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| 型号： | LTC1646IGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 17/20页 |
| 文件大小： | 407K |
| 描述： | IC CNTRLR HOTSWAP PCIDUAL 16SSOP |
| 标准包装： | 100 |
| 类型： | 热交换控制器 |
| 应用： | CompactPCI? |
| 内部开关： | 无 |
| 电源电压： | 3.3V，5V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 供应商设备封装： | 16-SSOP |
| 包装： | 管件 |
LTC1646
17
1646fa
APPLICATIO S I FOR ATIO
U
U
U
Figure 14. Recommended Layout for
Transient Protection Components
2
3
4
5
6
7
8
VIAS TO
GND PLANE
3V
IN
GND
LTC1646*
ADDITIONAL DETAILS OMITTED FOR CLARITY
RAWING IS NOT TO SCALE!
1646 F14
5V
IN
TZ1
TZ2
C2
C3
Since there is no bulk capacitance to damp the parasitic
trace inductance, supply voltage transients excite para-
sitic resonant circuits formed by the power MOSFET
capacitance and the combined parasitic inductance from
the wiring harness, the backplane and the circuit board
traces. These ringing transients appear as a fast edge on
the 3.3V or 5V supply, exhibiting a peak overshoot to 2.5
times the steady-state value followed by a damped sinu-
soidal response whose duration and period is dependent
on the resonant circuit parameters. Since the absolute
maximum supply voltage of the LTC1646 is 10V, transient
protection against 3.3V and 5V supply voltage 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.
Snubbers are RC networks whose time constants are
large enough to safely damp the inductance of the boards
parasitic resonant circuits. As a starting point, the shunt
capacitors in these networks are chosen to be 10?to 100?/DIV>
the power MOSFETs C
OSS
under bias. The value of the
series resistor (R6 and R7 in Figure 13) is then chosen to
be large enough to damp the resulting series R-L-C circuit
and typically ranges from 1& to 10&. Note that in all
Figure 13. Place Transient Protection Device Close to the LTC1646
C1
0.01礔
C2
0.1礔
C3
0.1礔
3V
IN
V
IN2
3.3V
V
IN1
5V
3V
SENSE
8
3V
OUT
7
5V
IN
12
5V
OUT
5
5V
SENSE
11
9
GATE
10
R3
10&
R4
10&
5V
OUT
AT 5A
3V
OUT
AT 7.6A
R5
1k
R1
0.005&
Q2
IRF7413
Q1
IRF7413
R2
0.007&
Z1
Z2
LTC1646**
1646 F13
GND
6
Z1, Z2: BZX84C6V2
**ADDITIONAL DETAILS OMITTED FOR CLARITY
R6 2.7&
LONG 5V
R7 1.8&
LONG 3.3V
LTC1646 circuit schematics, Zener diodes and snubber
networks have been added to each 3.3V and 5V supply rail
and should be used always. These protection networks
should be mounted very close to the LTC1646s supply
voltage using short lead lengths to minimize lead induc-
tance. This is shown schematically in Figure 13 and a
recommended layout of the transient protection devices
around the LTC1646 is shown in Figure 14.
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| LTC1647-1CS8 | 功能描述:IC CONTROLLR HOTSWAP DUAL 8-SOIC 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 |
| LTC1647-1CS8#PBF | 功能描述:IC CTLR HOTSWAP DUAL 8-SOIC RoHS:是 类别:集成电路 (IC) >> PMIC - 热交换 系列:- 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:119 系列:- 类型:热交换控制器 应用:通用型，PCI Express? 内部开关:无 电流限制:- 电源电压:3.3V，12V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:80-TQFP 供应商设备封装:80-TQFP（12x12） 包装:托盘 产品目录页面:1423 (CN2011-ZH PDF) |
| LTC1647-1CS8#TR | 功能描述:IC CONTROLLER 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 |
| LTC1647-1CS8#TRPBF | 功能描述:IC CONTROLLR HOTSWAP DUAL 8-SOIC 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 |
| LTC1647-1IS8 | 功能描述:IC CONTROLLER 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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