LTC4278CDKD#PBF Linear Technology, LTC4278CDKD#PBF Datasheet - Page 2

• 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

ABSOLUTE MAXIMUM RATINGS
ORDER INFORMATION
LTC4278
(Notes 1, 2)
Pins with Respect to V
V
V
V
SHDN ....................................................... –0.3V to 100V
R
R
PWRGD Voltage (Note 3)
PWRGD, T2P Voltage ............................... –0.3V to 100V
PWRGD, T2P Sink Current .....................................10mA
Pins with Respect to GND
V
SENSE
UVLO, SYNC Voltage ...................................–0.3V to V
FB Current ..............................................................±2mA
V
Operating Ambient Temperature Range
LTC4278C-1 ................................................. 0°C to 70°C
LTC4278I-1 ..............................................–40°C to 85°C
LEAD FREE FINISH
LTC4278CDKD#PBF
LTC4278IDKD#PBF
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges. *The temperature grade is identifi ed by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based fi nish parts.
For more information on lead free part marking, go to:
For more information on tape and reel specifi cations, go to:
2
PORTP
NEG
NEG
CC
CMP
CLASS
CLASS
Low Impedance Source ......V
Sink Current .........................................................5mA
Voltage ................................................ –0.3V to 22V
Voltage ......................................... –0.3V to V
Pull-Up Current ..................................................1A
Current .........................................................±1mA
–
, Voltage ............................................ –0.3V to 7V
Voltage ......................................... –0.3V to 100V
Source Current ...........................................50mA
, SENSE
+
Voltage ........................ –0.5V to +0.5V
TAPE AND REEL
LTC4278CDKD#TRPBF
LTC4278IDKD#TRPBF
PORTN
NEG
–0.3V to V
http://www.linear.com/leadfree/
PART MARKING*
4278
4278
http://www.linear.com/tapeandreel/
NEG
PORTP
+11V
CC
PIN CONFIGURATION
PACKAGE DESCRIPTION
32-Lead (7mm × 4mm) Plastic DFN
32-Lead (7mm × 4mm) Plastic DFN
GND, EXPOSED PAD (PIN 33) MUST BE SOLDERED TO A
HEAT SINKING PLANE THAT IS CONNECTED TO V
V
V
R
T
ENDLY
PORTN
PORTN
SHDN
CLASS
SYNC
32-LEAD (7mm × 4mm) PLASTIC DFN
JMAX
SFST
OSC
T2P
V
t
NC
NC
NC
SG
ON
CC
FB
= 125°C, θ
10
11
12
13
14
15
16
1
2
3
4
5
6
7
8
9
DKD32 PACKAGE
TOP VIEW
JA
33
= 34°C/W, θ
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
JC
= 2°C/W
TEMPERATURE RANGE
0°C to 70°C
–40°C to 85°C
V
NC
PWRGD
PWRGD
NC
V
V
NC
PG
PGDLY
R
C
SENSE
SENSE
UVLO
V
PORTP
NEG
NEG
CMP
CMP
CMP
+
–
NEG
4278fa