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(kāi)以太網(wǎng)控制器
文件頁(yè)數(shù)： 3/32頁(yè)
文件大?。?/td> 326K
代理商： LTC4259A
LTC4259A
3
4259Af
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).
SYMBOL
PARAMETER
CONDITIONS
Gate Driver
I
GON
GATE Pin Current
Gate On, V
GATEn
= V
EE
I
GOFF
GATE Pin Current
Gate Off, V
GATEn
= V
EE
+ 5V
I
GPD
GATE Pin Short-Circuit Pull-Down
V
GATEn
= V
EE
+ 5V
V
GATE
External Gate Voltage (V
GATEn
– V
EE
)
I
GATE
= –1
μ
A (Note 3)
Output Voltage Sense
V
PG
Power Good Threshold Voltage
V
OUTn
– V
EE
I
VOUT
Out Pin Bias Current
0V > V
OUT
> –10V
–10V > V
OUT
> –30V
V
OUT
= –48V
Current Sense
V
CUT
Overcurrent Detection Sense Voltage
V
SENSEn
– V
EE
, V
OUT
= V
EE
(Note 9)
V
LIM
Current Limit Sense Voltage
V
SENSEn
– V
EE
, V
OUT
= V
EE
V
SENSEn
– V
EE
, V
OUT
= AGND – 30V
V
SENSEn
– V
EE
, V
OUT
= AGND – 10V
V
MIN
DC Disconnect Sense Voltage
V
SENSEn
– V
EE
V
SC
Short-Circuit Sense Voltage
I
SENSE
SENSE Pin Bias Current
V
SENSEn
= V
EE
AC Disconnect (Note 10)
R
OSCIN
Input Impedance of OSCIN Pin
0.1V < V
OSCIN
< 3V, f
SINEIN
< 200Hz
A
VACD
Voltage Gain OSCIN to DETECT1, 2
Port Powered, PD Not Present
Voltage Gain OSCIN to DETECT3, 4
Port Powered, PD Not Present
I
ACDMAX
AC Disconnect DETECTnOutput Current
Port Powered, –6V < V
DETECTn
< 0V
I
ACDMIN
Remain Connected DETECT Pin Current
Port Powered, V
DETECTn
= –3.4V
Digital Interface
V
OLD
Digital Output Low Voltage
I
SDAOUT
= 3mA, I
INT
= 3mA
I
SDAOUT
= 5mA, I
INT
= 5mA
V
ILD
Digital Input Low Voltage
SCL, SDAIN, RESET, SHDNn AUTO
V
IHD
Digital Input High Voltage
SCL, SDAIN, RESET, SHDNn AUTO
R
PU
Pull-Up Resistor to V
DD
AD0 to AD3, RESET, SHDNn
R
PD
Pull-Down Resistor to DGND
AUTO
AC Characteristics
t
DETDLY
Detection Delay
From Detect Command or Application of PD to Port
to Detect Complete
t
DET
Detection Duration
Time to Measure PD Signature Resistance (Figure 2)
t
CLSDLY
Classification Delay
From Successful Detect in Auto or Semiauto Mode
to Class Complete
From Classify Command in Manual
t
CLASS
Classification Duration
(Figure 2)
t
PON
Power On Delay, Auto Mode
From Valid Detect to Port On in Auto Mode (Figure 2)
From Port On Command to GATE Pin Current = I
GON
(Note 10)
t
START
Maximum Current Limit Duration During
t
START1
= 0, t
START0
= 0 (Figure 3)
Port Start-Up
t
START1
= 0, t
START0
= 1
t
START1
= 1, t
START0
= 0
t
START1
= 1, t
START0
= 1
The
G
denotes the specifications which apply over the full operating
MIN
TYP
MAX
UNITS
G
–20
30
–50
50
100
13
–70
95
μ
A
μ
A
mA
G
G
10
15
V
G
1
2
3
V
G
G
–6
–18
μ
A
μ
A
μ
A
–20
166
201
201
30.2
2.52
187.5
212.5
199
224
224
mV
mV
mV
mV
mV
mV
μ
A
3.75
275
–50
4.97
G
200
–2.7
2.7
500
–3
3
k
V/V
V/V
μ
A
μ
A
G
G
–3.3
3.3
±
600
260
G
G
150
200
G
G
0.4
0.7
0.8
V
V
V
V
G
G
2.4
50
50
k
k
G
170
590
ms
G
170
10.1
230
52
ms
ms
G
G
10.1
10.1
420
13
90
1
ms
ms
ms
ms
G
G
G
G
G
G
G
50
25
100
200
60
30
120
240
70
35
140
280
ms
ms
ms
ms
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