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LTC4266A Datasheet(PDF) 5 Page - Linear Technology

Part # LTC4266A
Description  12-Port PoE/PoE/LTPoE PSE Controller
Download  32 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LTC4266A Datasheet(HTML) 5 Page - Linear Technology

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LTC4270/LTC4271
5
42701fb
electricAl chArActeristics The
l
denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. AGND – VEE = 54V and VDD – DGND = 3.3V unless otherwise noted.
(Notes 3 & 4)
SYMBOL PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
Output Voltage Sense
VPG
Power Good Threshold Voltage
VOUTn – VEE
l
2
2.4
2.8
V
OUT Pin Pull-Up Resistance to
AGND
0V ≤ (AGND – VOUT) ≤ 5V
l
300
500
700
VCUT
Overcurrent Sense Voltage
VSENSEn – VEE,
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
VLIM
Active Current Limit in 802.3af
Compliant Mode
VSENSEn – VEE, hpen = 0Fh, limn = 80h, (AGND–VEE) = 55V
VEE < VOUT < AGND – 29V
AGND – VOUT = 0V (Note 12)
l
l
102
25
106
112
50
mV
mV
Active Current Limit in High Power
Mode
hpen = 0Fh, limn = C0h, AGND–VEE = 55V
VOUT – VEE = 0 – 10V
VEE + 23V < VOUT < AGND – 29V
AGND – VOUT = 0V (Note 12)
l
l
l
204
102
25
212
106
225
115
50
mV
mV
mV
Active Current Limit in AUTO Pin
Mode
VEE < VOUT < AGND – 10V, AGND–VEE = 55V
Class 0 to Class 3
Class 4
l
l
102
204
106
212
112
225
mV
mV
VMIN
DC Disconnect Sense Voltage
VSENSE – VEE, rdis Bit = 0
VSENSE – VEE, rdis Bit = 1 (Note 12)
l
l
2.6
1.3
3.8
1.9
4.9
2.45
mV
mV
VSC
Short-Circuit Sense
VSENSEn – VEE – VLIM (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
VSENSEn – VEE
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
VSENSEn – VEE
5.8350
mV/LSB
Digital Interface
VILD
Digital Input Low Voltage
ADn, RESET, MSD, GPn, AUTO, MID (Note 6)
l
0.8
V
I2C Input Low Voltage
SCL, SDAIN (Note 6)
l
1.0
V
VIHD
Digital Input High Voltage
(Note 6)
l
2.2
V
Digital Output Voltage Low
ISDAOUT = 3mA, IINT = 3mA
ISDAOUT = 5mA, IINT = 5mA
l
l
0.4
0.7
V
V
Internal Pull Up to VDD
ADn, RESET, MSD, GPn
50
Internal Pull Down To DGND
AUTO, MID
50


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