參數(shù)資料
型號(hào)： LTC4259A
廠商： Linear Technology Corporation
英文描述： Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect
中文描述： 四IEEE 802.3af標(biāo)準(zhǔn)與AC電源斷開以太網(wǎng)控制器
文件頁(yè)數(shù)： 4/32頁(yè)
文件大?。?/td> 326K
代理商： LTC4259A
LTC4259A
4
4259Af
Note 7:
The LTC4259A is designed to maintain a port voltage of –46.6V to
–57V and the V
EE
supply voltage range accounts for the drop across the
diode, MOSFET and sense resistor.
Note 8:
V
EE
supply current, while classifying a short, is measured
indirectly by measuring the DETECTnpin current while classifying a short.
Note 9:
The LTC4259A implements overload current detection per IEEE
802.3af. The minimum overload current (I
CUT
) is dependent on port
voltage; I
CUT_MIN
= 15.4W/V
PORT_MIN
. An IEEE compliant system using the
LTC4259A should maintain port voltage above –46.6V.
Note 10:
Unless otherwise specified, AC disconnect specifications require
the following conditions: the DETECT pin is connected to the port as
shown in Figure 1, a valid sine wave is applied to OSCIN, the OSCFAIL bit
is cleared and the AC Disconnect Enable bits are set.
Note 11:
Guaranteed by design, not subject to test.
Note 12:
Values measured at V
ILD
and V
IHD
.
Note 13:
If fault occurs during an I
2
C transaction, the INT pin will not be
pulled down until a stop condition is present on the I
2
C bus.
Note 1:
Absolute Maximum Ratings are those values beyond which the life
of the device may be impaired.
Note 2:
DGND and AGND should be tied together in normal operation.
Note 3:
An internal clamp limits the GATE pins to a minimum of 12V above
V
EE
. Driving this pin beyond the clamp may damage the part.
Note 4:
When a port powers on or off, the transient voltage on the port
couples through C
DET
(Figure 16). The LTC4259A contains internal
protection circuitry to withstand transient currents of up to 80mA for 5ms.
As long as the absolute value of the current remains below 80mA, the
LTC4259A will keep the voltage at the DETECTnpin within the absolute
maximum voltage range. A properly sized R
DET
should limit the current to
less than 60mA.
Note 5:
This IC includes overtemperature protection that is intended to
protect the device during momentary overload conditions. Junction
temperature will exceed 125
°
C when overtemperature protection is active.
Continuous operation above the specified maximum operating junction
temperature may impair device reliability.
Note 6:
All currents into device pins are positive; all currents out of device
pins are negative. All voltages are referenced to ground (AGND and DGND)
unless otherwise specified.
ELECTRICAL CHARACTERISTICS
temperature range, otherwise specifications are at T
A
= 25
°
C. AGND = DGND = 0V, V
DD
= 3.3V, V
EE
= –48V unless otherwise noted
(Note 6).
The
G
denotes the specifications which apply over the full operating
SYMBOL
t
ICUT
PARAMETER
Maximum Current Limit Duration After
Port Start-Up
CONDITIONS
t
ICUT1
= 0, t
ICUT0
= 0 (Figure 3)
t
ICUT1
= 0, t
ICUT0
= 1
t
ICUT1
= 1, t
ICUT0
= 0
t
ICUT1
= 1, t
ICUT0
= 1
Reg16h = 00h
t
DIS1
= 0, t
DIS0
= 0 (Figures 4, 5)
t
DIS1
= 0, t
DIS0
= 1
t
DIS1
= 1, t
DIS0
= 0
t
DIS1
= 1, t
DIS0
= 1
V
SENSEn
– V
EE
> 5mV, V
OUTn
= –48V (Figure 4)
(Note 11)
MIN
50
25
100
200
5.8
300
75
150
600
TYP
60
30
120
240
6.3
360
90
180
720
0.02
MAX
70
35
140
280
6.7
400
100
200
800
1
UNITS
G
G
G
G
ms
ms
ms
ms
%
ms
ms
ms
ms
ms
DC
CLMAX
t
DIS
Maximum Current Limit Duty Cycle
Disconnect Delay
G
G
G
G
G
t
VMIN
DC Disconnect Minimum Pulse
Width Sensitivity
G
I
2
C Timing
f
SCLK
t
1
t
2
t
3
t
4
t
5
t
6
t
7
t
8
t
r
t
f
t
FLTINT
t
STOPINT
t
ARAINT
Clock Frequency
Bus Free Time
Start Hold Time
SCL Low Time
SCL High Time
Data Hold Time
Data Set-Up Time
Start Set-Up Time
Stop Set-Up Time
SCL, SDAIN Rise Time
SCL, SDAIN Fall Time
Fault Present to INT Pin Low
Stop Condition to INT Pin Low
ARA to INT Pin High Time
(Note 11)
Figure 6 (Notes 11, 12)
Figure 6 (Notes 11, 12)
Figure 6 (Notes 11, 12)
Figure 6 (Notes 11, 12)
Figure 6 (Notes 11, 12)
Figure 6 (Notes 11, 12)
Figure 6 (Notes 11, 12)
Figure 6 (Notes 11, 12)
Figure 6 (Notes 11, 12)
Figure 6 (Notes 11, 12)
(Notes 11, 12, 13)
(Notes 11, 12, 13)
(Notes 11, 12)
G
400
kHz
μ
s
ns
μ
s
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
G
1.3
600
1.3
600
150
200
600
600
20
20
20
60
20
G
G
G
G
G
G
G
G
300
150
150
200
300
G
G
G
G
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