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| 型号： | LTC4244IGN#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 15/28页 |
| 文件大小： | 337K |
| 描述： | IC CTRLR HOTSWAP PCI 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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15
LTC4244/LTC4244-1
42441f
Table 1. t
TIMER
vs C
TIMER
C
TIMER
(?/SPAN>10%)
t
TIMER(MIN)
t
TIMER(MAX)
0.1礔
35ms
74ms
0.22礔
77ms
162ms
0.33礔
115ms
243ms
0.47礔
164ms
346ms
0.68礔
238ms
500ms
0.82礔
287ms
603ms
The TIMER pin is immediately pulled low when the BD_SEL#
pin signal goes high.
Thermal Shutdown
The internal switches for the 12V and 12V supplies are
protected by a thermal shutdown circuit. When the junc-
tion temperature of the die reaches 150癈, all switches will
be latched off and the FAULT pin will be pulled low.
Short-Circuit Protection
During a normal power-up sequence, if the TIMER pin is
done ramping and any supply is still in current limit all of
the pass transistors will be immediately turned off and
FAULT will be pulled low as shown in Figure 4.
In order to prevent excessive power dissipation in the pass
transistors and prevent voltage spikes on the supplies
during short-circuit conditions, the current limit on each
supply is designed to be a function of the output voltage.
As the output voltage drops, the current limit decreases.
Unlike a traditional circuit breaker function where large
currents can flow before the breaker trips, the current
foldback feature guarantees that the supply current will be
kept at a safe level.
If either the 12V or 12V supply exceeds current limit
after power-up, the shorted supplys current will drop
APPLICATIO S I FOR ATIO
U
U
U
TIMER
10V/DIV
GATE
10V/DIV
3.3V
OUT
10V/DIV
BD_SEL#
10V/DIV
HEALTHY#
10V/DIV
FAULT
10V/DIV
LCL_PCI_RST#
10V/DIV
20ms/DIV
4244 F04
12V
OUT
10V/DIV
V
EEOUT
10V/DIV
5V
OUT
10V/DIV
Figure 4. Power-Up Into a Short on a 3.3V Output
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相关代理商/技术参数 |
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| LTC4245 | 制造商:LINER 制造商全称:Linear Technology 功能描述:Dual Supply Hot Swap Controller for Advanced Mezzanine Card |
| LTC4245CG | 制造商:LINER 制造商全称:Linear Technology 功能描述:Multiple Supply Hot Swap Controller with I2C Compatible Monitoring |
| LTC4245CG#PBF | 功能描述:IC CNTRLR HOT SWAP 36-SSOP 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) |
| LTC4245CG#TRPBF | 功能描述:IC CNTRLR HOT SWAP 36-SSOP 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 |
| LTC4245CUHF | 制造商:LINER 制造商全称:Linear Technology 功能描述:Multiple Supply Hot Swap Controller with I2C Compatible Monitoring |
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