LTC4267 LINER [Linear Technology], LTC4267 Datasheet - Page 3

• Manufacturer Part Number: LTC4267
• Description: Power over Ethernet IEEE 802.3af PD Interface with Integrated Switching Regulator
• Manufacturer: LINER [Linear Technology]

SYMBOL
V
I
I
I
∆I
R
R
V
V
R
V
V
V
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifi cations are at T
I
R
V
I
V
I
g
∆V
∆V
I
I
I
f
DC
DC
VPORTN_ON
PVCC_ON
VPORTN_CLASS
PG_LEAK
THSTART
FB
POUT_LEAK
LIM_HI
LIM_LO
OSC
MARGIN
IH
IL
PG_OUT
PG _FALL
PG_RISE
SIGNATURE
INVALID
INPUT
m
ITHSHDN
FB
ON
CLASS
O(LINE)
O(LOAD)
ON(MIN)
ON(MAX)
PARAMETER
V
V
P
V
During Classifi cation
Current Accuracy
During Classifi cation
Signature Resistance
Invalid Signature Resistance
Signature Disable
High Level Input Voltage
Signature Disable
Low Level Input Voltage
Signature Disable, Input Resistance
Power Good Output Low Voltage
Power Good Trip Point
Power Good Leakage Current
On-Resistance
Shutdown Threshold (at I
Start-Up Current Source at I
Regulated Feedback Voltage
V
Error Amplifi er Transconductance
Output Voltage Line Regulation
Output Voltage Load Regulation
P
Input Current Limit, High Level
Input Current Limit, Low Level
Oscillator Frequency
Minimum Switch On Duty Cycle
Maximum Switch On Duty Cycle
Normal Operation
Start-Up
CLAMP1mA
PORTN
VCC
PORTN
FB
OUT
Input Current
Supply Current
Leakage
Supply Current when ON
Supply Current
– V
TURNON
Margin
TH
/RUN)
TH
/RUN
CONDITIONS
V
(Note 7)
V
P
V
SIGDISA Floating (Note 8)
10mA < I
(Notes 9, 10)
–1.5V ≤ V
IEEE 802.3af 2-Point Measurement (Notes 4, 5)
–1.5V ≤ V
V
(Notes 4, 5)
With Respect to V
High Level Invalidates Signature (Note 11)
With Respect to V
Low Level Enables Signature
With Respect to V
I = 1mA V
⎯ P ⎯ W ⎯ R ⎯ G ⎯ D Referenced to V
V
P
P
V
I = 350mA, V
V
P
V
Referenced to PGND, P
P
I
V
I
I
V
P
V
0°C ≤ T
–40°C ≤ T
V
V
V
P
V
P
TH
TH
TH
PORTN
ITH
VCC
PORTN
PORTP
PORTN
OUT
OUT
PORTN
PORTN
VCC
ITH
VCC
TURNOFF
PORTN
OUT
PORTN
PORTN
ITH
ITH
VCC
ITH
VCC
/RUN Pin Load = ±5µA (Note 12)
/RUN Sinking 5µA, P
/RUN Sourcing 5µA, P
/RUN – PGND = 1.3V
/RUN – PGND = 0V, P
/RUN – PGND = 1.3V, P
/RUN – PGND = 1.3V, V
/RUN – PGND = 1.3V, V
A
– PGND = V
– PGND = V
Falling
Rising
= 57V (Note 13)
– P
– P
– P
= 25°C. (Note 3)
, IEEE 802.3af 2-Point Measurement
A
= –48V, P
= –17.5V, P
= –48V, Voltage between V
= 0V, ⎯ P ⎯ W ⎯ R ⎯ G ⎯ D FET Off, V
to P
= 0V, Power MOSFET Off,
= –48V, P
= –48V, P
GND
≤ 70°C
GND
GND
CLASS
PORTN
PORTN
< P
PORTN
A
OUT
≤ 85°C
The
PORTN
VCC
= 8V (Note 12)
= 8V
= 8V
< 40mA, –12.5V ≤ V
(Note 10)
≤ – 9.5V, P
≤ – 9.5V, SIGDISA and P
= –48V,
●
TURNON
TURNON
< V
OUT
OUT
OUT
PORTN
PORTN
PORTN
OUT
denotes the specifi cations which apply over the full operating
= –48V, Measured from
CLAMP
, ⎯ P ⎯ W ⎯ R ⎯ G ⎯ D , SIGDISA Floating
= –43V (Note 14, 15)
= –43V (Note 14, 15)
VCC
Tied to V
VCC
PORTN
– 100mV
+ 100mV
VCC
VCC
(Note 12)
OUT
– P
VCC
FB
FB
– P
– P
– P
– PGND = 0.8V,
– PGND = 0.8V,
GND
Tied to V
GND
⎯ P ⎯ W ⎯ R ⎯ G ⎯ D
– P
PORTP
GND
GND
PORTN
PORTN
GND
= 8V (Note 12)
= 8V (Note 12)
, R
= 8V (Note 12)
= 8V
= 57V
PORTP
= 8V
CLASS
OUT
and P
≤ –21V
Tied to
,
,
OUT
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
23.25
0.780
MIN
0.05
0.35
0.15
100
200
325
300
180
1.3
2.7
0.2
80
70
3
0.800
0.28
0.05
TYP
240
333
375
375
140
200
0.6
0.5
1.5
3.0
1.0
0.3
40
10
80
9
3
3
6
LTC4267
26.00
0.812
MAX
0.65
±3.5
11.8
0.45
0.45
350
500
150
400
400
180
240
0.5
1.7
3.3
1.6
0.4
90
57
50
90
3
1
2
8
mV/µA
mV/µA
UNITS
mV/V
µA/V
3
kHz
mA
mA
mA
mA
mA
4267f
kΩ
kΩ
kΩ
µA
µA
µA
µA
nA
µA
%
%
%
Ω
Ω
V
V
V
V
V
V
V
V