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LTC4258CGW Datasheet(PDF) 3 Page - Linear Technology

Part # LTC4258CGW
Description  Quad IEEE 802.3af Power over Ethernet Controller with Integrated Detection
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

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LTC4258
3
4258p
ELECTRICAL CHARACTERISTICS The q denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. AGND = DGND = 0V, VDD = 3.3V, VEE = –48V unless otherwise noted
(Note 5).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
ITCLASS
Classification Threshold Current
Class 0-1
q
5.5
6.5
7.5
mA
Class 1-2
q
13
14.5
16
mA
Class 2-3
q
21
23
25
mA
Class 3-4
q
31
33
35
mA
Class 4-Overcurrent
q
45
48
51
mA
Gate Driver
IGON
GATE Pin Current
Gate On, VGATEn = VEE
q
–20
–50
–70
µA
IGOFF
GATE Pin Current
Gate Off, VGATEn = VEE + 5V
q
30
50
95
µA
IGPD
GATE Pin Short-Circuit Pull-Down
VGATEn = VEE + 5V
100
mA
∆VGATE
External Gate Voltage (VGATEn – VEE)IGATE = – 1µA (Note 3)
q
10
13
15
V
Output Voltage Sense
VPG
Power Good Threshold Voltage
VOUTn – VEE
q
123
V
IVOUT
Out Pin Bias Current
0V > VOUT > –10V
q
–6
µA
–10V > VOUT > –30V
q
–18
µA
VOUT = –48V
–20
µA
Current Sense
VCUT
Overcurrent Detection Sense Voltage
VSENSEn – VEE, VOUT = VEE (Note 7)
166
187.5
199
mV
VLIM
Current Limit Sense Voltage
VSENSEn – VEE, VOUT = VEE
201
212.5
224
mV
VSENSEn – VEE, VOUT = AGND – 30V
201
224
mV
VSENSEn – VEE, VOUT = AGND – 10V
30.2
mV
VMIN
DC Disconnect Sense Voltage
VSENSEn – VEE
2.52
3.75
4.97
mV
VSC
Short-Circuit Sense Voltage
275
mV
ISENSE
SENSE Pin Bias Current
VSENSEn = VEE
–50
µA
Digital Interface
VOLD
Digital Output Low Voltage
ISDAOUT = 3mA, IINT = 3mA
q
0.4
V
ISDAOUT = 5mA, IINT = 5mA
q
0.7
V
VILD
Digital Input Low Voltage
SCL, SDAIN, RESET, SHDN
n, AUTO
q
0.8
V
VIHD
Digital Input High Voltage
SCL, SDAIN, RESET, SHDN
n, AUTO
q
2.4
V
RPU
Pull-Up Resistor to VDD
AD0 to AD3, RESET, SHDN
n
50
k
RPD
Pull-Down Resistor to DGND
AUTO
50
k
AC Characteristics
tDETDLY
Detection Delay
From Detect Command or Application of PD to Port
q
170
590
ms
to Detect Complete
tDET
Detection Duration
Time to Measure PD Signature Resistance (Figure 2)
q
170
230
ms
tCLSDLY
Classification Delay
From Successful Detect in Auto or Semiauto Mode
q
10.1
52
ms
to Class Complete
From Classify Command in Manual
q
10.1
420
ms
tCLASS
Classification Duration
(Figure 2)
q
10.1
13
ms
tPON
Power On Delay, Auto Mode
From Valid Detect to Port On in Auto Mode (Figure 2)
q
90
ms
From Port On Command to GATE Pin Current = IGON
q
1ms
(Note 8)


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