Datasheet
LTC4290/LTC4271
5
429071fa
For more information www.linear.com/LTC4290
electricAl chArActeristics
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C. AGND – V
EE
= 54V and V
DD
– DGND = 3.3V unless otherwise noted.
(Notes 3 & 4)
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CUT
Overcurrent Sense Voltage V
SENSEn
– V
EE
,
hpen = 0Fh, cutn = D4h
hpen = 0Fh, cutn = E2h (Note 12)
l
l
89
152
94
159
99
168
mV
mV
Overcurrent Sense in AUTO Pin Mode Class 0, Class 3
Class 1
Class 2
Class 4
l
l
l
l
89
26
49
152
94
28
52
159
99
30
55
168
mV
mV
mV
mV
V
LIM
Active Current Limit in 802.3af Compliant Mode V
SENSEn
– V
EE
, hpen = 0Fh, limn = 80h,
(AGND – V
EE
) = 55V
V
EE
< V
OUT
< AGND – 29V
AGND – V
OUT
= 0V (Note 12)
l
l
102
25
106
112
50
mV
mV
Active Current Limit in High Power Mode hpen = 0Fh, limn = C0h,
(AGND – V
EE
) = 55V
V
OUT
– V
EE
= 0 – 10V
V
EE
+ 23V < V
OUT
< AGND – 29V
AGND – V
OUT
= 0V (Note 12)
l
l
l
204
102
25
212
106
225
115
50
mV
mV
mV
Active Current Limit in AUTO Pin Mode V
EE
< V
OUT
< AGND – 10V,
(AGND – V
EE
) = 55V
Class 0 to Class 3
Class 4
l
l
102
204
106
212
112
225
mV
mV
V
MIN
DC Disconnect Sense Voltage V
SENSE
– V
EE
, rdis Bit = 0
V
SENSE
– V
EE
, rdis Bit = 1 (Note 12)
l
l
2.6
1.3
3.8
1.9
4.9
2.45
mV
mV
V
SC
Short-Circuit Sense V
SENSEn
– V
EE
– V
LIM
(Note 12)
rdis Bit = 0
rdis Bit = 1
l
l
125
70
200
100
255
125
mV
mV
Port Current Readback
Resolution No Missing Codes, Reported as 14 Bits 12 Bits
LSB Weight V
SENSEn
– V
EE
30.518 µV/LSB
Conversion Period 25.1 ms/
Convert
Port Voltage Readback
Resolution No Missing Codes, Reported as 14 Bits 12 Bits
LSB Weight AGND – V
OUTn
5.8350 mV/LSB
Digital Interface
V
ILD
Digital Input Low Voltage ADn, RESET, MSD, GPn, AUTO, MID
(Note 6)
l
0.8 V
I
2
C Input Low Voltage SCL, SDAIN (Note 6)
l
1.0 V
V
IHD
Digital Input High Voltage (Note 6)
l
2.2 V
Digital Output Voltage Low 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, RESET, MSD, GPn 50 kΩ
Internal Pull Down To DGND AUTO, MID 50 kΩ