LTC4278CDKD#PBF Linear Technology, LTC4278CDKD#PBF Datasheet - Page 4

• 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
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
4
PARAMETER
PWM Controller (Note 10)
Power Supply
V
V
V
Feedback Amplifi er
Feedback Regulation Voltage (V
Feedback Pin Input Bias Current
Feedback Amplifi er Transconductance
Feedback Amplifi er Source or Sink Current
Feedback Amplifi er Clamp Voltage
Reference Voltage Line Regulation
Feedback Amplifi er Voltage Gain
Soft-Start Charging Current
Soft-Start Discharge Current
Control Pin Threshold (V
Gate Outputs
PG, SG Output High Level
PG, SG Output Low Level
PG, SG Output Shutdown Strength
PG Rise Time
SG Rise Time
PG, SG Fall Time
Current Amplifi er
Switch Current Limit at Maximum V
ΔV
Sense Voltage Overcurrent Fault Voltage
Timing
Switching Frequency (f
Oscillator Capacitor Value (C
Minimum Switch On Time (t
Flyback Enable Delay Time (t
PG Turn-On Delay Time (t
Maximum Switch Duty Cycle
SYNC Pin Threshold
SYNC Pin Input Resistance
CC
CC
CC
SENSE
Operating Range
Supply Current (I
Shutdown Current
/ΔV
CMP
CC
OSC
)
CMP
PGDLY
)
ON(MIN)
OSC
ENDLY
)
)
FB
)
)
)
)
CMP
CONDITIONS
V
V
R
ΔI
V
V
12V ≤ V
V
V
V
Duty Cycle = Min
V
C
C
C
V
V
C
(Note 12)
CMP
CMP
FB
FB
CMP
SFST
SFST
UVLO
PG
SG
PG
SENSE
SENSE
OSC
CMP
C
, C
= ±10μA
= 0.9V
= 1.4V
= 1nF
= 1nF
= 100pF
= Open (Note 11)
= Open, V
= 1.2V to 1.7V
Open
= 1.5V
= 1.5V, V
SG
= 0V; I
+
+
CC
, V
= 1nF
A
SFST
≤ 18V
= 25°C.
PG
UVLO
< 1V
, I
UVLO
SG
The
= 0V
= 20mA
= 0V
l
denotes the specifi cations which apply over the full operating
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
1.220
MIN
700
4.5
0.7
6.6
25
16
88
84
33
85
4
1.237
0.005
1000
1400
2.56
0.84
0.01
0.07
1.53
TYP
200
206
100
200
265
200
6.4
1.3
7.4
1.6
50
55
20
11
15
10
98
88
40
1
1.251
MAX
1400
0.05
0.05
150
110
230
110
200
2.3
2.1
20
10
90
25
8
UNITS
μmho
4278fa
%/ V
V/ V
V/ V
kHz
mA
mA
mV
mV
kΩ
μA
nA
μA
μA
ns
ns
ns
pF
ns
ns
ns
%
V
V
V
V
V
V
V
V
V