ltc4259a Linear Technology Corporation, ltc4259a Datasheet - Page 3

• Manufacturer Part Number: ltc4259a
• Description: Quad Ieee 802.3af Power Over Ethernet Controller With Ac Disconnect
• Manufacturer: Linear Technology Corporation

temperature range, otherwise specifications are at T
(Note 6).
SYMBOL
I
Gate Driver
I
I
I
∆V
Output Voltage Sense
V
I
Current Sense
V
V
V
V
I
AC Disconnect (Note 10)
R
A
I
I
Digital Interface
V
V
V
R
R
AC Characteristics
t
t
t
t
t
ELECTRICAL CHARACTERISTICS
TCLASS
GON
GOFF
GPD
VOUT
SENSE
ACDMAX
ACDMIN
DETDLY
DET
CLSDLY
CLASS
PON
PG
CUT
LIM
MIN
SC
VACD
OLD
ILD
IHD
OSCIN
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
Input Impedance of OSCIN Pin
Voltage Gain OSCIN to DETECT1, 2
Voltage Gain OSCIN to DETECT3, 4
AC Disconnect DETECT n Output Current
Remain Connected DETECT Pin 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
0.1V < V
Port Powered, PD Not Present
Port Powered, PD Not Present
Port Powered, –6V < V
Port Powered, V
I
I
SCL, SDAIN, RESET, SHDN n , AUTO, AD n
SCL, SDAIN, RESET, SHDN n , AUTO, AD n
AD n , 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 Mode (Figure 2)
(Figure 2)
From Valid Detect to Port On in Auto Mode (Figure 2)
From Port On Command to GATE Pin Current = I
(Note 10)
GATE n
SDAOUT
SDAOUT
GATE n
OUT n
OUT n
SENSE n
SENSE n
SENSE n
SENSE n
SENSE n
SENSE n
A
– V
= –48V
= – 1µA (Note 3)
OUT n
= 25°C. AGND = DGND = 0V, V
= V
= 3mA, I
= 5mA, I
– V
– V
– V
– V
– V
= V
OSCIN
OUT n
EE
GATE n
GATE n
EE
> –10V
EE
EE
EE
EE
EE
EE
The
+ 2V
, V
, V
, V
, V
> –30V
< 3V, f
DETECT n
OUT n
OUT n
OUT n
OUT n
= V
= V
INT
INT
●
denotes the specifications which apply over the full operating
EE
EE
= 3mA
= 5mA
OSCIN
= V
= V
= AGND – 30V
= AGND – 10V
+ 5V
DETECT n
= –3.4V
EE
EE
< 200Hz
(Note 9)
< 0V
DD
= 3.3V, V
GON
EE
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
●
= –48V unless otherwise noted
30.2
2.52
–2.7
10.1
10.1
10.1
MIN
–20
166
201
201
200
150
170
170
5.5
2.4
13
21
31
45
30
10
2.7
1
187.5
212.5
14.5
3.75
LTC4259A
TYP
–50
–20
–50
100
275
500
200
6.5
50
23
33
48
50
13
–3
50
2
3
MAX
±600
4.97
–3.3
–70
–18
199
224
224
260
590
230
420
130
7.5
0.4
0.7
0.8
–6
16
25
35
51
95
15
52
13
3.3
3
1
UNITS
4259afb
3
V/V
V/V
mA
mA
mA
mA
mA
mA
mV
mV
mV
mV
mV
mV
ms
ms
ms
ms
ms
ms
ms
kΩ
kΩ
kΩ
µA
µA
µA
µA
µA
µA
µA
µA
V
V
V
V
V
V