參數(shù)資料
型號(hào)： LTC4274CIUHF#PBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： POWER SUPPLY MANAGEMENT CKT, PQCC38
封裝： 7 X 5 MM, LEAD FREE, PLASTIC, MO-220WHKD, QFN-38
文件頁(yè)數(shù)： 22/28頁(yè)
文件大?。?/td> 313K
代理商： LTC4274CIUHF#PBF
LTC4274A/LTC4274C
3
4274acf
electricAl chArActeristics
SYMBOL
PARAMETER
CONDITIONS
MIN
TYP
MAX
UNITS
VEE
Main PoE Supply Voltage
AGND – VEE
For IEEE Type 1 Compliant Output
For IEEE Type 2 Compliant Output
For LTPoE++ Compliant Output
l
45
51
54.75
57
V
Undervoltage Lockout
AGND – VEE
l
20
25
30
V
VDD
VDD Supply Voltage
VDD – DGND
l
3.0
3.3
4.3
V
Undervoltage Lockout
l
2.2
V
Allowable Digital Ground Offset
DGND – VEE
l
25
57
V
IEE
VEE Supply Current
(AGND – VEE) = 55V
l
–2.4
–5
mA
IDD
VDD Supply Current
(VDD – DGND) = 3.3V
l
1.1
3
mA
Detection
Detection Current – Force Current
First Point, AGND – VOUT = 9V
Second Point, AGND – VOUT = 3.5V
l
220
140
240
160
260
180
A
Detection Voltage – Force Voltage
AGND – VOUT, 5A ≤ IOUT ≤ 500A
First Point
Second Point
l
7
3
8
4
9
5
V
Detection Current Compliance
AGND – VOUT = 0V
l
0.8
0.9
mA
VOC
Detection Voltage Compliance
AGND – VOUT, Open Port
l
10.4
12
V
Detection Voltage Slew Rate
AGND – VOUT, CPORT = 0.15F
l
0.01
V/s
Minimum Valid Signature Resistance
l
15.5
17
18.5
kΩ
Maximum Valid Signature Resistance
l
27.5
29.7
32
kΩ
Classification
VCLASS
Classification Voltage
AGND – VOUT, 0mA ≤ ICLASS ≤ 50mA
l
16.0
20.5
V
Classification Current Compliance
VOUT = AGND
l
53
61
67
mA
Classification Threshold Current
Class 0 – 1
Class 1 – 2
Class 2 – 3
Class 3 – 4
Class 4 – Overcurrent
l
5.5
13.5
21.5
31.5
45.2
6.5
14.5
23
33
48
7.5
15.5
24.5
34.9
50.8
mA
VMARK
Classification Mark State Voltage
AGND – VOUT, 0.1mA ≤ ICLASS ≤ 10mA
l
7.5
9
10
V
Mark State Current Compliance
VOUT = AGND
l
53
61
67
mA
Gate Driver
GATE Pin Pull-Down Current
Port Off, VGATE = VEE + 5V
Port Off, VGATE = VEE + 1V
l
0.4
0.08
0.12
mA
GATE Pin Fast Pull-Down Current
VGATE = VEE + 5V
30
mA
GATE Pin On Voltage
VGATE – VEE, IGATE = 1A
l
8
14
V
Output Voltage Sense
VPG
Power Good Threshold Voltage
VOUT – VEE
l
2
2.4
2.8
V
OUT Pin Pull-Up Resistance to AGND
0V ≤ (AGND – VOUT) ≤ 5V
l
300
500
700
kΩ
The l denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at TA = 25°C. AGND – VEE = 54V, AGND = DGND, and VDD – DGND = 3.3V
unless otherwise noted. (Notes 3, 4)
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