Linear Technology LTC4278 IEEE802.3at PD Controller with 12V Aux, Vout = 5V, Iout = 4.5A DC1561B DC1561B 데이터 시트
제품 코드
DC1561B
LTC4278
3
4278fc
ELECTRICAL CHARACTERISTICS
The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Interface Controller (Note 4)
Operating Input Voltage
Operating Input Voltage
Signature Range
Classification Range
ON Voltage
OFF Voltage
Overvoltage Lockout
At V
PORTP
(Note 5)
l
l
l
l
1.5
12.5
30.0
71
60
9.8
21
37.2
V
V
V
V
V
V
ON/OFF Hysteresis Window
l
4.1
V
Signature/Class Hysteresis Window
l
1.4
V
Reset Threshold
State Machine Reset for 2-Event Classification
l
2.57
5.40
V
Supply Current
Supply Current at 57V
Supply Current at 57V
Measured at V
PORTP
Pin
l
1.35
mA
Class 0 Current
V
PORTP
= 17.5V, No R
CLASS
Resistor
l
0.40
mA
Signature
Signature Resistance
Signature Resistance
1.5V ≤ V
PORTP
≤ 9.8V (Note 6)
l
23.25
26
kΩ
Invalid Signature Resistance, SHDN Invoked 1.5V ≤ V
PORTP
≤ 9.8V, V
SHDN
= 3V (Note 6)
l
11
kΩ
Invalid Signature Resistance During Mark
Event
(Notes 6, 7)
l
11
kΩ
Classification
Class Accuracy
Class Accuracy
10mA < I
CLASS
< 40mA, 12.5V < V
PORTP
< 21V
(Notes 8, 9)
l
±3.5
%
Classification Stability Time
V
PORTP
Pin Step to 17.5V, R
CLASS
= 30.9, I
CLASS
Within 3.5%
of Ideal Value (Notes 8, 9)
l
1
ms
Normal Operation
Inrush Current
Inrush Current
V
PORTP
= 54V, V
NEG
= 3V
l
60
100
180
mA
Power FET On-Resistance
Tested at 600mA into V
NEG
, V
PORTP
= 54V
l
0.7
1.0
Ω
Power FET Leakage Current at V
NEG
V
PORTP
= SHDN = V
NEG
= 57V
l
1
µA
Digital Interface
SHDN Input High Level Voltage
SHDN Input High Level Voltage
l
3
V
SHDN Input Low Level Voltage
l
0.45
V
SHDN Input Resistance
V
PORTP
= 9.8V, SHDN = 9.65V
l
100
kΩ
PWRGD, T2P Output Low Voltage
Tested at 1mA, V
PORTP
= 54V. For T2P, Must Complete
2-Event Classification to See Active Low
l
0.15
V
PWRGD, T2P Leakage Current
Pin Voltage Pulled 57V, V
PORTP
= V
PORTN
= 0V
l
1
µA
PWRGD Output Low Voltage
Tested at 0.5mA, V
PORTP
= 52V, V
NEG
= 48V, Output Voltage
Is With Respect to V
NEG
l
0.4
V
PWRGD Clamp Voltage
Tested at 2mA, V
NEG
= 0V, Voltage With Respect to V
NEG
l
12
16.5
V
PWRGD Leakage Current
V
PWRGD
= 11V, V
NEG
= 0V, Voltage With Respect to V
NEG
l
1
µA