ltc4270 Linear Technology Corporation, ltc4270 Datasheet - Page 5

• Manufacturer Part Number: ltc4270
• Description: 12-port Poe/poe+/ltpoe++ Pse Controller
• Manufacturer: Linear Technology Corporation

ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
SYMBOL PARAMETER
V
V
V
V
Port Current Readback
Port Voltage Readback
LTC4270 Die Temperature
Digital Interface
V
V
CUT
LIM
MIN
SC
ILD
IHD
Overcurrent Sense Voltage
Overcurrent Sense in AUTO Pin Mode
Active Current Limit in 802.3af Compliant Mode
Active Current Limit in High Power Mode
Active Current Limit in AUTO Pin Mode
DC Disconnect Sense Voltage
Short-Circuit Sense
Resolution
LSB Weight
Conversion Period
Resolution
LSB Weight
Die Temperature Offset
Die Temperature LSB Weight
Digital Input Low Voltage
Digital Input High Voltage
Digital Output Voltage Low
Internal Pull Up to V
Internal Pull Down To DGND
DD
A
= 25°C. (Notes 3 & 4)
CONDITIONS
V
hpen = 0Fh, cutn = D4h
hpen = 0Fh, cutn = E2h (Note 12)
Class 0, Class 3
Class 1
Class 2
Class 4
V
V
AGND – V
hpen = 0Fh, limn = C0h
V
V
AGND – V
V
Class 0 to Class 3
Class 4
V
V
V
rdis bit = 1 (Note 12)
No Missing Codes
V
No Missing Codes
V
Temperature Register = 00h (Note 7)
(Note 7)
(Note 6)
(Note 6)
I
I
ADn, RESET, MSD, INT, GPn
AUTO, MID
SDAOUT
SDAOUT
SENSEn
SENSEn
EE
OUT
EE
EE
SENSE
SENSE
SENSEn
SENSEn
SENSEn
< V
+ 23V < V
< V
The
– V
OUT
OUT
– V
– V
= 3mA, I
= 5mA, I
– V
– V
– V
– V
– V
EE
l
OUT
OUT
EE
EE
< AGND – 29V
= 0 – 10V
< AGND – 10V
EE
EE
EE
EE
EE
denotes the specifications which apply over the full operating
, rdis Bit = 0
, rdis Bit = 1 (Note 12)
,
, hpen = 0Fh, limn = 80h
OUT
= 0V (Note 12)
= 0V (Note 12)
– V
INT
INT
LIM
< AGND – 29V
= 3mA
= 5mA
, rdis Bit = 0
LTC4270/LTC4271
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
l
MIN
152
152
102
204
102
102
204
125
2.6
1.3
2.2
89
89
26
49
25
25
70
30.518
5.8250
25.1
TYP
159
159
106
212
106
106
212
200
100
–40
3.8
1.9
0.7
94
94
28
52
12
12
50
50
MAX
2.45
168
168
112
225
115
112
225
255
135
4.9
0.8
0.4
0.7
99
99
30
55
50
50
mV/LSB
Convert
μV/LSB
°C/LSB
UNITS
42701f
5
Bits
ms/
Bits
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
mV
kΩ
kΩ
°C
V
V
V
V