參數(shù)資料
型號(hào)： LTC4259AIGW-1#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類(lèi)： 電源管理
英文描述： Quad IEEE 802.3af Power over Ethernet Controller with AC Disconnect; Package: SSOP; No of Pins: 36; Temperature Range: -40°C to +85°C
中文描述： 4-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO36
封裝： 0.300 INCH, LEAD FREE, PLASTIC, SSOP-36
文件頁(yè)數(shù)： 27/32頁(yè)
文件大?。?/td> 416K
代理商： LTC4259AIGW-1#TRPBF
LTC4259A-1
4
4259a1fa
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.
Note 7: The LTC4259A-1 is designed to maintain a port voltage of –46.6V
to –57V. The VEE supply voltage range accounts for the drop across the
diode, MOSFET and sense resistor.
Note 8: VEE supply current, while classifying a short, is measured
indirectly by measuring the DETECT
n pin current while classifying a short.
Note 9: The LTC4259A-1 implements overload current detection per IEEE
802.3af. The minimum overload current (ICUT) is dependent on port
voltage; ICUT_MIN = 15.4W/VPORT_MIN. An IEEE compliant system using the
LTC4259A-1 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 VILD and VIHD.
Note 13: If fault occurs during an I2C transaction, the INT pin will not be
pulled down until a stop condition is present on the I2C bus.
ELECTRICAL CHARACTERISTICS The ● 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 6).
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
tSTART
Maximum Current Limit Duration During
tSTART1 = 0, tSTART0 = 0 (Figure 3)
●
50
60
70
ms
Port Start-Up
tSTART1 = 0, tSTART0 = 1 (Figure 3)
●
25
30
35
ms
tSTART1 = 1, tSTART0 = 0 (Figure 3)
●
100
120
140
ms
tSTART1 = 1, tSTART0 = 1 (Figure 3)
●
200
240
280
ms
tICUT
Maximum Current Limit Duration After
tICUT1 = 0, tICUT0 = 0 (Figure 3)
●
50
60
70
ms
Port Start-Up
tICUT1 = 0, tICUT0 = 1 (Figure 3)
●
25
30
35
ms
tICUT1 = 1, tICUT0 = 0 (Figure 3)
●
100
120
140
ms
tICUT1 = 1, tICUT0 = 1 (Figure 3)
●
200
240
280
ms
DCCLMAX
Maximum Current Limit Duty Cycle
Reg16h = 00h
●
5.8
6.3
6.7
%
tDIS
Disconnect Delay
tDIS1 = 0, tDIS0 = 0 (Figures 4, 5)
●
300
360
400
ms
tDIS1 = 0, tDIS0 = 1 (Figures 4, 5)
●
75
90
100
ms
tDIS1 = 1, tDIS0 = 0 (Figures 4, 5)
●
150
180
200
ms
tDIS1 = 1, tDIS0 = 1 (Figures 4, 5)
●
600
720
800
ms
tVMIN
DC Disconnect Minimum Pulse
VSENSEn – VEE > 5mV, VOUTn = –48V (Figure 4)
●
0.02
1
ms
Width Sensitivity
(Note 11)
I2C Timing
fSCLK
Clock Frequency
(Note 11)
●
400
kHz
t1
Bus Free Time
Figure 6 (Notes 11, 12)
●
1.3
s
t2
Start Hold Time
Figure 6 (Notes 11, 12)
●
600
ns
t3
SCL Low Time
Figure 6 (Notes 11, 12)
●
1.3
s
t4
SCL High Time
Figure 6 (Notes 11, 12)
●
600
ns
t5
Data Hold Time
Figure 6 (Notes 11, 12)
●
150
ns
t6
Data Set-Up Time
Figure 6 (Notes 11, 12)
●
200
ns
t7
Start Set-Up Time
Figure 6 (Notes 11, 12)
●
600
ns
t8
Stop Set-Up Time
Figure 6 (Notes 11, 12)
●
600
ns
tr
SCL, SDAIN Rise Time
Figure 6 (Notes 11, 12)
●
20
300
ns
tf
SCL, SDAIN Fall Time
Figure 6 (Notes 11, 12)
●
20
150
ns
tFLTINT
Fault Present to INT Pin Low
(Notes 11, 12, 13)
●
20
150
ns
tSTOPINT
Stop Condition to INT Pin Low
(Notes 11, 12, 13)
●
60
200
ns
tARAINT
ARA to INT Pin High Time
(Notes 11, 12)
●
20
300
ns
Note 1: Stresses beyond those listed under Absolute Maximum Ratings may
cause permanent damage to the device. Exposure to any Absolute Maximum
Rating condition for extended periods may affect device reliability and
lifetime.
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
VEE. 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 CDET (Figure 18). The LTC4259A-1 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-1 will keep the voltage at the DETECT
n pin within the absolute
maximum voltage range. A properly sized RDET 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.
相關(guān)PDF資料
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