LTC4263IDE-1#TRPBF Linear Technology, LTC4263IDE-1#TRPBF Datasheet - Page 4

• Manufacturer Part Number: LTC4263IDE-1#TRPBF
• Description: IC IEEE 803.2AF CNTRLR 14-DFN
• Manufacturer: Linear Technology
• Type: Power Over Ethernet (PoE)r

Specifications of LTC4263IDE-1#TRPBF

• Applications: Power Interface Switch for Power Over Ethernet (PoE) Devices
• Voltage - Supply: 48V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 14-DFN
• Current - Supply: 1mA
• Interface: IEEE 802.3af
• Controller Type: Power Sourcing Equipment Controller (PSE)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ELECTRICAL CHARACTERISTICS
LTC4263-1
temperature range, otherwise specifi cations are at T
relative to V
SYMBOL
Timing Characteristics
t
t
t
t
t
t
t
t
t
t
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to V
specifi ed.
Note 3: 80mA of current may be pulled from the OUT or ACOUT pin
without damage whether the LTC4263-1 is powered or not. These pins will
also withstand a positive voltage of V
Note 4: This IC includes overtemperature protection that is intended
to protect the device during momentary overload conditions. Junction
temperature will exceed 125°C when overtemperature protection is active.
Continuous operation above the specifi ed maximum operating junction
temperature may impair device reliability.
Note 5: The LTC4263-1 operates with a negative supply voltage. To avoid
confusion, voltages in this data sheet are referred to in terms of absolute
magnitude.
4
DET
DETDLY
PON
RISE
OVLD
ED
MPDO
MPS
DBO
DISDLY
SS
unless otherwise noted. (Note 2, Note 5)
PARAMETER
Detection Time
Detection Delay
Power Turn-On Delay
Turn-On Rise Time
Overload/Short-Circuit Time Limit
Error Delay
Maintain Power Signature (MPS)
Disconnect Delay
MPS Minimum Pulse Width
Midspan Mode Detection Backoff
Power Removal Detection Delay
SS
+ 80V.
SS
unless otherwise
A
= 25°C. V
CONDITIONS
Beginning to End of Detection
PD Insertion to Detection Complete
End of Valid Detect to Application of Power
V
C
I
PD Removal to Power Removal
PD Minimum Current Pulse Width
Required to Stay Connected (Note 9)
R
CUT
DD48
PSE
PORT
The
Fault to Next Detect
= 0.1μF
– V
= 15.5kΩ
l
DD48
OUT
denotes the specifi cations which apply over the full operating
: 10% to 90%
– V
Note 6: In order to reduce power dissipated in the switch while charging
the PD, the LTC4263-1 reduces the current limit when V
Refer to the Typical Performance Characteristics for more information.
Note 7: The LTC4263-1 includes a high-speed current limit circuit
intended to protect against faults. The fault protection is activated
for port current in excess of I
activates, the short-circuit current limit (I
current to IEEE 802.3af levels.
Note 8: The LTC4263-1 digital interface operates with respect to V
All logic levels are measured with respect to V
Note 9: The IEEE 802.3af specifi cation allows a PD to present its
Maintain Power Signature (MPS) on an intermittent basis without being
disconnected. In order to stay powered, the PD must present the MPS for
t
MPS
SS
within any t
= 48V and V
MPDO
DD5
time window.
not driven externally. All voltages are
l
l
l
l
l
l
l
l
l
l
FAULT
. After the high-speed current limit
MIN
270
300
135
320
3.8
3.0
0.8
40
52
LIM
) engages and restricts
SS
0.95
TYP
290
145
170
350
4.0
3.2
62
.
OUT
MAX
310
620
155
380
4.2
3.4
1.1
72
20
– V
SS
is large.
SS
.
UNITS
42631fa
ms
ms
ms
ms
ms
ms
μs
s
s
s