LTC4263CS#TRPBF Linear Technology, LTC4263CS#TRPBF Datasheet - Page 4

• Manufacturer Part Number: LTC4263CS#TRPBF
• Description: IC IEEE 803.2AF CNTRLR 14-SOIC
• Manufacturer: Linear Technology
• Type: Power Over Ethernet (PoE)r

Specifications of LTC4263CS#TRPBF

• Applications: Power Interface Switch for Power Over Ethernet (PoE) Devices
• Voltage - Supply: 48V
• Operating Temperature: 0°C ~ 70°C
• Mounting Type: Surface Mount
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• 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
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 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 operates with a negative supply voltage. To avoid
confusion, voltages in this data sheet are referred to in terms of absolute
magnitude.
temperature range, otherwise specifi cations are at T
relative to V
SYMBOL
A
I
I
V
Digital Interface (Note 10)
V
V
V
V
I
I
Timing Characteristics
t
t
t
t
t
t
t
t
t
t
t
4
ACDMAX
ACDMIN
OLEG
FLT
DET
DETDLY
PDC
PON
RISE
OVLD
ED
MPDO
MPS
DBO
DISDLY
VACD
ACDEN
OLED
ILD
IHD
OZ
Maximum Allowed Leakage of External Components
at Legacy Pin in Force Power-On Mode
PARAMETER
Voltage Gain OSC to ACOUT
AC Disconnect Output Current
Remain Connected AC Pin Current
AC Disconnect Enable Signal
LED Output Low Voltage
Digital Input Low Voltage
Digital Input High Voltage
Voltage of Legacy Pin if Left Floating
Current In/Out of Legacy Pin
Detection Time
Detection Delay
Classifi cation Duration
Power Turn-On Delay
Turn-On Rise Time
Overload/Short-Circuit Time Limit
Error Delay
Maintain Power Signature (MPS) Disconnect Delay PD Removal to Power Removal
MPS Minimum Pulse Width
Midspan Mode Detection Backoff
Power Removal Detection Delay
SS
unless otherwise noted. (Notes 2, 5)
SS
+ 80V.
SS
unless otherwise
A
= 25°C. V
CONDITIONS
2V ≤ (V
V
V
V
I
MIDSPAN, PWRMGT, ENFCLS, SD LEGACY
MIDSPAN, PWRMGT, ENFCLS, SD LEGACY
0V ≤ (V
Beginning to End of Detection
PD Insertion to Detection Complete
End of Valid Detect to Application of Power
V
C
I
PD Minimum Current Pulse Width
Required to Stay Connected (Note 11)
R
LED
CUT
The
OSC
OSC
OSC
DD48
PSE
PORT
= 10mA
Fault to Next Detect
= 0.1μF
– V
– V
– V
l
– V
= 15.5kΩ
DD48
OSC
LEGACY
SS
SS
SS
denotes the specifi cations which apply over the full operating
OUT
, Port On
– V
= 2V, 0V ≤ (V
= 2V
– V
: 10% to 90%
Note 6: If the ENFCLS pin is high, I
classifi cation. If ENFCLS pin is low, I
Note 7: In order to reduce power dissipated in the switch while charging
the PD, the LTC4263 reduces the current limit when V
Refer to the Typical Performance Characteristics for more information.
Note 8: The LTC4263 includes a high speed current limit circuit intended to
protect against faults. The fault protection is activated for port current
in excess of I
circuit current limit (I
levels.
Note 9: Class 4 or higher classifi cation current is treated as Class 3.
Note 10: The LTC4263 digital interface operates with respect to V
logic levels are measured with respect to V
Note 11: 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
– V
MPS
SS
SS
) ≤ 3V
SS
within any t
= 48V and V
) ≤ 5V
ACOUT
FAULT
MPDO
– V
. After the high speed current limit activates, the short-
DD5
SS
LIM
) ≤ 4V
time window.
not driven externally. All voltages are
) engages and restricts current to IEEE 802.3af
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
CUT
CUT
0.95
MIN
130
–60
–10
270
300
135
320
1.5
2.2
2.2
1.1
3.8
3.0
0.8
–1
34
40
52
depends on the result of
reverts to its Class 0 specifi cation.
SS
.
1.25
0.95
TYP
160
290
145
170
350
1.0
1.1
4.0
3.2
37
62
OUT
– V
MAX
1.05
190
310
620
155
380
2.2
0.8
0.4
1.4
4.2
3.4
1.1
60
10
39
72
20
1
SS
is large.
SS
. All
UNITS
4263fe
V/V
mA
ms
ms
ms
ms
ms
ms
ms
μA
μA
μA
μs
V
V
V
V
V
V
s
s
s