SHDN Input High Level Voltage
SHDN Input Low Level Voltage
SHDN Input Resistance
PWRGD, T2P Output Low Voltage
PWRGD, T2P Leakage Current
PWRGD Output Low Voltage
PWRGD Clamp Voltage
PWRGD Leakage Current
Signature Range
Classifi cation Range
ON Voltage
OFF Voltage
Overvoltage Lockout
NEG
CONDITIONS
At V
State Machine Reset for 2-Event Classifi cation
Measured at V
V
1.5V ≤ V
1.5V ≤ V
10mA < I
(Notes 8, 9)
V
3.5% of Ideal Value (Notes 8, 9)
V
Tested at 600mA into V
V
V
Tested at 1mA, V
2-Event Classifi cation to See Active Low
Pin Voltage Pulled 57V, V
Tested at 0.5mA, V
Voltage Is With Respect to V
Tested at 2mA, V
V
PORTP
PORTP
PORTP
PORTP
PORTP
PWRGD
PORTP
= 17.5V, No R
Pin Step to 17.5V, R
= 54V, V
= SHDN = V
= 9.8V, SHDN = 9.65V
= 11V, V
PORTP
PORTP
CLASS
A
(Note 5)
= 25°C.
PORTP
≤ 9.8V (Note 6)
≤ 9.8V, V
< 40mA, 12.5V < V
NEG
NEG
PORTP
NEG
The
PORTP
NEG
= 3V
Pin
= 0V, Voltage With Respect to V
= 0V, Voltage With Respect to V
CLASS
l
NEG
= 54V. For T2P, Must Complete
SHDN
= 57V
PORTP
= 52V, V
denotes the specifi cations which apply over the full operating
, V
Resistor
CLASS
NEG
= 3V (Note 6)
PORTP
= V
NEG
= 30.9, I
PORTP
PORTN
= 54V
= 48V, Output
< 21V
= 0V
CLASS
Within
NEG
NEG
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
23.25
12.5
30.0
2.57
MIN
100
1.5
4.1
1.4
60
12
3
TYP
100
0.7
71
LTC4278
MAX
37.2
5.40
1.35
0.40
±3.5
0.45
0.15
16.5
180
9.8
1.0
0.4
60
21
26
11
11
1
1
1
1
UNITS
4278fa
3
mA
mA
mA
kΩ
kΩ
kΩ
ms
kΩ
μA
μA
μA
%
Ω
V
V
V
V
V
V
V
V
V
V
V
V
V
V