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| 型号： | LTC1644IGN#TR |
| 厂商： | Linear Technology |
| 文件页数： | 21/24页 |
| 文件大小： | 447K |
| 描述： | IC CONTROLLER HOT SWAP 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) |
| 其它名称： | LTC1644IGNTR |
LTC1644
21
1644f
APPLICATIO S I FOR ATIO
U
U
U
that in all LTC1644 circuit schematics, zener diodes and
snubber networks have been added to the 12V
IN
and V
EEIN
(12V) supply rail and should be used always. Since the
absolute maximum supply voltage of the LTC1644 is
13.2V, snubber networks are not necessary on the 3V
IN
or
the 5V
IN
supply lines. Zener diodes, however, are recom-
mended as these devices provide large-scale transient
protection for the LTC1644 against PCI backplane fault
occurrences. All protection networks should be mounted
very close to the LTC1644s supply voltage using short
lead lengths to minimize lead inductance. This is shown
schematically in Figures 15 and 16 and a recommended
layout of the transient protection devices around the
LTC1644 is shown in Figure 17.
sinusoidal response whose duration and period is depen-
dent on the resonant circuit parameters. Since the abso-
lute maximum supply voltage of the LTC1644 is 13.2V,
transient protection against 12V
IN
and V
EEIN
supply volt-
age spikes and ringing is highly recommended.
In these applications, there are two methods for eliminat-
ing these supply voltage transients: using Zener diodes to
clip the transient to a safe level and snubber networks.
Snubber networks are series RC networks whose time
constants are experimentally determined based on the
boards parasitic resonant circuits. As a starting point, the
capacitors in these networks are chosen to be 10?to 100?/DIV>
the power MOSFETs C
OSS
under bias. The series resistor
is a value determined experimentally and ranges from 1&
to 50&, depending on the parasitic resonant circuit. Note
Figure 15. Place Transient Protection Devices Close to LTC1644s 5V
IN
and 3V
IN
Pins
C1
0.047礔
3V
IN
3V
IN
3.3V
5V
IN
5V
3V
SENSE
17
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
IRF7413
Q2
IRF7413
R2
0.007&
Z3
Z4
LTC1644*
1644 F15
GND
8
Z3, Z4: 1PMT5.0AT3
*ADDITIONAL DETAILS OMITTED FOR CLARITY
Figure 16. Place Transient Protection Devices
Close to LTC1644s 12V
IN
and V
EEIN
Pins
Figure 17. Recommended Layout for Transient Protection Components
12V
IN
1
V
EEIN
12V
IN
12V
IN
2
Z1
Z2
R16
1&
C5
0.01礔
LTC1644*
1644 F16
GND
8
Z1, Z2: SMAJ12CA
*ADDITIONAL DETAILS OMITTED FOR CLARITY
R15
1&
C4
0.01礔
2
3
4
5
6
7
8
9
VIAS TO
GND PLANE
C4
R13
GND
5V
IN
LTC1644*
*ADDITIONAL DETAILS OMITTED FOR CLARITY
DRAWING IS NOT TO SCALE!
1644 F17
3V
IN
V
EEIN
12V
IN
Z1
Z2
Z3
Z4
C5
R14
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| LTC1645CS#TRPBF | 功能描述:IC CTRLR SEQ HOTSWAP DUAL 14SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
| LTC1645CS8 | 功能描述:IC CTRLR SEQ HOTSWAP DUAL 8SOIC RoHS:否 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Obsolescence Mitigation Program 标准包装:100 系列:- 类型:热插拔开关 应用:通用 内部开关:是 电流限制:可调 电源电压:9 V ~ 13.2 V 工作温度:-40°C ~ 150°C 安装类型:表面贴装 封装/外壳:10-WFDFN 裸露焊盘 供应商设备封装:10-TDFN-EP（3x3） 包装:管件 |
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