LTC4274
4
4274fd
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Current Sense
V
CUT
Overcurrent Sense Voltage
V
SENSE
V
EE
, icut1 = hpen = 00h
hpen = 01h, cut[5:0] e 4 (Note 12)
cutrng = 0
cutrng = 1
l
l
l
180
9
4.5
188
9.38
4.69
196
9.75
4.88
mV
mV/LSB
mV/LSB
Overcurrent Sense in AUTO Pin Mode
Class 0, Class 3
Class 1
Class 2
Class 4
l
l
l
l
90
26
49
152
94
28
52
159
98
30
55
166
mV
mV
mV
mV
V
LIM
Active Current Limit in 802.3af Compliant
Mode
V
SENSE
V
EE
, dblpwr = hpen = 00h
V
EE
= 55V (Note 12)
V
EE
< V
OUT
< A
GND
29V
A
GND
V
OUT
= 0V
l
l
204
40
212
220
100
mV
mV
V
LIM
Active Current Limit in High Power Mode
hpen = 01h, lim1 = C0h, V
EE
= 55V
V
OUT
V
EE
= 0V to 10V
V
EE
+ 23V < V
OUT
< AGND 29V
AGND V
OUT
= 0V
l
l
l
204
100
20
212
106
221
113
50
mV
mV
mV
V
LIM
Active Current Limit in AUTO Pin Mode
V
OUT
V
EE
= 0V to 10V, V
EE
= 55V
Class 0 to Class 3
Class 4
l
l
102
204
106
212
110
221
mV
mV
V
MIN
DC Disconnect Sense Voltage
V
SENSE
V
EE
, rdis = 0
V
SENSE
V
EE
, rdis = 1
l
l
2.6
1.3
3.8
1.9
4.8
2.41
mV
mV
V
SC
Short-Circuit Sense
V
SENSE
V
EE
V
LIM
, rdis = 0
V
SENSE
V
EE
V
LIM
, rdis = 1
l
l
160
75
200
100
255
135
mV
mV
Port Current ReadBack
Resolution
No missing codes, fast_iv = 0
14
bits
LSB Weight
V
SENSE
V
EE
30.5
糣/LSB
50-60Hz Noise Rejection
(Note 7)
30
dB
Port Voltage ReadBack
Resolution
No missing codes, fast_iv = 0
14
bits
LSB Weight
AGND V
OUT
5.835
mV/LSB
50-60Hz noise rejection
(Note 7)
30
dB
Digital Interface
V
ILD
Digital Input Low Voltage
ADn, SHDN, RESET, MSD, AUTO, MID
(Note 6)
l
0.8
V
I
2
C Input Low Voltage
SCL, SDAIN (Note 6)
l
0.8
V
V
IHD
Digital Input High Voltage
(Note 6)
l
2.2
V
Digital Output Low Voltage
I
SDAOUT
= 3mA, I
INT
= 3mA
I
SDAOUT
= 5mA, I
INT
= 5mA
l
l
0.4
0.7
V
V
Internal Pull-Up to V
DD
ADn, SHDN, RESET, MSD
50
k?/DIV>
Internal Pull-Down to DGND
AUTO, MID
50
k?/DIV>
ELECTRICAL CHARACTERISTICS
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25癈. AGND V
EE
= 54V, AGND = DGND, and V
DD
DGND = 3.3V unless
otherwise noted. (Notes 3, 4)
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