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LTC4267 Datasheet(PDF) 3 Page - Linear Technology

Part No. LTC4267
Description  Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
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Maker  LINER [Linear Technology]
Homepage  http://www.linear.com
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LTC4267 Datasheet(HTML) 3 Page - Linear Technology

 
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LTC4267
3
4267f
ELECTRICAL CHARACTERISTICS The denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. (Note 3)
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VMARGIN
VCLAMP1mA – VTURNON Margin
0.05
0.6
V
IVPORTN_ON
VPORTN Supply Current when ON
VPORTN = –48V, POUT, ⎯P⎯W⎯R⎯G⎯D, SIGDISA Floating
3
mA
IPVCC_ON
PVCC Supply Current
(Note 7)
Normal Operation
VITH/RUN – PGND = 1.3V
240
350
µA
Start-Up
PVCC – PGND = VTURNON – 100mV
40
90
µA
IVPORTN_CLASS VPORTN Supply Current
VPORTN = –17.5V, POUT Tied to VPORTP, RCLASS,
0.35
0.5
0.65
mA
During Classification
SIGDISA Floating (Note 8)
∆ICLASS
Current Accuracy
10mA < ICLASS < 40mA, –12.5V ≤ VPORTN ≤ –21V
±3.5
%
During Classification
(Notes 9, 10)
RSIGNATURE
Signature Resistance
–1.5V ≤ VPORTN ≤ – 9.5V, POUT Tied to VPORTP,
23.25
26.00
IEEE 802.3af 2-Point Measurement (Notes 4, 5)
RINVALID
Invalid Signature Resistance
–1.5V ≤ VPORTN ≤ – 9.5V, SIGDISA and POUT Tied to
9
11.8
VPORTP, IEEE 802.3af 2-Point Measurement
(Notes 4, 5)
VIH
Signature Disable
With Respect to VPORTN
3
57
V
High Level Input Voltage
High Level Invalidates Signature (Note 11)
VIL
Signature Disable
With Respect to VPORTN
0.45
V
Low Level Input Voltage
Low Level Enables Signature
RINPUT
Signature Disable, Input Resistance
With Respect to VPORTN
100
VPG_OUT
Power Good Output Low Voltage
I = 1mA VPORTN = –48V,
0.5
V
⎯P⎯W⎯R⎯G⎯D Referenced to VPORTN
Power Good Trip Point
VPORTN = –48V, Voltage between VPORTN and POUT
VPG _FALL
POUT Falling
1.3
1.5
1.7
V
VPG_RISE
POUT Rising
2.7
3.0
3.3
V
IPG_LEAK
Power Good Leakage Current
VPORTN = 0V, ⎯P⎯W⎯R⎯G⎯D FET Off, V⎯P⎯W⎯R⎯G⎯D = 57V
1
µA
RON
On-Resistance
I = 350mA, VPORTN = –48V, Measured from
1.0
1.6
Ω
VPORTN to POUT (Note 10)
2
Ω
VITHSHDN
Shutdown Threshold (at ITH/RUN)
PVCC – PGND = VTURNON + 100mV
0.15
0.28
0.45
V
ITHSTART
Start-Up Current Source at ITH/RUN
VITH/RUN – PGND = 0V, PVCC – PGND = 8V
0.2
0.3
0.4
µA
VFB
Regulated Feedback Voltage
Referenced to PGND, PVCC – PGND = 8V (Note 12)
0.780
0.800
0.812
V
IFB
VFB Input Current
PVCC – PGND = 8V (Note 12)
10
50
nA
gm
Error Amplifier Transconductance
ITH/RUN Pin Load = ±5µA (Note 12)
200
333
500
µA/V
∆VO(LINE)
Output Voltage Line Regulation
VTURNOFF < PVCC < VCLAMP (Note 12)
0.05
mV/V
∆VO(LOAD)
Output Voltage Load Regulation
ITH/RUN Sinking 5µA, PVCC – PGND = 8V (Note 12)
3
mV/µA
ITH/RUN Sourcing 5µA, PVCC – PGND = 8V (Note 12)
3
mV/µA
IPOUT_LEAK
POUT Leakage
VPORTN = 0V, Power MOSFET Off,
150
µA
POUT = 57V (Note 13)
ILIM_HI
Input Current Limit, High Level
VPORTN = –48V, POUT = –43V (Note 14, 15)
0°C ≤ TA ≤ 70°C
325
375
400
mA
– 40°C ≤ TA ≤ 85°C
300
375
400
mA
ILIM_LO
Input Current Limit, Low Level
VPORTN = –48V, POUT = –43V (Note 14, 15)
80
140
180
mA
fOSC
Oscillator Frequency
VITH/RUN – PGND = 1.3V, PVCC – PGND = 8V
180
200
240
kHz
DCON(MIN)
Minimum Switch On Duty Cycle
VITH/RUN – PGND = 1.3V, VFB – PGND = 0.8V,
6
8
%
PVCC – PGND = 8V
DCON(MAX)
Maximum Switch On Duty Cycle
VITH/RUN – PGND = 1.3V, VFB – PGND = 0.8V,
70
80
90
%
PVCC – PGND = 8V


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