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| 型号： | LTC4244IGN#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 16/28页 |
| 文件大小： | 337K |
| 描述： | IC CTRLR HOTSWAP PCI 20-SSOP |
| 标准包装： | 55 |
| 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： | 管件 |
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16
LTC4244/LTC4244-1
42441f
immediately to its I
LIMIT
value. If that supply remains in
current limit for more than 25祍, all of the supplies will be
latched off. The 25祍 prevents quick current spikesfor
example, from a fan turning onfrom causing false trips
of the circuit breaker.
After power-up, the 5V and 3.3V supplies are protected
from short circuits by dual-level circuit breakers. In the
event that either supplys current exceeds the nominal
current limit, an internal timer is started. If the supply is
still overcurrent after 25祍, the circuit breaker trips and all
the supplies are turned off (Figure 5). An analog current
limit loop prevents the supply current from exceeding 3?/DIV>
the nominal current limit in the event of a short circuit
(Figure 6). The LTC4244 will stay in the latched off state
until the OFF/ON pin is cycled high then low or the 12V
IN
power supply is cycled low then high.
The current limit and the foldback current level for the 5V
and 3.3V outputs are both a function of the external sense
resistor. As shown in Figure 1, a sense resistor is con-
nected between 5V
IN
and 5V
SENSE
for the 5V supply. For
the 3.3V supply, a sense resistor is connected between
3.3V
IN
and 3.3V
SENSE
. The typical current limit and the
foldback current levels are given by Equations 6 and 7:
I
mV
R
LIMIT VOUT
SENSE VOUT
(
)
(
)
n
n
=
51
(6)
I
mV
R
FOLDBACK VOUT
SENSE VOUT
(
)
(
)
n
n
=
16
(7)
where nV
OUT
= 5V
OUT
or 3.3V
OUT
.
The current limit for the internal 12V switch is set at
850mA folding back to 360mA and the 12V switch at
610mA folding back to 225mA.
APPLICATIO S I FOR ATIO
U
U
U
GATE
20V/DIV
5V
OUT
10V/DIV
FAULT
5V/DIV
TIMER
20V/DIV
5V
IN
5V
SENSE
100mV/DIV
10祍/DIV
4244 F05
Figure 5. Overcurrent Fault on 5V Output
GATE
20V/DIV
3.3V
OUT
5V/DIV
FAULT
5V/DIV
TIMER
20V/DIV
3V
IN
3V
SENSE
500mV/DIV
10祍/DIV
4244 F06
Figure 6. Short-Circuit Fault on 3.3V Output
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LTC4244IGNTR | 制造商:Linear Technology 功能描述: |
| 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 |
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