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参数资料
| 型号： | LTC4225CGN-2#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/24页 |
| 文件大小： | 346K |
| 描述： | IC CTLR HOT SWAP DUAL 24-SSOP |
| 标准包装： | 55 |
| 类型： | 热交换控制器 |
| 应用： | 通用 |
| 内部开关： | 无 |
| 电流限制： | 可调 |
| 电源电压： | 2.9 V ~ 18 V |
| 工作温度： | 0°C ~ 70°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 24-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 24-SSOP |
| 包装： | 管件 |
LTC4225-1/LTC4225-2
10
422512f
applicaTions inForMaTion
High availability systems often employ parallel-connected
power supplies or battery feeds to achieve redundancy
and enhance system reliability. Power ORing diodes are
commonly used to connect these supplies at the point of
load, but at the expense of power loss due to significant
diode forward voltage drop. The LTC4225 minimizes this
power loss by using external N-channel MOSFETs for the
pass elements, allowing for a low voltage drop from the
supply to the load when the MOSFETs are turned on. When
an input source voltage drops below the output common
supply voltage, the appropriate MOSFET is turned off,
thereby matching the function and performance of an ideal
diode. By adding a current sense resistor and configuring
two MOSFETs back-to-back with separate gate control, the
LTC4225 enhances the ideal diode performance with inrush
current limiting and overcurrent protection (see Figure 1).
This allows the boards to be safely inserted and removed
from a live backplane without damaging the connector.
Internal V
CC
Supply
The LTC4225 can operate with input supplies from 2.9V
to 18V at the IN pins. The power supply to the device is
internally regulated at 5V by a low dropout regulator (LDO)
with an output at the INTV
CC
pin. An internal diode-OR
circuit selects the highest of the supplies at the IN and OUT
pins to power the device through the LDO. The diode-OR
scheme permits the devices power to be temporarily kept
alive by the OUT load capacitance when the IN supplies
have collapsed or shut off.
An undervoltage lockout circuit prevents all of the MOSFETs
from turning on until the INTV
CC
voltage exceeds 2.2V . A
0.1礔 capacitor is recommended between the INTV
CC
and
GND pins, close to the device for bypassing. No external
supply should be connected at the INTV
CC
pin so as not
to affect the LDOs operation. A small external load of less
than 500礎 can be connected at the INTV
CC
pin.
Turn-On Sequence
The board power supply at the OUT pin is controlled with
two external back-to-back N-channel MOSFETs (M
D
, M
H
).
The MOSFET M
D
on the supply side functions as an ideal
diode, while M
H
on the load side acts as a Hot Swap con-
trolling the power supplied to the output load. The sense
resistor, R
S
, monitors the load current for overcurrent
detection. The HGATE capacitor, C
HG
, controls the gate
slew rate to limit the inrush current. Resistor R
HG
with C
HG
compensates the current control loop, while R
H
prevents
high frequency oscillations in the Hot Swap MOSFET .
CPO1
ON1
R2
137k
R4
137k
V
IN1
12V
V
IN2
12V
ON2
INTV
CC
GND
C1
0.1礔
C
F1
10nF
C
F2
10nF
C
CP1
0.1礔
C
CP2
0.1礔
C
T2
47nF
C
HG1
15nF
BULK
SUPPLY
BYPASS
CAPACITOR
BULK
SUPPLY
BYPASS
CAPACITOR
C
T1
47nF
12V
7.6A
PLUG-IN
CARD 1
PLUG-IN
CARD 2
BACKPLANE
422512 F01
IN1
SENSE1 DGATE1
M
D1
Si7336ADP
M
H1
Si7336ADP
LTC4225
R
S1
0.004
M
D2
Si7336ADP
M
H2
Si7336ADP
R
S2
0.004
HGATE1
OUT1
CPO2
IN2
SENSE2 DGATE2
HGATE2
OUT2
FAULT1
PWRGD1
EN1
TMR1
TMR2
EN2
PWRGD2
FAULT2
R
H1
10
R
HG1
47
C
HG2
15nF
R
H2
10
R
HG2
47
R5
100k
R6
100k
V
IN1
V
IN2
R7
100k
R8
100k
R1
20k
R3
20k
12V
7.6A
C
L1
1600礔
+
C
L2
1600礔
Figure 1. 礣CA Application Supplying 12V Power to Two 礣CA Slots
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