LTC4258 LINER [Linear Technology], LTC4258 Datasheet - Page 3

• Manufacturer Part Number: LTC4258
• Description: Quad IEEE 802.3af Power over Ethernet Controller with Integrated Detection
• Manufacturer: LINER [Linear Technology]

temperature range, otherwise specifications are at T
(Note 5).
SYMBOL
I
Gate Driver
I
I
I
Output Voltage Sense
V
I
Current Sense
V
V
V
V
I
Digital Interface
V
V
V
R
R
AC Characteristics
t
t
t
t
t
ELECTRICAL CHARACTERISTICS
TCLASS
GON
GOFF
GPD
VOUT
SENSE
DETDLY
DET
CLSDLY
CLASS
PON
PG
CUT
LIM
MIN
SC
OLD
ILD
IHD
V
PU
PD
GATE
PARAMETER
Classification Threshold Current
GATE Pin Current
GATE Pin Current
GATE Pin Short-Circuit Pull-Down
External Gate Voltage (V
Power Good Threshold Voltage
Out Pin Bias Current
Overcurrent Detection Sense Voltage
Current Limit Sense Voltage
DC Disconnect Sense Voltage
Short-Circuit Sense Voltage
SENSE Pin Bias Current
Digital Output Low Voltage
Digital Input Low Voltage
Digital Input High Voltage
Pull-Up Resistor to V
Pull-Down Resistor to DGND
Detection Delay
Detection Duration
Classification Delay
Classification Duration
Power On Delay, Auto Mode
DD
GATE n
– V
EE
)
CONDITIONS
Class 0-1
Class 1-2
Class 2-3
Class 3-4
Class 4-Overcurrent
Gate On, V
Gate Off, V
V
I
V
0V > V
–10V > V
V
V
V
V
V
V
V
I
I
SCL, SDAIN, RESET, SHDN n , AUTO
SCL, SDAIN, RESET, SHDN n , AUTO
AD0 to AD3, RESET, SHDN n
AUTO
From Detect Command or Application of PD to Port
to Detect Complete
Time to Measure PD Signature Resistance (Figure 2)
From Successful Detect in Auto or Semiauto Mode
to Class Complete
From Classify Command in Manual
(Figure 2)
From Valid Detect to Port On in Auto Mode (Figure 2)
From Port On Command to GATE Pin Current = I
(Note 8)
GATE
SDAOUT
SDAOUT
GATE n
OUT n
OUT
SENSE n
SENSE n
SENSE n
SENSE n
SENSE n
SENSE n
A
= –48V
= – 1 A (Note 3)
– V
OUT
= 25 C. AGND = DGND = 0V, V
= V
= 3mA, I
= 5mA, I
– V
– V
– V
– V
= V
– V
OUT
EE
GATE n
GATE n
EE
> –10V
EE
EE
EE
EE
EE
EE
The
> –30V
+ 5V
, V
, V
, V
, V
OUT
OUT
OUT
OUT
= V
= V
INT
INT
denotes the specifications which apply over the full operating
EE
EE
= 3mA
= 5mA
= V
= V
= AGND – 30V
= AGND – 10V
+ 5V
EE
EE
(Note 7)
DD
= 3.3V, V
GON
EE
= –48V unless otherwise noted
30.2
2.52
10.1
10.1
10.1
MIN
–20
166
201
201
170
170
5.5
2.4
13
21
31
45
30
10
1
187.5
212.5
14.5
3.75
TYP
–50
–20
–50
100
275
6.5
23
33
48
50
13
50
50
2
LTC4258
MAX
4.97
–70
–18
199
224
224
590
230
420
7.5
0.4
0.7
0.8
–6
16
25
35
51
95
15
52
13
90
3
1
UNITS
4258p
3
mA
mA
mA
mA
mA
mA
mV
mV
mV
mV
mV
mV
ms
ms
ms
ms
ms
ms
ms
k
k
A
A
V
V
A
A
A
A
V
V
V
V