LTC4278CDKD#PBF Linear Technology, LTC4278CDKD#PBF Datasheet - Page 12

• 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
BLOCK DIAGRAM
12
18
15
13
11
23
12
25
28
10
1
2
3
4
5
6
7
8 NC
SHDN
R
NC
V
V
NC
V
UVLO
OSC
SYNC
t
PGDLY
ENDLY
NC
NC
T2P
ON
CLASS
PORTN
PORTN
CC
0.8V
+
–
OSCILLATOR
DISABLE
REFERENCE
1.237V
(V
I
UVLO
FB
)
+
–
SET
TSD
UVLO
+
–
1.237V
CONTROL
CIRCUITS
REGULATOR
CLASSIFICATION
CURRENT LOAD
INTERNAL
BLOCK
LOGIC
CURRENT TRIP
SLOPE COMPENSATION
–
+
ENABLE
PGATE
SGATE
3V
0.7
1.3
CLAMPS
BOLD LINE INDICATES
HIGH CURRENT PATH
16k
S
R
COMPARATOR
–
+
CURRENT
Q
Q
25k
COLLAPSE DETECT
TO FB
ERROR AMP
14V
–
+
–
+
+
–
1V
GATE DRIVE
GATE DRIVE
+
R
50k
CMPF
3V
OVERCURRENT
FAULT
–
–
+
–
CURRENT
SENSE AMP
LOAD
COMPENSATION
(EXPOSED PAD)
+
PWRGD
PWRGD
V
SENSE
SENSE
PORTP
V
V
V
C
R
SFST
GND
NEG
NEG
CMP
CMP
CMP
NC
PG
SG
4278 BD
FB
–
+
32
31
30
29
27
26
16
17
14
19
20
21
22
24
33
9
4278fa