LTC4267IGN-1#TRPBF Linear Technology, LTC4267IGN-1#TRPBF Datasheet - Page 18

• Manufacturer Part Number: LTC4267IGN-1#TRPBF
• Description: IC POE 802.3AF INTERFACE 16SSOP
• Manufacturer: Linear Technology

Specifications of LTC4267IGN-1#TRPBF

• Controller Type: Power over Ethernet Controller (POE)
• Interface: IEEE 802.3af
• Current - Supply: 3mA
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 16-SSOP
• Linear Misc Type: Negative Voltage
• Package Type: SSOP N
• Operating Supply Voltage (max): -57V
• Operating Temperature (min): -40C
• Operating Temperature (max): 85C
• Operating Temperature Classification: Industrial
• Product Depth (mm): 3.99mm
• Product Height (mm): 1.5mm
• Mounting: Surface Mount
• Pin Count: 16
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Voltage - Supply: -
• Lead Free Status / Rohs Status: Compliant

LTC4267-1
designer should determine which power category the PD
falls into and then select the appropriate value of R
from Table 2. If a unique load current is required, the value
of R
where I
classifi cation and is given in the electrical specifi cations.
The R
grading the overall accuracy of the classifi cation circuit.
18
APPLICATIO S I FOR ATIO
R
CLASS
CLASS
CLASS
IN_CLASS
can be calculated as:
= 1.237V/(I
resistor must be 1% or better to avoid de-
is the LTC4267-1 IC supply current during
U
DESIRED
Figure 10. PD Front End with Isolation Transformer, 2nd Schottky Diode Bridge
U
– I
IN_CLASS
W
)
U
CLASS
Resistor power dissipation will be 50mW maximum and
is transient so heating is typically not a concern. In order
to maintain loop stability, the layout should minimize
capacitance at the R
can be disabled by fl oating the R
should not be shorted to V
LTC4267-1 classifi cation circuit to attempt to source very
large currents and quickly go into thermal shutdown.
CLASS
node. The classifi cation circuit
PORTN
CLASS
as this would force the
pin. The R
CLASS
42671f
pin