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| 型号： | LTC4244IGN-1#TR |
| 厂商： | Linear Technology |
| 文件页数： | 21/28页 |
| 文件大小： | 337K |
| 描述： | IC CTRLR HOT SWAP CPCI 20-SSOP |
| 标准包装： | 2,500 |
| 类型： | 热交换控制器 |
| 应用： | CompactPCI? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，5V，±12V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 20-SSOP |
| 包装： | 带卷 (TR) |
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21
LTC4244/LTC4244-1
42441f
are experimentally determined based on the boards para-
sitic resonance circuits. As a starting point, the capacitors
in these networks are chosen to be 10?to 100?the power
MOSFETs C
OSS
under bias. The series resistor is a value
determined experimentally that ranges from 1& to 50&,
depending on the parasitic resonance circuit. Note that in
all LTC4244 circuit schematics, both transient voltage
limiters and snubber networks have been added to the
12V
IN
and V
EEIN
supply rails and should always be used.
Snubber networks are not necessary on the 3.3V
IN
or the
5V
IN
supply lines since their absolute maximum voltage
ratings are 13.5V. Transient voltage limiters, however, are
recommended as these devices provide large-scale tran-
sient protection for the LTC4244 in the event of abrupt
changes in supply current. All protection networks should
be mounted very close to the LTC4244s supply pins using
short lead lengths to minimize trace resistance and induc-
tance. This is shown schematically in Figures 12 and 13
and a recommended layout of the transient protection
devices around the LTC4244 is shown in Figure 14.
APPLICATIO S I FOR ATIO
U
U
U
C1
0.047礔
3.3V
IN
3V
IN
3.3V
5V
IN
5V
3.3V
SENSE
17
3.3V
OUT
18
5V
IN
13
5V
OUT
3
5V
SENSE
14
16
GATE
15
R3
10&
R4
10&
5V
OUT
5V
3V
OUT
3.3V
R5
1k
R1
0.005&
Q1
IRF7457
Q2
IRF7457
R2
0.007&
Z3
Z4
LTC4244*
4244 F12
GND
8
Z3, Z4: SMAJ5.0A
*ADDITIONAL DETAILS OMITTED FOR CLARITY
Figure 12. Place Transient Protection Devices Close to LTC4244s 5V
IN
and 3.3V
IN
Pins
12V
IN
1
V
EEIN
12V
IN
12V
IN
2
Z1
Z2
R14
10&
C5
0.1礔
LTC4244*
4244 F16
GND
8
Z1, Z2: SMAJ12CA
*ADDITIONAL DETAILS OMITTED FOR CLARITY
R13
10&
C4
0.1礔
2
3
4
5
6
7
8
9
VIAS TO
GND PLANE
C4
R13
GND
5V
IN
LTC4244*
*ADDITIONAL DETAILS OMITTED FOR CLARITY
DRAWING IS NOT TO SCALE!
4244 F14
3.3V
IN
V
EEIN
12V
IN
C5
R14
Z4
Z1
Z1
Z3
Figure 13. Place Transient Protection Devices
Close to LTC4244s 12V
IN
and V
EEIN
Pins
Figure 14. Recommended Layout for Transient Protection
Components
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| LTC4244IGNTR | 制造商:Linear Technology 功能描述: |
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